Variable correlated color temperature luminary constructs

Patent metadata

Field	Value
Publication number	US-9642208-B2
Application number	US-201113170733-A
Country	US
Kind code	B2
Filing date	Jun 28, 2011
Priority date	Jun 28, 2011
Publication date	May 2, 2017
Grant date	May 2, 2017

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.

First claim

I claim:

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 differently excited by the at least two excitation peak emissions of different wavelength; and at least two operational states comprising:
a first operational 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 the at least two peak emissions of different wavelengths are altered from that of the first operation state and emission by the at least one phosphor material upon excitation by the altered 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;
wherein the color rendering index (CRI) values of both the first and the second operational states are at least 81 for CCT values of between 2200 to 4500.

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 difference between the first CCT value and the at least one additional CCT value is greater than 50K.

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

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

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

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

14. 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.

15. 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.

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 the same excitation peak emission wavelength of more or less intensity.

17. 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.

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

19. The lighting device of claim 18 , 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.

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

21. 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.

22. 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.

23. 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 differently excited by the at least two excitation peak emissions of different wavelength; and at least two operational states comprising:
a first 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 a first correlated color temperature (CCT) value for the lighting device; and
at least one additional operational state wherein at least one of the at least two peak emissions of different wavelengths is altered from that of the first operation state and emission by the at least one phosphor material upon excitation by at least one of the altered 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;
wherein the color rendering index (CRI) values of both the first and the second operational states are at least 81 for CCT values of between 2200 to 4500.

24. The lighting device of claim 23 , wherein the at least one phosphor material includes two or more phosphor materials.

25. The lighting device of claim 23 , 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.

26. The lighting device of claim 23 , 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 pro

Assignees

• Van De Ven Antony P
• Cree Inc

Inventors

• Van De Ven Antony P

Classifications

• F21K9/64 Primary

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• H05B45/22

  using optical feedback · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title

• F21V9/06

  for filtering out ultraviolet radiation · CPC title