WO1997050132A1 - Lichtabstrahlendes halbleiterbauelement mit lumineszenzkonversionselement - Google Patents
Lichtabstrahlendes halbleiterbauelement mit lumineszenzkonversionselement Download PDFInfo
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- WO1997050132A1 WO1997050132A1 PCT/DE1997/001337 DE9701337W WO9750132A1 WO 1997050132 A1 WO1997050132 A1 WO 1997050132A1 DE 9701337 W DE9701337 W DE 9701337W WO 9750132 A1 WO9750132 A1 WO 9750132A1
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- light
- semiconductor component
- component according
- luminescence conversion
- conversion element
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Definitions
- the invention relates to a light-emitting semiconductor component according to the preamble of claim 1.
- Such a semiconductor component is known, for example, from published patent application DE 38 04 293.
- the light emitted by the arrangement therefore has a different color than that emitted by the light-emitting diode.
- one and the same type of light emitting diode can be used to produce light emitting diode arrangements that shine in different colors.
- an infrared (IR) solid-state lamp in which phosphor material is attached to the edge of an IR diode and converts the IR radiation emitted there into visible light.
- the aim of this measure is to
- a light-emitting diode is known from EP 486 052, in which at least one semiconductor photoluminescent layer is arranged between the substrate and an active electroluminescent layer, which layer emits the light of a first emitted by the active layer towards the substrate Converts wavelength range into light of a second wavelength range, so that the light-emitting diode emits light of different wavelength ranges overall.
- JP-07 176 794-A describes a planar light source which emits white light and in which two blue light-emitting diodes are arranged on an end face of a transparent plate and emit light into the transparent plate.
- the transparent plate is coated on one of the two opposite main surfaces with a fluorescent substance which emits light when it is excited with the blue light from the diodes.
- the light emitted by the fluorescent substance has a different wavelength than the blue light emitted by the diodes.
- the reproducibility in mass production causes great problems, because even slight fluctuations in the thickness of the fluorescent layer, e.g. B. due to unevenness in the surface of the transparent plate, causes a change in the white tone of the emitted light.
- the present invention is based on the object of developing a semiconductor component of the type mentioned at the outset which emits homogeneous mixed-colored light and which ensures technically simple mass production with largely reproducible component characteristics.
- This object is achieved by a semiconductor component according to claim 1.
- Advantageous developments of the invention are the subject matter of subclaims 2 to 27.
- Subclaims 28 to 30 indicate preferred uses of the semiconductor component according to the invention.
- the radiation-emitting semiconductor body has a layer sequence, in particular a layer sequence with an active semiconductor layer made of Ga ⁇ N ⁇ N or GaAl ⁇ N, which, when the semiconductor component is in operation, emits electromagnetic radiation of a first wavelength range from the ultraviolet range , blue and / or green spectral range.
- the luminescence conversion element converts part of those originating from the first wavelength range
- Radiation in radiation of a second wavelength range in such a way that the semiconductor component emits mixed radiation, in particular mixed-colored light, consisting of radiation of the first wavelength range and radiation of the second wavelength range.
- the luminescence conversion element selectively spectrally selectively absorbs a portion of the radiation emitted by the semiconductor body only over a spectral sub-range of the first wavelength range and emits it in the longer-wavelength range ⁇ in the second wavelength range).
- the radiation emitted by the semiconductor body preferably has a relative intensity maximum at a wavelength ⁇ ⁇ 520 nm and the wavelength range spectrally selectively absorbed by the luminescence conversion element lies outside this intensity maximum.
- the invention can also advantageously be used to convert a number (one or more) of first spectral subregions originating from the first wavelength region into a plurality of second wavelength regions. That’s it advantageously possible to produce a variety of color mixtures and color temperatures.
- the semiconductor component according to the invention has the particular advantage that the wavelength spectrum generated by luminescence conversion and thus the color of the emitted light do not depend on the level of the operating current through the semiconductor body. This is particularly important when the ambient temperature of the semiconductor component and consequently, as is known, also the operating current fluctuate greatly. Light-emitting diodes with a semiconductor body based on GaN are particularly sensitive in this regard.
- the semiconductor component according to the invention requires only a single control voltage and thus also only a single control circuit arrangement, as a result of which the component expenditure for the control circuit of the semiconductor component can be kept very low.
- a partially transparent, that is to say, a luminescence conversion element is arranged above or on the semiconductor body.
- a luminescence conversion layer which is partially transparent to the radiation emitted by the radiation emitting semiconductor body is provided.
- the luminescence conversion layer is advantageously designed such that it has a constant thickness throughout. This has the particular advantage that the path length of the light emitted by the semiconductor body through the luminescence conversion layer for everyone
- a further particular advantage of a semiconductor component according to the invention in accordance with this development consists in the fact that a high producibility can be achieved, which is essential for efficient mass production.
- a luminescence conversion layer for example, a lacquer or resin layer mixed with phosphor can be provided.
- Another preferred embodiment of the semiconductor component according to the invention has as the luminescence conversion element a partially transparent luminescence conversion envelope which encloses at least a part of the semiconductor body (and possibly partial areas of the electrical connections) and at the same time can be used as a component envelope (housing).
- the advantage of a semiconductor component in accordance with this embodiment is essentially that conventional production lines used for the production of conventional light-emitting diodes (for example radial light-emitting diodes) can be used for its production.
- the transparent plastic used for this in conventional light-emitting diodes the material of the luminescence conversion envelope is used for the component envelope.
- the luminescence conversion layer or the luminescence conversion envelope consists of a transparent material, eg B. plastic, preferably epoxy resin, which is provided with at least one phosphor (examples of preferred plastics and phosphors can be found below).
- a transparent material eg B. plastic, preferably epoxy resin, which is provided with at least one phosphor (examples of preferred plastics and phosphors can be found below).
- the or the second wavelength ranges have substantially longer wavelengths than the first wavelength range.
- a second spectral sub-range of the first wavelength range and a second wavelength range are complementary to one another.
- mixed-colored, in particular white, light can be generated from a single colored light source, in particular a light-emitting diode with a single semiconductor body that emits blue light.
- a blue light-emitting semiconductor body part of the radiation emitted by the semiconductor body is converted from the blue spectral range into the yellow spectral range complementary to blue.
- the color temperature or color location of the white light can be varied by a suitable choice of the luminescence conversion element, in particular by a suitable choice of the phosphor, its particle size and its concentration.
- luminescence conversion elements can be made inhomogeneous, e.g. B. by means of an inhomogeneous phosphor distribution. Different path lengths of the light through the luminescence conversion element can thereby advantageously be compensated for.
- the luminescence conversion element or another component of a component casing for color matching has one or more dyes which do not cause any wavelength conversion.
- the dyes used for the production of conventional light emitting diodes such as. B. azo, anthraquinone or perinone dyes are used.
- at least part of the surface of the semiconductor body is covered by a first, eg. B. surrounded by a plastic transparent shell on which the luminescence conversion layer is applied. As a result, the radiation density in the luminescence conversion element and thus its radiation exposure is reduced, which, depending on the materials used, has a positive effect on the service life of the luminescence conversion element.
- a radiation-emitting semiconductor body in which the emitted radiation spectrum at a wavelength between 420 nm and 460 nm, in particular at 430 nm (eg semiconductor body on the Base of Ga ⁇ l ⁇ N) or 450 nm (e.g. semiconductor body based on Ga ⁇ n- t ⁇ N) has an intensity maximum.
- the radiation-emitting semiconductor body can essentially consist of electroluminescent semiconductor material, but also of another electroluminescent material, such as polymer material.
- the luminescence conversion coating or the luminescence conversion layer is made from a lacquer or from a plastic, for example from a silicone, thermoplastic or thermoset material used for the coating of optoelectronic components ( Epoxy and acrylic resins).
- z. B. made of thermoplastic materials as luminescence conversion Um- cover inserted. All of the above materials can easily be mixed with one or more phosphors.
- a semiconductor component according to the invention can be implemented particularly easily if the semiconductor body is arranged in a recess in an optionally prefabricated housing and the recess is provided with a cover element having the luminescence conversion layer.
- a semiconductor component can be manufactured in large numbers in conventional production lines.
- the cover element for example a lacquer or cast resin layer or a prefabricated cover plate made of thermoplastic material, must be applied to the housing.
- the recess of the housing can optionally be filled with a transparent material, for example a transparent plastic, which in particular does not change the wavelength of the light emitted by the semiconductor body or, if desired, can already be configured to convert luminescence .
- the semiconductor body is arranged in a recess in a possibly prefabricated housing which may have already been provided with a leadframe and the recess is filled with an at least partially transparent casting resin which the phosphor already contains is added before pouring the recess.
- the luminescence conversion element is thus provided with the encapsulation of the semiconductor body provided with phosphor.
- a particularly preferred material for producing the luminescence conversion element is epoxy resin, to which one or more Phosphors are added.
- epoxy resin polymethyl methacrylate (PMMA) can also be used.
- PMMA can easily be mixed with organic dye molecules.
- z. B. perylene-based dye molecules can be used.
- Semiconductor components shining in the UV, in the visible or in the infrared can also be produced by admixing 4f organometallic compounds.
- red-shining semiconductor components according to the invention can, for. B. by admixing Eu 3+ based organometallic chelates ( ⁇ «620 nm).
- Infrared-emitting semiconductor components according to the invention in particular with semiconductor bodies emitting blue light, can be produced by adding 4f chelates or Ti 3+ -doped sapphire.
- a semiconductor component according to the invention which emits white light can advantageously be produced by selecting the phosphor so that blue radiation emitted by the semiconductor body into complementary wavelength ranges, in particular blue and yellow, or to additive color triples, e.g. B. Blue, green and red is converted.
- blue radiation emitted by the semiconductor body into complementary wavelength ranges in particular blue and yellow
- additive color triples e.g. B. Blue
- green and red is converted.
- the yellow or the green and red light is generated via the luminous substances.
- the color tone (color location in the CIE color chart) of the white light generated in this way can be varied by suitable selection of the dye (s) in terms of mixture and concentration.
- Suitable organic phosphors for a semiconductor component emitting white light are perylene phosphors such as B. BASF Lumogen F 083 for green luminescence, BASF Lumogen F 240 for yellow luminescence and BASF Lumogen F 300 for red luminescence. These dyes can be easily z. B. add transparent epoxy.
- a preferred method of producing a green-glowing semiconductor component with a blue light-emitting semiconductor body is to use boron silicate glass substituted for U0 2 ++ for the luminescence conversion element.
- light-scattering particles so-called diffusers
- the color impression and the radiation characteristic of the semiconductor component can advantageously be optimized.
- the luminescence conversion element consists at least partially of a transparent epoxy resin which is provided with an inorganic phosphor. This is because inorganic substances can advantageously be used
- a particularly preferred inorganic phosphor for the production of white-shining semiconductor components according to the invention is the phosphorus YAG: Ce (Y 3 Al 5 0 12 : Ce 3+ ). This can be mixed in a particularly simple manner in transparent epoxy resins conventionally used in LED technology. Also conceivable as phosphors are other grenades doped with rare earths such as. B. Y 3 Ga 5 0 12 : Ce 3+ , Y (Al, Ga) 5 0 12 : Ce 3+ and Y (Al, Ga) 5 0 12 : Tb 3 * and rare earth-doped alkaline earth metal sulfides such as, for . B. SrS: Ce 3+ , Na, SrS: Ce 3+ , Cl, SrS: CeCl 3 , CaS: Ce 3+ and SrSe: Ce 3+ .
- the thiogallates doped with rare earths are particularly suitable for generating various mixed-colored light.
- the yttrium can in principle also be replaced by scandium or lanthanum.
- the semiconductor component according to the invention there are at least all components which are irradiated with light, ie. H. also the luminescence conversion envelope or layer made of purely inorganic materials.
- the luminescence conversion element thus consists of an inorganic phosphor which is embedded in a temperature-stable, transparent or partially transparent inorganic material.
- the luminescence conversion element consists of an inorganic phosphor which is embedded in an advantageously low-melting inorganic glass (for example silicate glass).
- a preferred production method for such a luminescence conversion layer is the sol-gel technique, with which the entire luminescence conversion layer, ie. H. Both the inorganic phosphor and the embedding material can be produced in one operation.
- the luminescence cladding or the luminescence conversion layer and / or another component of the component sheath is additionally added a dye which luminesces in the blue and which weakens a so-called directional characteristic of the radiation emitted by the semiconductor body.
- Directional characteristic is to be understood that that of the Radiation emitted semiconductor body has a preferred radiation direction.
- the inorganic phosphor in powder form is used for the above-mentioned purpose of mixing the emitted radiation, the phosphor particles not dissolving in the substance (matrix) enveloping them.
- the inorganic phosphor and the substance enveloping it have different refractive indices. This advantageously leads to the fact that, depending on the grain size of the phosphor, a proportion of the light not absorbed by the phosphor is scattered. As a result, the directional characteristic of the radiation emitted by the semiconductor body is efficiently weakened, so that the unabsorbed radiation and the luminescence-converted radiation are mixed homogeneously, which leads to a spatially homogeneous color impression.
- a semiconductor component according to the invention which emits white light can be particularly preferably realized by admixing the inorganic phosphor YAG: Ce (Y 3 A1 5 0 12 : Ce 3+> with an epoxy resin used to produce the luminescence conversion envelope or layer Blue radiation emitted by the semiconductor body is shifted from the inorganic phosphor Y 3 A1 5 0 12 : Ce 3+ into the yellow spectral range and thus into a wavelength range complementary to the color blue.
- the color tone (color location in the CIE color table)
- the white light can be varied by a suitable choice of the dye mixture and concentration.
- the inorganic phosphor YAG: Ce has, inter alia, the particular advantage that these are insoluble color pigments (particle size in the range of 10 ⁇ m) with a refractive index of approximately 1.84.
- these are insoluble color pigments (particle size in the range of 10 ⁇ m) with a refractive index of approximately 1.84.
- light-scattering particles so-called diffusers
- the color impression and the radiation characteristic of the semiconductor component can advantageously be further optimized.
- the luminous efficiency of white-glowing semiconductor components according to the invention or the above-mentioned ones is particularly advantageous that the luminous efficiency of white-glowing semiconductor components according to the invention or the above-mentioned ones.
- Embodiments with a blue luminous semiconductor body produced essentially on the basis of GaN are comparable to the luminous efficiency of a light bulb.
- the external quantum yield of such semiconductor bodies is a few percent and on the other hand the luminescence yield of organic dye molecules is often in excess of 90%.
- the semiconductor component according to the invention is distinguished in comparison to the light bulb by an extremely long service life, greater robustness and a lower operating voltage.
- the brightness of the semiconductor component according to the invention which is perceptible to the human eye, can be significantly increased compared to a semiconductor component which is equipped without a luminescence conversion element but is otherwise identical, since the eye sensitivity increases towards a higher wavelength.
- the principle according to the invention can advantageously also be used to visibly emit ultraviolet radiation emitted by the semiconductor body in addition to the visible radiation. res light to be converted. This significantly increases the brightness of the light emitted by the semiconductor body.
- the concept of luminescence conversion with blue light from a semiconductor body presented here can advantageously also be expanded to multi-stage luminescence conversion elements, according to the ultraviolet -> ⁇ blue - »green -> yellow - * red scheme.
- a plurality of spectrally selectively emitting luminescence conversion elements are arranged one behind the other relative to the semiconductor body.
- YAG: Ce is used in particular as the luminescence conversion dye
- this phosphor upon excitation with blue light, has a spectral shift of approximately 100 nm between absorption and emission causes. This leads to a substantial reduction in the reabsorption of the light emitted by the luminophore and thus to a higher light output.
- YAG: Ce advantageously has a high thermal and photochemical (eg UV) stability (much higher than organic fluorescent materials), so that white-emitting diodes can also be produced for outdoor use and / or high temperature ranges.
- YAG-.Ce has so far proven to be reabsorption, light yield, thermal and photochemical stability and processability. most suitable phosphor highlighted. However, the use of other Ce-doped phosphors, in particular Ce-doped garnets, is also conceivable.
- Semiconductor components according to the invention can be used particularly advantageously, in particular because of their low power consumption in full-color suitable LED displays, for illuminating motor vehicle interiors or aircraft cabins and for illuminating display devices such as motor vehicle fittings or liquid crystal displays.
- FIG. 1 shows a schematic sectional view of a first exemplary embodiment of a semiconductor component according to the invention
- FIG. 2 shows a schematic sectional view of a second exemplary embodiment of a semiconductor component according to the invention
- FIG. 3 shows a schematic sectional view through a third exemplary embodiment of a semiconductor component according to the invention
- FIG. 4 shows a schematic sectional view of a fourth exemplary embodiment of a semiconductor component according to the invention
- FIG. 5 shows a schematic sectional view of a fifth exemplary embodiment of a semiconductor component according to the invention
- FIG. 6 shows a schematic sectional view of a sixth exemplary embodiment of a semiconductor component according to the invention
- FIG. 7 shows a schematic illustration of an emission spectrum of a semiconductor body emitting blue light with a layer sequence based on GaN
- FIG. 8 shows a schematic representation of the emission spectra of two semiconductor components according to the invention which emit white light;
- FIG. 9 shows a schematic sectional illustration through a semiconductor body which emits blue light
- FIG. 10 shows a schematic sectional view of a seventh exemplary embodiment of a semiconductor component according to the invention
- FIG. 11 shows a schematic representation of an emission spectrum of a semiconductor component according to the invention, which emits mixed-colored red light
- FIG. 12 shows a schematic representation of the emission spectra of further semiconductor components according to the invention, which emit white light
- FIG. 13 shows a schematic sectional view of an eighth exemplary embodiment of a semiconductor component according to the invention.
- FIG. 14 shows a schematic sectional view of a ninth exemplary embodiment of a semiconductor component according to the invention.
- a semiconductor body 1 has a rear-side contact 11, a front-side contact 12 and a layer sequence 7 composed of a number of different layers, which in operation of the semiconductor component has at least one radiation ( active zone emitting ultraviolet, blue or green).
- the z. B. consists of a layer sequence of an A1N or GaN layer 19, an n-type GaN layer 20, an n-type Ga ⁇ Al ⁇ N or Ga ⁇ n ⁇ N layer 21, a further n - conductive GaN or a Ga x In 1-X N layer 22, a p-type 23 and a p-type GaN layer 24 are applied.
- a contact metallization 27, 28 which consists of a material conventionally used in optical semiconductor technology for electrical contacts.
- any other semiconductor body that appears suitable to the person skilled in the art for the semiconductor component according to the invention can also be used. This also applies to all of the exemplary embodiments described below.
- the semiconductor body 1 by means of an electrically conductive connecting means, for. B. a metallic solder or an adhesive, with its rear side contact 11 attached to a first electrical connection 2.
- the front-side contact 12 is connected to a second electrical connection 3 by means of a bonding wire 14.
- a luminescence conversion envelope 5 This preferably consists of a transparent plastic (preferably epoxy resin or also polymethylmetaacrylate) which can be used for transparent light-emitting diode coatings and which is preferably coated with phosphor 6, preferably inorganic phosphor, for white luminous components Y 3 A1 5 0 12 : Ce 3+ (YAG: Ce) , is offset.
- a transparent plastic preferably epoxy resin or also polymethylmetaacrylate
- FIG. 2 of a semiconductor component according to the invention differs from that of FIG. 1 in that the semiconductor body 1 and partial areas of the electrical connections 2 and 3 are enclosed by a transparent envelope 15 instead of a luminescence conversion envelope.
- This transparent sheathing 15 does not change the wavelength of the radiation emitted by the semiconductor body 1 and consists, for example, of an in the Light-emitting diode technology conventionally used epoxy, silicone or acrylate resin or from another suitable radiation-permeable material such as. B. inorganic glass.
- a luminescence conversion layer 4 is applied to this transparent envelope 15 and, as shown in FIG. 2, covers the entire surface of the envelope 15. It is also conceivable that the luminescence conversion layer 4 covers only a partial area of this surface.
- the luminescence conversion layer 4 again consists, for example, of a transparent plastic (eg epoxy resin, lacquer or polymethyl methacrylate), which is mixed with a phosphor 6.
- YAG: Ce is also suitable here as a phosphor for a white-shining semiconductor component.
- This embodiment has the particular advantage that the path length through the luminescence conversion element is approximately the same for all the radiation emitted by the semiconductor body. This plays an important role in particular if, as is often the case, the exact color tone of the light emitted by the semiconductor component depends on this path length.
- a lenticular cover 29 (shown in dashed lines) can be provided on one side surface of the component, which reduces total reflection of the radiation within the luminescence conversion layer 4.
- This lenticular cover 29 can be made of transparent plastic or glass and, for example, glued to the luminescence conversion layer 4 or formed directly as a component of the luminescence conversion layer 4.
- the first and second electrical connections 2, 3 are in an opaque casual, possibly prefabricated basic housing 8 with a recess 9 embedded.
- “Prefabricated” is understood to mean that the base housing 8 is already finished at the connections 2, 3, for example by means of injection molding, before the semiconductor body is mounted on the connection 2.
- the base housing 8 consists, for example, of an opaque plastic
- the shape of the material and the recess 9 is designed as a reflector 17 for the radiation emitted by the semiconductor body during operation (if necessary by suitable coating of the inner walls of the recess 9)
- a conductor strip lead frame having the electrical connections 2, 3, for example by means of injection molding.
- the recess 9 is covered by a luminescence conversion layer 4, for example a separately produced cover plate 17 made of plastic and fastened to the base housing 8.
- a luminescence conversion layer 4 for example a separately produced cover plate 17 made of plastic and fastened to the base housing 8.
- Suitable materials for the luminescence conversion layer 4 are again the plastics or inorganic glass mentioned above in the general part of the description in connection with the phosphors mentioned there.
- the recess 9 can be filled with a transparent plastic, with an inorganic glass or with gas, or can be provided with a vacuum.
- a lenticular cover 29 (shown in dashed lines) can be provided on the luminescence conversion layer 4 for better coupling out of the light, which reduces total reflection of the radiation within the luminescence conversion layer 4.
- This cover 29 can consist of transparent plastic and, for example, be glued to the luminescence conversion layer 4 or be formed in one piece together with the luminescence conversion layer 4.
- the recess 9, as shown in FIG. 10 is filled with an epoxy resin provided with phosphor, ie with a luminescence coating 5, which forms the luminescence conversion element.
- a cover plate 17 and / or a lenticular cover 29 can then also be omitted.
- the first electrical connection 2 is optional.
- B. is formed by embossing in the region of the semiconductor body 1 as a reflector trough 34 which is filled with a luminescence conversion envelope 5.
- a so-called radial diode is shown as a further embodiment.
- the semiconductor body 1 is fastened in a part 16 of the first electrical connection 2 designed as a reflector, for example by means of soldering or gluing.
- Housing types of this type are known in light-emitting diode technology and therefore do not require any further explanation.
- the semiconductor body 1 is surrounded by a transparent sheathing 15 which, as in the second exemplary embodiment (FIG. 2), does not cause any change in the wavelength of the radiation emitted by the semiconductor body 1 and, for example, consists of a light emitting diode technology used transparent epoxy resin or organic glass.
- a luminescence conversion layer 4 is applied to this transparent envelope 15.
- Suitable materials for this are, for example, the plastics or inorganic glass mentioned in connection with the aforementioned exemplary embodiments in combination with the dyes mentioned therein.
- the entire structure, consisting of semiconductor body 1, partial areas of the electrical connections 2, 3, transparent sheathing 15 and luminescence conversion layer 4, is directly surrounded by a further transparent sheathing 10 which does not change the wavelength of the radiation which has passed through the luminescence conversion layer 4 causes. It again consists, for example, of a transparent epoxy resin conventionally used in light-emitting diode technology or of inorganic glass.
- FIG. 5 differs from that of FIG. 4 essentially in that the free surfaces of the semiconductor body 1 are directly covered by a luminescence conversion envelope 5, which in turn is surrounded by a further transparent envelope 10.
- FIG. 5 also shows, by way of example, a semiconductor body 1 in which, instead of the underside contact, a further contact is attached to the semiconductor layer sequence 7 and is connected to the associated electrical connection 2 or 3 by means of a second bonding wire 14.
- semiconductor bodies 1 can also be used in all the other exemplary embodiments described here.
- a semiconductor body 1 according to the aforementioned exemplary embodiments can of course also be used in the exemplary embodiment in FIG. 5.
- a luminescence conversion layer 4 (possible materials as specified above) applied directly to the semiconductor body l.
- This and partial areas of the electrical connections 2, 3 are enclosed by a further transparent sheathing 10, which does not change the wavelength of the radiation that has passed through the luminescence conversion layer 4, and, for example, from a transparent epoxy resin or glass that can be used in light-emitting diode technology is made.
- Such semiconductor bodies 1 provided with a luminescence conversion layer 4 without a covering can of course advantageously be used in all housing designs known from light-emitting diode technology (eg SMD housing, radial housing (see FIG. 5)).
- a transparent tub part 35 is arranged on the semiconductor body 1 and has a tub 36 above the semiconductor body 1.
- the tub part 35 consists for example of transparent epoxy resin or inorganic glass and is, for. B. manufactured by overmolding the electrical connections 2,3 including semiconductor body 1 ge.
- a luminescence conversion layer 4 is arranged in this trough 36.
- B. is in turn made of epoxy resin or inorganic glass, in the particle 37, consisting of one of the above. inorganic phosphors, are included. With this design, it is advantageously ensured in a very simple manner that the phosphor is located at locations not provided, for example, during the manufacture of the semiconductor component. B. accumulates next to the semiconductor body.
- the tub part 35 can of course also be manufactured separately and otherwise, e.g. B. on a housing part, above the semiconductor body 1.
- the luminescence conversion element in order to optimize the color impression of the emitted light as well to adapt the radiation characteristic, the luminescence conversion element (luminescence conversion envelope 5 or luminescence conversion layer 4), optionally the transparent envelope 15, and / or possibly the further transparent envelope 10 have light-scattering particles, advantageously so-called diffusers.
- diffusers are mineral fillers, in particular CaF 2 , Ti0 2 , Si0 2 , CaC0 3 or BaS0 4, or organic pigments. These materials can easily be added to the above-mentioned plastics.
- FIGS. 7, 8 and 12 show emission spectra of a semiconductor body that emits blue light (FIG. 7).
- Luminescence maximum at ⁇ -430 nm or of white semiconductor components according to the invention (FIGS. 8 and 12) produced by means of such a semiconductor body.
- the wavelength ⁇ in nm is plotted on the abscissa and a relative electroluminescence (EL) intensity is plotted on the ordinate.
- the dashed line 30 in FIG. 8 represents an emission spectrum from a semiconductor component according to the invention, which emits radiation from two complementary wavelength ranges (blue and yellow) and thus overall white light.
- the emission spectrum each has a maximum at wavelengths between approximately 400 and approximately 430 nm (blue) and between approximately 550 and approximately 580 nm (yellow).
- the solid line 31 represents the emission spectrum of a semiconductor component according to the invention, which mixes the color white from three wavelength ranges (additive color triple from blue, green and red).
- the emission spectrum here each has a maximum at the wavelengths of approximately 430 nm (blue), approximately 500 nm (green) and approximately 615 nm (red).
- FIG. 11 shows an emission spectrum of a semiconductor component according to the invention, which emits mixed-color light from blue light (maximum at a wavelength of approximately 470 nm) and red light (maximum at a wavelength of approximately 620 nm).
- the overall color impression of the emitted light for the human eye is magenta.
- the emission spectrum emitted by the semiconductor body corresponds here again to that of FIG. 7.
- FIG. 12 shows a white-shining semiconductor component according to the invention which is provided with a semiconductor body emitting an emission spectrum according to FIG. 7 and in which YAG: Ce is used as the phosphor. Only a part of the radiation emitted by the semiconductor body according to FIG. 7 is converted into a longer-wave wavelength range, so that white light is produced as a mixed color.
- the differently dashed lines 30 to 33 of FIG. 8 represent emission spectra of semiconductor components according to the invention, in which the luminescence conversion element, in this case a luminescence conversion envelope made of epoxy resin, has different YAG: Ce concentrations.
- the diagram of FIG. 12 shows that in the semiconductor component according to the invention, the CIE color location of the white light can be changed in a simple manner by changing the phosphor concentration in the epoxy resin.
- a semiconductor body such as, for example, light-emitting diode chips or laser diode chips, is also to be understood as meaning, for example, a polymer LED which emits an appropriate radiation spectrum.
Abstract
Description
Claims
Priority Applications (17)
Application Number | Priority Date | Filing Date | Title |
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EP97931666A EP0907969B1 (de) | 1996-06-26 | 1997-06-26 | Lichtabstrahlendes halbleiterbauelement mit lumineszenzkonversionselement |
DE59711671T DE59711671D1 (de) | 1996-06-26 | 1997-06-26 | Lichtabstrahlendes halbleiterbauelement mit lumineszenzkonversionselement |
BRPI9715293A BRPI9715293B1 (pt) | 1996-06-26 | 1997-06-26 | elemento de cobertura para um elemento de construção optoeletrônico |
KR1020067012235A KR100751692B1 (ko) | 1996-06-26 | 1997-06-26 | 발광 변환 소자를 포함하는 발광 반도체 소자 |
JP50211798A JP3773541B2 (ja) | 1996-06-26 | 1997-06-26 | ルミネセンス変換エレメントを有する半導体発光素子 |
BRPI9709998-8A BR9709998B1 (pt) | 1996-06-26 | 1997-06-26 | elemento de construção semicondutor, irradiador de luz, com elemento de conversão de luminescência |
US09/221,789 US7078732B1 (en) | 1996-06-26 | 1998-12-28 | Light-radiating semiconductor component with a luminescence conversion element |
HK00101386A HK1022564A1 (en) | 1996-06-26 | 2000-03-03 | A light-radiating semiconductor component, a full-color light emitting diode display device, and theusage thereof |
US09/731,220 US6812500B2 (en) | 1996-06-26 | 2000-12-06 | Light-radiating semiconductor component with a luminescence conversion element |
US09/731,452 US6576930B2 (en) | 1996-06-26 | 2000-12-07 | Light-radiating semiconductor component with a luminescence conversion element |
US09/828,727 US20010030326A1 (en) | 1996-06-26 | 2001-04-09 | Light-radiating semiconductor component with a luminescence conversion element |
US10/979,778 US7151283B2 (en) | 1996-06-26 | 2004-11-02 | Light-radiating semiconductor component with a luminescence conversion element |
US11/080,786 US7126162B2 (en) | 1996-06-26 | 2005-03-15 | Light-radiating semiconductor component with a luminescence conversion element |
US11/150,916 US7345317B2 (en) | 1996-06-26 | 2005-06-13 | Light-radiating semiconductor component with a luminescene conversion element |
US11/828,450 US7629621B2 (en) | 1996-06-26 | 2007-07-26 | Light-radiating semiconductor component with a luminescence conversion element |
US12/610,560 US9196800B2 (en) | 1996-06-26 | 2009-11-02 | Light-radiating semiconductor component with a luminescence conversion element |
US13/462,952 US20120241779A1 (en) | 1996-06-26 | 2012-05-03 | Light-Radiating Semiconductor Component with a Luminescence Conversion Element |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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DE19625622.4 | 1996-06-26 | ||
DE19625622A DE19625622A1 (de) | 1996-06-26 | 1996-06-26 | Lichtabstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement |
DE19638667.5 | 1996-09-20 | ||
DE19638667A DE19638667C2 (de) | 1996-09-20 | 1996-09-20 | Mischfarbiges Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement |
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US09/221,789 Continuation US7078732B1 (en) | 1996-06-26 | 1998-12-28 | Light-radiating semiconductor component with a luminescence conversion element |
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WO1997050132A1 true WO1997050132A1 (de) | 1997-12-31 |
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PCT/DE1997/001337 WO1997050132A1 (de) | 1996-06-26 | 1997-06-26 | Lichtabstrahlendes halbleiterbauelement mit lumineszenzkonversionselement |
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US (10) | US7078732B1 (de) |
EP (12) | EP1441395B9 (de) |
JP (10) | JP3773541B2 (de) |
KR (11) | KR20040111701A (de) |
CN (3) | CN1534802B (de) |
BR (2) | BRPI9715293B1 (de) |
DE (6) | DE29724543U1 (de) |
HK (1) | HK1022564A1 (de) |
WO (1) | WO1997050132A1 (de) |
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WO1998019290A1 (de) * | 1996-10-31 | 1998-05-07 | Siemens Aktiengesellschaft | Mehrfarbiges licht abstrahlende bildanzeigevorrichtung |
EP0855751A2 (de) * | 1997-01-24 | 1998-07-29 | International Business Machines Corporation | Lichtemittierende Diode |
EP0883195A1 (de) * | 1997-06-03 | 1998-12-09 | BARR & STROUD LIMITED | Kopfnachführsystem, das eine LED mit fluoreszierender Beschichtung aufweist |
EP0890996A2 (de) * | 1997-07-07 | 1999-01-13 | Asahi Rubber Inc. | Durchsichtige Beschichtung für Leuchtdioden und fluoreszierende Lichtquellen |
EP0936682A1 (de) * | 1996-07-29 | 1999-08-18 | Nichia Chemical Industries, Ltd. | Licht-emittierende vorrichtung und anzeigevorrichtung |
FR2779694A1 (fr) * | 1998-06-10 | 1999-12-17 | Sagem | Tableau de bord a eclairage polychrome |
EP1021817A1 (de) * | 1997-07-14 | 2000-07-26 | Hewlett-Packard Company | Linse für eine lichtemittierende diode mit ein epoxy zugefügten fluoreszenzfarbstoffe |
JP2000223749A (ja) * | 1999-01-29 | 2000-08-11 | Seiwa Electric Mfg Co Ltd | 発光ダイオードランプとその製造方法、チップ型発光ダイオード素子及びドットマトリクス型発光ダイオードユニット |
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