LED array package

• US 10,205,069 B2
• Filed: 07/31/2014
• Issued: 02/12/2019
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: Bridgelux Incorporated
• Original Assignee: Bridgelux Incorporated
• Inventors: Odnoblyudov, Vladimir, West, Scott, Basceri, Cem, Gan, Zhengqing
• Primary Examiner(s): Truong, Bao Q
• Assistant Examiner(s): Ulanday, Meghan
• Application Number:
  US14/449,142
• Publication Number:
  US 20160035950A1
• Time in Patent Office: 1,657 Days
• Field of Search: 362362
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

Various aspects of a light emitting apparatus includes a substrate. Various aspects of the light emitting apparatus include a light emitting die arranged on the substrate. The light emitting die includes one or more side walls. Various aspects of the light emitting apparatus include a reflective die attach material extending along the one or more side walls of the light emitting die.

Claims

1. A light emitting apparatus comprising:

a base substrate;

a light emitting die having a substrate and an active region configured to emit light, with the light emitting die disposed on the base substrate and the substrate of the light emitting die having one or more side walls extending in a vertical direction orthogonal to the base substrate; and

a reflective die attach material configured to attach the light emitting die to the base substrate,

wherein the reflective die attach material extends in the vertical direction and covers at least a portion of an outer side of the one or more side walls of the substrate of the light emitting die.

2. The light emitting apparatus of claim 1, wherein the substrate of the light emitting die is translucent or transparent to the light.

3. The light emitting apparatus of claim 1, wherein the reflective die attach material comprises white epoxy.

4. The light emitting apparatus of claim 3, wherein the white epoxy comprises 10% greater light output than a silver epoxy.

5. The light emitting apparatus of claim 1, wherein the reflective die attach material extends along at least half of a height of the outer side of the one or more side walls.

6. The light emitting apparatus of claim 1, wherein the light emitting die comprises a gallium nitride layer over an aluminum nitride substrate.

7. The light emitting apparatus of claim 6, further comprising a layer reflective to the light between the gallium nitride layer and the aluminum nitride substrate.

8. The light emitting apparatus of claim 1, wherein the light emitting die comprises a vertical LED.

9. The light emitting apparatus of claim 1, further comprising one or more additional light emitting dies arranged on the base substrate and being configured to emit light.

10. The light emitting apparatus of claim 9, further comprising a phosphor layer covering the light emitting dies, wherein the phosphor layer is configured to scatter the light.

11. The light emitting apparatus of claim 10, wherein the reflective die attach material is configured to prevent absorption of the scattered light.

12. The light emitting apparatus of claim 1, wherein the reflective die attach material extends in the vertical direction and completely covers the outer side of the one or more side walls of the substrate of the light emitting die only up to at most the active region.

13. A light emitting apparatus comprising:

a substrate;

a light emitting die configured to emit light, the light emitting die being arranged on the substrate and having a carrier substrate translucent or transparent to the light; and

a layer arranged over the carrier substrate, the layer being reflective to the light and in contact and extending along side walls of the carrier substrate of the light emitting die,

wherein the side walls of the carrier substrate of the light emitting die extend in a direction orthogonal to a surface of the substrate.

14. The light emitting apparatus of claim 13, wherein the light emitting die comprises a vertical LED.

15. The light emitting apparatus of claim 13, wherein the carrier substrate comprises aluminum nitride.

16. The light emitting apparatus of claim 13, further comprising one or more additional light emitting dies arranged on the substrate and configured to emit light.

17. The light emitting apparatus of claim 16, further comprising a phosphor layer covering the light emitting dies, wherein the phosphor layer is configured to scatter the light.

18. The light emitting apparatus of claim 13, wherein the reflective die attach material extends in the vertical direction and completely covers the outer side of the one or more side walls of the substrate of the light emitting die only up to at most an active region of the carrier substrate.

19. A lamp comprising:

a housing;

a light emitting apparatus coupled to the housing, the light emitting apparatus comprising;

a base substrate;

a plurality of light emitting dies each having a substrate and an active region configured to emit light, with the light emitting dies disposed on the base substrate and the substrate of the light emitting die having one or more side walls extending in a vertical direction orthogonal to the base substrate; and

a reflective die attach material configured to attach each of the plurality of light emitting dies to the base substrate,

wherein the reflective die attach material extends in the vertical direction and covers at least a portion of respective outer sides of the one or more side walls of the substrate each of the plurality of light emitting dies.

20. The lamp of claim 19, wherein the plurality of light emitting dies comprises a plurality of vertical LEDs.

21. The lamp of claim 20, further comprising a material over the vertical LEDs to scatter the light.

22. The lamp of claim 21, wherein the light scattering material comprises phosphor.

23. The lamp of claim 21, wherein the reflective die attach material is configured to prevent absorption of the scattered light between the plurality of vertical LEDs.

24. The light emitting apparatus of claim 20, wherein the reflective die attach material extends in the vertical direction and completely covers the outer side of the one or more side walls of the substrate of the light emitting dies only up to at most the active region of each of the plurality of light emitting dies, respectively.