Optoelectronic device

Patent metadata

Field	Value
Publication number	US-9459383-B2
Application number	US-201314430202-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 27, 2012
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

The invention relates to an optoelectronic device ( 101 ), comprising: a semiconductor layer sequence ( 103 ) comprising an emitter layer ( 105 ) for emitting electromagnetic radiation, a converter ( 113 ) for converting electromagnetic radiation with a first wavelength into an electromagnetic radiation with a second wavelength which differs from the first wavelength, a scattering body ( 109 ) for scattering at least a part of the electromagnetic radiation emitted by the emitter layer ( 105 ) in the direction of the converter ( 113 ) in order to convert at least a part of the emitted electromagnetic radiation, wherein the scattering body ( 109 ) comprises a positive, temperature-dependent scattering cross-section and so, as the temperature increases, scattering of the electromagnetic radiation in the scattering body ( 109 ) in the direction of the converter can be increased. The invention also relates to a scattering body ( 109 ).

First claim

The invention claimed is:

1. An optoelectronic device, comprising:
a semiconductor layer sequence with an active zone comprising an emitter layer for emitting electromagnetic radiation;
a first converter for converting electromagnetic radiation with a first wavelength into an electromagnetic radiation with a second wavelength which differs from the first wavelength, wherein the second wavelength is selected from the wavelength range of green light;
two second converters for converting electromagnetic radiation of the first converter into red light, wherein the two second converters are respectively disposed left and right of the active zone in side view and are adjacent to the active zone; and
a scattering body, which is disposed on the first converter and the two second converters, for scattering at least a part of the electromagnetic radiation emitted by the first converter, wherein the scattering body comprises a positive, temperature-dependent scattering cross-section and so, as the temperature increases, scattering of the electromagnetic radiation in the scattering body in the direction of the two second converters can be increased and thus the conversion of the green light emitted by the first converter into red light emitted by the two second converters can be increased, and wherein the device emits red light as well as green light.

2. The optoelectronic device according to claim 1 , wherein the scattering body comprises at least one scattering region and a plurality of non-scattering regions, wherein the scattering region has a positive, temperature-dependent scattering cross-section, wherein the non-scattering regions are transparent for the emitted electromagnetic radiation, wherein the scattering region is formed above the first converter.

3. The optoelectronic device according to claim 1 , wherein the scattering body comprises a radiation-permeable matrix material with a first refraction index and scattering particles embedded therein and having a second refraction index, and wherein a difference between the first and the second refraction index can be increased as the temperature increases.

4. The optoelectronic device according to claim 3 , wherein a scattering particle size is between 200 μm and 10,000 μm.

5. The optoelectronic device according to claim 1 , wherein the scattering body is formed as a collecting lens for focussing the non-scattered electromagnetic radiation.

6. The optoelectronic device according to claim 1 , wherein the semiconductor layer sequence and the first converter are arranged adjacent to one another on a carrier substrate surface, and wherein the scattering body is arranged at least on one of the two respective surfaces of the semiconductor layer sequence and of the first converter opposite the carrier substrate surface.

7. The optoelectronic device according to claim 1 , wherein the scattering body comprises a non-scattering region to emit a minimum intensity of a non-converted electromagnetic radiation.

8. The optoelectronic device according to claim 7 , wherein the non-scattering region is arranged on at least one of the two respective surfaces of the semiconductor layer sequence and of the first converter.

9. The optoelectronic device according to claim 1 , wherein the matrix material comprises a silicone selected from the following group of silicones: polysiloxane, methylene-silicone and phenylene-silicone.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Linkov Alexander
• Sabathil Matthias

Classifications

• G02B5/0242

  by means of dispersed particles · CPC title

• G02B5/0278 Primary

  used in transmission · CPC title

• G02B5/0247

  by means of voids or pores · CPC title

• G02B5/0294 Primary

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title

• G02B5/0263

  with positional variation of the diffusing properties, e.g. gradient or patterned diffuser · CPC title