Reflection Mode Package for Optical Devices Using Gallium and Nitrogen Containing Materials

• US 20110215348A1
• Filed: 02/02/2011
• Published: 09/08/2011
• Est. Priority Date: 02/03/2010
• Status: Abandoned Application

• Current Assignee: Korrus Incorporated (MKD Electric, Inc.)
• Original Assignee: Soraa, Inc.
• Inventors: Sharma, Rajat, Venkatesh, Rakesh, Shum, Frank Tin Chung, Trottier, Troy Anthony, Krames, Michael Ragan
• Application Number:
  US13/019,521
• Publication Number:
  US 20110215348A1
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/612 with zinc or cadmium
• CPC Class Codes: C09K 11/616 with alkali or alkaline earth metals
• CPC Class Codes: C09K 11/642 with zinc or cadmium
• CPC Class Codes: C09K 11/7718 with alkaline earth metals
• CPC Class Codes: C09K 11/7737 Phosphates
• CPC Class Codes: C09K 11/7738 with alkaline earth metals
• CPC Class Codes: C09K 11/7739 with halogens
• CPC Class Codes: C09K 11/774 Borates
• CPC Class Codes: C09K 11/7767 Chalcogenides
• CPC Class Codes: C09K 11/778 Borates
• CPC Class Codes: C09K 11/7784 Chalcogenides
• CPC Class Codes: C09K 11/7787 Oxides C09K11/7785 takes precedence
• CPC Class Codes: C09K 11/7789 Oxysulfides
• CPC Class Codes: C09K 11/7794 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21Y 2115/10 : Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 : Arched
• CPC Class Codes: H01L 2924/00 : Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 : the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/12044 : OLED
• CPC Class Codes: H01L 33/504 : Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/60 : Reflective elements

Abstract

An optical device includes an LED formed on a substrate and a wavelength conversion material, which may be stacked or pixilated, within vicinity of the LED. A wavelength selective surface blocks direct emission of the LED device and transmits selected wavelengths of emission caused by an interaction with the wavelength conversion material.

Claims

1. An optical device comprising:

a mounting member having a surface region;

at least one LED device overlying a portion of the surface region;

a wavelength conversion material disposed over at least a portion of the surface region;

a wavelength selective surface configured to reflect substantially direct emission of the LED device and transmit a selected wavelength of converted emission caused by an interaction of the wavelength conversion material and the direct emission of the LED device;

wherein at least 30% of the direct emission from the LED device is reflected from the wavelength selective surface prior to interacting with the wavelength conversion material.

2. The optical device of claim 1 wherein the wavelength material has a thickness of less than 100 um.

3. The optical device of claim 1 wherein the surface region has a reflectivity greater than 50% at one or more of the emission wavelengths.

4. The optical device of claim 1 wherein the wavelength conversion material comprises wavelength conversion particles characterized by an average particle-to-particle distance of about less than 10 times the average particle size of all the wavelength-conversion materials.

5. The optical device of claim 1 wherein the wavelength selective surface comprises a filter.

6. The optical device of claim 1 wherein the wavelength selective surface comprises a dichroic optical member.

7. The optical device of claim 1 wherein the wavelength conversion material comprises a first wavelength-conversion material and a second wavelength-conversion material arranged in a pixilated pattern.

8. The device of claim 1 wherein the wavelength conversion material comprises a first wavelength-conversion material stacked on top of a second wavelength-conversion material.

9. The device of claim 1 wherein the wavelength conversion material comprises a first wavelength-conversion material mixed with a second wavelength-conversion material.

10. The device of claim 1 wherein the wavelength conversion material comprises a first wavelength-conversion material and a second wavelength-conversion material.

11. The optical device of claim 1 wherein the wavelength conversion material comprises one of a plurality of quantum dots, a phosphor material, and an organic material.

12. The optical device of claim 1 wherein the at least one LED device is fabricated on gallium and nitrogen containing substrate.

13. The optical device of claim 12 wherein the gallium and nitrogen containing substrate is characterized by a semi-polar or non-polar orientation.

14. An optical device comprising:

a mounting member comprising a surface region;

at least one LED device disposed over a portion of the surface region, the LED device having a top LED surface area;

a layer of wavelength conversion material disposed over a portion of the surface region;

a wavelength selective surface configured to reflect substantially direct emission of the LED device and configured to transmit selected wavelengths of converted emission caused by an interaction with at least the layer of wavelength conversion material and the direct emission of the LED device;

a first volume formed by the LED surface area and a first height connecting the LED surface area and the wavelength selective surface;

a second volume formed by an area of the layer of wavelength conversion material and a second height connecting the layer of wavelength conversion material and wavelength selective surface, the second volume being greater than the first volume, the second region being substantially transparent and substantially free from wavelength conversion materials.

15. The optical device of claim 14 wherein:

the LED devices has surface regions and characterized by a first height from a reference region;

the wavelength conversion material has an upper surface of a second height from the reference region; and

the second height is less than the first height.

16. The optical device of claim 14 wherein the wavelength conversion material comprises wavelength conversion particles characterized by an average particle-to-particle distance of about less than 10 times the average particle size of all the wavelength-conversion materials.

17. The optical device of claim 14 wherein the wavelength selective surface comprises a filter.

18. The optical device of claim 14 wherein the wavelength conversion material comprises a plurality of quantum dots, phosphor material, or organic material.

19. The optical device of claim 14 wherein the at least one LED devices are fabricated on gallium and nitrogen containing substrate.

20. The optical device of claim 19 wherein the gallium and nitrogen containing substrate is characterized by a semi-polar or non-polar orientation.