WO2014048773A1 - Optoelektronisches bauelement - Google Patents
Optoelektronisches bauelement Download PDFInfo
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- WO2014048773A1 WO2014048773A1 PCT/EP2013/069040 EP2013069040W WO2014048773A1 WO 2014048773 A1 WO2014048773 A1 WO 2014048773A1 EP 2013069040 W EP2013069040 W EP 2013069040W WO 2014048773 A1 WO2014048773 A1 WO 2014048773A1
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- scattering
- electromagnetic radiation
- converter
- optoelectronic component
- temperature
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0247—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of voids or pores
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0263—Diffusing elements; Afocal elements characterised by the diffusing properties with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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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
-
- 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
-
- 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
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
-
- 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
-
- 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
- H01L33/58—Optical field-shaping elements
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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
Definitions
- Optoelectronic component The invention relates to an optoelectronic component.
- the scattering body is designed to scatter light, wherein the light scattering decreases with increasing temperature. At a temperature of 300 K, the scattering element is only partially permeable to radiation. Only when the temperature rises does the scattering body become transparent.
- the object underlying the invention can be seen to provide an optoelectronic device.
- the object underlying the invention can also be seen to provide a scattering body.
- an optoelectronic component will be riding ⁇ found.
- the component comprises a Halbleiterschich ⁇ ten scenic having an emitter layer for emitting electromagnetic radiation ⁇ .
- a converter is provided which is electromagnetic radiation having a first wavelength, so insbesonde ⁇ re electromagnetic radiation spectrum corresponding to a first optical corresponding to an electromagnetic radiation having a second wavelength, thus in particular in an electromagnetic radiation a second optical spectrum convert can, wherein the second wavelength is different from the first wavelength.
- the optoelectronic component comprises a diffuser for diffusing at least a part of the radiation emitted by the emitter layer electromagnetic radiation in the direction of the converter in order to convert at least a portion of the emit ⁇ oriented electromagnetic radiation.
- the scattering body has a positive temperature-dependent scattering cross-section, so that, as the temperature increases, a scattering of the electromagnetic radiation in the scattering body in the direction of the converter can be increased. That is to say into ⁇ particular that with increasing temperature, the scattering of electromagnetic radiation in the scattering body in the direction of the converter increases. This means in particular that at higher temperatures more electromagnetic radiation in
- the diffuser can be adapted to interact with incident electromagnetic radiation, thus to absorb einfal ⁇ loin electromagnetic radiation mittieren to trans- and to scatter.
- I a + I t + I s 100%.
- I a , I t and I s can be dependent on the temperature.
- a scattering of the electromagnetic radiation in the scattering body can be increased with increasing temperature means, in particular, that the proportion of scattering I s of the scattering body at higher temperatures is greater than the proportion of scattering I s at lower temperatures, the sum of I a , I t and I s at the respective temperature 100% results. This means in particular that the scattering body at higher temperatures, a larger proportion of the electromagnetic Radiation scatters and thus less transmits and absorb ⁇ biert compared to lower temperatures.
- the direction of the converter means here and below that the scattered electromagnetic at least meets a Oberflä ⁇ che of the converter.
- this surface of the converter is arranged transversely to the main radiation direction of the electromagnetic radiation.
- the main radiation direction means here, transversely to the growth direction of the semiconductor layer sequence.
- a scattering body for scattering electromagnetic radiation for an optoelectronic component wherein the scattering body has a positive temperature-dependent scattering cross section, so that with increasing temperature, a scattering of the electromagnetic radiation in the scattering body can be increased.
- a positive temperature-dependent scattering cross-section means that the scattering of the scattering body in the direction of the converter increases as the temperature increases.
- the diffuser scatters more electromagnetic radiation at higher temperatures compared to lower temperatures.
- a temperature increase of at least 25 ° C., 30 ° C. or 40 ° C. and at most 100 ° C., 125 ° C. or 150 ° C. can take place.
- the temperature difference .DELTA. ⁇ between final and initial temperature at least 30 K, 40 K or 50 K and a maximum of 75 K, 80 K, 100 K or 150 K. In opto-electronic devices, it is usually such that they are warmer in operation.
- the converter increasingly converts electromagnetic radiation and thus emits corresponding electromagnetic radiation converted again.
- the converted electromagnetic radiation can then compensate, for example, for gaps or intensity fluctuations of the spectrum of the electromagnetic radiation emitted by means of the emitter layer.
- the converter can, for example, is now less blue or green components complement the spectrum, so that in the overlay ⁇ tion of the two spectra of the emitted Radiation of the emitter layer and the emitted converted radiation of the converter, a color location is achieved, which substantially corresponds to the color location at a temperature which exists before the spectral shift of the spectrum, which is usually the case shortly after the device is put into operation.
- a scattering cross section according to the present invention is especially a measure of the probability that Zvi ⁇ rule of an incident wave radiation, in this case the electromagnetic radiation, and the scattering body has a scattering as Al, an interaction between the electromagnetic
- the scattering cross section is a positive temperature-dependent scattering cross section means, in particular, that the scattering cross section increases with increasing temperature.
- the scattering element for the radiation emitted by means of the emitter layer is transparent at a temperature of 300 K. Only with increasing temperature of the scattering body is due to the increasing scattering cross section only partially transmissive or partially transparent for the emitter by means of the emitter ⁇ emitted radiation or generally for electromagnetic radiation.
- the scattering body has a radiation-transmissive matrix Mate ⁇ rial having a first refractive index and embedded therein scattering particles having a second refractive index
- WO with a difference between the first and the second refractive index with increasing temperature is zuappelbar. That means in particular that the difference between the ers ⁇ th and the second refractive index increases with increasing temperature. That means in particular that the Brechungsinde- xunter Kunststoff between the matrix material and the scattering angles Parti ⁇ with increasing temperature is zuEnglishbar or increases. Because of this property, advantageously special causes the scattering body has a positive temperature-dependent scattering cross-section.
- the scattering particles at a predetermined temperature in particular 300 K, approximately the same refractive index as the matrix material. This advantageously causes no optical contrast between the scattering particles and the matrix material at this temperature. This causes in an advantageous manner that electromagnetic radiation can propagate unhindered through the scattering body and thus can be coupled out.
- the refractive index of the matrix material changes more than that of the scattering particles, so that ei ⁇ ne difference between the refractive indices increases. It is thus advantageous to increased optical scattering.
- the matrix material may be a Sili ⁇ kon.
- the silicone may be, for example, a polysiloxane, a methylene silicone, a phenylene silicone or a silicone-epoxy hybrid material.
- the silicone may also be a silicone from a respective subgroup of the aforementioned types of silicone.
- a refractive index of 1.40 to 1.42 Betra ⁇ gene in a phenylene silicone, a refractive index may for example be greater than 1.41.
- a refractive index of a phenylene silicone may be at most 1.56.
- the phenylene silicones advantageously have increased thermal stability and increased chemical resistance.
- the methylene silicones have good properties, for example mechanical properties, with respect to a Use in health care.
- the methylene silicones can be used because of their good mechanical properties Sheep ⁇ th for encapsulations.
- a converter comprising a matrix material made of a methylene silicone is particularly suitable for encapsulating the optoelectronic component.
- the device is well protected ⁇ be Sonder advantageously from external influences.
- the particulate material ie the material from which the scattering particles are formed, is glass, BaF 2 , LiF or MgF 2 .
- different scattering particles may be embedded in the matrix material.
- the particulate material may be a silicon oxide, silicon dioxide or a metal fluoride.
- a scattering particle size is between 200 ⁇ m and 10,000 ⁇ m, in particular between 200 ⁇ m and 1000 ⁇ m.
- the scattering particles each have the same size or a different size.
- the scattering particles may each have a different shape or a same shape.
- the scattering particles can be distributed homogeneously or inhomogeneously in the scattering body.
- the scattering body is formed as a lens for breaking the non-scattered electromagnetic radiation.
- the scattering body can break down the non-scattered electromagnetic radiation and thus change a beam ⁇ direction in an advantageous manner.
- the scattering body is formed as a converging lens for focusing the non-scattered electromagnetic radiation.
- the scattering body has a convex or biconvex shape as a converging lens. With a corresponding geometric arrangement of the converter relative to the lens, this can also break the converted electromagnetic radiation and focus in the case of the condenser lens.
- the semiconductor layer sequence and the converter are arranged on a common carrier substrate surface adjacent to each other.
- adjacent in the sense of the present inventions dung particular, adjacent means that the converter and the half ⁇ superimposed layers directly adjacent to each other ⁇ are arranged, without a gap between the converter and the semiconductor layer sequence.
- adjacent environmentally summarizes particular the case that the Halbleiter Anlagenenfol- ge and the converter spaced from one another on the carrier substrate surface are arranged so indirectly Benach ⁇ disclosed.
- the semiconductor layer sequence and the converter are each arranged adjacent to one another on a separate carrier substrate surface, ie in particular directly or indirectly adjacent to one another.
- the diffuser is angeord ⁇ net at least on one of the two of the supporting substrate surface opposite respective Oberflä ⁇ surfaces of the semiconductor layer sequence and the converter. That means in particular that the diffuser on the surface of the semiconductor layer sequence of Trä ⁇ gersubstratober Structure opposite, may be disposed.
- the scattering body is arranged on the surface of the Kon ⁇ verters, which overlaps the carrier substrate surface against ⁇ .
- the scattering body is on both the surface of the semiconductor layer sequence, which is opposite to the Suub ⁇ stratober Design, as well as on the surface of the converter, which is opposite to the carrier substrate surface, arranged.
- the above-mentioned and subsequent statements apply regardless of whether the semiconductor layer sequence and the converter are arranged on a common or each on its own carrier substrate surface.
- the surface of the semiconductor layer sequence which is the Trä ⁇ gersubstratober Assembly over, in particular may be referred to as a semiconductor layer sequence surface.
- the surface of the converter, opposite the Shinsubstratoberflä- che, for example, can be referred to as Konverteroberflä ⁇ surface.
- the fact that the scattering body is arranged on the converter surface, is advantageously effected that a large part of the scattered radiation can also reach the converter, which significantly increases efficiency or efficiency.
- the diffuser is as encapsulation on the carrier substrate surface with the semiconductor layer sequence and the provided convergence ⁇ ter. That means in particular that the scattering body encapsulates the carrier substrate surface with the semiconductor layer sequence ⁇ and the converter.
- the scattering body is formed as a protective layer, which is arranged on the respective surfaces of the individual elements.
- the protective layer ⁇ may have a rectangular shape or a semicircular shape.
- the scattering body has a non-scattering region for emitting a minimum intensity of an unconverted electromagnetic radiation.
- the region, which scatters the radiation is particularly referred to as stray Be ⁇ rich.
- several non-scattering regions can be formed which can preferably equal to or preferential ⁇ , be formed differently.
- the non-diffusing region is formed from the matrix material, in which case the matrix material is free from embedded scattering particles. It can preferably be seen upstream, that the non-scattering area is formed of a different ge ⁇ formed from the matrix material of the scattering area matrix material.
- the non-scattering region of at least one of which is arranged at ⁇ the respective surfaces of the semiconductor layer sequence and the converter on. That means in particular that the non-scattering area follow on the surface Halbleiter Anlagenen- and / or angeord ⁇ net on the converter surface.
- the one or more scattering regions are then preference ⁇ arranged on which the non-scattering regions are not disposed on the respective free surfaces.
- a scattering region denotes an area in which scattering can take place.
- the scattering region thus has in particular a positive temperature-dependent scattering cross section.
- the scattering region comprises a matrix material with embedded scattering particles.
- the non-scattering region has, in particular, only one matrix material without embedded scattering particles, and is therefore free of scattering particles.
- multiple scattering preparation ⁇ surface are formed, which may be formed un ⁇ differently in particular equal to or preferably.
- the emitter layer is formed as a converter layer for converting electromagnetic radiation having a third wavelength in electromagnetic radiation having a direction different from the drit ⁇ th wavelength fourth wavelength, and that the semiconductor layer sequence, an active region for generating electromagnetic radiation, which is at least partially convertible by means of the converter layer .
- averaging a Primärstrah- is gebil ⁇ det in the active zone of the semiconductor layer sequence, which prior to radiation from the optoelectronic device, at least partially, in particular completely, with ⁇ means of the converter layer is converted.
- the active zone produces ultraviolet to blue light, which is then in the converter layer, at least partially, in particular completely, is converted ⁇ converts into green light.
- one wavelength of the converged radiated radiation be greater than a wavelength of the primary radiation.
- Ultraviolet purposes of the present invention refers particularly to a wavelength range between 230 nm and 400 nm.
- an active region a Kon verter für ⁇ , a converter and / or an emitter layer depending ⁇ wells diamond (C), aluminum nitride (A1N), Aluminiumgallium ⁇ nitride (AlGaN), aluminum gallium indium nitride (AlGalnN) or a combination of the aforementioned materials.
- Violet in the context of the present invention refers to a wavelength range between 400 nm and 450 nm in particular ⁇ sondere. Violet can especially denote only the wavelength of 450 nm.
- an active zone, a converter layer, a converter and / or an emitter layer may then each comprise indium gallium nitride (InGaN).
- Blue in the sense of the present invention means in particular a wavelength range between 450 nm and 500 nm.
- an active region, a converter ⁇ layer, a converter and / or an emitter layer are each zinc selenide (ZnSe), indium gallium nitride (InGaN), Siliziumkar ⁇ bid (SiC), zinc oxide (ZnO), silicon (Si) as a carrier or a combination of the aforementioned materials.
- Green in the sense of the present invention refers in particular to a wavelength range between 500 nm and 570 nm.
- an active zone, a converter layer, a converter and / or an emitter layer can then each
- GaN gallium nitride
- GaP gallium phosphide
- AlGalnP aluminum gallium indium phosphide
- AlGaP aluminum gallium phosphide
- ZnO zinc oxide
- Yellow in the sense of the present invention particularly denotes a wavelength range between 570 nm and 590 nm.
- an active zone, a converter ⁇ layer, a converter and / or an emitter layer each comprise gallium arsenide phosphide, aluminum gallium indium phosphide (AlGalnP), gallium phosphide (GaP) or a combination of the aforementioned materials.
- Orange for the purposes of the present invention refers in particular ⁇ sondere a wavelength range between 590 nm and 610 nm.
- an active region, a Converter layer, a converter and / or an emitter layer, respectively GaAsP, AlGaInP, GaP or a combination of the aforementioned materials include.
- Red in the context of the present invention means in particular a wavelength range between 610 nm and 760 nm.
- an active region, a converter ⁇ layer, a converter and / or an emitter layer each aluminum gallium arsenide (AlGaAs), gallium arsenide phosphide ( GaAsP), aluminum gallium indium phosphide (AlGalnP), gallium phosphide or a combination of the aforementioned materials.
- Infrared in the sense of the present invention refers in particular ⁇ a wavelength range greater than 760 nm.
- an active zone, a converter ⁇ layer, a converter and / or an emitter layer each comprise AlGaAs, GaAs or a combination of the aforementioned materials. If it is above or below generally written by a wavelength, so this wavelength can, in particular in a wavelength range from ultraviolet to infrared lie ⁇ gen.
- the active zone is formed, electromagnetic radiation in a wavelength range of 230 nm to 500 nm, in particular from 400 nm to 500 nm, preferably 450 nm to 500 nm.
- the converter layer is configured to convert at least a portion of the generated radiation into electromagnetic radiation in a wavelength range of 500 nm to 570 nm.
- the con verter ⁇ is adapted to convert by means of the converter layer Conver ⁇ oriented radiation into electromagnetic radiation having a wavelength greater than 610 nm.
- the green radiation is then converted into red radiation.
- a color locus shift to reddish can be compensated in an advantageous way.
- a plurality of converters may be formed.
- the converters can preferably be identical or in particular formed differently.
- FIG. 1 shows an optoelectronic component
- FIG. 2 shows a color locus shift
- Figures 3 and 4 spectra of various dyes which can be used for emitter layers, converters, converter layers and active areas and accordingly Matterla ⁇ siege spectra;
- FIG. 5 shows an RGB system
- Figures further RGB systems
- 9 shows a comparison of two color location shifts in a known optoelectronic component and at a ⁇ OF INVENTION to the invention the optoelectronic component;
- FIG. 11 shows a spectral shift in an optoelectronic component according to the invention
- FIG. 13 shows a graph of a dependence of the refractive index of silicone on a wavelength. Below may be used for the same features same bootsszei ⁇ chen.
- FIG. 1 shows an optoelectronic component 101.
- the optoelectronic device 101 includes a semiconductor layer sequence ⁇ 103 comprising a plurality of layers 103a, 103b and 103c.
- the semiconductor layer 103b is between the two Semiconductor layers 103a and 103c formed and disposed immediately adjacent thereto.
- the semiconductor layer 103b is formed as a Emit ⁇ ter Mrs 105 in the optoelectronic component one hundred and first This means, in particular, that the emitter layer 105 is designed to emit electromagnetic radiation.
- vorgese ⁇ hen may be preferably that the two semiconductor layers 103a and 103c n- and p-doped semiconductor layers.
- the emitter layer 105 emits the electromagnetic radiation 107, which is indicated symbolically in FIG. 1 by means of an arrow with the reference symbol 107.
- the emitted electromagnetic radiation 107 reaches ⁇ at least partially a scattering body 109.
- the scattering body 109 scatters at least a portion of the means of the emitter layer
- the converter 113 converts the scattered electromagnetic ⁇ specific radiation 111 into an electromagnetic radiation, which at least partially has a different wavelength range than the scattered radiation 111.
- the converted electromagnetic radiation, which is then radiated from the converter 113 is symbolically in Figure 1 with a Arrow indicated by the reference numeral 115.
- the scattering body 109 has a positive temperature-dependent scattering cross-section, so that, as the temperature increases, a scattering of the electromagnetic radiation in the scattering body 109 in the direction of the converter 113 increases. This means in particular that, as a temperature increases, the scattering in the scattering body 109 increases, so that increased electromagnetic radiation in the direction of Converter 113 is scattered. This means, in particular, that when the temperature rises, a proportion of the electromagnetic radiation 107 emitted by means of the emitter layer 105 is converted by the converter 113.
- the scattering body 109 is transparent at room temperature, in particular at 300 K, for the emitted electromagnetic radiation 107 of the emitter layer 105. Only with increasing temperature, thus, for example, during operation of the optoelectronic component
- the scattering cross section is in the scattering body 109 increas ⁇ men, so that then propagated light or electromagnetic radiation in the direction of the converter is scattered 113th
- the emitter layer 105 is formed as a converter layer and is preferably arranged on top of the semiconductor layer sequence 103 as the last semiconductor layer.
- an active zone is then preferably provided, which is likewise electromagnetic
- the active region emits blue light, in which case the converter layer is formed into ⁇ particular, to convert the blue light into green light. This green light is then scattered in particular at least partially by the scattering body 109 in the direction of the converter 113. It is then preferably provided that the converter 113 is designed to convert the green light into red light.
- the converter 113 may have a phosphorus compound.
- opto-electronic construction ⁇ elements such as light-emitting diodes
- an active zone or a Emit ⁇ ter Mrs of the optoelectronic component is usually ambient temperature, for example room temperature, for example 300 K.
- the duration is for example depending on the thermal resistance of the optoelectronic component and, in particular depend on a coupling
- a temperature of the active zone or the emitter layer increases. This is achieved as long to üb ⁇ SHORT- a stable temperature in a stationary operating point. This process takes place in the rule ⁇ case in a period of the first 10 to 30 minutes after switching off.
- the temperature is usually between about 75 ° C and 125 ° C, wherein in the stationary operating point, the temperature may also be, for example, above 150 ° C.
- Radiation flux typically in particular as a function of the temperature, in particular in the presence of a constant, temperature-independent current.
- Higher Anlagentemperatu ⁇ ren usually lead to a decrease in the luminous flux.
- ⁇ is a luminous flux at 100 ° C usually examples spielswe.LSG kang. 85% of the luminous flux at 25 C.
- this effect is usually more pronounced, especially because the emission wavelength shifts out of a range of higher Au ⁇ genarikeit. So can one at
- InGaAlP in the yellow spectral range emitting semiconductor layer sequence the brightness at 100 ° C to about 40% of the value at 25 ° C drop. In the case of emission in the red wavelength range, this drop may amount to approximately 50%, based on the brightness perceived by the human eye.
- This temperature dependence of the luminous flux can cause in appli ⁇ applications problems. For example, with flashing lights or taillights in the automotive sector, a certain, predetermined luminous flux is usually reached.
- the correlated color temperature changes by 600 K from about 2400 K at room temperature to 3000 K at the stationary operating point of the optoelectronic component at about 100 ° C. So it turns reddish after turning on
- Figure 2 shows graphically shown the above-explained Far ⁇ bortverschiebung by luminous flux in a red light-emitting semiconductor layer sequence.
- the two lower graphs show the spectrum emitted in this case of a system comprising a red, blue and green-emitting semiconductor layer sequence ⁇ with corresponding emitter layers and optionally active zones with associated converter layer.
- the left graph shows the situation at a temperature of 25 ° C.
- the right graph shows the situation with ei ⁇ ner temperature of 100 ° C.
- the intensity is plotted in watts per nanometer over the wavelength in nanometers.
- the color space is drawn in, which is in particular the RGB (red, green, blue) color space. Above these two spectra, another spectrum is shown.
- the Intensi ⁇ ty is also plotted in watts per nanometer versus wavelength in nanometers.
- the curve labeled 201 identifies the case at a temperature of 25 ° C.
- the curve with the reference numeral 203 shows the case at a temperature of
- FIGS. 3 and 4 each show different spectra of different dyes, which can be used for emitter layers, active zones, converters and converter layers. Also plotted are correspondingly superimposed spectra, which result from the superimposition of the individual spectra. The intensity in watts per nanometer is plotted over the wavelength in nanometers. The respective curve with the reference numerals 305 and 401 indicate ⁇ draws a spectrum of a YAG dye.
- the respective curve with the reference numerals 307 and 405 indicate ⁇ draws a spectrum for a dye-based LuAG green mixed with the spectrum 305, respectively, four hundred and first
- the curve labeled 403 indicates a spectrum of LuAG-based green dye.
- the curve designated by reference numeral 301 denotes a spectrum of a YaG-based green-yellow dye mixed with a spectrum of a dye mainly emitting in orange (for example, at a maximum at 606 nm) or red.
- the curve labeled 303 denotes a spectrum mixed from the spectrum 307 with a spectrum of the predominantly orange (eg, maximum at 606 nm) or red emitting dye.
- FIG. 5 shows an RGB system 500.
- RGB stands for red, green and blue. Such a system usually comprises a red electromagnetic radiation, electromagnetic radiation, blue and green electromagnetic ⁇ specific radiation-emitting optoelectronic component, so that in superposition of red, blue and green, a certain color location or a certain color temperature, such as white light results.
- the RGB system 500 includes three opto-electronic devices 501, 503 and 505. Each of the three optoelectronic Bauele ⁇ elements 501, 503 and 505 includes a support substrate 507 on.
- the three optoelectronic components are preferably also disclosed individually.
- the optoelectronic component 503 is open ⁇ revealed itself al ⁇ lein without the other two elements 501 and 505 to ⁇ special.
- the components 501, 503, 505 are each drawn twice in each case one above the other in two rows.
- the upper row be ⁇ writes the case at a temperature of 25 ° C.
- the lower row describes the case at a temperature of 90 ° C. on a carrier substrate surface 507a of the optoelectronic ⁇ rule component 501 and the optoelectronic component 505 is in each case a Ti02- Silicone layer 509 applied.
- a lens 515 is applied comprising a konve ⁇ xe form respectively.
- the lens 515 comprises a silicone as the material.
- the component 501 emits blue light.
- the device 505 emits red light.
- red light due to an increasing temperature, there will usually be a drop in luminous flux in the device 505 emitting red light.
- arrows which are identified by the reference numeral 519.
- the reference numeral 517 denotes arrows with respect to the component 501 intended to represent the emission of blue light.
- the optoelectronic component 503 has the Stromsub ⁇ stratober Structure 507a a blue light emitting active region 521, on which a layer is applied converter 523 may convert the blue light from the active region 521 in green light on. The then emitted green light is here marked with arrows, which are identified by the reference numeral 527.
- the converter ⁇ layer 523 may comprise a LuAG Ceramic converter material.
- the two converters 529 have a phosphorus connection, which ensures that the converters 529 can convert the green light 527 into roo tes light when the green light 527 reaches them.
- a scattering body 525 is arranged, which here is preferably designed as a converging lens, having a convex shape.
- a scattering body 525 is arranged on the converters 529 and on the converter layer 523, which here is preferably designed as a converging lens, having a convex shape.
- other shapes for the scattering body are possible. This therefore means in particular that the embodiment described in FIG. 5 is not intended to be limited to collecting lenses having a convex shape.
- the converging lens 525 has a positive temperature-dependent scattering cross section, so that with increasing temperature of the scattering body 525, so here the convergent lens, can scatter light.
- This therefore advantageously results in the operation of the opto ⁇ electronic component 503, that the green light 527 is ver ⁇ strength scattered, and preferably in the direction of the converter 529th These convert so increasingly with increasing temperature, the green light 527 in red light , which is then emitted by the converters 529.
- the converted light is indicated here by arrows with the reference numeral 531. This is exemplified here at a temperature of 90 ° C.
- This converted red light 531 compensates for the loss of red light 519 that the optoelectronic device 505 has. That means in particular that a decline of the emission from the optoelectronic device 505, which emits directly ro ⁇ tes light, can be compensated by an additional emission of the green-red converted light 531 of the optoelectronic component 503rd
- a simple optical Kom ⁇ pensation of Farbortdrifts or the color location shift can be achieved by converting amplified into red light 531 at least partially or with increasing temperature for a temperature-activated diffusion, namely, by the diffuser 525, the green light 527 , Characterized so in an advantageous manner, the loss of red light by thermal quenching processes in the device 505 is compensated for by means of a ⁇ n ⁇ alteration of the red-green ratio, whereby the color locus 500 can be stabilized in the off-blasted total spectrum of the RGB system.
- the scattering body 525 preferably comprises as the matrix material a silicone in which scattering particles, for example SiO 2, are embedded.
- the scattering particles have at room temperature ⁇ , especially at 300 K, about the same Bre ⁇ chung index to as the matrix material, in this example, silicone.
- the RGB system 600 according to FIG. 6 has a carrier substrate 507.
- various semiconductor layers or semiconductor layer sequences are applied as follows:
- a converter 529 Seen firstly from left to right relative to a top view, first a converter 529 is applied, to the right of the converter 529 the active blue zone 511 being applied.
- the system 600 emits both blue and red as well as green light insofar as the blue light of the zone 521 is converted into green light by means of the converter layer 523.
- the scattering body 525 is formed analogously to the scattering body 525 according to FIG. Explanations made with regard to the temperature-dependent scattering in connection with the system 500 according to FIG. 5 apply analogously to the RGB system 600 according to FIG. 6.
- the active zone 513 comprises InGaAlP.
- the active zone 521 and the active Zo ⁇ ne 511 may preferably include InGaN.
- the converters 529 preferably comprise a phosphorus compound.
- FIG. 7 shows a further RGB-system 700 which is constructed in Wesent ⁇ union analogous to the RGB system 600 of FIG. 6 Reference may be made to the corresponding explanations.
- the scattering body 525 in FIG. 7 has two non-scattering regions 701 and one scattering region 703.
- the region 703 has a positive temperature-dependent scattering cross section.
- the two non-scattering regions 701 are transpa rent ⁇ for the emitted electromagnetic radiation.
- the scattering region 703 is formed above the converter layer 523.
- the region 703 has a rectangular shape in the sectional view and has a width equal to the width of the converter layer 523. Left and right next to the scattering region 703, the two non-scattering regions 701 are arranged.
- the scattering region 703 has both a matrix material, for example silicone, and scattering ⁇ particle, for example silicon dioxide.
- the non-scattering regions 701 preferably have single ⁇ Lich a matrix material, such as silicone, and are far as free of scattering particles. So they are in particular scattered particles free.
- the matrix material of the scattering region, and the matrix material of not scatter ⁇ the range of the same material can, for example, dialkyl kylpoylsiloxan be formed.
- by scattering and non-scattering area both have the Mat ⁇ rixmaterialien in the same chemical composition.
- FIG. 8 shows another RGB system 800.
- the RGB system 800 is essentially constructed analogously to the RGB system 700 according to FIG. Reference may be made to the corresponding explanations.
- the non-scattering regions and the scattering regions are reversed in their geometric arrangement. That means in particular that the scattering region 703 to the left and right extending ⁇ rich or from the non-scattering Be 701 is arranged. So that means the ⁇ special is that the non-scattering area 701 extends above the converter layer 523rd
- FIG. 9 shows a comparison between a color locus shift in a known optoelectronic component and an optoelectronic component according to the invention.
- Reference numeral 901 denotes the position which the color locus of the respective optoelectronic component has at a temperature of 25 ° C.
- the reference numeral 903 the position is marked, which has the color locus of he ⁇ inventive optoelectronic component at a temperature of 90 ° C. That means in particular that this optoelectronic component has a diffuser with ei ⁇ nem positive temperature-dependent scattering cross-section and a correspondingly disposed converter.
- Reference numeral 905 denotes the position of a Far ⁇ Borts at a temperature of 90 ° C in an optoelectronic component according to the prior art, in which no compensation of the color location shift has taken place.
- FIG. 10 shows a spectral shift
- the intensity in watts per nanometer is plotted over the wavelength in nanometers.
- the reference numeral 1001 denotes the spectrum of a red light-emitting semiconductor layer sequence at a Tempe ⁇ temperature of 25 ° C.
- Reference numeral 1003 denotes the corresponding spectrum at a temperature of 90 ° C. It is clearly recognizable due to the increased temperature Shifting the spectrum, which leads to a corresponding color locus shift.
- FIG. 11 shows a spectral shift in an optoelectronic component according to the invention.
- Reference numeral 1101 denotes the spectrum of the red
- the reference numeral 1103 denotes the ent ⁇ speaking spectrum at a temperature of 90 ° C.
- the GroE compared to the spectral shift in accordance with Figure 10 ßere shift towards red in some wavelength preparation ⁇ chen stirred especially therefore that an increased Phos ⁇ phorkonzentration is provided in the converter here.
- FIG. 12 shows absorption curves of various red phosphors.
- the region labeled 1201 indicates the wavelength range in which LuAG preferentially absorbs photons. This is especially a green wavelength range here.
- Reference numerals 1203 and 1205 indicate corresponding absorption curves for 2 possible phosphorus compounds.
- Such phosphorus compounds may include, for example, Eu doped CaAlSiN.
- FIG. 13 shows a dependence of a refractive index of a silicone over a wavelength.
- the reference numeral 1301 denotes the course at a temperature of 25 ° C.
- Reference numeral 1303 denotes the course at a temperature of 120 ° C.
- n denotes the refractive index
- a refractive index of silicon dioxide is 1.4600.
- the refractive index of silicone at a temperature of 25 ° C is 1.410.
- a refractive index difference is 0.05.
- a refractive index of silica is 1.4595.
- a refractive index of Silicon at ei ⁇ ner temperature of 125 ° C is 1.377.
- a refractive index difference at a temperature of 125 ° C is 0.0825.
- the refractive index difference increases with increasing temperature.
- the silicone it is preferable to provide polysiloxane or subgroups.
- methylene side groups may be provided, in particular phenylene side groups may be provided.
- the converter layer 523 which converts red light into green light, has a thickness of between 50 ym and 400 ym.
- a thickness of the converters 529 that convert green light to red light is between 100 ym and 500 ym.
- a weight concentration of phosphorus or phosphorus compound in the converter 529 may be between 5% by weight (weight percent) and 80% by weight.
- SiO 2 can be provided as matrix particles, for example.
- a particle size can be between 200 ym and 10,000 ym.
- the scattering particles here for example, the silica may be gebil- det with adjusted refractive index, for example, as milled glass, in particular Gemah ⁇ lenes glass. So that means that glass can be ground to make these scattering particles.
- the invention particularly includes the idea of providing a scattering body having a positive temperature-dependent scattering cross-section, which increases electromagnetic radiation in an increasing temperature Direction of a converter scatters, so that the scattered light can then be converted by the converter.
- a color locus shift can therefore advantageously be compensated, for example.
- it requires no complex electrical control for a compensation of a color location shift, resulting in lower costs and a lower cost in the production.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112013004762.4T DE112013004762A5 (de) | 2012-09-27 | 2013-09-13 | Optoelektronisches Bauelement |
US14/430,202 US9459383B2 (en) | 2012-09-27 | 2013-09-13 | Optoelectronic device |
US15/255,068 US20160370513A1 (en) | 2012-09-27 | 2016-09-01 | Optoelectronic device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012217643.8A DE102012217643A1 (de) | 2012-09-27 | 2012-09-27 | Optoelektronisches Bauelement |
DE102012217643.8 | 2012-09-27 |
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US14/430,202 A-371-Of-International US9459383B2 (en) | 2012-09-27 | 2013-09-13 | Optoelectronic device |
US15/255,068 Division US20160370513A1 (en) | 2012-09-27 | 2016-09-01 | Optoelectronic device |
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WO2014048773A1 true WO2014048773A1 (de) | 2014-04-03 |
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PCT/EP2013/069040 WO2014048773A1 (de) | 2012-09-27 | 2013-09-13 | Optoelektronisches bauelement |
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US (2) | US9459383B2 (de) |
DE (2) | DE102012217643A1 (de) |
WO (1) | WO2014048773A1 (de) |
Families Citing this family (7)
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DE102014100991A1 (de) | 2014-01-28 | 2015-07-30 | Osram Opto Semiconductors Gmbh | Lichtemittierende Anordnung und Verfahren zur Herstellung einer lichtemittierenden Anordnung |
BR102016004795B1 (pt) | 2015-03-05 | 2021-09-08 | Nichia Corporation | Diodo emissor de luz |
EP3273850B1 (de) * | 2015-03-23 | 2021-11-24 | Koninklijke Philips N.V. | Optischer lebenszeichensensor |
US10761246B2 (en) * | 2017-12-22 | 2020-09-01 | Lumileds Llc | Light emitting semiconductor device having polymer-filled sub-micron pores in porous structure to tune light scattering |
JP7224355B2 (ja) * | 2017-12-22 | 2023-02-17 | ルミレッズ リミテッド ライアビリティ カンパニー | 光散乱を調整するための多孔質のミクロン・サイズの粒子 |
FR3083371B1 (fr) * | 2018-06-28 | 2022-01-14 | Aledia | Dispositifs émetteurs, écran d'affichage associé et procédés de fabrication d'un dispositif émetteur |
DE102018125138A1 (de) * | 2018-10-11 | 2020-04-16 | Osram Opto Semiconductors Gmbh | Strahlungsemittierendes bauteil und verfahren zur herstellung eines strahlungsemittierenden bauteils |
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US20090268273A1 (en) * | 2008-04-23 | 2009-10-29 | Ravenbrick Llc | Glare Management of Reflective and Thermoreflective Surfaces |
EP2113949A2 (de) * | 2008-05-02 | 2009-11-04 | Cree, Inc. | Verkapselung für phosphorkonvertierte weißlichtemittierende Diode |
WO2012022628A1 (de) | 2010-08-20 | 2012-02-23 | Osram Opto Semiconductors Gmbh | Optoelektronisches halbleiterbauteil und streukörper |
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US6429583B1 (en) * | 1998-11-30 | 2002-08-06 | General Electric Company | Light emitting device with ba2mgsi2o7:eu2+, ba2sio4:eu2+, or (srxcay ba1-x-y)(a1zga1-z)2sr:eu2+phosphors |
JP2005310756A (ja) * | 2004-03-26 | 2005-11-04 | Koito Mfg Co Ltd | 光源モジュールおよび車両用前照灯 |
TWI280673B (en) * | 2004-09-22 | 2007-05-01 | Sharp Kk | Optical semiconductor device, optical communication device, and electronic equipment |
KR101562772B1 (ko) * | 2008-03-31 | 2015-10-26 | 서울반도체 주식회사 | 백열등 색의 발광 디바이스 |
DE102010038396B4 (de) * | 2010-07-26 | 2021-08-05 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Optoelektronisches Bauelement und Leuchtvorrichung damit |
DE102010054280A1 (de) * | 2010-12-13 | 2012-06-14 | Osram Opto Semiconductors Gmbh | Verfahren zum Erzeugen einer Lumineszenzkonversionsstoffschicht, Zusammensetzung hierfür und Bauelement umfassend eine solche Lumineszenzkonversionsstoffschicht |
TW201226530A (en) * | 2010-12-20 | 2012-07-01 | Univ Nat Chiao Tung | Yellow phosphor having oxyapatite structure, preparation method and white light-emitting diode thereof |
DE102011009697A1 (de) * | 2011-01-28 | 2012-08-02 | Osram Opto Semiconductors Gmbh | Leuchtmodul zur Abstrahlung von Mischlicht |
DE102011085645B4 (de) * | 2011-11-03 | 2014-06-26 | Osram Gmbh | Leuchtdiodenmodul und Verfahren zum Betreiben eines Leuchtdiodenmoduls |
-
2012
- 2012-09-27 DE DE102012217643.8A patent/DE102012217643A1/de not_active Withdrawn
-
2013
- 2013-09-13 US US14/430,202 patent/US9459383B2/en not_active Expired - Fee Related
- 2013-09-13 DE DE112013004762.4T patent/DE112013004762A5/de not_active Withdrawn
- 2013-09-13 WO PCT/EP2013/069040 patent/WO2014048773A1/de active Application Filing
-
2016
- 2016-09-01 US US15/255,068 patent/US20160370513A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20090268273A1 (en) * | 2008-04-23 | 2009-10-29 | Ravenbrick Llc | Glare Management of Reflective and Thermoreflective Surfaces |
EP2113949A2 (de) * | 2008-05-02 | 2009-11-04 | Cree, Inc. | Verkapselung für phosphorkonvertierte weißlichtemittierende Diode |
WO2012022628A1 (de) | 2010-08-20 | 2012-02-23 | Osram Opto Semiconductors Gmbh | Optoelektronisches halbleiterbauteil und streukörper |
Also Published As
Publication number | Publication date |
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US9459383B2 (en) | 2016-10-04 |
DE112013004762A5 (de) | 2015-07-02 |
US20160370513A1 (en) | 2016-12-22 |
DE102012217643A1 (de) | 2014-03-27 |
US20150346397A1 (en) | 2015-12-03 |
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