Solid state lighting device including multiple wavelength conversion materials

• US 8,884,508 B2
• Filed: 11/09/2011
• Issued: 11/11/2014
• Est. Priority Date: 11/09/2011
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul Kenneth, Negley, Gerald H.
• Primary Examiner(s): RALEIGH, DONALD L
• Application Number:
  US13/292,577
• Publication Number:
  US 20130114242A1
• Time in Patent Office: 1,098 Days
• US Class Current: 313/501
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]

Abstract

A solid state lighting device includes a solid state light emitter combined with a lumiphor to form a solid state light emitting component, at least one lumiphor spatially segregated from the light emitting component, and another lumiphor and/or solid state light emitter. The solid state light emitting component may include a blue shifted yellow component with a higher color temperature, but in combination with the other elements the aggregated emissions from the lighting device have a lower color temperature. Multiple white or near-white components may be provided and arranged to stimulate one or more lumiphors spatially segregated therefrom.

Claims

1. A lighting device comprising:

at least one first light emitting component including at least one electrically activated first solid state light emitter adapted to emit a peak wavelength in a range of from 430 to 480 nm, and including at least one first wavelength conversion material covering at least a portion of the at least one first solid state light emitter and adapted to emit a peak wavelength in a range of from 550 to 599 nm;

a second wavelength conversion material spatially segregated from the at least one first light emitting component, arranged to receive emissions from the at least one first light emitting component, and adapted to emit a peak wavelength in a range of from 500 to 560 nm; and

an electrically activated second solid state light emitter adapted to emit a peak wavelength in a range of from 600 to 660 nm.

2. A lighting device according to claim 1, wherein the second wavelength conversion material is arranged to receive emissions from the second solid state light emitter.

3. A lighting device according to claim 1, wherein the second solid state light emitter is independently controllable relative to the at least one first solid state light emitter.

4. A lighting device according to claim 1, further comprising a third wavelength conversion material spatially segregated from the at least one first light emitting component, arranged to receive emissions from the at least one first light emitting component, and adapted to emit a peak wavelength in a range of from 600 to 660 nm.

5. A lighting device according to claim 4, wherein the second wavelength conversion material and the third wavelength conversion material are arranged within a single layer or dispersed within a unitary medium.

6. A lighting device according to claim 4, wherein the second wavelength conversion material is arranged in one conversion material layer, and the third wavelength conversion material is arranged in another, distinct conversion material layer.

7. A lighting device according to claim 4, wherein the second wavelength conversion material and the third wavelength conversion material are arranged over different areas of at least one lumiphor support element that is spatially segregated from the at least one first light emitting component.

8. A lighting device according to claim 7, wherein the different areas of at least one lumiphor support element are non-overlapping relative to one another.

9. A lighting device according to claim 4, wherein the second wavelength conversion material is arranged in or on a first lumiphor support element and the third wavelength conversion material is arranged in or on a second lumiphor support element, and wherein the first lumiphor support element and the second lumiphor support element are spatially segregated from the at least one first solid state light emitter.

10. A lighting device according to claim 1, wherein the at least one first wavelength conversion material is contained within a coating or binding medium, and the coating or binding medium is arranged in contact with the at least one first solid state light emitter.

11. A lighting device according to claim 1, further comprising a third solid state light emitter adapted to emit a peak wavelength in a range of from 481 to 499 nm.

12. A lighting device according to claim 11, wherein the third solid state light emitter is independently controllable relative to the at least one first solid state light emitter.

13. A lighting device according to claim 4, wherein:

the at least one first solid state light emitter includes multiple first solid state light emitters;

the second wavelength conversion material is arranged to receive emissions from one first solid state light emitter of the multiple first solid state light emitters; and

the third wavelength conversion material is arranged to receive emissions from an other first solid state light emitter of the multiple first solid state light emitters.

14. A lighting device according to claim 13, wherein the other first solid state light emitter is independently controllable relative to the one first solid state light emitter.

15. A lighting device according to claim 7, wherein the at least one first solid state light emitter includes multiple first solid state light emitters;

the second wavelength conversion material is arranged to receive emissions from one first solid state light emitter of the multiple first solid state light emitters; and

the third wavelength conversion material is arranged to receive emissions from an other first solid state light emitter of the multiple first solid state light emitters.

16. A lighting device according to claim 1, wherein aggregated emissions from the lighting device produce a mixture of light having x, y coordinates on a 1931 CIE Chromaticity Diagram that define a first point within four MacAdam ellipses of a reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram.

17. A lighting device according to claim 16, wherein the reference point has a color temperature of less than or equal to 4000 K.

18. A lighting device according to claim 16, wherein the reference point has a color temperature of less than or equal to 3500 K.

19. A lighting device according to claim 1, wherein the second wavelength conversion material is adapted to emit a peak wavelength in a range of from 500 to 549 nm.

20. A lighting device according to claim 1, comprising at least one of a lens, a diffuser, and a scattering material arranged to receive emissions from the at least one first light emitting component and the second wavelength conversion material.

21. A lighting device according to claim 2, comprising at least one of the following features (i) to (iv):

(i) a single leadframe arranged to conduct electrical power to the second solid state light emitter and the at least one first solid state light emitter;

(ii) a single reflector arranged to reflect at least a portion of light emanating from the second solid state light emitter and the at least one first solid state light emitter;

(iii) a single submount supporting the second solid state light emitter and the at least one first solid state light emitter; and

(iv) a single lens arranged to transmit at least a portion of light emanating from each of the second solid state light emitter and the at least one first solid state light emitter.

22. A lighting device according to claim 1, wherein combined emissions from the lighting device embody at least one of (a) a color rendering index (CRI Ra) value of at least 85, and (b) a color quality scale (CQS) value of at least 85.

23. A method comprising illuminating an object, a space, or an environment, utilizing a lighting device according to claim 1.

24. A lighting device comprising:

at least one first light emitting component including at least one electrically activated first solid state light emitter and a first wavelength conversion material covering at least a portion of the at least one first solid state light emitter, wherein a combination of light exiting the at least one first light emitting component including emissions generated by the at least one first solid state light emitter and the at least one first wavelength conversion material produces a mixture of light having x, y coordinates on a 1931 CIE Chromaticity Diagram that define a first point within ten MacAdam ellipses of at least one first reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram;

a second wavelength conversion material spatially segregated from the at least one first light emitting component, arranged to receive emissions from the at least one first light emitting component and responsively convert a portion of the emissions from the at least one first light emitting component to generate second wavelength conversion material emissions; and

at least one of the following items (a) and (b);

(a) an electrically activated second solid state light emitter adapted to emit a peak wavelength differing from (i) a peak wavelength of the at least one first solid state light emitter, (ii) a peak wavelength of the at least one first wavelength conversion material, and (iii) a peak wavelength of the second wavelength conversion material; and

(b) a third wavelength conversion material spatially segregated from the at least one first light emitting component, arranged to receive emissions from the at least one first light emitting component and responsively convert a portion of the emissions from the at least one first light emitting component to generate third wavelength conversion material emissions including a peak wavelength differing from (i) a peak wavelength of the at least one first solid state light emitter, (ii) a peak wavelength of the at least one first wavelength conversion material, and (iii) a peak wavelength of the second wavelength conversion material;

wherein a combination of light exiting the lighting device produces a mixture of light having x, y coordinates on a 1931 CIE Chromaticity Diagram that define a second point within four MacAdam ellipses of at least one second reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram, and wherein a color temperature of the first reference point is at least 1000 K greater than a color temperature of the second reference point.

25. A lighting device according to claim 24, comprising a second solid state light emitter adapted to emit a peak wavelength differing from (i) the peak wavelength of the at least one first solid state light emitter, (ii) the peak wavelength of the at least one first wavelength conversion material, and (iii) the peak wavelength of the second wavelength conversion material.

26. A lighting device according to claim 25, wherein the second solid state emitter is independently controllable relative to the at least one first solid state light emitter.

27. A lighting device according to claim 25, wherein the second solid state light emitter is adapted to emit a peak wavelength in a range of from 600 to 660 nm.

28. A lighting device according to claim 24, comprising a third wavelength conversion material spatially segregated from the at least one first light emitting component, arranged to receive emissions from the at least one first light emitting component and responsively convert a portion of the emissions from the at least one first light emitting component to generate third wavelength conversion material emissions including a peak wavelength differing from (i) the peak wavelength of the at least one first solid state light emitter, (ii) the peak wavelength of the at least one first wavelength conversion material, and (iii) the peak wavelength of the second wavelength conversion material.

29. A lighting device according to claim 28, wherein the third wavelength conversion material is adapted to emit a peak wavelength in a range of from 600 to 660 nm.

30. A lighting device according to claim 28, wherein the second wavelength conversion material and the third wavelength conversion material are arranged within a single layer or dispersed within a unitary medium.

31. A lighting device according to claim 28, wherein the second wavelength conversion material is arranged in one conversion material layer, and the third wavelength conversion material is arranged in another, distinct conversion material layer.

32. A lighting device according to claim 28, wherein the second wavelength conversion material and the third wavelength conversion material are arranged over different areas of at least one lumiphor support element that is spatially segregated from the at least one first light emitting component.

33. A lighting device according to claim 32, wherein the different areas of at least one lumiphor support element are non-overlapping relative to one another.

34. A lighting device according to claim 28, wherein the second wavelength conversion material is arranged in or on a first lumiphor support element and the third wavelength conversion material is arranged in or on a second lumiphor support element, and wherein the first lumiphor support element and the second lumiphor support element are spatially segregated from the at least one first light emitting component.

35. A lighting device according to claim 24, wherein the at least one first wavelength conversion material is contained within a coating or binding medium, and the coating or binding medium is arranged in contact with the at least one first solid state light emitter.

36. A lighting device according to claim 24, wherein:

the at least one first solid state emitter includes at least one first solid state emitter adapted to emit a peak wavelength in a range of from 430 to 480 nm;

the at least one first wavelength conversion material is adapted to emit a peak wavelength in a range of from 550 to 590 nm; and

the second wavelength conversion material has a peak wavelength in a range of from 500 to 560 nm.

37. A lighting device according to claim 24, further comprising a third solid state light emitter adapted to emit a peak wavelength in a range of from 481 to 499 nm.

38. A lighting device according to claim 24, comprising at least one of a lens, a diffuser, and a scattering material arranged to receive emissions from the second wavelength conversion material and the at least one first light emitting component.

39. A lighting device according to claim 25, comprising at least one of the following features (i) to (iv):

(i) a single leadframe arranged to conduct electrical power to the second solid state light emitter and the at least one first solid state light emitter;

(ii) a single reflector arranged to reflect at least a portion of light emanating from the second solid state light emitter and the at least one first solid state light emitter;

(iii) a single submount supporting the second solid state light emitter and the at least one first solid state light emitter; and

(iv) a single lens arranged to transmit at least a portion of light emanating from each of the second solid state light emitter and the at least one first solid state light emitter.

40. A lighting device according to claim 28, wherein:

the at least one first solid state light emitter includes multiple first solid state light emitters;

the second wavelength conversion material is arranged to receive emissions from one first solid state light emitter of the multiple first solid state light emitters; and

the third wavelength conversion material is arranged to receive emissions from an other first solid state light emitter of the multiple first solid state light emitters.

41. A lighting device according to claim 40, wherein the other first solid state light emitter is independently controllable relative to the one first solid state light emitter.

42. A lighting device according to claim 32, wherein the at least one first solid state light emitter includes multiple first solid state light emitters;

the second wavelength conversion material is arranged to receive emissions from one first solid state light emitter of the multiple first solid state light emitters; and

the third wavelength conversion material is arranged to receive emissions from an other first solid state light emitter of the multiple first solid state light emitters.

43. A lighting device according to claim 24, wherein combined emissions from the lighting device embody at least one of (a) a color rendering index (CRI Ra) value of at least 85, and (b) a color quality scale (CQS) value of at least 85.

44. A lighting device according to claim 24, wherein the second reference point is less than 4000 K.

45. A lighting device according to claim 24, wherein the second reference point is less than 3500 K.

46. A method comprising illuminating an object, a space, or an environment, utilizing a lighting device according to claim 24.

47. A lighting device comprising:

a first light emitting component including an electrically activated first solid state light emitter adapted to emit a peak wavelength in a range of from 430 to 480 nm, and including a first wavelength conversion material covering at least a portion of the first solid state light emitter and adapted to emit a peak wavelength in a range of from 550 to 599 nm;

a second light emitting component including an electrically activated second solid state light emitter adapted to emit a peak wavelength in a range of from 430 to 480 nm, and including a second wavelength conversion material covering at least a portion of the second solid state light emitter and adapted to emit a peak wavelength in a range of from 550 to 599 nm;

a third wavelength conversion material spatially segregated from the first light emitting component, arranged to receive emissions from the first light emitting component, and adapted to emit a peak wavelength in a range of from 500 to 549 nm; and

a fourth wavelength conversion material spatially segregated from the second light emitting component, arranged to receive emissions from the second light emitting component, and adapted to emit a peak wavelength in a range of from 600 to 660 nm.

48. A lighting device according to claim 47, wherein the first light emitting component and the second light emitting component are independently controllable relative to one another.

49. A lighting device according to claim 47, comprising at least one of a lens, a diffuser, and a scattering material arranged to receive emissions from the first and the second light emitting component and from the third and the fourth wavelength conversion material.

50. A lighting device according to claim 47, comprising at least one of the following features (i) to (iv):

(i) a single leadframe arranged to conduct electrical power to the first solid state light emitter and the second solid state light emitter;

(ii) a single reflector arranged to reflect at least a portion of light emanating from the first solid state light emitter and the second solid state light emitter;

(iii) a single submount supporting the first solid state light emitter and the second solid state light emitter; and

(iv) a single lens arranged to transmit at least a portion of light emanating from each of the first solid state light emitter and the second solid state light emitter.

51. A lighting device according to claim 47, wherein aggregated emissions from the lighting device produces a mixture of light having x, y coordinates on a 1931 CIE Chromaticity Diagram that define a first point within four MacAdam ellipses of a reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram.

52. A lighting device according to claim 51, wherein the reference point has a color temperature of less than or equal to 4000 K.

53. A lighting device according to claim 51, wherein the reference point has a color temperature of less than or equal to 3500 K.

54. A lighting device according to claim 47, wherein combined emissions from the lighting device embody at least one of (a) a color rendering index (CRI Ra) value of at least 85, and (b) a color quality scale (CQS) value of at least 85.

55. A method comprising illuminating an object, a space, or an environment, utilizing a lighting device according to claim 47.

56. A method according to claim 55, comprising adjusting supply of power to the first solid state light emitter and the second solid state light emitter to adjust any of chromaticity, color temperature, and intensity of aggregate emissions from the lighting device.