LIGHT EMITTING DEVICE HAVING A TRANSPARENT THERMALLY CONDUCTIVE LAYER

• US 20090322197A1
• 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: Helbing, Rene
• Granted Patent: US 8,159,131 B2
• Time in Patent Office: Days
• US Class Current: 313/46
• 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 33/507 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 thermally conductive layer, a phosphor layer provided on the transparent thermally conductive layer, and at least one light emitting semiconductor arranged to emit light toward the transparent thermally conductive layer and the phosphor layer.

Claims

1. An apparatus, comprising:

a transparent thermally conductive layer;

a phosphor layer provided on the transparent thermally conductive layer; and

at least one light emitting semiconductor arranged to emit light toward the transparent thermally conductive layer and the phosphor layer.

2. The apparatus of claim 1, wherein the transparent thermally conductive layer is configured to dissipate heat from the phosphor layer.

3. The apparatus of claim 1, wherein the transparent thermally conductive layer thermally couples the phosphor layer to a heat sink.

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

5. The apparatus of claim 4, wherein the phosphor sections are an array of phosphor dots.

6. The apparatus of claim 4, wherein the phosphor sections are a plurality of separate phosphor patterns.

7. The apparatus of claim 4, wherein the phosphor sections are a plurality of phosphor layers stacked one on top of another.

8. The apparatus of claim 7, wherein each of the plurality of phosphor layers are stacked in an alternating manner with each of a plurality of transparent thermally conductive layers.

9. The apparatus of claim 8, wherein each of the plurality of phosphor layers are thermally coupled to a heat sink via at least one of the plurality of transparent thermally conductive layers.

10. The apparatus of claim 4, 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.

11. The apparatus of claim 4, 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.

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

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

14. An apparatus, comprising:

a stack of layers comprising at least one transparent thermally conductive layer and at least one phosphor layer; and

at least one light emitting semiconductor arranged to emit light toward the stack.

15. The apparatus of claim 14, wherein the at least one transparent thermally conductive layer and the at least one phosphor layer are stacked in an alternating manner.

16. The apparatus of claim 14, wherein the at least one transparent thermally conductive layer is configured to dissipate heat from the at least one phosphor layer.

17. A light emitting device, comprising:

at least one phosphor layer provided on a transparent thermally conductive layer comprising a thermal conductivity greater than that of the at least one phosphor layer.

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

depositing at least one phosphor mixture onto a transparent thermally conductive layer.

19. The method of claim 18, 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.

20. The method of claim 18, 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.

21. The method of claim 18, 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.