LED DEVICE WITH RE-EMITTING SEMICONDUCTOR CONSTRUCTION AND OPTICAL ELEMENT

• US 20070284565A1
• Filed: 06/11/2007
• Published: 12/13/2007
• Est. Priority Date: 06/12/2006
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Haase, Michael A., Miller, Thomas J., Ouderkirk, Andrew J., Leatherdale, Catherine A., Lu, Dong
• Application Number:
  US11/761,078
• Publication Number:
  US 20070284565A1
• Time in Patent Office: Days
• US Class Current: 257/13
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light source includes an LED component having an emitting surface, and an optical element having an input surface in optical contact with the emitting surface. The LED component may be or include an LED such as an LED die capable of emitting light at a first wavelength, in combination with a re-emitting semiconductor construction which includes a second potential well not located within a pn junction. The optical element can be an extractor whose shape is converging, diverging, or a combination thereof.

Claims

1. A light source, comprising:

an LED component having an emitting surface and including an LED and a re-emitting semiconductor construction, the LED being capable of emitting light at a first wavelength, and the re-emitting semiconductor construction including a second potential well not located within a pn junction; and

an optical element having an input surface and an output surface, the input surface being in optical contact with at least a portion of the emitting surface.

2. The light source of claim 1, wherein the second potential well is or includes a quantum well.

3. The light source of claim 1, wherein the LED includes a first potential well located within a pn junction.

4. The light source of claim 1, wherein the emitting surface is a surface of an LED die, and wherein the optical element is disposed between the LED die and the re-emitting semiconductor construction.

5. The light source of claim 4, wherein the re-emitting semiconductor construction is bonded to the output surface of the optical element.

6. The light source of claim 1, wherein the emitting surface is a surface of the re-emitting semiconductor construction, and wherein the re-emitting semiconductor construction is disposed between the LED and the optical element.

7. The light source of claim 6, wherein the re-emitting semiconductor construction is attached to the LED by a bonding layer.

8. The light source of claim 6, wherein the re-emitting semiconductor construction and the LED have a unitary construction, formed on the same semiconductor wafer.

9. The light source of claim 1, wherein the optical element comprises an encapsulant.

10. The light source of claim 1, wherein the optical element comprises an extractor.

11. The light source of claim 1, wherein the optical element comprises a lens.

12. The light source of claim 1, further comprising a patterned low index layer in optical contact with a first portion of the emitting surface, the patterned layer having a first refractive index, and where the input surface of the optical element is in optical contact with a second portion of the emitting surface, the optical element having a second refractive index higher than the first refractive index.

13. The light source of claim 1, further comprising means for totally internally reflecting at least some of the light generated by the LED component back into the LED component, the reflecting means being in optical contact with a first portion of the emitting surface, and wherein the input surface of the optical element is in optical contact with a second portion of the emitting surface different from the first portion.

14. The light source of claim 1, wherein the optical element comprises a first portion that comprises the input surface and that is composed of a first material, and wherein the optical element comprises a second portion that comprises the output end and that is composed of a second material, and wherein the first material has a refractive index greater than that of the second material.

15. The light source of claim 1, wherein the optical element is one of a plurality of optical elements, each such optical element having an input surface;

wherein the optical elements are sized such that the input surfaces are spaced apart from each other and are in optical contact with different portions of the emitting surface.

16. The light source of claim 1, wherein the optical element includes a base, two converging sides, and two diverging sides.

17. The light source of claim 1, wherein the optical element is shaped to direct light emitted by the LED component to produce a side emitting pattern.

18. The light source of claim 1, wherein the optical element includes a base, an apex smaller than the base, and a converging side extending between the base and the apex.

19. The light source of claim 18, wherein the base is the input surface of the optical element, and the base is no greater in size than the emitting surface of the LED component.

20. A graphic display device comprising the light source according to claim 1.

21. An illumination device comprising the light source according to claim 1.