LIGHTING DEVICE

• US 20100270567A1
• Filed: 04/28/2010
• Published: 10/28/2010
• Est. Priority Date: 04/28/2009
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: McClear, Mark Terrence, Emerson, David Todd, Kim, Wooh Jae
• Granted Patent: US 8,957,435 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/12032 Schottky diode
• CPC Class Codes: H01L 2924/19107 off-chip wires
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H05B 31/50 specially adapted for ac
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light emission package includes multiple colored solid state emitters each having a different non-white dominant wavelength in the visible range, and at least one lumiphor arranged to receive emissions from at least one other solid state emitter, with each emitter arranged on or adjacent to a common submount. The at least one other emitter and lumiphor may be arranged in combination to emit white light. Each emitter is independently controllable, permitting color and/or color temperature of a lighting device to be varied during operation of the device. At least one white emitter may be combined with red, green, and blue LEDs.

Claims

1. A light emission package comprising:

a first solid state emitter having a first dominant wavelength in the visible range;

a second solid state emitter having a second dominant wavelength in the visible range;

a third solid state emitter having a third dominant wavelength in the visible range;

a fourth solid state emitter having a fourth dominant wavelength; and

a first lumiphor arranged to receive emissions from the fourth solid state emitter and responsively emit a first lumiphor emission spectrum;

wherein each of the first, second, third, and fourth solid state emitter is independently controllable and is disposed on or adjacent to a common submount; and

wherein each of the first dominant wavelength, second dominant wavelength, and third dominant wavelength is non-coincident with the other.

2. The light emission package of claim 1, wherein the fourth dominant wavelength is in the visible range.

3. The light emission package of claim 1, wherein the first lumiphor in combination with the fourth solid state emitter generates a spectral output encompassing the first, second, and third dominant wavelength.

4. The light emission package of claim 1, wherein the first lumiphor in combination with the fourth solid state emitter is arranged to output white light.

5. The light emission package of claim 4, wherein the first dominant wavelength is substantially red, the second dominant wavelength is substantially green, and the third dominant wavelength is substantially blue.

6. The light emission package of claim 4, wherein each of the first, second, and third solid state emitter is arranged to output saturated color.

7. The light emission package of claim 1, having an associated controller and an associated at least one sensor, wherein the controller is arranged to independently control each of the first, second, third, and fourth solid state emitter responsive to at least one output signal generated by the at least one sensor.

8. The light emission package of claim 1, wherein each solid state emitter of the first, second, third, and fourth solid state emitter is arranged with lateral edge spacing of less than about 0.2 mm relative to at least one other solid state emitter of the first, second, third, and fourth solid state emitter.

9. The light emission package of claim 1, wherein each emitter has an emissive facial area, the package has a facial package area, and the ratio of aggregated solid state emitter facial area to total facial package area is at least about 6.3%.

10. The light emission package of claim 1, further comprising an integral leadframe over which each of the first, second, third, and fourth solid state emitter is mounted.

11. The light emission package of claim 10, wherein the integral leadframe is at least partially encased in a molded package body.

12. The light emission package of claim 10, further comprising a submount disposed between the integral leadframe and each of the first, second, third, and fourth solid state emitter, wherein each of the first, second, third, and fourth solid state emitter is mounted to the submount.

13. The light emission package of claim 12, further comprising an electrically inactive thermally conductive heatsink in thermal communication with the submount and arranged to conduct heat away from the first, second, third, and fourth solid state emitter.

14. The light emission package of claim 1, further comprising at least one of a diffusing element and a scattering element arranged to interact with light emitted by at least one of the first, second, third, and fourth solid state emitter.

15. The light emission package of claim 14, wherein the at least one of a diffusing element and a scattering element is arranged in or on an encapsulant arranged over at least one of the first, second, third, and fourth solid state emitter.

16. The light emission package of claim 14, wherein the at least one of a diffusing element and a scattering element is arranged in or on a lens arranged over at least one of the first, second, third, and fourth solid state emitter.

17. The light emission package of claim 14, wherein the at least one of a diffusing element and a scattering element is arranged to interact with fewer than all of the first, second, third, and fourth emitter.

18. The light emission package of claim 14, wherein the at least one of a diffusing element and a scattering element is arranged to interact with each of the first, second, third, and fourth emitter.

19. The light emission package of claim 1, further comprising a second lumiphor arranged to interact with the third solid state emitter and responsively emit a second lumiphor emission spectrum.

20. The light emission package of claim 1, wherein the second lumiphor in combination with the third solid state emitter is arranged to output white light.

21. The light emission package of claim 20, wherein the first lumiphor in combination with the fourth solid state emitter is adapted to output one of cool white, neutral white, and warm white spectra, and the second lumiphor in combination with the third solid state emitter is adapted to output a different one of said cool white, neutral white, and warm white spectra.

22. The light emission package of claim 1, having a total lumen output of at least about 450 lumens.

23. The light emission package of claim 1, having a color rendering index of at least about 90.

24. A lighting device comprising an array of light emission packages, wherein each light emission package comprises a light emission package according to claim 1.

25. The lighting device of claim 24, further comprising a controller operatively arranged to control operation of the array of light emission packages.

26. The lighting device of claim 24, embodied in a backlight for a liquid crystal display.

27. A color changing lighting device comprising at least one light emission package according to claim 1.

28. The color changing lighting device of claim 27, wherein the lighting device comprises a luminaire.

29. A light emission package comprising:

a first solid state emitter having a first emission spectrum in the visible range;

a second solid state emitter having a second emission spectrum in the visible range;

a third solid state emitter having a third emission spectrum in the visible range; and

a first lumiphor arranged to receive at least a portion of the first emission spectrum and responsively emit a lumiphor emission spectrum;

wherein each of the first, second, and third solid state emitter is independently controllable and is disposed on or adjacent to a common submount; and

wherein the first emission spectrum has a first dominant wavelength, and the second emission spectrum has a second dominant wavelength that is non-coincident with the first dominant wavelength.

30. The light emission package of claim 29, further comprising a fourth solid state emitter disposed on or adjacent to the common submount;

wherein the fourth solid state emitter is controllable independently of the first, second, and third solid state emitter; and

wherein the fourth solid state emitter has a fourth emission spectrum in the visible range, and the fourth emission spectrum has a dominant wavelength that is non-coincident with each of the first and the second dominant wavelength.

31. The light emission package of claim 29, further comprising an integral leadframe over which each of the first, second, and third solid state emitter is mounted.

32. The light emission package of claim 31, further comprising a submount disposed between the integral leadframe and each of the first, second, and third solid state emitter, wherein each of the first, second, and third solid state emitter is mounted to the submount.

33. The light emission package of claim 31, wherein the integral leadframe is at least partially encased in a molded package body.

34. The light emission package of claim 29, having a total lumen output of at least about 450 lumens.