Lighting device and lighting method

• US 8,310,143 B2
• Filed: 08/22/2007
• Issued: 11/13/2012
• Est. Priority Date: 08/23/2006
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony Paul, Negley, Gerald H.
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): Hollweg, Thomas A
• Application Number:
  US11/843,243
• Publication Number:
  US 20080084685A1
• Time in Patent Office: 1,910 Days
• Field of Search: 313/498, 313/501, 313/502, 313/512
• US Class Current: 313/501
• 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 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/01032 Germanium [Ge]
• CPC Class Codes: H01L 33/502 Wavelength conversion materials

Abstract

A lighting device comprising at least one solid state light emitter and at least one lumiphor. If each solid state light emitter is illuminated and each lumiphor is excited, a mixture of light emitted has x, y color coordinates within an area defined by the coordinates 0.32, 0.40; 0.36, 0,48; 0.43, 0.45; 0.42, 0.42; and 0.36, 0.38. The lumiphor(s) comprises phosphor particles, in the range of from 3 to 7 micrometers (or 5-15, 10-20, or 15-25 micrometers), or having a mean particle size of 5, 10, 15, 20 micrometers. Also, a lighting device comprising at least one emitter and at least one lumiphor in which the lumiphor comprises phosphor particles having sizes as mentioned above, where the lighting device has an efficacy of at least 60 (or 70, or 80) lumens per watt.

Claims

1. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, at least some of said phosphor particles having particle sizes in the range of from about 3 micrometers to about 7 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

2. A lighting device as recited in claim 1, wherein at least 50 weight percent of said phosphor particles have particle sizes in the range of from about 3 micrometers to about 7 micrometers.

3. A lighting device as recited in claim 1, wherein at least 75 weight percent of said phosphor particles have particle sizes in the range of from about 3 micrometers to about 7 micrometers.

4. A lighting device as recited in claim 1, wherein at least 90 weight percent of said phosphor particles have particle sizes in the range of from about 3 micrometers to about 7 micrometers.

5. A lighting device as recited in claim 1, wherein said phosphor particles have a mean particle size of about 5 micrometers.

6. A lighting device as recited in claim 1, wherein said at least one solid state light emitter comprises at least one light emitting diode.

7. A lighting device as recited in claim 6, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

8. A lighting device as recited in claim 1, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

9. A lighting device as recited in claim 1, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

10. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, at least some of said phosphor particles having particle sizes in the range of from about 5 micrometers to about 15 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

11. A lighting device as recited in claim 10, wherein:

the at least one lumiphor comprises phosphor in a weight percentage of from about 3.3 weight percent to about 4.7 weight percent, based on the weight of the lumiphor.

12. A lighting device as recited in claim 10, wherein mixed light exiting the lighting device has x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram selected from among:

a first area enclosed by sixth, seventh, eighth, ninth and tenth line segments, the sixth line segment connecting a sixth point to a seventh point, the seventh line segment connecting the seventh point to a eighth point, the eighth line segment connecting the eighth point to a ninth point, the ninth line segment connecting the ninth point to a tenth point, and the tenth line segment connecting the tenth point to the sixth point, the sixth point having x, y coordinates of 0.4578, 0.4101, the seventh point having x, y coordinates of 0.4813, 0.4319, the eighth point having x, y coordinates of 0.4562, 0.4260, the ninth point having x, y coordinates of 0.4373, 0.3893, and the tenth point having x, y coordinates of 0.4593, 0.3944;

a second area enclosed by eleventh, twelfth, thirteenth, fourteenth and fifteenth line segments, the eleventh line segment connecting a eleventh point to a twelfth point, the twelfth line segment connecting the twelfth point to a thirteenth point, the thirteenth line segment connecting the thirteenth point to a fourteenth point, the fourteenth line segment connecting the fourteenth point to a fifteenth point, and the fifteenth line segment connecting the fifteenth point to the eleventh point, the eleventh point having x, y coordinates of 0.4338, .4030, the twelfth point having x, y coordinates of 0.4562, 0.4260, the thirteenth point having x, y coordinates of 0.4299, 0.4165, the fourteenth point having x, y coordinates of 0.4147, 0.3814, and the fifteenth point having x, y coordinates of 0.4373, 0.3893; and

a third area enclosed by sixteenth, seventeenth, eighteenth, nineteenth and twentieth line segments, the sixteenth line segment connecting a sixteenth point to a seventeenth point, the seventeenth line segment connecting the seventeenth point to a eighteenth point, the eighteenth line segment connecting the eighteenth point to a nineteenth point, the nineteenth line segment connecting the nineteenth point to a twentieth point, and the twentieth line segment connecting the twentieth point to the sixteenth point, the sixteenth point having x, y coordinates of 0.4073, 0.3930, the seventeenth point having x, y coordinates of 0.4299, 0.4165, the eighteenth point having x, y coordinates of 0.3996, 0.4015, the nineteenth point having x, y coordinates of 0.3889, 0.3690, and the twentieth point having x, y coordinates of 0.4147, 0.3814.

13. A lighting device as recited in claim 10, wherein at least 50 weight percent of said phosphor particles have particle sizes in the range of from about 5 micrometers to about 15 micrometers.

14. A lighting device as recited in claim 10, wherein at least 75 weight percent of said phosphor particles have particle sizes in the range of from about 5 micrometers to about 15 micrometers.

15. A lighting device as recited in claim 10, wherein at least 90 weight percent of said phosphor particles have particle sizes in the range of from about 5 micrometers to about 15 micrometers.

16. A lighting device as recited in claim 10, wherein said phosphor particles have a mean particle size of about 10 micrometers.

17. A lighting device as recited in claim 10, wherein said at least one solid state light emitter comprises at least one light emitting diode.

18. A lighting device as recited in claim 17, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

19. A lighting device as recited in claim 10, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

20. A lighting device as recited in claim 10, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

21. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, at least some of said phosphor particles having particle sizes in the range of from about 10 micrometers to about 20 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

22. A lighting device as recited in claim 21, wherein at least 50 weight percent of said phosphor particles have particle sizes in the range of from about 10 micrometers to about 20 micrometers.

23. A lighting device as recited in claim 21, wherein at least 75 weight percent of said phosphor particles have particle sizes in the range of from about 10 micrometers to about 20 micrometers.

24. A lighting device as recited in claim 21, wherein at least 90 weight percent of said phosphor particles have particle sizes in the range of from about 10 micrometers to about 20 micrometers.

25. A lighting device as recited in claim 21, wherein said phosphor particles have a mean particle size of about 15 micrometers.

26. A lighting device as recited in claim 21, wherein said at least one solid state light emitter comprises at least one light emitting diode.

27. A lighting device as recited in claim 26, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

28. A lighting device as recited in claim 21, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

29. A lighting device as recited in claim 21, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

30. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, at least some of said phosphor particles having particle sizes in the range of from about 15 micrometers to about 25 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

31. A lighting device as recited in claim 30, wherein at least 50 weight percent of said phosphor particles have particle sizes in the range of from about 15 micrometers to about 25 micrometers.

32. A lighting device as recited in claim 30, wherein at least 75 weight percent of said phosphor particles have particle sizes in the range of from about 15 micrometers to about 25 micrometers.

33. A lighting device as recited in claim 30, wherein at least 90 weight percent of said phosphor particles have particle sizes in the range of from about 15 micrometers to about 25 micrometers.

34. A lighting device as recited in claim 30, wherein said phosphor particles have a mean particle size of about 20 micrometers.

35. A lighting device as recited in claim 30, wherein said at least one solid state light emitter comprises at least one light emitting diode.

36. A lighting device as recited in claim 35, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nn.

37. A lighting device as recited in claim 30, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

38. A lighting device as recited in claim 30, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

39. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, said phosphor particles having a mean particle size of about 5 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

40. A lighting device as recited in claim 39, wherein said at least one solid state light emitter comprises at least one light emitting diode.

41. A lighting device as recited in claim 40, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

42. A lighting device as recited in claim 39, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

43. A lighting device as recited in claim 39, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

44. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, said phosphor particles having a mean particle size of about 10 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

45. A lighting device as recited in claim 44, wherein said at least one solid state light emitter comprises at least one light emitting diode.

46. A lighting device as recited in claim 45, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

47. A lighting device as recited in claim 44, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

48. A lighting device as recited in claim 44, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

49. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, said phosphor particles having a mean particle size of about 15 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

50. A lighting device as recited in claim 49, wherein said at least one solid state light emitter comprises at least one light emitting diode.

51. A lighting device as recited in claim 50, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

52. A lighting device as recited in claim 49, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

53. A lighting device as recited in claim 49, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

54. A lighting device comprising:

at least one solid state light emitter; and

at least one lumiphor;

wherein;

if each of said at least one solid state light emitter is illuminated and each of said at least one lumiphor is excited, a mixture of light exiting the lighting device that was emitted from said at least one solid state light emitter and light exiting the lighting device that was emitted from said at least one lumiphor would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38, and

said at least one lumiphor comprises phosphor particles, said phosphor particles having a mean particle size of about 20 micrometers,

said lighting device, when supplied with electricity, emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

55. A lighting device as recited in claim 54, wherein said at least one solid state light emitter comprises at least one light emitting diode.

56. A lighting device as recited in claim 55, wherein said at least one light emitting diode, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm.

57. A lighting device as recited in claim 54, wherein said at least one lumiphor, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

58. A lighting device as recited in claim 54, further comprising at least a second solid state light emitter, wherein said second solid state light emitter is a light emitting diode which, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.