LED lamps

• US 8,592,856 B2
• Filed: 09/14/2012
• Issued: 11/26/2013
• Est. Priority Date: 11/19/1997
• Status: Expired due to Fees

• Current Assignee: Epistar Corporation
• Original Assignee: Epistar Corporation
• Inventors: Salam, Hassan P. A.
• Primary Examiner(s): STARK, JARRETT J
• Application Number:
  US13/617,715
• Publication Number:
  US 20130009186A1
• Time in Patent Office: 438 Days
• Field of Search: 257/94, 257/99, 257/E33.062
• US Class Current: 257/99
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 25/0756 Stacked arrangements of devices
• 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 33/0093 Wafer bonding; Removal of the growth substrate
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/382 the electrode extending partially in or entirely through the semiconductor body
• CPC Class Codes: H01L 33/405 Reflective materials
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/64 Heat extraction or cooling elements

Abstract

A high power LED lamp has a GaN chip placed over an AlGaInP chip. A reflector is placed between the two chips. Each of the chips has trenches diverting light for output. The chip pair can be arranged to produce white light having a spectral distribution in the red to blue region that is close to that of daylight. Also, the chip pair can be used to provide an RGB lamp or a red-amber-green traffic lamp. The active regions of both chips can be less than 50 microns away from a heat sink.

Claims

1. A light source, comprising:

a semiconductor core comprising;

a top surface;

a lower surface; and

an active region arranged between the top surface and the lower surface, and configured to generate light with a wavelength;

a first inner terminal electrically connected to the semiconductor core;

one or more first conductors connected to the first inner terminal;

a first outer terminal having at least two outer surfaces, and electrically connected to the first inner terminal;

a first translucent material arranged on the top surface, and exposing the at least two outer surfaces; and

a glass sheet arranged on the lower surface.

2. The light source of claim 1, further comprising a second translucent material arranged on the lower surface, and having a thickness greater than the wavelength.

3. The light source of claim 2, wherein the second translucent material is wider than the semiconductor core.

4. The light source of claim 1, further comprising a lens arranged on the lower surface.

5. The light source of claim 1, further comprising a reflective surface arranged on the top surface, and configured to reflect the light passing through the semiconductor core.

6. The light source of claim 1, wherein the semiconductor core further comprises a second conductor arranged on the one or more first conductors.

7. The light source of claim 6, wherein the semiconductor core further comprises insulation arranged between the one or more first conductors and the second conductor.

8. A light source, comprising:

a semiconductor core comprising;

a top surface;

a lower surface; and

an active region arranged between the top surface and the lower surface, and configured to generate light with a wavelength;

a first inner terminal electrically connected to the semiconductor core;

a metallic track passing though the active region and not exceeding the lower surface;

a first outer terminal having at least two outer surfaces, and electrically connected to the first inner terminal;

a first translucent material arranged on the top surface, and exposing the at least two outer surfaces; and

a glass sheet arranged on the lower surface.

9. The light source of claim 8, further comprising a second translucent material arranged on the lower surface, and having a thickness greater than the wavelength.

10. The light source of claim 8, wherein the second translucent material is wider than the semiconductor core.

11. The light source of claim 8, further comprising a lens arranged on the lower surface.

12. The light source of claim 8, further comprising a reflective surface arranged on the top surface, and configured to reflect the light passing through the semiconductor core.

13. The light source of claim 8, wherein the semiconductor core further comprises an insulator between the metallic track and the active region.

14. The light source of claim 8, wherein the semiconductor core further comprises insulation arranged between the first translucent material and the top surface.

15. A light source, comprising:

a semiconductor core comprising;

a top surface;

a lower surface; and

an active region arranged between the top surface and the lower surface, and configured to generate light with a wavelength;

a first inner terminal electrically connected to the semiconductor core;

a second inner terminal electrically connected to the semiconductor core;

a first outer terminal having at least two first outer surfaces, and electrically connected to the first inner terminal;

a second outer terminal having at least two second outer surfaces, and electrically connected to the second inner terminal;

a first translucent material arranged on the top surface, and exposing the at least two first outer surfaces and the at least two second outer surfaces; and

a second translucent material arranged on the lower surface, and having a thickness greater than the wavelength.

16. The light source of claim 15, further comprising a glass sheet arranged on the lower surface.

17. The light source of claim 16, wherein the second translucent material is wider than the semiconductor core.

18. The light source of claim 15, further comprising a lens arranged on the lower surface.

19. The light source of claim 15, further comprising a reflective surface arranged on the top surface, and configured to reflect the light passing through the semiconductor core.

20. The light source of claim 15, wherein the semiconductor core further comprises insulation arranged between the first translucent material and the top surface.