VARIABLE CORRELATED COLOR TEMPERATURE LUMINARY CONSTRUCTS

• US 20130002167A1
• Filed: 06/28/2011
• Published: 01/03/2013
• Est. Priority Date: 06/28/2011
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van de Ven, Antony P.
• Granted Patent: US 9,642,208 B2
• Time in Patent Office: Days
• US Class Current: 315/297
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines

Abstract

A lighting device comprising plural excitation sources configured to provide at least two excitation peak emissions of different wavelength and at least one phosphor material radiationally coupled to the plural light source, the lighting device having a plurality of operational states comprising a first operation state wherein excitation of the at least one phosphor material by a first peak emission from the plural excitation sources provides a first correlated color temperature (CCT) value, and at least one additional operational state wherein excitation of the at least one phosphor material by a second peak emission from the plural excitation sources provides at least one additional CCT value different from the first CCT value. Methods of varying the CCT value using the lighting device with controlled power distribution to the plural excitation sources.

Claims

1. A lighting device comprising:

plural excitation sources configured to provide at least two excitation peak emissions of different wavelength;

at least one phosphor material radiationally coupled to the plural excitation sources; and

at least two operational states comprising;

a first operation state wherein emission by the at least one phosphor material upon excitation by the plural excitation sources contributes to a first correlated color temperature (CCT) value for the lighting device; and

at least one additional operational state wherein emission by the at least one phosphor material upon excitation by the plural excitation sources contributes to at least one additional CCT value for the lighting device, wherein the at least one additional CCT value is different from the first CCT value.

2. The lighting device of claim 1, wherein the at least one phosphor material includes two or more phosphor materials.

3. The lighting device of claim 1, wherein the at least one additional CCT value has different x, y color coordinates, as corresponding to a 1931 CIE chromaticity diagram, compared to the first CCT value.

4. The lighting device of claim 1, wherein the at least one phosphor material has a different relative amount of emission corresponding to each of the at least two peak emissions, and the relative amounts of emission radiation have essentially the same x, y color coordinates as corresponding to a 1931 CIE chromaticity diagram.

5. The lighting device of claim 1, further comprising electrical circuitry configured to selectively control electrical power distribution to the plural excitation sources.

6. The lighting device of claim 1, wherein the electrical power distribution is automatically controlled by an electrical circuit comprising one or more of a timer, motion detector, temperature detector, light detector, humidity detector, and sound detector.

7. The lighting device of claim 1, wherein the electrical power distribution is manually controlled.

8. The lighting device of claim 1, wherein the electrical power distribution is manually controlled by a separate electrical circuit comprising a dimmer switch.

9. The lighting device of claim 1, wherein the at least one additional CCT value provides a color rendering index (CRI) different from the first CCT value.

10. The lighting device of claim 1, wherein the difference between the first CCT value and the at least one additional CCT value is greater than 50K.

11. The lighting device of claim 1, wherein the at least one phosphor material is combined in an optically transparent media.

12. The lighting device of claim 1, wherein the at least one phosphor material is deposited on the plural excitation sources.

13. The lighting device of claim 1, wherein the at least one phosphor material is spatially separated from the plural excitation sources.

14. The lighting device of claim 1, wherein the at least two peak emissions correspond, independently, to UV light and to blue light.

15. The lighting device of claim 1, wherein the at least one phosphor material provides a different relative amount of emission from the at least two excitation peak emissions of the plural excitation sources.

16. The lighting device of claim 1, wherein in the first operation state, emission of the at least one phosphor material of the first operation state is caused by at least one of the excitation peak emissions wavelengths;

and in the at least one additional operational state, emission of the at least one phosphor material is caused by at least a different excitation peak emission wavelength.

17. The lighting device of claim 1, wherein in the first operation state, emission of the at least one phosphor material of the first operation state is caused by at least one of the excitation peak emissions wavelengths;

and in the at least one additional operational state, emission of the at least one phosphor material is caused by at least the same excitation peak emission wavelength of more or less intensity.

18. The lighting device of claim 1, wherein the at least one phosphor material provides a different relative amount of emission corresponding to UV light excitation as compared to blue light excitation.

19. The lighting device of claim 1, wherein the at least one phosphor material comprises red phosphor, green phosphor, and yellow phosphor.

20. The lighting device of claim 19, wherein in the first operation state, emission of at least one of the red phosphor, the green phosphor, and the yellow phosphor is caused by a UV light excitation source, and wherein in the at least one additional operational state, emission of the at least one of the red phosphor, the green phosphor, and the yellow phosphor is excited by a blue light excitation source.

21. The lighting device of claim 1, wherein the plural excitation sources are selected from UV-, blue-, green-, yellow-, and red-emitting LEDs.

22. The lighting device of claim 1, wherein the plural excitation sources comprise at least one UV light emitting LED and at least one blue light emitting LED.

23. The lighting device of claim 1, further comprising one or more filters to reduce or eliminate IR- and UV-light release from the lighting device.

24. A lighting device comprising:

plural spaced-apart LEDs configured to provide at least two excitation peak emissions of different wavelength,

electrical circuitry configured to selectively control electrical power distribution to the plural spaced-apart LEDs;

at least one phosphor material radiationally coupled to the plural spaced-apart LEDs; and

at least two operational states comprising;

a first operation state wherein emission by the at least one phosphor material upon excitation by at least one of the at least two excitation peak emissions contributes to a first correlated color temperature (CCT) value for the lighting device; and

at least one additional operational state wherein emission by the at least one phosphor material upon excitation by at least one of the at least two excitation peak emissions contributes to at least one additional CCT value for the lighting device, wherein the at least one additional CCT value is different from the first CCT value.

25. The lighting device of claim 24, wherein the at least one phosphor material includes two or more phosphor materials.

26. 2The lighting device of claim 24, wherein the plural spaced apart LEDs comprise at least one UV light emitting LED providing at least one of the at least two excitation peak emissions, and at least one blue light emitting LED providing at least one of the at least two excitation peak emissions.

27. The lighting device of claim 24, wherein the plural spaced apart LEDs comprise at least one UV light emitting LED, and at least one blue light emitting LED, wherein the at least one phosphor material provides a different relative amount of emission corresponding to UV light excitation as compared to blue light excitation.

28. The lighting device of claim 24, wherein the at least one phosphor material comprises red phosphor, green phosphor, and yellow phosphor.

29. The lighting device of claim 27, wherein in the first operation state emission of at least one of the red phosphor, the green phosphor, and the yellow phosphor is caused by a UV light emitting LED, and wherein in the at least one additional operational state, emission of the at least one of the red phosphor, the green phosphor, and the yellow phosphor is excited by a blue LED light.

30. The lighting device of claim 24, wherein the at least one phosphor material is combined in an optically transparent media.

31. The lighting device of claim 24, wherein at least one phosphor material is deposited on the plural spaced-apart LEDs and at least one of the phosphor material is spatially separated from the plural spaced-apart LEDs.

32. The lighting device of claim 24, further comprising one or more filters to reduce or eliminate IR- and UV-light release from the lighting device.

33. A method of varying the correlated color temperature (CCT) value of a lighting apparatus, the method comprising the steps of

providing a lighting device, the lighting device comprising:

plural excitation sources providing at least two peak emissions of different wavelengths;

at least one phosphor material radiationally coupled to the plural excitation sources; and

at least two operational states, the operational states comprising;

a first operation state wherein emission by the at least one phosphor material upon excitation by the plural excitation sources contributes to a first correlated color temperature (CCT) value for the lighting device; and

at least one additional operational state wherein emission by the at least one phosphor material upon excitation by the plural excitation sources contributes to at least one additional CCT value for the lighting device, wherein the at least one additional CCT value is different from the first CCT value;

adjusting the relative amount of the at least two peak emissions of different wavelengths.

34. The method of claim 33, further comprising providing electrical circuitry configured to control electrical power distribution to the plural excitation sources.

35. The method of claim 33, wherein the at least one phosphor material includes two or more phosphor materials.

36. The method of claim 33, wherein the at least one additional CCT value has different x, y color coordinates, as corresponding to a 1931 CIE chromaticity diagram, compared to the first CCT value.

37. The method of claim 33, wherein the at least one additional CCT provides a color rendering index (CRI) different from the first CCT level.

38. The method of claim 33, wherein the electrical power distribution is automatically adjustable by a electrical circuit comprising one or more of a timer, motion detector, temperature detector, light detector, and sound detector.

39. The method of claim 33, wherein the electrical power distribution is manually adjustable.

40. The method of claim 33, wherein the difference between the first CCT value and the at least one additional CCT value is greater than 50K.

41. The method of claim 33, wherein the at least two peak emissions correspond, independently, to UV light and to blue light.

42. The method of claim 33, wherein in the first operation state, emission of the at least one phosphor material of the first operation state is caused by at least one of the excitation peak emissions wavelengths;

and in the at least one additional operational state, emission of the at least one phosphor material is caused by at least a different excitation peak emission wavelength.

43. The method of claim 33, wherein in the first operation state, emission of the at least one phosphor material of the first operation state is caused by at least one of the excitation peak emissions wavelengths;

and in the at least one additional operational state, emission of the at least one phosphor material is caused by at least the same excitation peak emission wavelength of more or less intensity.

44. The method of claim 33, wherein the at least one phosphor material is red phosphor, green phosphor, and yellow phosphor.

45. The method of claim 44, wherein in the first operation state emission of at least one of the red phosphor, the green phosphor, and the yellow phosphor is caused by a UV light emitting LED contributing to the first correlated color temperature (CCT) value, and wherein in the at least one additional operational state, emission of the at least one of the red phosphor, the green phosphor, and the yellow phosphor is excited by a blue LED light source contributing to the second correlated color temperature (CCT) value.

46. The method of claim 33, wherein the at least one phosphor material is spatially separated from the plural light source.

47. The method of claim 33, wherein the at least one phosphor material is deposited on the plural light source.

48. The method of claim 33, wherein the plural light source comprises LEDs.

49. The method of claim 33, wherein the at least one phosphor material is deposited on the LEDs and the least one of the phosphor material is spatially separated from the plural spaced-apart LEDs.

50. The method of claim 33, wherein the lighting device further comprising one or more filters to reduce or eliminate IR- and UV-light release from the lighting device.