LIGHT EMITTING DEVICE HAVING A REFRACTORY PHOSPHOR LAYER

• US 20090322208A1
• Filed: 06/30/2008
• Published: 12/31/2009
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Bridgelux Incorporated
• Original Assignee: Bridgelux Incorporated
• Inventors: Shaikevitch, Alex, Lowery, Chris
• Granted Patent: US 8,410,681 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• 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 33/644 in intimate contact or integrated with parts of the device other than the semiconductor body

Abstract

A light emitting device and method of producing the same is disclosed. The light emitting device includes a transparent thermal conductor layer, a refractory phosphor layer provided on the transparent thermal conductor layer, and a light emitting semiconductor arranged to emit light toward the transparent thermal conductor layer and the refractory phosphor layer.

Claims

1. An apparatus, comprising:

a transparent thermal conductor layer;

a refractory phosphor layer provided on the transparent thermal conductor layer; and

a light emitting semiconductor arranged to emit light toward the transparent thermal conductor layer and the refractory phosphor layer.

2. The apparatus of claim 1, wherein the refractory phosphor layer is fused to the transparent thermal conductor layer.

3. The apparatus of claim 1, wherein the transparent thermal conductor layer is configured to dissipate heat from the refractory phosphor layer.

4. The apparatus of claim 1, further comprising a Bragg mirror provided below the refractory phosphor layer.

5. The apparatus of claim 1, further comprising a recessed housing comprising a cavity, wherein the cavity is hermetically sealed.

6. The apparatus of claim 5, wherein the refractory phosphor layer is crimped to the recessed housing.

7. The apparatus of claim 6, further comprising a metal casing, wherein a portion of the metal casing crimps the refractory phosphor layer to the recessed housing.

8. The apparatus of claim 7, wherein the metal casing is configured to dissipate heat from the refractory phosphor layer.

9. The apparatus of claim 1, wherein the refractory phosphor layer comprises a plurality of phosphor sections.

10. The apparatus of claim 9, wherein the phosphor sections are an array of phosphor dots.

11. The apparatus of claim 9, wherein the phosphor sections are a plurality of separate phosphor patterns.

12. The apparatus of claim 9, wherein at least one of the phosphor sections is configured to produce light of a color different from that of at least another one of the phosphor sections.

13. The apparatus of claim 9, wherein at least one of the phosphor sections comprises phosphor particles of a type different from that of at least another one of the phosphor sections.

14. The apparatus of claim 1, wherein the transparent layer is formed of a material selected from a group consisting of glass, sapphire, and diamond.

15. A light emitting device, comprising:

a refractory phosphor layer fused onto a transparent layer comprising a thermal conductivity greater than that of the refractory phosphor layer.

16. A method for manufacturing a light emitting device, comprising:

depositing at least one phosphor mixture onto a transparent substrate, wherein the phosphor mixture comprises a phosphor powder, a glass frit, and a binder.

17. The method of claim 16, wherein one of the phosphor mixtures is deposited in a first array of phosphor sections and another one of the phosphor mixtures is deposited in a second array of phosphor sections such that the phosphor sections of the first array do not overlap the phosphor sections of the second array.

18. The method of claim 16, wherein at least one of the phosphor mixtures is configured to produce light of a color different from that of at least another one of the phosphor mixtures.

19. The method of claim 16, wherein at least one of the phosphor mixtures comprises phosphor particles of a type different from that of at least another one of the phosphor mixtures.

20. The method of claim 16, further comprising firing the at least one deposited phosphor mixture such that the phosphor mixture is fused to the transparent substrate.

21. A method for manufacturing a light emitting device, comprising:

fusing a refractory phosphor layer onto a transparent thermal conductor layer.

22. The method of claim 21, further comprising crimping the refractory phosphor layer onto a recessed housing.