WO2021028352A1 - Optoelektronisches bauelement - Google Patents
Optoelektronisches bauelement Download PDFInfo
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- WO2021028352A1 WO2021028352A1 PCT/EP2020/072292 EP2020072292W WO2021028352A1 WO 2021028352 A1 WO2021028352 A1 WO 2021028352A1 EP 2020072292 W EP2020072292 W EP 2020072292W WO 2021028352 A1 WO2021028352 A1 WO 2021028352A1
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- Prior art keywords
- wavelength conversion
- conversion plate
- optoelectronic component
- radiation
- carrier
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
- H01S5/0608—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch
- H01S5/0609—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch acting on an absorbing region, e.g. wavelength convertors
- H01S5/0611—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch acting on an absorbing region, e.g. wavelength convertors wavelength convertors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/8506—Containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0087—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02255—Out-coupling of light using beam deflecting elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
- H10H20/8514—Wavelength conversion means characterised by their shape, e.g. plate or foil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/16—Laser light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/19—Attachment of light sources or lamp holders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/10—Arrangement or contour of the emitted light
- F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
- F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4031—Edge-emitting structures
- H01S5/4056—Edge-emitting structures emitting light in more than one direction
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
- H10H20/841—Reflective coatings, e.g. dielectric Bragg reflectors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/882—Scattering means
Definitions
- An optoelectronic component is specified.
- An optoelectronic component is set up, in particular, to generate electromagnetic radiation, in particular light that is perceptible to the human eye.
- One problem to be solved consists in specifying an optoelectronic component which has a particularly high luminance.
- the optoelectronic component comprises at least one semiconductor emitter, the one for emitting electromagnetic radiation of a first
- the active area preferably comprises a pn junction, a double heterostructure, a single quantum well structure (SQW, single quantum well) or a multiple quantum well structure (MQW, multi quantum well) for generating radiation.
- the semiconductor emitters are, for example, light or laser diodes.
- the first wavelength range preferably comprises at least part of the range of the spectrum of electromagnetic radiation that is visible to humans.
- the optoelectronic component or its embodiment described above comprises at least one wavelength conversion plate, which has a coupling-out surface and a side surface which is arranged to the side and oriented transversely to this having.
- the side surface is divided into a plurality of sections.
- the wavelength conversion plate is set up in particular to convert electromagnetic radiation of the first wavelength range to electromagnetic radiation of a second wavelength range, the second wavelength range being different from the first wavelength range.
- the wavelength conversion plate has, for example, a ceramic matrix material into which particles of a conversion material are introduced.
- the wavelength conversion plate is formed with at least one of the following materials: YAG,
- LuAG silicon nitride or quantum dots, each with corresponding doping atoms.
- Doping atoms are for example Ce, Gd, Ga.
- the coupling-out surface of the wavelength conversion plate is preferably oriented parallel to the main plane of extension of the wavelength conversion plate.
- the coupling-out surface is set up in particular for coupling out electromagnetic radiation from the wavelength conversion plate.
- the side face oriented laterally and transversely to the coupling-out face delimits the wavelength conversion plate in particular in its main direction of extent.
- the side face is preferably set up for coupling electromagnetic radiation into the wavelength conversion plate.
- the optoelectronic component or one of its embodiments described above comprises a carrier on which the semiconductor emitter and the wavelength conversion plate are arranged.
- the semiconductor emitter and the wavelength conversion plate are arranged in a common plane on the carrier.
- the semiconductor emitter is on one opposite the
- the carrier serves, for example, as a mounting surface for the following components.
- the carrier is preferably a mechanically supporting component of the optoelectronic component which gives the component sufficient stability.
- the carrier is designed as an essentially flat plate.
- the carrier preferably has a high thermal conductivity in order to serve for cooling the components attached to the carrier.
- the semiconductor emitter and the wavelength conversion plate have a form-fitting connection to the carrier.
- a heat exchange between the carrier, the semiconductor emitter and the wavelength conversion plate is improved.
- a direct arrangement of the semiconductor emitter and the wavelength conversion plate on the carrier advantageously enables particularly good heat dissipation from the semiconductor emitter and the wavelength conversion plate.
- the coupling-out area faces away from the carrier.
- Wavelength conversion plate refers to the side of the wavelength conversion plate that is on the side facing away from the carrier.
- the decoupling surface is used especially for decoupling electromagnetic radiation from the wavelength conversion plate.
- the semiconductor emitter is set up to irradiate the wavelength conversion plate on the side face with electromagnetic radiation.
- the semiconductor emitter is arranged on the carrier in such a way that it irradiates the side face of the wavelength conversion plate with electromagnetic radiation.
- the wavelength conversion plate is set up to emit mixed radiation comprising at least part of the radiation of the first wavelength range and converted radiation of a second wavelength range from the coupling-out surface.
- the mixed radiation creates a white color impression for an observer.
- the optoelectronic component or one of its embodiments described above comprises
- At least one semiconductor emitter which has an active area set up to emit electromagnetic radiation of a first wavelength range
- At least one wavelength conversion plate which has a decoupling surface and a side surface arranged laterally to this and oriented transversely to this
- the semiconductor emitter is set up to irradiate the wavelength conversion plate on the side face with electromagnetic radiation
- the wavelength conversion plate is set up to emit mixed radiation comprising at least part of the radiation of the first wavelength range and converted radiation of a second wavelength range from the coupling-out surface.
- An optoelectronic component described here is based, among other things, on the following considerations: the use of optoelectronic components, for example in automobile headlights, requires the integration of optoelectronic components in an increasingly smaller installation space, due to additional sensors, in particular cameras, which are also in the headlights, respectively the front area of the automobile. Due to the thus decreasing expansion of the optoelectronic components, while the demands on the amount of light generated by the components remain the same, components with higher luminance are advantageous. Sufficiently high luminance levels are provided, for example, by laser diodes which are used, for example, with the aid of a wavelength conversion plate to emit electromagnetic radiation with a white color impression. The smaller expansion of optoelectronic components means however, an increased heat development of the components. Furthermore, when using laser diodes, increased expenditure is necessary in order to avoid the direct impact of electromagnetic radiation from the laser diode on a viewer.
- the optoelectronic component described here and its embodiments make use, inter alia, of the idea of a semiconductor emitter and a
- Wavelength conversion plate takes place, for example, laterally and thus parallel to the main direction of extent of the carrier. The risk of electromagnetic radiation being coupled out directly from the semiconductor emitter is thus advantageously reduced.
- the semiconductor emitter is a laser diode.
- a laser diode has, in particular, a high luminance and a particularly high degree of polarization.
- a laser diode is preferably set up to emit coherent radiation.
- Coherent radiation is essentially monochromatic and comprises a very narrow spectral wavelength range.
- the semiconductor emitter has a radiation cone, the cross section of which has an elliptical shape perpendicular to an axis of the radiation cone.
- the semiconductor emitter is arranged on the carrier in such a way that the longer axis of the ellipse is aligned parallel to the main direction of extent of the side face of the wavelength conversion plate.
- the parallel alignment does not necessarily have to be exactly parallel, but rather shows a slight deviation from the parallel alignment, for example within the scope of a manufacturing tolerance. Direct irradiation of the side surface with the electromagnetic radiation of the first wavelength range is thus possible.
- Optical components for reshaping the radiation cone are advantageously dispensed with.
- the side surface is oriented at the Brewster angle to the axis of the radiation cone.
- the radiation of light emitted from the semiconductor emitter onto the side surface of the wavelength conversion plate thus takes place in particular at Brewster's angle, which advantageously reduces back reflection of the radiation.
- the coupling efficiency of the electromagnetic radiation is thereby advantageously increased.
- the coupling efficiency is determined, among other things, from the degree of polarization of the electromagnetic radiation and the alignment of the plane of polarization. A high degree of polarization advantageously results in increased coupling efficiency.
- the side surface is inclined in the direction of the carrier in order to ensure the unimpeded coupling out of any remaining portion of a reflection from the Semiconductor emitter to prevent emitted radiation. Direct emission of radiation from the semiconductor emitter is thus advantageously avoided, as a result of which eye safety is increased.
- an optical coating is applied to the side surface.
- the optical coating is, for example, an anti-reflective coating or a dichroic coating.
- the optical coating contributes, for example, to an increase in the coupling efficiency without being dependent on a specific angle of incidence. In other words, using a
- Anti-reflective coating or a dichroic coating can increase the coupling efficiency even without aligning the side surface at the Brewster angle.
- a simplified method for producing the side surface is made possible in this way, since no defined angle between the side surface and the radiation cone has to be maintained.
- a light guide is arranged between the semiconductor emitter and the wavelength conversion plate, the radiation of the semiconductor emitter onto the
- Wavelength conversion plate leads.
- the assembly of the semiconductor emitter takes place independently of the geometry of the radiation cone and its distance from the wavelength conversion plate.
- the light guide is preferably formed with a radiation-permeable material.
- the refractive index of the material of the light guide is higher than the refractive index of the material surrounding it. This enables, for example, electromagnetic radiation to be guided in the light guide by means of total reflection.
- At least two semiconductor emitters are used for irradiating the side face
- Wavelength conversion plate provided. By means of two semiconductor emitters on opposite sides of the wavelength conversion plate, for example, particularly uniform illumination of the wavelength conversion plate is achieved.
- the radiation cones of at least two semiconductor emitters at least partially overlap.
- the radiation cones of the semiconductor emitters at least partially overlap in areas of the side face where a particularly high intensity of electromagnetic radiation is advantageous.
- the wavelength conversion plate has at least one absorbing or reflecting sub-area for targeted influencing of the
- An absorbing or reflecting sub-area is used, for example, to shape the radiation distribution emitted by the coupling-out surface.
- a desired radiation distribution corresponding to a desired illumination of the roadway is achieved enables.
- the partial area is preferably arranged as a coating on a side of the wavelength conversion plate facing away from the carrier. Alternatively, the partial area is let into the wavelength conversion plate
- the wavelength conversion plate has conversion particles and scatter particles.
- Conversion particles are particularly suitable for converting electromagnetic radiation of a first wavelength to electromagnetic radiation of a second wavelength.
- Scatter particles are especially designed to spatially distribute electromagnetic radiation.
- a desired intensity distribution of the mixed radiation over the coupling-out surface of the wavelength conversion plate is set by means of a variation of a scattering effect in the wavelength conversion plate.
- the scattering effect is adjusted, for example, by varying the density, the size and / or the type of scattering centers. Pores filled with a gas, the scattering particles and / or the conversion particles, in particular, serve as scattering centers. For example, a decrease in intensity of the incident electromagnetic radiation of the first wavelength range is compensated for from the outside to the inside.
- a desired distribution of radiation from the wavelength conversion plate over the coupling-out surface is thus targeted coupled out mixed radiation set.
- the scattering effect varies, for example, by at least 5%, preferably by at least 10% of its mean value.
- a desired intensity and / or color distribution of the mixed radiation over the coupling-out surface of the wavelength conversion plate is set by means of a variation of a conversion effect in the wavelength conversion plate.
- a desired radiation distribution of the radiation coupled out from the wavelength conversion plate via the coupling-out surface is thus set in a targeted manner.
- the conversion effect can be set, for example, by means of different dopants in the converter particles, a variation in the density of the converter particles, the size of the converter particles or the converter material used.
- the wavelength conversion plate has a thickness of from 3 ⁇ m up to and including 500 ⁇ m, preferably from 70 ⁇ m up to and including 150 ⁇ m.
- a particularly thin wavelength conversion plate advantageously enables particularly good heat dissipation from the wavelength conversion plate.
- the first wavelength range of the semiconductor emitter comprises a range from 380 nm up to and including 500 nm, preferably a range from including 440 nm up to and including 460 nm.
- a wavelength conversion to, for example, yellow light is particularly easy.
- a mixed light is generated that gives an observer a white color impression.
- the carrier is formed with one of the following materials: aluminum nitride, a metal and / or a silicon carbide.
- Aluminum nitride, metals and silicon carbide have particularly high thermal conductivity.
- the metal includes in particular Au, Ag and / or Cu or an alloy of the metals mentioned.
- a high thermal conductivity advantageously contributes to particularly efficient heat dissipation of the components applied to the carrier.
- a coating that increases the reflection of a radiation to be emitted by the wavelength conversion plate is arranged between the carrier and the wavelength conversion plate.
- the radiation to be emitted by the wavelength conversion plate comprises the electromagnetic radiation of the first wavelength range and the converted radiation. So one of the
- Wavelength conversion plate emitted radiation is preferably coupled out in the direction of the coupling-out surface.
- the coating is only applied in certain areas.
- the coating is initially applied to the wavelength conversion plate.
- the wavelength conversion plate provides, in particular, a smooth and level surface which enables the coating to be arranged in a particularly simple manner.
- the coating is applied to the carrier before the wavelength conversion plate is mounted on the carrier. The arrangement of a very thin, for example sprayed on, coating is advantageously facilitated.
- An optoelectronic component described here and its embodiments are particularly suitable for use as a headlight in an automobile.
- FIG. 1 shows a schematic view of an optoelectronic component described here in accordance with a first exemplary embodiment
- FIG. 2 shows a section of a schematic view of the optoelectronic component described here in accordance with the first exemplary embodiment
- FIG. 3 shows a schematic view of an optoelectronic component described here in accordance with a second exemplary embodiment
- FIG. 4 shows a schematic sectional view of an optoelectronic component described here in accordance with a third exemplary embodiment
- FIG. 5 shows a schematic sectional view of an optoelectronic component described here in accordance with the first exemplary embodiment
- FIG. 6 shows a schematic plan view of a wavelength conversion plate described here in accordance with a first exemplary embodiment
- FIG. 7 shows a schematic sectional view of an optoelectronic component described here in accordance with a fourth exemplary embodiment
- FIG. 8 shows a schematic sectional view of an optoelectronic component described here in accordance with a fifth exemplary embodiment.
- FIG. 1 shows a schematic view of an optoelectronic component 1 described here in accordance with a first exemplary embodiment.
- the illustrated optoelectronic component 1 comprises four semiconductor emitters 10 and a wavelength conversion plate 20, which together is arranged with the semiconductor emitters on a carrier 30.
- the semiconductor emitters 10 are designed as laser diodes and are set up to emit coherent electromagnetic radiation. Furthermore, the semiconductor emitters 10 each have elliptical radiation cones, each with a longer elliptical axis and a shorter elliptical axis. The longer axis of the ellipse is caused in particular by a large angle of radiation, while the shorter axis of the ellipse causes a small angle of radiation.
- the semiconductor emitters 10 are mounted on opposite sides of the wavelength conversion plate 20 in order to ensure a particularly uniform irradiation of the side surfaces 20B.
- the radiation cone of the semiconductor emitter 10 corresponds in a cross section transverse to the axis of the radiation cone to an ellipse.
- the semiconductor emitters 10 are arranged on the carrier 30 in such a way that the longer axis of the ellipse is aligned parallel to the main direction of extent of the wavelength conversion plate 20 within the scope of a manufacturing tolerance.
- the semiconductor emitters 10 are mounted by means of an auxiliary carrier 301 in order to ensure sufficient mechanical stability of the mounted semiconductor emitters 10.
- the auxiliary carrier enables an arrangement of the semiconductor emitters 10 rotated by 90 ° along the main axis of the radiation cone.
- the longer elliptical axis of the semiconductor emitters 10 is preferably aligned parallel to the main extension plane of the wavelength conversion plate 20.
- the auxiliary carrier 301 is formed with aluminum nitride or silicon carbide and also improves the cooling of the semiconductor emitters 10.
- the direct arrangement of the semiconductor emitters 10 on the carrier 30 advantageously enables particularly good cooling and also serves to align the semiconductor emitters 10 and the wavelength conversion plate 20 in a common Level.
- the wavelength conversion plate 20 is formed with one of the following materials: YAG, LuAG, silicon nitride or quantum dots, each with corresponding doping atoms. Doping atoms are, for example, Ce, Gd, Ga.
- the wavelength conversion plate 20 comprises a coupling-out surface 20A through which electromagnetic radiation is coupled out.
- the coupling-out surface 20A has an edge length of 300 ⁇ m on its shorter side and an edge length of 1 mm on its longer side.
- the wavelength conversion plate 20 has a specifically shaped decoupling surface 20A in order to achieve a desired radiation characteristic.
- a shadow edge desired for a low beam of an automobile is generated in this way.
- a side surface 20B arranged around the wavelength conversion plate 20 is located transversely to the coupling-out surface 20A.
- the thickness of the wavelength conversion plate 20 is equal to the height of the side surface 20B and is between 70 ⁇ m and 100 ⁇ m, inclusive.
- the coupling of electromagnetic radiation from the semiconductor emitter 10 takes place on the side face 20B of the wavelength conversion plate 20.
- the carrier 30 is formed with aluminum nitride and has a particularly high thermal conductivity.
- a protective layer 50 on the upper side of the carrier 30.
- the protective layer 50 is designed to be radiation-permeable and, for example, made of a glass or sapphire.
- FIG. 2 shows a section of a schematic view of the optoelectronic component described here in accordance with the first exemplary embodiment.
- the cutout includes a semiconductor emitter 10, an auxiliary carrier 301 and the wavelength conversion plate 20. The coupling of the electromagnetic radiation from the semiconductor emitter 10 into the side surface 20B of the wavelength conversion plate can be clearly seen.
- the side surface 20B has a bevel that faces the carrier 30.
- the beveling takes place at an angle which ensures that the electromagnetic radiation from the semiconductor emitter 10 strikes the side face 20B of the wavelength conversion plate 20 at the Brewster angle. This ensures particularly efficient coupling of the electromagnetic radiation into the wavelength conversion plate 20.
- FIG. 3 shows a schematic view of an optoelectronic component 1 described here in accordance with a second exemplary embodiment.
- the optoelectronic component 1 comprises four semiconductor emitters 10 which are arranged on a carrier 30 together with a wavelength conversion plate 20, four light guides 40 and four auxiliary carriers 301.
- a protective layer 50 which is designed to be transparent to the emitted light.
- the light guides 40 are on the carrier 30 between the semiconductor emitters 10 and the
- Wavelength conversion plate 20 is arranged.
- the light guides 40 serve to guide electromagnetic radiation emitted by the semiconductor emitter 10 in the direction of the wavelength conversion plate 20.
- the refractive index of the light guides 40 is higher than the refractive index of the material surrounding them.
- the semiconductor emitters 10 are assembled in this way without taking into account the opening angle of the radiation cone of the electromagnetic radiation emitted by the semiconductor emitters 10.
- FIG. 4 shows a schematic sectional view of an optoelectronic component 1 described here in accordance with a third exemplary embodiment.
- Two optoelectronic semiconductor emitters 10 with auxiliary carriers 301 are applied to a carrier 30.
- the semiconductor emitters 10 each include an active region 100 set up to generate electromagnetic radiation.
- the radiation of the first wavelength range emitted by the semiconductor emitters 10 enters the wavelength conversion plate 20 through the side face 20B.
- Wavelength conversion plate 20 at least part of the electromagnetic radiation of the first wavelength range is converted to electromagnetic radiation of a second wavelength range that differs from the first wavelength range.
- the radiation of the first wavelength range and the second wavelength range mixes in the
- Wavelength conversion plate 20 to a mixed radiation.
- the wavelength conversion plate 20 has a coupling-out surface 20A through which the mixed radiation is coupled out of the wavelength conversion plate 20.
- the mixed radiation is composed, in particular, of blue light and yellow light and thus evokes a white color impression in a viewer.
- FIG. 5 shows a schematic sectional view of an optoelectronic component 1 described here in accordance with the first exemplary embodiment.
- the form of representation shown in FIG. 5 clearly shows a bevel of the side surfaces 20B towards the carrier 30.
- the bevel of the side surfaces 20B enables electromagnetic radiation from the semiconductor emitters 10 to be coupled into the wavelength conversion plate 20 at Brewster's angle.
- the inclination of the side surface 20B in the direction of the carrier 30 advantageously prevents a possible direct coupling out of electromagnetic radiation of the first wavelength range. Radiation of the first
- the wavelength range which emerges from the semiconductor emitters 10 and is partially reflected by the side surface 20B is thus only reflected in the direction of the carrier 30 in order to be absorbed there, for example.
- FIG. 6 shows a schematic plan view of a wavelength conversion plate 20 described here in accordance with a first exemplary embodiment. The shown
- Wavelength conversion plate 20 comprises several partial areas 201 which are designed to be absorbent or reflective.
- the partial areas 201 thus become, for example, a projection of a logo in that these sub-areas have reduced or no emission of electromagnetic radiation.
- the subregions 201 are arranged in particular as coatings on the side of the wavelength conversion plate 20 facing away from the carrier 30.
- a reflective partial area 201 at least partially reflects electromagnetic radiation back into the wavelength conversion plate 20, whereby the radiation can be coupled out at another point.
- FIG. 7 shows a schematic sectional view of an optoelectronic component 1 described here in accordance with a fourth exemplary embodiment.
- the optoelectronic component 1 comprises a carrier 30, on which a plurality of semiconductor emitters 10 are mounted with the aid of auxiliary carriers 301.
- the semiconductor emitters 10 each include an active area for generating electromagnetic radiation of a first wavelength range.
- a wavelength conversion plate 20 is mounted on the carrier 30 and is set up to convert electromagnetic radiation of the first wavelength range at least partially into electromagnetic radiation of a second
- the semiconductor emitters 10 couple the electromagnetic radiation of the first wavelength range into the wavelength conversion plate 20 via the side faces 20B of the wavelength conversion plate 20.
- a mixed radiation of electromagnetic radiation of the first and second wavelength ranges consequently emerges from the wavelength conversion plate 20.
- the carrier 30 also has a reflection-increasing coating 60 between the carrier 30 and the Wavelength conversion plate 20 is arranged.
- the reflection-increasing coating 60 is formed, for example, with a metal or a titanium dioxide and is used to reflect the mixed radiation generated in the wavelength conversion plate 20.
- the reflection-increasing coating 60 advantageously increases the efficiency of the optoelectronic component 1.
- FIG. 8 shows a schematic sectional view of an optoelectronic component 1 described here in accordance with a fifth exemplary embodiment.
- the fifth exemplary embodiment essentially corresponds to the third exemplary embodiment shown in FIG.
- an optical coating 70 is arranged on the side surface 20B of the wavelength conversion plate 20.
- the optical coating 70 comprises an anti-reflective layer and / or a dichroic layer and advantageously increases the coupling efficiency of electromagnetic radiation into the wavelength conversion plate 20.
- the side surface 20B does not have to be oriented at a special angle to the radiation cone of the electromagnetic radiation.
- a dichroic layer is permeable to the electromagnetic radiation of the semiconductor emitter 10, while it is designed to be reflective for the electromagnetic radiation converted in the wavelength conversion plate 20.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Led Device Packages (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022508929A JP7331244B2 (ja) | 2019-08-14 | 2020-08-07 | オプトエレクトロニクス素子 |
| US17/634,741 US12341318B2 (en) | 2019-08-14 | 2020-08-07 | Optoelectronic component |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019121896.9 | 2019-08-14 | ||
| DE102019121896.9A DE102019121896A1 (de) | 2019-08-14 | 2019-08-14 | Optoelektronisches bauelement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021028352A1 true WO2021028352A1 (de) | 2021-02-18 |
Family
ID=72086836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2020/072292 Ceased WO2021028352A1 (de) | 2019-08-14 | 2020-08-07 | Optoelektronisches bauelement |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12341318B2 (de) |
| JP (1) | JP7331244B2 (de) |
| DE (1) | DE102019121896A1 (de) |
| WO (1) | WO2021028352A1 (de) |
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- 2020-08-07 WO PCT/EP2020/072292 patent/WO2021028352A1/de not_active Ceased
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2022545365A (ja) | 2022-10-27 |
| US12341318B2 (en) | 2025-06-24 |
| US20220285912A1 (en) | 2022-09-08 |
| DE102019121896A1 (de) | 2021-02-18 |
| JP7331244B2 (ja) | 2023-08-22 |
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