High efficiency lighting device including one or more saturated light emitters, and method of lighting

• US 8,648,546 B2
• Filed: 08/14/2009
• Issued: 02/11/2014
• Est. Priority Date: 08/14/2009
• 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): Owens, Douglas W
• Assistant Examiner(s): PHAM, THAI N
• Application Number:
  US12/541,215
• Publication Number:
  US 20110037409A1
• Time in Patent Office: 1,642 Days
• Field of Search: 315/149, 315/150, 315/152, 315/192, 315/294, 362/227, 362/231, 362/232, 362/234, 362/257, 362/611, 362/612, 362/249.02
• US Class Current: 315/294
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/45147 Copper (Cu) as principal constituent
• 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 2924/00012 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 2924/181 Encapsulation
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A solid state lighting device comprising at least one first light emitter that emits non-saturated non-white light of a first color point, at least one second light emitter that emits saturated non-white light, and a controller configured to control a ratio of light emitted by the first emitter(s) and by the second light emitter(s) to provide non-white light of a second color point. Also, a solid state lighting device comprising at least one first light emitter that emits light within a first area or a second area on a Chromaticity Diagram, and at least one second light emitter, wherein output light is non-white and has a second color point. Also, methods of providing non-white light.

Claims

1. A solid state lighting device comprising:

at least one first light emitter that emits non-saturated non-white light of a first color point;

at least one second light emitter that emits saturated non-white light; and

a controller configured to control a ratio of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter such that a combination of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter is non-saturated, non-white light of a second color point, the first color point within one of a first area on a 1931 CIE Chromaticity Diagram and a second area on a 1931 CIE Chromaticity Diagram,

the first area enclosed by first, second, third, fourth and fifth line segments, the first line segment connecting a first point to a second point, the second line segment connecting the second point to a third point, the third line segment connecting the third point to a fourth point, the fourth line segment connecting the fourth point to a fifth point and the fifth line segment connecting the fifth point to the first point, the first point having x, y coordinates of 0.29, 0.36, the second point having x, y coordinates of 0.32, 0.35, the third point having x, y coordinates of 0.41, 0.43, the fourth point having x, y coordinates of 0.44, 0.49, and the fifth point having x, y coordinates of 0.38, 0.53,

the second area enclosed by sixth, seventh, eighth and ninth line segments, the sixth line segment connecting a sixth point to a seventh point, the seventh line segment connecting the seventh point to an eighth point, the eighth line segment connecting the eighth point to a ninth point, and the ninth line segment connecting the ninth point to the sixth point, the sixth point having x, y coordinates of 0.57, 0.35, the seventh point having x, y coordinates of 0.62, 0.32, the eighth point having x, y coordinates of 0.37, 0.16, and the ninth point having x, y coordinates of 0.40, 0.23.

2. The solid state lighting device of claim 1, wherein the first light emitter comprises a first solid state light emitter that emits light of a first peak emission wavelength and a light conversion material that is excited by light of the first peak emission wavelength to emit broad spectrum light;

and

wherein the second light emitter comprises a second solid state light emitter that emits light of a second peak emission wavelength, different from the first peak emission wavelength.

3. The solid state lighting device of claim 1, wherein the first color point is within one of the first area and the second area with the solid state lighting device at thermal equilibrium.

4. The solid state lighting device of claim 1, wherein the first color point is within one of the first area and the second area with the solid state lighting device at ambient temperature.

5. The solid state lighting device of claim 3, 1, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram.

6. The solid state lighting device of claim 1, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at thermal equilibrium.

7. The solid state lighting device of claim 1, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at ambient temperature.

8. The solid state lighting device of claim 1, wherein the second color point is within a third area on a 1931 CIE Chromaticity Diagram enclosed by tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth and sixteenth line segments, the tenth line segment connecting a tenth point to a eleventh point, the eleventh line segment connecting the 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, the fifteenth line segment connecting the fifteenth point to a sixteenth point, the sixteenth line segment connecting the sixteenth point to the tenth point, the tenth point having x, y coordinates of 0.490, 0.395, the eleventh point having x, y coordinates of 0.530, 0.400, the twelfth point having x, y coordinates of 0.540, 0.380, the thirteenth point having x, y coordinates of 0.545, 0.345, the fourteenth point having x, y coordinates of 0.480, 0.350, the fifteenth point having x, y coordinates of 0.420, 0.345, and the sixteenth point having x, y coordinates of 0.435, 0.375.

9. The solid state lighting device of claim 8, wherein the first color point is within the first area on a 1931 CIF Chromaticity Diagram and the at least one second light emitter that emits saturated non-white light emits light having a peak emission wavelength in the range of from about 600 nm to about 660 nm.

10. The solid state lighting device of claim 8, wherein the first color point is within the second area on a 1931 CIE Chromaticity Diagram and the at least one second light emitter that emits saturated non-white light emits light having a peak emission wavelength in the range of from about 495 nm to about 575 nm.

11. The solid state lighting device of claim 8, wherein the combination of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter has a CRI Ra at least 50.

12. The solid state lighting device of claim 1, wherein the second color point is within one of a fourth area on a 1976 CIE Chromaticity Diagram, a fifth area on a 1976 CIE Chromaticity Diagram, a sixth area on a 1976 CIE Chromaticity Diagram, a seventh area on a 1976 CIE Chromaticity Diagram, an eighth area on a 1976 CIE Chromaticity Diagram, a ninth area on a 1976 CIE Chromaticity Diagram, a tenth area on a 1976 CIE Chromaticity Diagram, and an eleventh area on a 1976 CIE Chromaticity Diagram,

the fourth area comprising a fourth color point having u′

, v′

coordinates of 0.325, 0.520, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the fifth area comprising a fifth color point having u′

, v′

coordinates of 0.150, 0.551, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the sixth area comprising a sixth color point having u′

, v′

coordinates of 0.103, 0.499, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the seventh area comprising a seventh color point having u′

, v′

coordinates of 0.103, 0.402, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the eighth area comprising an eighth color point having u′

, v′

coordinates of 0.152, 0.303, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the ninth area comprising a ninth color point having u′

, v′

coordinates of 0.250, 0.303, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram,

the tenth area comprising a tenth color point having u′

, v′

coordinates of 0.354, 0.344, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram, and

the eleventh area comprising an eleventh color point having u′

, v′

coordinates of 0.354, 0.450, and all color points that are spaced therefrom by a unit distance of not more than 0.02 on the 1976 CIE Chromaticity Diagram.

13. The solid state lighting device of claim 1, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram.

14. The solid state lighting device of claim 13, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at thermal equilibrium.

15. The solid state lighting device of claim 13, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at ambient temperature.

16. The solid state lighting device of claim 13, wherein the saturated non-white light emitted by the at least one second light emitter is of a third color point that is above the blackbody locus of the 1931 CIE Chromaticity Diagram.

17. A solid state lighting device comprising:

at least one first light emitter that emits light which, in an absence of any additional light, has x, y color coordinates which define a first color point which is within one of a first area on a 1931 CIE Chromaticity Diagram and a second area on a 1931 CIE Chromaticity Diagram; and

at least one second light emitter, the at least one second light emitter comprising a second solid state light emitter,

the first area being enclosed by first, second, third, fourth and fifth line segments, the first line segment connecting a first point to a second point, the second line segment connecting the second point to a third point, the third line segment connecting the third point to a fourth point, the fourth line segment connecting the fourth point to a fifth point, and the fifth line segment connecting the fifth point to the first point, the first point having x, y coordinates of 0.29, 0.36, the second point having x, y coordinates of 0.32, 0.35, the third point having x, y coordinates of 0.41, 0.43, the fourth point having x, y coordinates of 0.44, 0.49, and the fifth point having x, y coordinates of 0.38, 0.53,

the second area being enclosed by sixth, seventh, eighth and ninth line segments, the sixth line segment connecting a sixth point to a seventh point, the seventh line segment connecting the seventh point to an eighth point, the eighth line segment connecting the eighth point to a ninth point, and the ninth line segment connecting the ninth point to the sixth point, the sixth point having x, y coordinates of 0.57, 0.35, the seventh point having x, y coordinates of 0.62, 0.32, the eighth point having x, y coordinates of 0.37, 0.16, and the ninth point having x, y coordinates of 0.40, 0.23,

wherein;

when the at least one first light emitter and the at least one second light emitter are illuminated, output light from the lighting device is non-white and has a second color point.

18. The solid state lighting device of claim 17, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram.

19. The solid state lighting device of claim 17, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at thermal equilibrium.

20. The solid state lighting device of claim 17, wherein the second color point is below the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at ambient temperature.

21. The solid state lighting device of claim 17, wherein the second color point is within a third area on a 1931 CIE Chromaticity Diagram enclosed by tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth and sixteenth line segments, the tenth line segment connecting a tenth point to a eleventh point, the eleventh line segment connecting the 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, the fifteenth line segment connecting the fifteenth point to a sixteenth point, the sixteenth line segment connecting the sixteenth point to the tenth point, the tenth point having x, y coordinates of 0.490, 0.395, the eleventh point having x, y coordinates of 0.530, 0.400, the twelfth point having x, y coordinates of 0.540, 0.380, the thirteenth point having x, y coordinates of 0.545, 0.345, the fourteenth point having x, y coordinates of 0.480, 0.350, the fifteenth point having x, y coordinates of 0.420, 0.345, and the sixteenth point having x, y coordinates of 0.435, 0.375.

22. The solid state lighting device of claim 17, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram.

23. The solid state lighting device of claim 17, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at thermal equilibrium.

24. The solid state lighting device of claim 17, wherein the second color point is above the blackbody locus on the 1931 CIE Chromaticity Diagram with the solid state lighting device at ambient temperature.

25. The solid state lighting device of claim 24, wherein the second light emitter emits light of a third color point that is above the blackbody locus of the 1931 CIE Chromaticity Diagram.

26. A method comprising:

illuminating at least one first light emitter to emit light which, in an absence of any additional light, has x, y color coordinates which define a point which is within one of a first area on a 1931 CIE Chromaticity Diagram and a second area on a 1931 CIE Chromaticity Diagram; and

illuminating at least one second light emitter, the at least one second light emitter comprising a second solid state light emitter,

to provide output light from the lighting device, the output light having a non-white color point,

the first area being enclosed by first, second, third, fourth and fifth line segments, the first line segment connecting a first point to a second point, the second line segment connecting the second point to a third point, the third line segment connecting the third point to a fourth point, the fourth line segment connecting the fourth point to a fifth point, and the fifth line segment connecting the fifth point to the first point, the first point having x, y coordinates of 0.29, 0.36, the second point having x, y coordinates of 0.32, 0.35, the third point having x, y coordinates of 0.41, 0.43, the fourth point having x, y coordinates of 0.44, 0.49, and the fifth point having x, y coordinates of 0.38, 0.53,

the second area being enclosed by sixth, seventh, eighth and ninth line segments, the sixth line segment connecting a sixth point to a seventh point, the seventh line segment connecting the seventh point to an eighth point, the eighth line segment connecting the eighth point to a ninth point, and the ninth line segment connecting the ninth point to the sixth point, the sixth point having x, y coordinates of 0.57, 0.35, the seventh point having x, y coordinates of 0.62, 0.32, the eighth point having x, y coordinates of 0.37, 0.16, and the ninth point having x, y coordinates of 0.40, 0.23.

27. A method as recited in claim 26, wherein the method further comprises:

controlling a ratio of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter such that a combination of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter is non-saturated, non-white light of a second color point.

28. The solid state lighting device of claim 27, wherein the combination of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter has a CRI of at least 50 and the combination of the non-white light of the first color point emitted by the at least one first light emitter and the saturated non-white light emitted by the at least one second light emitter is emitted at a wall plug efficiency of at least 10 lumens per watt.

29. The method of claim 26, wherein the output light has a CRI of at least 50 and the output light is emitted at a wall plug efficiency of at least 10 lumens per watt.