Lighting device with spectral converter

• US 8,928,219 B2
• Filed: 03/05/2013
• Issued: 01/06/2015
• Est. Priority Date: 03/05/2013
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Chan, Chuan Hoe, Ng, Kwok Yuen, Wong, Kum Soon, Tan, Kheng Leng, Poh, Ju Chin, Ng, Keat Chuan
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US13/785,895
• Publication Number:
  US 20140252943A1
• Time in Patent Office: 672 Days
• Field of Search: 313/498, 313/500, 313/502
• US Class Current: 313/498
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• 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 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces

Abstract

In one embodiment, a light-emitting device having a body, a reflector, a light source die, and a spectral converter is disclosed. The spectral converter may be formed adjacent to, but distanced away from, the light source die. The spectral converter may be configured to spectrally adjust a portion of the light output having a predetermined spectral content. In another embodiment, a system for illumination having a plurality of lighting assemblies is disclosed. Each of the lighting assemblies comprises a spectral converter configured to spectrally adjust a portion of the light output so that the plurality of lighting assemblies are configured to emit substantially similar spectral output. In yet another embodiment, a lighting apparatus having the spectral converter is disclosed.

Claims

1. A system for illumination comprising:

a plurality of lighting assemblies having substantially similar assembly spectral outputs;

each member of the plurality of lighting assemblies comprising a respective light source die having a respective source spectral output, and a respective spectral converter selected to adjust a respective portion of the respective source spectral output into a respective converted spectral output;

wherein the spectral converters are selected to be different from one another, and are selected to adjust the portions of the source spectral outputs differently; and

wherein the respective source spectral output of each member of the plurality of lighting assemblies is mixed with the respective converted spectral output to provide the respective assembly spectral output.

2. A system as recited in claim 1 wherein:

the respective assembly spectral output of each member of the plurality of lighting assemblies is a respective spectral summation of the respective source spectral output and the respective converted spectral output; and

the spectral converters are selected to adjust the portions of the source spectral outputs differently, so that the spectral summations of the assembly spectral outputs are substantially similar to one another.

3. A system as recited in claim 1 wherein each of the plurality of lighting assemblies further comprises a respective reflector arranged adjacent to the respective light source die.

4. A system as recited in claim 3 wherein the respective spectral converter is formed on the reflector and located adjacent to, but distanced from, the light source die.

5. A system as recited in claim 1 wherein each of the spectral converters comprises a respective set of a respective plurality of different spectral converting materials.

6. A system as recited in claim 5 wherein one of the corresponding members of spectral converting materials comprises a color pigment that is present in the sets in substantially different amounts.

7. A system as recited in claim 1, wherein each member of the plurality of lighting assemblies forms a portion of a camera flash.

8. A light-emitting device configured to produce a light output having a predetermined spectral content, comprising:

a body;

at least one reflective surface of the body;

a light source die attached on the at least one reflective surface, the light source die being configured to emit light; and

a spectral converter formed on the at least one reflective surface adjacent to but distanced away and substantially surrounding the light source die,

wherein the spectral converter is configured to adjust the light emitted from the light source die such that the light output of the light-emitting device has a spectral content substantially similar to the predetermined spectral content.

9. A light-emitting device as recited in claim 8 wherein the spectral converter comprises a plurality of spectral converting materials, and each member of the plurality of spectral converting materials is configured to generate converted light of differing wavelengths respectively.

10. A light-emitting device as recited in claim 9 wherein one member of the plurality of spectral converting materials is configured to selectively shift a predetermined wavelength of light.

11. A light-emitting device as recited in claim 9 wherein one member of the plurality of spectral converting materials is configured to selectively reduce intensity of light having a predetermined wavelength.

12. A light-emitting device as recited in claim 9 wherein each of the plurality of spectral converting materials is configured to adjust a portion of the light predominantly with respect to a single color.

13. A light-emitting device as recited in claim 9 wherein:

the plurality of spectral converting material are arranged in a plurality of strips; and

each strip comprises in substantial quantity of one of the plurality of spectral converting materials.

14. A light-emitting device as recited in claim 13, wherein the plurality of strips are arranged in concentric curvatures.

15. A light-emitting device as recited in claim 13, wherein the plurality of strips are arranged in concentric rings.

16. A light-emitting device as recited in claim 9 wherein each member of the spectral converting materials comprises at least one of a fluorescent material, a phosphorescent material and a color pigment.

17. A light-emitting device as recited in claim 8 wherein the spectral converter is distributed substantially evenly on a portion of the at least one reflective surface.

18. A lighting apparatus configured to produce a light output, comprising:

a body;

a reflective surface of the body;

at least one light source coupled to the reflective surface, the at least one light source being configured to emit a first light ray having a first color rendering index; and

a spectral converter formed on a portion of the reflective surface adjacent to the at least one light source and configured such that a portion of the first light ray that is reflected through the spectral converter is spectrally adjusted into a second light ray;

wherein the reflective surface and the spectral converter are configured to intermix the first and second light rays and to direct the first and second light rays towards a predetermined direction, so as to provide the light output of the lighting apparatus,

wherein the light output of the lighting apparatus has a second color rendering index that is substantially larger than the first color rendering index of the first light ray of the at least one light source.

19. The lighting apparatus of claim 18, wherein the at least one light source comprises at least one package light-emitting device configured to produce white light.

20. The lighting apparatus of claim 18, wherein the at least one light source further comprises at least one package light-emitting device configured to produce light of substantially one color selected from red, green, blue, cyan, magenta and yellow.