WO1998005078A1 - Light emitting device and display device - Google Patents
Light emitting device and display device Download PDFInfo
- Publication number
- WO1998005078A1 WO1998005078A1 PCT/JP1997/002610 JP9702610W WO9805078A1 WO 1998005078 A1 WO1998005078 A1 WO 1998005078A1 JP 9702610 W JP9702610 W JP 9702610W WO 9805078 A1 WO9805078 A1 WO 9805078A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- phosphor
- light emitting
- emitting element
- emitting diode
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7767—Chalcogenides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
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- G02B6/0073—Light emitting diode [LED]
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- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a light emitting diode used for an LED display, a backlight light source, a traffic light, an illuminated switch, various indicators, and the like, and more particularly, to a light emitting diode which converts a wavelength of light generated by a light emitting element and emits light.
- the present invention relates to a light emitting device and a display device using the same. Background art
- the light-emitting diode is small, efficient and can emit bright color light.Since it is a semiconductor device, there is no need to worry about the ball breaking, and it has excellent initial drive characteristics and earthquake resistance. It has the feature that it is strong. Therefore, it is widely used as various indicators and various light sources. Recently, high-brightness, high-efficiency RGB (red, green, blue) light emitting diodes have been developed, respectively, and large-screen LED displays using these light emitting diodes have been used. Was. This LED display can be operated with low power, has excellent characteristics of light weight and long life, and is expected to be used more and more in the future.
- RGB red, green, blue
- the light-emitting diode has a monochromatic peak wavelength.For example, it is necessary to provide three light-emitting elements R, G, and B in close proximity to emit light and perform diffuse color mixing. is there.
- the desired white color cannot be generated due to variations in the color tone and brightness of the light emitting element.
- the driving power of each light emitting element is different, and it is necessary to apply a predetermined voltage to each light emitting element. .
- the light-emitting elements are semiconductor light-emitting elements, temperature characteristics and time-dependent changes are different from one another, and the color tone changes depending on the usage environment, and the light generated by each light-emitting element cannot be uniformly mixed. There were many problems such as color unevenness. That is, the light-emitting diode is effective as a light-emitting device that emits individual colors, but a satisfactory light source that can generate white light using a light-emitting element has not been obtained.
- the present applicant has proposed a light emitting diode in which light generated by a light emitting element previously is color-converted by a phosphor and output, as disclosed in Japanese Patent Application Laid-Open Nos. 5-152609 and 7-999. It has been disclosed in Japanese Patent Application Laid-Open No. 345, Japanese Patent Application Laid-Open No. 7-176794, Japanese Patent Application Laid-Open No. 8-86614 and the like.
- the light emitting diodes disclosed in these publications can emit other luminescent colors such as white light using one kind of light emitting element, and are configured as follows.
- the light-emitting diode disclosed in the above-mentioned publication includes a light-emitting element having a large energy band gear of a light-emitting layer disposed on a power supply provided at a tip of a lead frame, and The light-emitting device absorbs light from the light-emitting element and emits light having a different wavelength from the absorbed light (wavelength conversion).
- the light emitting diode disclosed above a light emitting element capable of emitting blue light is used as the light emitting element, and the light emitting element is made of a resin containing a phosphor that absorbs the emitted light and emits yellow light.
- the conventional light emitting diode has a problem that the color tone may be shifted due to the deterioration of the phosphor, or the efficiency of extracting the dark light from the phosphor to the outside may decrease.
- the darkening means that, for example, when an inorganic phosphor such as a (Cd, Zn) S phosphor is used, a part of the metal elements constituting the phosphor precipitates or deteriorates.
- an organic phosphor material when an organic phosphor material is used, it is colored by breaking a double bond or the like.
- a semiconductor having a high energy band gap which is a light emitting element, is used to improve the conversion efficiency of the phosphor (that is, the energy of light emitted by the semiconductor increases, and the phosphor can absorb the light).
- the phosphor provided in the vicinity of the light emitting element is also exposed to a high temperature due to a rise in the temperature of the light emitting element or an external environment (for example, due to sunlight when used outdoors), and is degraded by this heat. May be.
- the present invention solves the above-mentioned problems, and achieves higher brightness and longer use. It is an object of the present invention to provide a light emitting device in which the luminous intensity and the luminous efficiency are extremely low and the color shift is extremely small even in a use environment.
- the present inventors have achieved, in order to achieve this object, a light-emitting device including a light-emitting element and a phosphor,
- the light-emitting element must be capable of emitting high-brightness light and have stable light-emitting characteristics over a long period of use.
- the phosphor is provided in close proximity to the above-described high-luminance light-emitting element, and has a light resistance and little characteristic change even when used for a long period of time when exposed to strong light from the light-emitting element. Excellent heat resistance etc. (Especially, according to our study, phosphors placed close to the periphery of light-emitting elements can emit light with an intensity that is about 30 to 40 times that of sunlight. The higher the brightness of the light-emitting element, the more severe the light resistance required of the phosphor becomes.)
- the phosphor efficiently absorbs light having a monochromatic peak wavelength having a spectrum width from the light emitting element and can emit light having different emission wavelengths efficiently. Therefore, the present inventors have completed the present invention as a result of intensive studies.
- the light-emitting device of the present invention includes a light-emitting element in which the light-emitting layer is a semiconductor, and absorbs a part of light emitted by the light-emitting element to emit light having a wavelength different from the wavelength of the absorbed light.
- a light emitting device comprising a photoluminescent phosphor,
- the light emitting layer of the light emitting element is made of a nitride-based compound semiconductor, and the photoluminescent phosphor is at least one element selected from the group consisting of Y, Lu, Sc, La, Gd, and Sm. And at least one element selected from the group consisting of Al, Ga, and In, and is activated with cerium. It is characterized by containing a garnet-based phosphor.
- Y 3 A 1 5 0i2: C e, Gd 3 I n 5 0 12: started C e include the various defined as above.
- the light emitting device of the present invention uses a light emitting element made of a nitride-based compound semiconductor capable of emitting light of high luminance, it can emit light of high luminance.
- the photoluminescent phosphor used is extremely excellent in light resistance with little change in the fluorescence characteristics even when exposed to strong light for a long time. As a result, the characteristic deterioration can be reduced over a long period of use, and not only the strong light from the light emitting element, but also the deterioration due to extraneous light (sunlight including ultraviolet rays) during outdoor use can be reduced. It is possible to provide a light-emitting device in which color shift and luminance decrease are extremely small.
- the light emitting device of the present invention is also used in applications where a relatively fast response speed of, for example, 120 nsec is required because the photoluminescent phosphor used is short afterglow. be able to.
- the photoluminescence phosphor preferably includes a yttrium 'aluminum' ganet-based phosphor containing Y and A1, whereby the luminance of the light-emitting device is reduced. Can be higher.
- the light emitting device of the present invention in order to reduce the temperature dependence of the emission characteristics (such as emission wavelength and luminous intensity), as the follower Toruminesensu phosphor
- the photoluminescent phosphor is preferably composed of two or more cerium-activated yttrium 'aluminum' garnet-based phosphors each containing Y and A1 and having different compositions. Phosphors may be included.
- the emission spectrum of the photoluminescent phosphor can be adjusted in accordance with the characteristics (emission wavelength) of the light emitting element to emit light of a desired emission color.
- the Photo-luminescent phosphors respectively general formula (R e -! R Smr) 3 (A ] i-, G a s ) 5 0 12 : C e (where 0 ⁇ r x 1, 0 ⁇ s ⁇ 1, and R e is at least one selected from Y and Gd.) It is preferable to include two or more different phosphors.
- the the Photo-luminescent phosphor for adjusting the emission wavelength of the general formula Y 3 (A 1, - s G a J 5 0i2: first is table with C e and a phosphor represented by the general formula R e 3 a 1 5 0 12 : may include a second fluorescent body represented by C e.
- 0 ⁇ s ⁇ l and Re are at least selected from Y, Ga and La
- the photoluminescent phosphors are each made of yttrium and aluminum to adjust the emission wavelength.
- a part of yttrium may be substituted with gadolinium, and the first and second phosphors having different substitution amounts from each other may be included.
- the main peak of the light-emitting spectrum of the light-emitting element is set in a range from 400 nm to 530 nm, and the main light-emitting wavelength of the photoluminescent phosphor is set. It is preferable to set so as to be longer than the main peak of the light emitting element. Thereby, white light can be efficiently emitted.
- the absorption spectrum of the photoluminescent phosphor adjusted in this manner matches the wavelength of light emitted from the light-emitting element having a gallium nitride-based semiconductor containing In as the light-emitting layer very well, and the conversion efficiency ( Luminous efficiency).
- light resulting from color mixture of the blue light of the light emitting element and the fluorescent light of the phosphor becomes a high-quality white color with good color rendering properties, and in that respect, an extremely excellent light emitting device can be provided.
- the light-emitting device includes a light-emitting element provided on one side of the light-emitting element via the photoluminescent phosphor, and a surface excluding one main surface thereof is substantially covered with a reflecting member.
- an LED display device of the present invention includes an LED display in which the light emitting device of the present invention is arranged in a matrix, and a drive circuit for driving the LED display according to input display data. This makes it possible to provide a relatively inexpensive LED display device capable of high-definition display and having less color unevenness depending on the viewing angle.
- a light-emitting device includes: a mount / lead having a power portion and a lead portion;
- a light emitting diode having a cup part of the mount lead and a mold member covering the LED chip covered with the coating member, the mold including a connection part between the inner lead and the other electrode of the LED chip;
- the LED chip is a nitride-based compound semiconductor
- the coating member is at least one selected from the group consisting of Y, Lu, Sc, La, Gd, and Sm.
- the photoluminescence phosphor preferably contains a yttrium 'aluminum garnet-based phosphor containing Y and A1.
- examples of follower Bok luminescent phosphor the general formula (R e r S nir!) 3 (A 1 -sG a s! 5 0 12: C e in represented Ru phosphor ( However, 0 ⁇ r ⁇ 1, 0 ⁇ s ⁇ l, and Re are at least one selected from Y and Gd.)
- the light emitting diode as the the Photo-luminescent phosphor, the general formula of the present invention Table (Y Les P - r Gd P C e q Sm r - q) 3 (A 1 Bok S G a s) 5 0 12 (However, 0 ⁇ p 0.8, 0.003 ⁇ q ⁇ 0.2. 0.0003 ⁇ ⁇ 0.08. 0 ⁇ s ⁇ l) A phosphor can also be used.
- the photoluminescent phosphor in order to adjust the light emitting wavelength to a desired wavelength, is activated with two or more ceriums having different compositions from each other, each containing Y and A 1. It is preferable to include a yttrium / aluminum / garnet-based phosphor.
- the Photo-luminescent phosphor in order to adjust the emission wavelength to a desired wavelength, respectively general formula (R e -! R SiTir) 3 (A 1 i-sG as ) 5 0 12 : Expressed as C e (where 0 ⁇ r ⁇ 1, 0 ⁇ s ⁇ 1. Re is at least one selected from Y and Gd.) Two or more with different compositions A phosphor may be used.
- 0 ⁇ s ⁇ l and R e are at least one selected from Y, G a and L a.
- the light emitting wavelength is adjusted to a desired wavelength.
- the photoluminescent phosphors of the yttrium-aluminum-garnet-based phosphors each have a structure in which a part of yttrium is replaced by gadolinium, and the first and second phosphors have different substitution amounts.
- the first phosphor and the second phosphor may be used.
- the light emitting element it is preferable to use an element that emits visible light rather than an element that emits ultraviolet light that deteriorates the resin (mold member ⁇ ⁇ ⁇ ⁇ coating member or the like). Therefore, in the light-emitting diode of the present invention, the main peak of the light-emitting spectrum of the light-emitting element is set to 40%, which is a relatively short wavelength of visible light, in order to improve the light-emitting efficiency and extend the life.
- the wavelength is set in the range of 0 nm to 530 nm, and the main emission wavelength of the photoluminescent phosphor is set longer than the main peak of the light emitting element. Further, by doing so, the light converted by the phosphor has a longer wavelength than the light emitted by the light emitting element, so that the converted light reflected by the phosphor or the like is irradiated to the light emitting element. However, it is not absorbed by the light-emitting element (because the energy of the converted light is smaller than the band gap energy). As described above, the light reflected by the phosphor or the like is reflected by the power supply on which the light emitting element is mounted, and more efficient light emission becomes possible. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic sectional view of a lead-type light emitting diode according to an embodiment of the present invention.
- FIG. 2 is a schematic sectional view of a chip type light emitting diode according to an embodiment of the present invention.
- FIG. 3A is a graph showing the excitation spectrum of the garnet-based phosphor activated with cerium of the first embodiment.
- FIG. 3B is a graph showing the light emission spectrum of the garnet-based phosphor activated with cerium of the first embodiment.
- FIG. 4 is a graph showing a light emitting spectrum of the light emitting diode according to the first embodiment.
- FIG. 5A is a graph showing an excitation spectrum of a yttrium-aluminum-garnet-based phosphor activated with cerium of the second embodiment.
- FIG. 5B is a graph showing the emission spectrum of the yttrium and aluminum garnet-based phosphor activated with cerium of the second embodiment.
- FIG. 6 is a chromaticity diagram for explaining a light emission color of the light emitting diode of the second embodiment.
- points A and B indicate light emission colors of light emitted from the light emitting element
- points C and D are points. The emission colors from two types of photoluminescent phosphors are shown.
- FIG. 7 is a schematic cross-sectional view of a planar light source according to another embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view of a planar light source different from FIG.
- FIG. 9 is a schematic cross-sectional view of a planar light emitting light source different from FIGS.
- FIG. 10 is a block diagram 10 of a display device that is an application example of the present invention.
- FIG. 11 is a plan view of the LED display of the display device of FIG.
- FIG. 12 is a plan view of an LED display in which one picture element is formed by using the light emitting diode of the present invention and four light emitting diodes of RGB.
- FIG. 13A is a graph showing the results of the life test of the light emitting diodes of Example 1 and Comparative Example 1 at 25 ° C.
- FIG. 13B is a graph showing the results of Example 1 and Comparative Example 1. It is a graph showing the results of the life test of the light emitting diode of 6 0. C, results at 90% RH.
- FIG. 14A is a graph showing the results of the weather resistance test of Example 9 and Comparative Example 2, and shows the luminance retention with respect to the elapsed time.
- FIG. 14B is a graph showing the results of the weather resistance test of Example 9 and Comparative Example 2, showing changes in color tone before and after the test.
- FIG. 15A is a graph showing the relationship between the luminance retention and the time in the reliability test of the light emitting diodes of Example 9 and Comparative Example 2
- FIG. 15B is the light emitting of Example 9 and Comparative Example 2.
- 6 is a graph showing the relationship between color tone and time in a diode reliability test.
- Figure 16 is a chromaticity diagram showing the color reproduction range that can be achieved by a light emitting diode that combines the phosphors shown in Table 1 with a blue LED with a peak wavelength of 465 nm.
- FIG. 17 is a chromaticity diagram showing a change in emission color when the content of the phosphor in the light emitting diode in which the phosphor shown in Table 1 is combined with a blue LED having a peak wavelength of 465 nm is changed.
- Figure 18 A is, (YQ 6 G d 4. .) 3 A 1 5 0 12: shows the emission scan Bae-vector of follower Toruminesensu phosphor of Example 2, represented by C e.
- FIG. 18B shows the light emission spectrum of the light emitting device of Example 2 having a light emission peak wavelength of 460 nm.
- FIG. 18C shows the light emission spectrum of the light emitting diode of Example 2.
- Figure 19 A is, (Y 0 2 Gd 0 8 ..) 3 A 1 5 0 12: shows the emission scan Bae-vector of follower Toruminesensu phosphor of Example 5 represented by C e.
- FIG. 19B shows the light emission spectrum of the light emitting device of Example 5 having a light emission peak wavelength of 450 nm.
- FIG. 19C shows the light emission spectrum of the light emitting diode of Example 5.
- Figure 20 A is, Y 3 A 1 5 0 12 : shows the emission scan Bae-vector of follower Toruminese Nsu phosphor of Example 6 represented by C e.
- FIG. 20B shows the light emission spectrum of the light emitting device of Example 6 having a light emission peak wavelength of 450 nm.
- FIG. 20C shows the light emission spectrum of the light emitting diode of Example 6.
- Figure 21 A is, Y 3 (A 1 .. 5 G a .. 5) 5 0 12: shows the emission scan Bae-vector of follower Toruminesensu phosphor of Example 7 represented by C e.
- FIG. 21B shows the light emission spectrum of the light emitting device of Example 7 having a light emission peak wavelength of 450 nm.
- FIG. 21C shows the light emission spectrum of the light emitting diode of Example 7.
- Figure 22 A is, (Y 0 8 Gd 0 2 ..) 3 A 1 5 0 12: shows the emission scan Bae-vector of follower Toruminesensu phosphor of Example 11 represented by C e.
- Figure 22 B is, (Y. 4 Gd .. 6) 3 A 1 5 0 12: shows the emission scan Bae-vector of follower Toruminesensu phosphor of Example 11 represented by C e.
- FIG. 22C shows a light emission spectrum of the light emitting device of Example 11 having a light emission peak wavelength of 470 nm.
- FIG. 23 shows a light emitting spectrum of the light emitting diode of the eleventh embodiment.
- the light emitting diode 100 shown in FIG. 1 is a lead type light emitting diode having a mount lead 105 and an inner lead 106, and a light emitting element 102 is mounted on a power supply 105a of a mount lead 105.
- the resin mold It is composed.
- the n-side electrode and the p-side electrode of the light emitting element 102 are respectively connected to the mount lead 105 and the inner lead 106 using the wire 103.
- the light-emitting diode configured as described above, a part of the light emitted by the light-emitting element (LED chip) 102 (hereinafter, referred to as LED light) is included in the coating resin 101.
- LED light a part of the light emitted by the light-emitting element (LED chip) 102
- the luminescent phosphor By exciting the luminescent phosphor to generate fluorescence having a wavelength different from that of the LED light, the fluorescence generated by the photoluminescent phosphor and the LED light output without contributing to the excitation of the photoluminescent phosphor are generated. It is mixed and output.
- the light emitting diode 100 also outputs light having a different wavelength from the LED light generated by the light emitting element 102.
- FIG. 2 shows a chip-type light-emitting diode in which a light-emitting element (LED chip) 202 is provided in a concave portion of a housing 204 and a predetermined photoluminescent phosphor is provided in the concave portion.
- the coating part 201 is formed by being filled with a coating material containing the coating material.
- the light-emitting element 202 is fixed using, for example, an epoxy resin containing Ag, and the n-side electrode and the p-side electrode of the light-emitting element 202 are respectively attached to the housing 204. It is connected to the provided terminal metal 205 using a conductive wire 203.
- the light emitting diode 200 similarly to the lead-type light-emitting diode in FIG. 1, the fluorescence generated by the photoluminescent phosphor and the light transmitted without being absorbed by the photoluminescent phosphor.
- the LED light thus mixed is output as a result, and as a result, the light emitting diode 200 also outputs light having a different wavelength from the LED light generated by the light emitting element 102.
- the light emitting diode provided with the photoluminescent phosphor described above has the following features. 1. Normally, light emitted from a light emitting element (LED) is emitted through an electrode that supplies power to the light emitting element. The emitted light becomes a shadow of an electrode formed on the light emitting device and has a specific light emitting pattern, and thus is not uniformly emitted in all directions. However, light-emitting diodes with phosphors emit light by scattering light from light-emitting elements by the phosphors, so that light can be emitted uniformly over a wide area without forming unnecessary light emission patterns. I can do it.
- the light from the light emitting element has a monochromatic peak, it has a high degree of color rendering because it has a certain spectral width. This is an essential advantage when used as a light source that requires a relatively wide range of wavelengths. For example, when used as a light source of a scanner, it is preferable that the spectrum width is wide.
- the light-emitting diode of Embodiment 1.2 described below is a light-emitting diode having a structure shown in FIG. 1 or FIG. 2 and a light-emitting element using a nitride-based compound semiconductor having relatively high light energy in a visible light region. It is characterized by a combination with a specific photoluminescent phosphor, which enables high-luminance light emission, and has excellent characteristics such as reduced luminous efficiency and less color shift over a long period of use. Having.
- phosphors that absorb short-wavelength light and emit long-wavelength light convert more than phosphors that absorb long-wavelength light and emit short-wavelength light. Since the efficiency is excellent, in the light emitting diode of the present invention, it is preferable to use a gallium nitride based semiconductor light emitting device (light emitting device) capable of emitting blue light of a short wavelength. Needless to say, it is preferable to use a light emitting element with high luminance.
- Light-emitting devices Provided near the light-emitting elements 102 and 202, and exposed to strong light ranging from about 30 to 40 times that of sunlight. Excellent light resistance so that it can withstand long periods of time.
- the color tone can be changed continuously by changing the composition ratio or the mixing ratio of multiple phosphors.
- the light-emitting diode according to the first embodiment of the present invention includes a gallium nitride-based compound semiconductor element having a high-energy single-band gear in a light-emitting layer, capable of emitting blue light, and photoluminescence capable of emitting yellow light. It is a combination of a phosphor, a garnet-based photoluminescent phosphor activated by a cell. As a result, in the light emitting diode of the first embodiment, the blue light emitted from the light emitting elements 102 and 202 and the yellow light emitted from the photoluminescent phosphor excited by the light are emitted. Due to the color mixture with White light emission becomes possible.
- the cerium-activated garnet-based phosphorescent phosphor used in the light-emitting diode of Embodiment 1 has light resistance and weather resistance, so that it can emit light in the visible light range emitted from the light-emitting elements 102 and 202. Even when high energy is irradiated for a long time with high luminance in the vicinity of the light, white light can be emitted in which the emission colors are not very different and the emission luminance is hardly reduced.
- the photoluminescent phosphor used in the light emitting diode of the first embodiment is a photoluminescent phosphor that is excited by visible light or ultraviolet light emitted from the semiconductor light emitting layer and emits light having a different wavelength from the excited light.
- the photoluminescent phosphor may include at least one element selected from Y, Lu, Sc, La, Gd, and Sm, and at least one element selected from Al, Ga, and In. And is a garnet-based phosphor activated with cerium.
- a yttrium 'aluminum ganet-based phosphor containing Y and A1 and activated with cerium or a general formula (Re!
- R S mr) a (A1 i-sG a s ) 5 0 12 It is preferable to use a phosphor represented by Ce (where 0 ⁇ r 1 and 0 ⁇ s ⁇ l. Re is at least one selected from Y and Gd).
- a gallium nitride compound semiconductor When a gallium nitride compound semiconductor is used, the LED light emitted by the light emitting element and the fluorescent light emitted by the photoluminescent phosphor having a yellow body color have a complementary color relationship, and the LED light and the fluorescent light By mixing the two colors and outputting, white light can be output as a whole.
- the photoluminescent phosphor is formed of the coating resin 101 and the resin forming the coating portion 201 (details). (Details will be described later).
- the color tone of the light-emitting diode can be set arbitrarily, such as the color of the light bulb, including white, by adjusting the filling amount of the light.
- the distribution of the photoluminescent phosphor also affects the color mixing and durability. For example, when the distribution of the photoluminescent phosphor is increased from the surface of the coating or the mold member containing the photoluminescent phosphor toward the light emitting element, the influence of moisture from the external environment is reduced. It is hard to receive and can prevent deterioration due to moisture. On the other hand, if the photoluminescent phosphor is distributed from the light emitting device to the surface side of the mold member or the like so that the degree of distribution becomes higher, it is easy to receive the influence of moisture from the external environment, but the light emitting device emits light.
- Such a distribution of the photoluminescent phosphor can be realized in various ways by adjusting the material containing the photoluminescent phosphor, the forming temperature, the viscosity, the shape, the particle size distribution, etc. of the photoluminescent phosphor.
- the distribution state is set in consideration of the usage conditions of the light emitting diode.
- the photoluminescent phosphor of Embodiment 1 is placed in contact with or close to the light emitting elements 102 and 202, and has an irradiation intensity (E e) of 3 W'cm 2 or more and 10 W * cm 2 or more. Even in the following, since the phosphor has high efficiency and sufficient light resistance, a light emitting diode having excellent light emitting characteristics can be formed by using the phosphor.
- the photoluminescent phosphor of Embodiment 1 since the photoluminescent phosphor of Embodiment 1 has a garnet structure, it is resistant to heat, light and moisture, and as shown in FIG. 3A, the peak of the excitation spectrum is near 450 nm. can do. The emission peak is also shown in Fig. 3. As shown in Fig. B, it has a broad emission spectrum near 580 nm, which extends to 700 nm.
- the photoluminescent phosphor of the first embodiment can increase the excitation light emission efficiency in a long wavelength region of 460 nm or more by containing Gd in the crystal. Due to the increase in the Gd content, the emission peak wavelength shifts to a longer wavelength, and the overall emission wavelength shifts to the longer wavelength side.
- Table 1 Each characteristic shown in Table 1 was measured by excitation with 460 nm blue light. The luminance and efficiency in Table 1 are shown as relative values, with the material of 1 being 100.
- a light-emitting diode capable of emitting white light substantially along the blackbody radiation trajectory can be constructed using the aluminum garnet-based phosphor.
- Note c can, the content of Ce (substitution amount), by a child set in the range of 0.003 to 0.2, the relative luminous intensity of light emitting diodes can be 70% or more.
- the luminous intensity decreases due to the decrease in the number of photoluminescence excitation centers due to Ce, and conversely, when the content exceeds 0.23, quenching occurs.
- the emission wavelength can be shifted to a shorter wavelength by substituting a part of A1 of the composition with Ga, and the luminescence can be shifted by substituting a part of Y of the composition with Gd.
- the wavelength can be shifted to longer wavelengths.
- Hg emission lines with wavelengths of 2 ⁇ 4 nm and 365 nm are hardly excited.
- the nitride semiconductor light emitting device has ideal conditions for converting blue light emission to white light emission such that the peak wavelength can be continuously changed by the composition ratio of Gd.
- the light emitting element using the gallium nitride based semiconductor and the yttrium 'aluminum garnet phosphor (YAG) activated with cerium contain the rare earth element samarium (Sm).
- the luminous efficiency of the light emitting diode can be further improved by combining with the photoluminescent phosphor.
- Such photoluminescent phosphors use an oxide or a compound that easily becomes an oxide at high temperature as a raw material for Y, Gd, Ce, Sm, A1, and Ga, and convert them into a predetermined chemical compound.
- a mixed raw material is prepared by sufficiently mixing at a theoretical ratio, and an appropriate amount of a fluoride such as ammonium fluoride is mixed as a flux with the prepared mixed raw material, and the mixture is packed in a crucible.A temperature range of 1350 to 1450 ° C in air Baking for 2 to 5 hours to obtain a baked product, then pole milling the baked product in water, washing, separating, drying, and finally passing through a sieve.
- the mixed raw material is a coprecipitated oxide obtained by calcining a solution obtained by dissolving a rare earth element of Y, Gd, Ce, and Sm in an acid at a stoichiometric ratio with oxalic acid. And aluminum oxide and gallium oxide.
- ⁇ r Gd P C e q Sm r can be represented by 3 A 1 5 0 12 follower Toruminesensu phosphor, by containing Gd in the crystal, in particular 46 O nm or longer wavelength region Can increase the excitation light emission efficiency. Also, by increasing the gadolinium content, the emission peak wavelength is shifted from 530 nm to 570 nm to a longer wavelength, and the overall emission wavelength is also shifted to the longer wavelength side. It can be shifted. When a reddish luminescent color is required, this can be achieved by increasing the substitution amount of Gd. On the other hand, as Gd increases, the emission luminance of photoluminescence due to blue light gradually decreases. Accordingly, p is preferably at 0.8 or less, it is 0.7 or less is more preferred c more preferably 0.6 or less.
- the temperature be increased content of Gd The decrease in characteristics can be reduced. That is, by including Sm, the deterioration of the emission luminance of the photoluminescent phosphor at a high temperature is greatly improved. The degree of improvement increases with increasing Gd content.
- phosphors with a composition in which the Gd content is increased to add reddish to the color tone of photoluminescence emission have poor temperature characteristics, so it is effective to include Sm to improve the temperature characteristics.
- the temperature characteristic is the relative value (%) of the emission luminance of the same phosphor at high temperature (200 ° C) with respect to the excitation emission luminance at room temperature (25 ° C) of blue light of 450 nm. It is.
- the content r of Sm is preferably in the range of 0.0003 r ⁇ 0.08, whereby the temperature characteristic can be made 60% or more. If r is smaller than this range, the effect of improving the temperature characteristics is reduced. On the other hand, if r becomes larger than this range, the temperature characteristics will be deteriorated. Further, the content r of Sm is more preferably in the range of 0.0007 ⁇ r ⁇ 0.02, whereby the temperature characteristic can be increased to 80% or more.
- the Ce content Q is preferably in the range of 0.003 ⁇ Q ⁇ 0.2, whereby the relative emission luminance can be increased to 70% or more.
- the Ce content q is 0.003 or less, the number of photoluminescence-excited emission centers due to Ce decreases, so that the luminance decreases.
- the Ce content is larger than 0.2, quenching occurs.
- the quenching means that when the concentration of the activator is increased in order to increase the brightness of the phosphor, the emission intensity is reduced at a concentration higher than a certain optimum value.
- a l, Ga, the content of Y and Gd and Sm are two or more different (Y have P - - r Gd P C e q Sm r) 3 A 1 5 0 12 follower Toruminesensu
- a mixture of phosphors may be used. This makes it possible to reduce the wavelength components of RGB during fluorescent light emission. For example, by using a color filter, it can be used for a full-color liquid crystal display device. (Light emitting element 102, 202)
- the light emitting element is preferably embedded in a mold member as shown in FIGS.
- the light-emitting element used for the light-emitting diode of the present invention is a gallium nitride-based compound semiconductor that can efficiently excite a garnet-based phosphor activated with cerium.
- Light-emitting elements 102 and 202 using a gallium nitride-based compound semiconductor are manufactured by forming a gallium nitride-based semiconductor such as InGaN as a light-emitting layer on a substrate by MOCVD or the like.
- Examples of the structure of the light emitting element include a homostructure having a MIS junction, a PIN junction, and a PN junction, a heterostructure, and a double heterostructure.
- the active layer of the light emitting element has a single quantum well structure of InGaN, so that the light emitting diode can be used as a light emitting diode that emits light with higher luminance without deterioration of the photoluminescent phosphor. be able to.
- materials such as sapphire, spinel, Si (:, Si, ZnO) can be used for the semiconductor substrate.
- a sapphire substrate for this purpose.
- a gallium nitride semiconductor layer is formed so as to form a PN junction via a buffer layer such as GaN and AIN.
- a buffer layer such as GaN and AIN.
- Si and Ge are used as N-type dopants. , Se, Te, C, etc.
- p-type dopants Zn, Mg, Be, Ca, Do S r, Ba Gallium nitride-based compound semiconductors are difficult to become p-type by doping the p-type dopant alone, so that after introducing the p-type dopant, the gallium nitride-based compound semiconductor is made to be p-type by heating in a furnace, irradiating a low-speed electron beam, or irradiating plasma.
- each electrode having a desired shape is formed on each semiconductor layer by using a sputtering method, a vacuum evaporation method, or the like.
- a method of directly cutting the semiconductor wafer or the like formed as described above with a dicing machine, or after cutting a groove having a width larger than the width of the cutting edge (half cut), is used to cut the semiconductor wafer by an external force.
- a very small scribe line (meridian) is drawn on the semiconductor wafer by, for example, a checkerboard using a scriber in which the diamond needle at the tip reciprocates linearly, and then the wafer is split by an external force. Cut the wafer into chips. In this manner, a light emitting device made of a gallium nitride-based compound semiconductor can be formed.
- the emission wavelength of the light-emitting element is preferably set at 40 O nm or more and 530 nm or less in consideration of the complementary color relationship with the torluminescent phosphor, deterioration of the resin, etc., and more preferably 420 nm or more and 490 nm or less. It is more preferable to set. In order to further improve the efficiency of the light emitting element and the efficiency of the photoluminescent phosphor, it is more preferable to set the wavelength to 450 nm or more and 475 nm or less.
- FIG. 4 shows an example of a light emitting spectrum of the white light emitting diode of the first embodiment.
- the light emitting diode exemplified here is of the lead type shown in FIG. 1, and uses the light emitting element of Example 1 described later and a photoluminescent phosphor.
- light emission having a peak near 450 nm is light emission from the light emitting element
- light emission having a peak near 570 nm is light emission of photoluminescence excited by the light emitting element. .
- Fig. 16 shows the color reproduction range that can be realized with a white light-emitting diode that combines the phosphors shown in Table 1 with a blue LED (light-emitting element) having a peak wavelength of 465 nm. Since the emission color of this white light emitting diode is located on one of the straight lines connecting the chromaticity point originating from the blue LED and the chromaticity point originating from the phosphor, the phosphors (1) to (4) in Table 1 are used. As a result, it is possible to cover all of the wide white area in the center of the chromaticity diagram (the shaded area in Fig. 16).
- FIG. 17 shows the change in the emission color when the phosphor content in the white light emitting diode is changed. Here, the content of the phosphor is shown by weight percentage with respect to the resin used for the coating part. As is evident from Fig. 17, increasing the amount of the phosphor approaches the emission color of the phosphor, and decreasing it approaches the blue LED.
- a light emitting element that does not excite the phosphor can be used together with a light emitting element that generates light that excites the phosphor.
- a light-emitting element which does not substantially excite the body and whose light-emitting layer is gallium phosphide, gallium aluminum arsenide, gallium arsenide phosphide, indium aluminum phosphide, or the like is provided together.
- light from the light emitting element that does not excite the phosphor is emitted outside without being absorbed by the phosphor.
- a light emitting diode capable of emitting red and white light can be obtained.
- the conductive wires 103 and 203 are required to have good uniformity with the electrodes of the light emitting elements 102 and 202, good mechanical contact, good electrical conductivity, and good thermal conductivity.
- the thermal conductivity is preferably at least 0.01 cal / (s) (cm 2 ) (.C / cm), more preferably at least 0.5 cal Z (s) (cm 2 ) (° C / cm). It is.
- the diameter of the conductive wire is preferably 1001 or more and 45 / im or less. In particular, even if the same material is used for the coating part containing the phosphor and the mold member, the difference in thermal expansion coefficient due to the phosphor entering one of them causes the interface between them to be conductive.
- the diameter of the conductive wire is more preferably 25 im or more, and is preferably 35 m or less from the viewpoint of the light emitting area and ease of handling.
- the material of the conductive wire include metals such as gold, copper, platinum, and aluminum, and alloys thereof.
- the mount 105 is composed of a cup part 105a and a lead part 105b.
- the light emitting element 102 is mounted on the cup part 105a by a die bonding apparatus. It just needs to be large enough to be placed. Also, when a plurality of light-emitting elements are provided in a cup and the mount and lead are used as a common electrode of the light-emitting elements, different electrode materials may be used, so that each has sufficient electric conductivity and bonding wire. Connectivity is required. In addition, when the light emitting element is arranged in the forceps on the mounting lead and the phosphor is filled inside the forceps, even if the light from the phosphor is emitted isotropically, the light is desirably determined by the cup.
- the pseudo-lighting refers to a phenomenon in which it appears that light is emitted even when power is not supplied to another light-emitting diode arranged in close proximity.
- Adhesion between the light emitting element 102 and the cup portion 105a of the mount lead 105 can be performed using a thermosetting resin such as an epoxy resin, an acrylic resin, or an imido resin.
- a face-down light-emitting element (a type that extracts light from the substrate side and is configured so that an electrode of the light-emitting element is attached to face the power-up portion 105a) is used.
- Ag base, carbon paste, metal bumps, or the like can be used to adhere the lead to the mount lead and make it electrically conductive.
- the surface of the cup portion of the mount lead on which the light emitting element is arranged may be made mirror-like, and the surface may have a reflection function.
- the surface roughness is preferably 0.1 S or more and 0.8 S or less.
- the specific electrical resistance of the mount / lead is preferably 300 ⁇ -cm or less, more preferably 3 // ⁇ ⁇ cm or less.
- Z (s) (cm 2 ) (° CZ cm) or more is preferred, and more preferred Is greater than 0.5 cal Z (s) (cm 2 ) (:. CZ cm).
- Materials satisfying these conditions include iron, copper, copper with iron, copper with tin, and ceramics with metallized patterns.
- the inner lead 106 is connected to one electrode of the light emitting element 102 arranged on the mount lead 105 by a conductive wire or the like.
- a conductive wire or the like In the case of a light emitting diode in which a plurality of light emitting elements are provided on a mount lead, it is necessary to provide a plurality of inner leads 106 and arrange each of the inner leads so that the conductive wires do not contact each other. For example, by increasing the area of each end face of each inner lead to be wire-bonded as it moves away from the mount lead, bonding is performed so as to increase the space between the conductive wires, and the distance between the conductive wires is increased. Contact can be prevented. It is preferable that the roughness of the connection end face of the inner lead to the conductive wire is set to 1.6 S or more and 1 O S or less in consideration of adhesion.
- the inner lead can be formed by a punching process using a mold so as to have a desired shape. Further, after punching and forming the inner lead, the area and the height of the desired end face may be adjusted by applying pressure from the end face direction.
- the inner lead is required to have good connectivity and electrical conductivity with a bonding wire such as a conductive wire.
- the specific electric resistance is preferably not more than 300 ⁇ ⁇ cm, more preferably not more than 3 ⁇ ⁇ cm.
- Materials satisfying these conditions include iron, copper, iron-containing copper, tin-containing copper and copper, aluminum, iron, and copper plated with gold and silver.
- the coating portion 101 is provided on the mount's lead cup separately from the mold member 104.
- the coating portion 101 contains a photoluminescent phosphor for converting light emission of the light emitting element. Is what is done.
- a transparent resin having excellent weather resistance such as an epoxy resin, a urea resin, or silicone, or a glass is suitable.
- a diffusing agent may be contained together with the photoluminescence phosphor.
- the coating portion can be omitted. In this case, by adjusting the film thickness or providing an opening in the phosphor layer, a light emitting diode capable of performing mixed color display can be obtained.
- the mold member 104 has a function of protecting the light emitting element 102, the conductive wire 103, the coating portion 101 containing the photoluminescent phosphor, and the like from the outside.
- the mold member 104 further contain a diffusing agent, whereby the directivity from the light emitting element 102 can be reduced, and the viewing angle can be increased.
- the mold member 104 has a lens function of focusing or diffusing light emitted from the light emitting element in the light emitting diode. Therefore, the mold member 104 is usually formed in a convex lens shape, a concave lens shape, an elliptical shape when viewed from the light emission observation surface, or a shape obtained by combining a plurality of them.
- the mold member 104 may have a structure in which a plurality of different materials are laminated.
- Specific examples of the c- mold member 104 include mainly epoxy resin, urine resin, and silicone resin.
- a transparent resin or glass excellent in weather resistance is preferably used.
- the diffusing agent barium titanate, titanium oxide, Aluminum oxide, silicon oxide, or the like can be used.
- a photoluminescent phosphor may be contained in the mold member in addition to the diffusing agent. That is, in the present invention, the photoluminescent phosphor may be contained in the coating portion or may be contained in the mold member. By including the photoluminescent phosphor in the mold member, the viewing angle can be further increased. Further, it may be contained in both the coating part and the mold member.
- the coating portion may be made of a resin containing the photoluminescent phosphor, and the mold member may be formed using glass, which is a member different from the coating portion.
- a light emitting diode with little influence can be manufactured with high productivity.
- the mold member and the coating portion may be formed using the same member in order to adjust the refractive index.
- the coloring of the phosphor viewed from the emission observation surface side can be hidden and the color mixing property can be further improved. That is, the phosphor absorbs the blue component of the strong external light, emits light, and appears to be colored yellow.
- the diffusing agent contained in the mold member makes the mold member milky white, and the colorant colors the desired color. As a result, the color of the phosphor is not observed from the emission observation surface. Further, when the main emission wavelength of the light emitting element is at least 430 nm, it is more preferable to include an ultraviolet absorber as a light stabilizer. Implementation of the invention 2.
- the light emitting diode according to the second embodiment of the present invention uses a silicon nitride having a gallium nitride based semiconductor having a high energy band gap in a light emitting layer as a light emitting element, and uses two types of photoluminescent phosphors having different compositions from each other.
- the photoluminescence phosphor described above preferably a phosphor containing an yttrium-aluminum-garnet phosphor activated with cerium is used.
- the light emitting diode according to the second embodiment can adjust the content of two or more kinds of phosphors even when the emission wavelength of the LED light emitted by the light emitting element deviates from a desired value due to manufacturing variations or the like.
- a light emitting diode having a desired color tone can be manufactured.
- a phosphor with a relatively short emission wavelength is used for a light-emitting element with a relatively short emission wavelength
- a phosphor with a relatively long emission wavelength is used for a light-emitting element with a relatively long emission wavelength.
- the emission color output from the diode can be kept constant.
- the photoluminescence phosphor is activated by cerium represented by the general formula (R e,-r S r r r) 3 (A 1 i- 5 G a s ) 5 0 12 : C e
- cerium represented by the general formula (R e,-r S r r r) 3 (A 1 i- 5 G a s ) 5 0 12 : C e
- 0 ⁇ r ⁇ l, 0 ⁇ sl, and Re are at least one selected from Y, Gd, and La. This makes it possible to reduce the deterioration of the phosphor even when the light with high energy in the visible light range emitted from the light emitting element is irradiated with high luminance for a long time or under various external environments.
- a light-emitting diode having a desired light-emitting component with high luminance and extremely low color shift and a decrease in light-emitting luminance can be constructed.
- the photoluminescent phosphor used in the light emitting diode of the second embodiment will be described in detail.
- the second embodiment has the same configuration as the first embodiment except that a photoluminescence phosphor activated with two or more types of cerium having different compositions is used as the photoluminescence phosphor.
- the method of using the phosphor is the same as in the embodiment.
- the weather resistance can be improved by changing the distribution of the photoluminescent phosphor in various ways (such as providing a concentration gradient as the distance from the light emitting element increases).
- the light emitting diode can have strong characteristics.
- Such a distribution can be variously adjusted by adjusting the member containing the photoluminescent phosphor, the forming temperature, the viscosity, the shape of the photoluminescent phosphor, the particle size distribution, and the like. Therefore, in the second embodiment, the distribution of the phosphors is set in accordance with the usage conditions and the like.
- the light emission is achieved by devising the arrangement of two or more types of phosphors corresponding to the light output from the light emitting element (for example, arranging them in order from the one closer to the light emitting element). Efficiency can be increased.
- a light-emitting diode having high efficiency and sufficient light resistance can be formed even when the light-emitting diodes are arranged in contact with or close to each other.
- the yttrium 'aluminum garnet-based phosphor (YAG-based phosphor) activated with cerium used in the second embodiment has a garnet structure as in the first embodiment. Resistant to light and moisture.
- the yttrium.aluminum 'garnet-based phosphor of the second embodiment can set the peak of the excitation spectrum at around 450 nm as shown by the solid line in FIG.
- the emission peak can be set at around 510 nm as shown by the solid line in Fig. 5B, and the emission spectrum can be broadened so as to extend to 700nm. Thereby, green light can be emitted.
- the yttrium 'aluminum' garnet-based phosphor activated by another cell of Embodiment 2 shows the peak of the excitation spectrum at around 450 nm as shown by the broken line in FIG. 5A.
- the emission peak of the emission spectrum can be set to around 600 nm as shown by the broken line in FIG. 5B, and the emission spectrum can be broadened to 750 nm. This enables red light emission Obviouslys
- the emission wavelength is shifted to the shorter wavelength side, and part of the Y in the composition is changed to Gd and / or Alternatively, the emission wavelength is shifted to the longer wavelength side by substitution with La.
- Such photoluminescent phosphors use oxides or compounds that readily become oxides at high temperatures as raw materials for Y, Gd, Ce, La, Al, Sm, and Ga. Mix well at stoichiometric ratio to obtain raw material.
- a coprecipitated oxide obtained by calcining a solution obtained by dissolving rare earth elements of Y, Gd, Ce, La, and Sm in an acid at a stoichiometric ratio with oxalic acid, and oxidizing
- a mixed raw material is obtained by mixing aluminum and gallium oxide.
- a fluoride such as ammonium fluoride
- An appropriate amount of a fluoride such as ammonium fluoride is mixed into the crucible as a flux, and the mixture is placed in a crucible and fired in air at a temperature of 135 to 140 ° C. for 2 to 5 hours to obtain a fired product.
- the product can be obtained by ball milling the calcined product in water, washing, separating, drying, and finally passing through a sieve.
- the yttrium 'aluminum-garnet phosphor activated by two or more kinds of cerium having different compositions may be used as a mixture or may be independently arranged (for example, (Stacked).
- a color conversion section can be formed relatively easily and with good mass productivity, and when two or more phosphors are independently arranged, a desired color is obtained. By overlapping until it becomes Color can be adjusted.
- a phosphor that absorbs and emits light on the shorter wavelength side is provided closer to the LED element, and is located farther away from the LED. It is preferable to arrange a phosphor that absorbs and emits light on the long wavelength side. This makes it possible to efficiently absorb and emit light.
- the light emitting diode of Embodiment 2 uses two or more kinds of yttrium-aluminum-garnet-based phosphors having different compositions as the phosphor. This makes it possible to form a light emitting diode capable of efficiently emitting a desired light emitting color. That is, when the emission wavelength of the light emitted by the semiconductor light emitting element is located on the line from point A to point B in the chromaticity diagram shown in FIG. 6, two or more types of yttrium aluminum garnet having different compositions Any luminescent color can be emitted within the shaded area surrounded by points A, B, C, and D in Fig.
- the adjustment can be made by variously selecting the composition or the amount of the LED element and the phosphor.
- the composition or the amount of the LED element and the phosphor In particular, by compensating for variations in the emission wavelength of the LED element by selecting a predetermined phosphor corresponding to the emission wavelength of the LED element, it is possible to construct a light emitting diode with less variation in the emission wavelength. . Also, by selecting the emission wavelength of the fluorescent substance, it is possible to construct a light-emitting diode containing the RGB light-emitting components with high luminance.
- the light-emitting diode of the second embodiment can emit light with high luminance for a long time.
- a light emitting element is provided via a phosphor when viewed from the light emission observing surface.
- a fluorescent substance that emits light on a longer wavelength side than the light from the light emitting element is used, light can be emitted efficiently.
- the converted light has a longer wavelength side than the light emitted from the light emitting element, it is smaller than the band gap of the nitride semiconductor layer of the light emitting element, and is hardly absorbed by the nitride semiconductor layer. Therefore, the light emitted by the phosphor isotropically emitting light is directed toward the LED element. The light emitted by the phosphor is not absorbed by the LED element, and the luminous efficiency of the light emitting diode is reduced. It does not decrease.
- FIG. 7 shows an example of a planar light source according to another embodiment of the present invention.
- the photoluminescent phosphor used in the first or second embodiment is contained in the coating part 701.
- the blue light generated by the gallium nitride-based light-emitting element is converted into a color at the coating portion, and is then output in a planar shape via the light guide plate 704 and the scattering sheet 706.
- the light emitting element 720 is fixed in a U-shaped metal substrate 70 3 on which an insulating layer and a conductive pattern (not shown) are formed. Is done. After the electrodes of the light emitting element are electrically connected to the conductive pattern, the photoluminescent phosphor is mixed with the epoxy resin to fill the inside of the U-shaped metal substrate 703 on which the light emitting element 702 is mounted. .
- the light emitting element 702 thus fixed is fixed to one end face of the acryl light guide plate 704 with an epoxy resin or the like.
- a portion of the light guide plate 704 on one main surface where the scattering sheet 706 is not formed is a film-like reflecting member 7 containing a white scattering agent for preventing a fluorescent phenomenon that emits a point-like light. 0 7 is formed.
- a reflection member 705 is provided on the entire surface of the other main surface (back side) of the light guide plate 704 and on the other end surface on which the light-emitting element is not arranged, to improve luminous efficiency. This allows, for example, LCD backlighting As a result, a light emitting diode of planar light emission having sufficient brightness can be formed.
- a liquid crystal display device using the planar light emitting diode is, for example, provided between a glass substrate (not shown) having a light transmitting conductive pattern formed on one main surface of a light guide plate 704.
- a polarizing plate is arranged via a liquid crystal device in which liquid crystal is injected.
- FIGS. 8 and 9 show examples of a planar light emitting device according to another embodiment of the present invention.
- the light-emitting device shown in FIG. 8 converts the blue light generated by the light-emitting diode 720 into white light via a color conversion member 71 containing a photoluminescent phosphor, and then guides the light.
- the light plate 704 is configured to output in a planar shape.
- the light-emitting device shown in FIG. 9 was formed on one main surface of the light guide plate 704 after the blue light emitted by the light-emitting element 720 was planarized by the light guide plate 704.
- the light is converted into white light by a scattering sheet 706 having a photoluminescent phosphor to output planar white light.
- the photoluminescent phosphor may be contained in the scattering sheet 706, or may be applied to the scattering sheet 706 together with the binder resin to form a sheet.
- the binder containing the photoluminescent phosphor may be directly formed on the light guide plate 704 in a dot shape instead of a sheet shape.
- FIG. 10 is a block diagram showing the configuration of the display device according to the present invention.
- the display device includes a drive circuit 6 having an LED display 61, a driver circuit 602, an image data storage device 603, and a gradation control device 604. Consists of 10
- the LED display 601 has a white light emitting diode 501 shown in FIG. 1 or FIG. 2 arranged in a matrix on a housing 504, and is used as a black and white LED display device. used.
- a light shielding member 505 is integrally formed with the housing 504.
- the drive circuit 610 includes image data storage means (RAM) 603 for temporarily storing input display data, and respective light emitting diodes of the LED display 601 based on data read from the RAM 603.
- a gradation control means 604 for calculating and outputting a gradation signal for lighting the LED to a predetermined brightness, and a driver for lighting the light emitting diode by switching with the signal output from the gradation control means 604 And one 602.
- the gradation control circuit 604 extracts the data stored in the RAM 603, calculates the light emitting diode lighting time of the LED display 601, and outputs a pulse signal for blinking to the LED display 601.
- the LED display 601 can display an image corresponding to display data based on a pulse signal input from the drive circuit, and has the following advantages.
- an LED display that displays white light using three RGB light-emitting diodes needs to adjust the light-emission output of each RGB light-emitting diode for display. Since each light emitting diode must be controlled in consideration of characteristics and the like, there is a problem that a driving circuit for driving the LED display is complicated.
- the display device of the present invention is configured using the light emitting diode 501 capable of emitting white light according to the present invention without using the three types of light emitting diodes of the LED display 601 601 RGB.
- the drive circuit does not need to control each of the RGB light emitting diodes individually, simplifying the drive circuit configuration And the display device can be inexpensive.
- an LED display that displays white light using three RGB light-emitting diodes is used.To achieve white light by combining three RGB light-emitting diodes for each pixel, three light-emitting diodes must be used. It was necessary to emit light at the same time and mix the colors, and the display area per pixel became large, and high-definition display was not possible.
- the LED display in the display device of the present invention can perform white display with one light-emitting diode, so that white display can be performed with higher definition.
- one of the RGB light emitting diodes may be partially shielded and the display color may change. This is not the case with LED indicators.
- the display device provided with the LED display using the light emitting diode capable of emitting white light according to the present invention can achieve higher definition, can perform stable white display, and There is a feature that color unevenness can be reduced. Further, the LED display capable of white display according to the present invention is less irritating to human eyes than a conventional LED display using only red and green, and is suitable for long-time use.
- an LED display can be constructed in which three RGB light-emitting diodes plus the light-emitting diode of the present invention constitute one picture element.
- a display device capable of displaying various images can be configured.
- the drive circuit in this display device is based on image data storage means (RAM) for temporarily storing input display data, and data stored in the RAM.
- a gradation control circuit for calculating a gradation signal for lighting each light emitting diode to a predetermined brightness, and a driver for lighting each light emitting diode by switching with the output signal of the gradation control circuit .
- this drive circuit requires a dedicated circuit to control each light emitting diode that emits light in RGB and white light systems.
- the gradation control circuit calculates the lighting time of each light emitting diode from the data stored in the RAM, and outputs a pulse signal for blinking.
- Supply pulse signal supplied pulse signal. As a result, the white color of the LED display is displayed.
- the luminance of the display can be improved by adding the white light emitting diode to the light emitting diode of RGB. Also, if you try to display white with a combination of RGB, depending on the viewing angle, one or t or two or two of the RGB colors will be emphasized, and pure white cannot be expressed, but this display Such a problem can be solved by adding a white light emitting diode like a device.
- a CPU as a gradation control circuit for calculating a pulse signal for lighting the white light emitting diode at a desired luminance.
- the pulse signal output from the gradation control circuit is input to the driver of the white light emitting diode to switch the driver.
- the white light emitting diode lights up when the driver is turned on, and goes off when the driver is turned off. (traffic light)
- the light-emitting diode of the present invention When the light-emitting diode of the present invention is used as a traffic light, which is a type of display device, it is possible to emit light stably for a long time, and color unevenness does not occur even if part of the light-emitting diode is turned off. There is a feature.
- white light emitting diodes are arranged in a predetermined arrangement on a base slope on which a conductive pattern is formed.
- a light emitting diode circuit in which such light emitting diodes are connected in series or in series / parallel is treated as a light emitting diode group.
- each light-emitting diode is arranged in a spiral.
- the light emitting diodes are arranged in a circle on the entire surface.
- the LED display is placed inside an aluminum die-cast housing with a light-blocking member, and its surface is sealed with silicone rubber filler.
- the display surface of the housing is provided with a white lens.
- the electric wiring of the LED display is passed through the rubber packing to seal the housing from the back of the body, and the inside of the body is sealed. In this way, a white traffic light can be formed.
- the light emitting diodes of the present invention are divided into a plurality of groups, arranged in a spiral shape forming a ring from the center to the outside, and connected in parallel, whereby a more reliable traffic signal can be configured.
- a highly reliable traffic light can be constructed by drawing a ring from the center to the outside.
- To draw a loop from the center to the outside includes both a continuous loop and an intermittent one. Therefore, the number of light emitting diodes and the number of light emitting diode groups to be arranged can be variously selected in consideration of the display area of the LED display and the like.
- the other light emitting diode With this signal, even if one light emitting diode group or some light emitting diodes are turned off due to some trouble, the other light emitting diode
- the group of diodes--the remaining light emitting diodes make it possible to make the traffic light emit uniformly in a circular shape, and no color shift occurs. Since it is arranged in a spiral shape, the central part can be arranged densely, and it can be driven without any discomfort from the signal of the light emission of the bulb.
- Example 1 is an example in which a GaInN semiconductor having a light emission peak of 450 nm and a half value width of 30 nm is used as a light emitting element.
- a TMG (trimethyl gallium) gas, a TM I (trimethyl indium) gas, a nitrogen gas, and a doubant gas are flowed together with a carrier gas on a cleaned sapphire substrate, and the gallium nitride-based compound semiconductor is formed by MOCVD. It is produced by forming a film.
- the LED element of Example 1 has a contact layer of a gallium nitride semiconductor having N-type conductivity, a clad layer of a gallium aluminum nitride semiconductor having P-type conductivity, and a gallium nitride semiconductor having P-type conductivity.
- the active layer is formed of a group I n G a N.
- a gallium nitride semiconductor layer is formed on the sapphire substrate as a buffer layer at a low temperature. Further, the P-type gallium nitride semiconductor is annealed at a temperature of 400 ° C. or more after film formation. After exposing the P-type and N-type semiconductor surfaces by etching, the n-side and p-side electrodes are respectively formed by sputtering. After a scribe line was drawn on the semiconductor wafer thus manufactured, an external force was applied to divide the semiconductor wafer into individual light emitting devices.
- each electrode of the light emitting device and the mount, lead and inner lead are connected. Wire-bonding was performed using gold wires each having a diameter of 30 ⁇ m to produce a lead-type light-emitting diode.
- photoluminescent phosphors are obtained by co-precipitating a solution of rare earth elements of Y, Gd and Ce in an acid at a specified stoichiometric ratio with oxalic acid, and firing the precipitate.
- the coprecipitated oxide and aluminum oxide are mixed, this mixed raw material is mixed with ammonium fluoride as a flux, packed in a crucible, fired in air at 140 ° C. for 3 hours, and then fired.
- the product was wet-ground using a ball mill, washed, separated, dried, and finally passed through a sieve.
- Y is as approximately 20% Germany thorium 'aluminum oxide which is substituted by G d (Y. 8 G d fl 2) 3 A 1 5 0, 2: C e is formed .
- the substitution of Ce was 0.03.
- a translucent epoxy resin was formed as a mold member for the purpose of further protecting the light emitting element photoluminescence phosphor from external stress, moisture, dust, and the like.
- the mold member is inserted into a shell-type mold by inserting a light-emitting element bonded to a lead frame and covered with a coating portion containing a photoluminescent phosphor, thereby forming a light-transmitting member.
- After injecting the epoxy resin it was cured at 150 ° C for 5 hours to form.
- the light-emitting diode formed in this corner was colored yellowish in the center by the body phosphor of the photoluminescent phosphor.
- the luminous efficiency was 9.51 m / w, comparable to a white light bulb.
- life tests of 25 mA at 60 ° C, 20 mA at 25 ° C, and 20 mA at 90% RH at 60 ° C no changes due to the phosphor were observed and the normal blue light emitting diode and lifetime were observed. It was confirmed that there was no difference in characteristics.
- Fig. 13 shows the life test results of 2 OmA energization at a temperature of 25 ° C 2 OmA energization and a temperature of 60 ° C 90% RH together with the results of Example 1.
- Luminance indicates relative values based on the initial value.
- the solid line indicates Example 1 and the dashed line indicates Comparative Example 1.
- the light emitting diode of Example 2 has a light emitting device having an In content of the nitride-based compound semiconductor larger than that of the light emitting device of Example 1 so that the light emitting device has an emission peak of 460 nm, and the photoluminescent phosphor G ⁇ palm than in example 1 the content of d (Ye 6 Gd 0 4. ) 3 a 1 5 0: the exception of using C e in the same manner as in example 1 to produce a light-emitting Daiodo.
- the light-emitting diode fabricated as described above can emit white light, and its chromaticity point, color temperature, and color rendering index were measured.
- 18A, 18B, and 18C show the light emission spectrum of the photoluminescent phosphor, the light emitting element, and the light emitting diode of Example 2, respectively. Further, 100 light emitting diodes of Example 2 were manufactured, and the luminous intensity after 1000 hours of light emission with respect to the initial luminous intensity was examined. As a result, assuming that the initial luminous intensity (before the life test) was 100%, the average luminous intensity after 1000 hours had passed was 98.8% on average, indicating no difference in characteristics.
- the light emitting diode of Example 3 has Y and G as photoluminescence phosphors. d, was contained Sm was added to the rare earth element of C e, the general formula (Y 0 39 Gd. 57 C eo osSmo.oi) 3 A 1 5 ⁇ , except for using 2 phosphor, similarly to Example 1 It was made in.
- the average temperature characteristic was about 8% better than that of the light emitting diode of Example 1.
- the LED display of the fourth embodiment is configured by arranging the light emitting diodes of the first embodiment on a ceramic base having a copper pattern as shown in FIG. 11 in a 16 ⁇ 16 matrix.
- the substrate on which the light emitting diodes are arranged is disposed inside a housing 504 made of fuanol resin and integrally formed with a light shielding member 505, and has a light emitting diode at the front end.
- silicon rubber 506 in which the housing, the light emitting diode, the substrate, and a part of the light shielding member are colored black by a pigment is filled. The connection between the substrate and the light emitting diode was soldered using an automatic solder mounting device.
- the LED display constructed as described above is used to temporarily store input display data in RAM, and to extract data stored in RAM to obtain a gradation signal for lighting the light emitting diode to a predetermined brightness. It was confirmed that the device can be used as a monochrome LED display device by being driven by a driving device including a gradation control circuit for calculating the luminance and a driver for switching the output signal of the gradation control circuit to turn on the light emitting diode.
- 19A, 19B and 19C show the light emitting spectrum of the photoluminescent phosphor, the light emitting element and the light emitting diode of Example 5, respectively.
- the light emitting diode of Example 5 had about 40% lower luminance than the light emitting diode of Example 1, but showed excellent weather resistance in the life test as in Example 1.
- Example 6 Emission Daiodo of Example 6, the general formula Y 3 A 1 5 0 12 as follower Toruminesensu phosphor: except for using phosphor represented by C e was produced in the same manner as in Example 1. 100 light emitting diodes of Example 6 were manufactured and various characteristics were measured.
- Example 20A, 20B, and 20C show the light emission spectrum of the photoluminescent phosphor, the light emitting element, and the light emitting diode of Example 6, respectively.
- the life test the light-emitting diode of Example 6 exhibited excellent weather resistance as in Example 1.
- Example 7 The light emitting diode of Example 7 was the same as Example 1 except that the phosphor represented by the general formula Y 3 (A 1 os G a 0 .s) 5 0 12 : Ce was used as the photoluminescent phosphor. It was produced in the same manner. 100 light emitting diodes of this Example 7 were produced and various characteristics were measured.
- the phosphor represented by the general formula Y 3 (A 1 os G a 0 .s) 5 0 12 : Ce was used as the photoluminescent phosphor. It was produced in the same manner. 100 light emitting diodes of this Example 7 were produced and various characteristics were measured.
- the light-emitting diode of Example 7 had low brightness but greenish white. It was able to emit colored light and showed excellent weather resistance in the life test as in Example 1.
- FIG. 21A, FIG. 21B, and FIG. 21C show the light emitting spectrum of the photoluminescent phosphor, the light emitting element, and the light emitting diode of Example 7, respectively. (Example 8)
- Example 8 Emission Daiodo of Example 8, as a follower Toruminesensu phosphor, the general formula Gd 3 (A 1 o 5 Ga 0 5..) 5 0 12: except for using phosphor containing no Y represented by C e is It was produced in the same manner as in Example 1. 100 light emitting diodes of Example 8 were manufactured and various characteristics were measured.
- the light-emitting diode of Example 8 had low luminance, but exhibited excellent weather resistance in a life test as in Example 1.
- the light emitting diode of the ninth embodiment is a planar light emitting device having the configuration shown in FIG.
- a TMG (trimethyl gallium) gas, a TMI (trimethyl indium) gas, a nitrogen gas and a dopant gas are flowed together with a carrier gas on a cleaned sapphire substrate, and a gallium nitride-based compound semiconductor is formed by MOC VD method. It was formed by this. And C p 2 Mg and S i H 4 as dopant Bok gas, to form the formed PN junction nitride Gariumu semiconductor having a nitride Gariumu semiconductor and the P-type conductivity having a N type conductivity by switching.
- Examples of the semiconductor light emitting device include a contact layer, which is a gallium nitride semiconductor having N-type conductivity, a clad, which is a gallium aluminum nitride semiconductor having N-type conductivity, and a gallium aluminum nitride having P-type conductivity.
- Cladding layer which is a semiconductor, is a gallium nitride semiconductor with P-type conductivity.
- a contact layer was formed.
- An active layer of Zn-doped InGaN that forms a double heterojunction was formed between the N-type conductive layer and the P-type conductive layer.
- a gallium nitride semiconductor was formed on a sapphire substrate at a low temperature and used as a buffer layer.
- the P-type nitride semiconductor layer is annealed at a temperature of 400 ° C. or more after film formation.
- each semiconductor layer After forming each semiconductor layer, exposing each semiconductor surface of PN by etching, forming each electrode by sputtering, drawing a scribe line on the completed semiconductor wafer, and dividing it by external force A light-emitting element was formed as a light-emitting element.
- the light emitting element was die-bonded with epoxy resin to a mount lead having a power tip at the tip of a silver-plated copper lead frame.
- Each electrode of the light emitting element and the mount, the lead and the inner lead were wire-bonded with a gold wire having a diameter of 30 nm to establish electrical continuity.
- the mold member insert a lead frame with light emitting elements arranged in a shell type mold, mix translucent epoxy resin, and cure at 150 ° C for 5 hours. Diodes were formed. A blue light emitting diode was connected to one end face of the acryl-based light guide plate whose end face was completely polished. One and side surfaces of the acryl plate were screen-printed and cured with a barium titanate dispersed in an acrylic binder as a white reflective member.
- the photoluminescence phosphor was prepared by coprecipitating a solution in which rare earth elements of Y, Gd, Ce, and La required for green and red were dissolved in an acid at a stoichiometric ratio with oxalic acid. This is mixed with a coprecipitated oxide obtained by calcination, aluminum oxide, and gallium oxide to obtain mixed raw materials. This was mixed with ammonium fluoride as a flux, packed in a crucible, and fired in air at a temperature of 140 ° C. for 3 hours to obtain a fired product. Put each fired product in water Milled, washed, separated, dried and finally formed through a sieve.
- the slurry was mixed well to form a slurry, and the slurry was evenly coated on a 0.5 mm thick acrylic layer using a multi-coater and dried to form a phosphor film as a color conversion member having a thickness of about 30.
- the phosphor layer was cut to the same size as the main light-emitting surface of the light guide plate and placed on the light guide plate to produce a planar light-emitting device.
- the luminous efficiency was 121 m / w, comparable to a white light bulb.
- no change due to the phosphor was observed in each test of 6 OmA at room temperature, 2 OmA at room temperature, and 2 OmA at 60 ° C and 90% RH.
- Example 9 12 first phosphor greenish capable emission represented by C e, and the general formula (Yo Gdo e) 3 A 1 5 0i2: instead of the follower Toruminesen scan phosphor red represented by C e is made of a second phosphor capable of emitting light, a green organic fluorescent pigment respectively a perylene derivative (Shi Nroihi (SI NLO IHI) chemistry FA-001) and a red organic fluorescent pigment (FA-005, manufactured by Shinroihi Chemical Co.) were mixed and stirred in the same amount, and a light-emitting diode was prepared in the same manner as in Example 9 to obtain the same as in Example 9.
- a green organic fluorescent pigment respectively a perylene derivative (Shi Nroihi (SI NLO IHI) chemistry FA-001) and a red organic fluorescent pigment (FA-005, manufactured by Shinroihi Chemical Co.
- Example 9 is less deteriorated than Comparative Example 2.
- the light emitting diode of Example 10 is a lead type light emitting diode.
- using a light-emitting element having a light emitting layer of I n 0 05 G a 0. 95 N of 45 0 nm was produced in the same manner as in Example 9.
- the light-emitting element is die-bonded to the cup at the tip of the silver-plated copper mount lead with epoxy resin, and each electrode of the light-emitting element is bonded to the mount lead and the inner lead with a gold wire. Electrical conduction.
- the coating member was formed so that the amount of the photoluminescent phosphor gradually increased as the position became closer to the light emitting element, and then the light emitting element and the photoluminescent fluorescent substance were further formed.
- a translucent epoxy resin was formed as a molding material for the purpose of protecting the body from external stress, moisture, dust, etc.
- the molding member was a shell-shaped mold.
- a lead frame having a photoluminescent phosphor coating formed thereon was inserted, mixed with a translucent epoxy resin, and then cured at 150 ° C. for 5 hours to form a film. When viewed from the front of the luminescence observation, the center of the light emitting diode was colored yellowish by the color of the body of the photoluminescent phosphor.
- the sex index (Ra) was 89.0, and the luminous efficiency was 10 lm / w.
- the changes due to the photoluminescent phosphor were not observed in the tests at room temperature of 60 mA, at room temperature of 20 mA, and at 20 mA at 60 ° C and 90% RH. It was confirmed that there was no.
- Emission peak as an LED element is 470 nm I n e. 4 G a.
- a 6N semiconductor was used.
- the light-emitting device is a TMG (trimethyl Gallium) gas, TM I (trimethylindium) gas, nitrogen gas and dopant gas were flowed together with the carrier gas, and a gallium nitride-based compound semiconductor was formed by MOCVD.
- S i H 4 and C p 2 M g as dopant Bok gas to form the formed PN junction nitride Gariumu semiconductor having a nitrided Gariumu semiconductor and the P-type conductivity having a N type conductivity by switching.
- LED elements include a contact layer, which is a gallium nitride semiconductor having N-type conductivity, a cladding layer, which is a gallium aluminum nitride semiconductor having P-type conductivity, and a gallium nitride semiconductor having P-type conductivity.
- a contact layer was formed.
- Single-well structure by forming a non-doped InGaN active layer with a thickness of about 3 nm between a contact layer having N-type conductivity and a cladding layer having P-type conductivity.
- a gallium nitride semiconductor was formed as a buffer layer on the sapphire substrate at a low temperature.
- the PN semiconductor surfaces were exposed by etching, and the p-side and n-side electrodes were formed by sputtering. After a scribe line was drawn on the semiconductor wafer thus completed, the wafer was divided by external force to form a light emitting device as a light emitting device.
- This light-emitting device was die-bonded to a cup of a silver-plated copper mount lead using an epoxy resin.
- Each electrode of the light-emitting element, the mount lead and the inner lead were each wire-bonded with a gold wire having a diameter of 30 m to establish electrical continuity.
- the mold member is a blue light-emitting diode after inserting a lead frame with a light-emitting element arranged in a shell-shaped mold, mixing translucent epoxy resin, and curing at 150 ° C for 5 hours. Was formed.
- a blue light-emitting diode was connected to one end of an acrylic light guide plate whose end was completely polished.
- One side and side of the acrylic plate are made of barium titanate as a white reflective member in an acryl-based binder.
- the dispersion was screen printed and cured to form a film.
- FIG. 22 A shows the light emitting scan Bae-vector of the phosphor and the light emitting element represented by C e.
- FIG. 23 shows a light emitting spectrum of the light emitting diode of the eleventh embodiment.
- 60 mA at room temperature 20 mA at room temperature
- No change due to the phosphor was observed in each test at a current of 2 O mA at 60 ° C and 90% RH.
- a desired chromaticity point can be maintained even if the wavelength from the light emitting element changes by variously changing the content of the phosphor.
- the light emitting diode of Example 12 was manufactured in the same manner as in Example 1 except that a phosphor not containing A ⁇ represented by the general formula Y 3 I ⁇ 6 0 12 : Ce was used as the photoluminescent phosphor. Thus, 100 light emitting diodes were produced.
- the light-emitting diode of Example 9 exhibited excellent weather resistance similarly to Example 1 in a life test, although the luminance was low.
- the light-emitting diode according to the present invention can emit light having a desired color, has little deterioration in luminous efficiency even when used for a long time at high luminance, and has excellent weather resistance. I have. Therefore, it is not limited to general electronic equipment, but opens up new applications as outdoor display and lighting, such as in-vehicle, aviation industry, port buoy display, and highway sign lighting that require high reliability. be able to.
Description
Claims
Priority Applications (17)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI9710792-1A BR9710792B1 (pt) | 1996-07-29 | 1997-07-29 | dispositivo de emissão de luz, dispositivo de exibição de led e diodo emissor de luz. |
AU36355/97A AU720234B2 (en) | 1996-07-29 | 1997-07-29 | Light emitting device and display |
BRPI9715264A BRPI9715264B1 (pt) | 1996-07-29 | 1997-07-29 | dispositivo de emissão de luz |
BRPI9715363A BRPI9715363B1 (pt) | 1996-07-29 | 1997-07-29 | dispositivo de emissão de luz |
DK97933047T DK0936682T4 (da) | 1996-07-29 | 1997-07-29 | Lysemitterende indretning og display |
BRPI9715262-5A BRPI9715262B1 (pt) | 1996-07-29 | 1997-07-29 | Dispositivo semicondutor emissor de luz azul para emissão na cor branca por meio de luz reemitida por substância fluorescente |
JP50869398A JP3503139B2 (ja) | 1996-07-29 | 1997-07-29 | 発光装置と表示装置 |
BRPI9715364-8A BRPI9715364B1 (pt) | 1996-07-29 | 1997-07-29 | Light emission device, background light source and liquid crystal display |
EP97933047A EP0936682B9 (en) | 1996-07-29 | 1997-07-29 | Light emitting device and display device |
DE1997602929 DE69702929T4 (de) | 1996-07-29 | 1997-07-29 | Lichtemittierende vorrichtung und anzeigevorrichtung |
CA002262136A CA2262136C (en) | 1996-07-29 | 1997-07-29 | Light emitting device and display device |
AT97933047T ATE195831T1 (de) | 1996-07-29 | 1997-07-29 | Licht-emittierende vorrichtung und anzeigevorrichtung |
EP10184754.9A EP2276080B2 (en) | 1996-07-29 | 1997-07-29 | Light emitting device and display |
ES97933047T ES2148997T5 (es) | 1996-07-29 | 1997-07-29 | Dispositivo emisor de luz y dispositivo de pantalla. |
HK00100057A HK1021073A1 (en) | 1996-07-29 | 2000-01-05 | Light emitting device and display device |
GR20000402181T GR3034493T3 (en) | 1996-07-29 | 2000-09-28 | Light emitting device and display device |
HK01100541A HK1030095A1 (en) | 1996-07-29 | 2001-01-22 | Light emitting device and display device |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP19858596 | 1996-07-29 | ||
JP8/198585 | 1996-07-29 | ||
JP24433996 | 1996-09-17 | ||
JP8/244339 | 1996-09-17 | ||
JP24538196 | 1996-09-18 | ||
JP8/245381 | 1996-09-18 | ||
JP8/359004 | 1996-12-27 | ||
JP35900496 | 1996-12-27 | ||
JP9/81010 | 1997-03-31 | ||
JP8101097 | 1997-03-31 |
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WO1998005078A1 true WO1998005078A1 (en) | 1998-02-05 |
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PCT/JP1997/002610 WO1998005078A1 (en) | 1996-07-29 | 1997-07-29 | Light emitting device and display device |
Country Status (19)
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US (25) | US5998925A (ja) |
EP (14) | EP1429398B1 (ja) |
JP (19) | JP3503139B2 (ja) |
KR (7) | KR100491481B1 (ja) |
CN (11) | CN100449807C (ja) |
AT (1) | ATE195831T1 (ja) |
AU (1) | AU720234B2 (ja) |
BR (7) | BR9715365B1 (ja) |
CA (4) | CA2479842C (ja) |
DE (6) | DE29724764U1 (ja) |
DK (9) | DK2197057T3 (ja) |
ES (9) | ES2553570T3 (ja) |
GR (1) | GR3034493T3 (ja) |
HK (12) | HK1021073A1 (ja) |
MY (1) | MY125748A (ja) |
PT (5) | PT1429398E (ja) |
SG (5) | SG10201502321UA (ja) |
TW (2) | TW383508B (ja) |
WO (1) | WO1998005078A1 (ja) |
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