Lighting device and lighting method

• US 10,030,824 B2
• Filed: 05/08/2008
• Issued: 07/24/2018
• Est. Priority Date: 05/08/2007
• 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): PAYNE, SHARON E
• Application Number:
  US12/117,131
• Publication Number:
  US 20080278940A1
• Time in Patent Office: 3,729 Days
• Field of Search: 362231, 362 84
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 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 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]

Abstract

A lighting device comprising one or more solid state light emitters which emit near ultraviolet light and one or more lumiphors which emit light having a wavelength in the range of from 555 nm to 585 nm, which in the absence of other light would produce a mixture of light within an area defined by x, y coordinates (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), and (0.36, 0.38). The lighting device may further comprise one or more 600 nm to 630 nm light emitters, and a mixture of light emitted from the lighting device may be within ten MacAdam ellipses of the blackbody locus. Also, packaged solid state light emitters and methods of lighting.

Claims

1. A lighting device comprising:

a first group of solid state light emitters;

a second group of solid state light emitters; and

a first luminescent material;

wherein;

if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the near ultraviolet range;

if electricity is supplied to said second group of solid state light emitters, said second group of solid state light emitters emit light having a peak wavelength in the range of from about 600 nm to about 630 nm;

said first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 555 nm to about 585 nm;

if electricity is supplied to said first group of solid state light emitters, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters and (2) light emitted from said lighting device which was emitted by said first luminescent material 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;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a first string;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a second string;

the first string electrically parallel to the second string;

a first ratio differs from a second ratio;

said first ratio equal to (1) a number of solid state light emitters in said second group of solid state light emitters and in said first string, divided by (2) a number of solid state light emitters in said first group of solid state light emitters and in said first string;

said second ratio equal to (3) a number of solid state light emitters in said second group of solid state light emitters and in said second string, divided by (4) a number of solid state light emitters in said first group of solid state light emitters and in said second string.

2. A lighting device as recited in claim 1, wherein at least one of said first group of solid state light emitters comprises a light emitting diode.

3. A lighting device as recited in claim 1, wherein at least some of said first luminescent material is in a first group of lumiphors comprising at least one lumiphor, and said lighting device comprises at least a first package, said first package comprising at least one of said first group of solid state light emitters and at least one of said first group of lumiphors.

4. A lighting device as recited in claim 1, wherein if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the range of from about 380 nm to about 430 nm.

5. A lighting device as recited in claim 1, wherein if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the range of from about 380 nm to about 410 nm.

6. A lighting device as recited in claim 5, wherein said first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 565 nm to about 570 nm.

7. A lighting device as recited in claim 1, wherein said first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 565 nm to about 570 nm.

8. A lighting device as recited in claim 1, wherein if if electricity is supplied to said lighting device, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters, (2) light emitted from said lighting device which was emitted by said first luminescent material, and (3) light emitted from said lighting device which was emitted by said second group of solid state light emitters would, in the absence of any additional light, have a combined illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within twenty MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

9. A lighting device as recited in claim 1, wherein said lighting device comprises at least a first package, said first package comprising at least one of said first group of solid state light emitters and at least one of said second group of solid state light emitters.

10. A lighting device as recited in claim 1, wherein at least some of said first luminescent material is in a first group of lumiphors comprising at least one lumiphor, and said lighting device comprises at least a first package, said first package comprising at least one of said first group of solid state light emitters, at least one of said first group of lumiphors, and at least one of said second group of solid state light emitters.

11. A lighting device as recited in claim 1, wherein at least one of said second group of solid state light emitters is a light emitting diode.

12. A lighting device as recited in claim 1, wherein said lighting device further comprises a second luminescent material, and the second luminescent material emits light having a dominant wavelength in the range of from about 600 nm to about 630 nm if it is excited.

13. A lighting device as recited in claim 1, wherein at least some of said first luminescent material is in a first group of lumiphors comprising at least one lumiphor, and said lighting device comprises at least a first packaged solid state light emitter and a second packaged solid state light emitter,

said first packaged solid state light emitter comprising a first of said first group of solid state light emitters and a first of said first group of lumiphors;

said second packaged solid state light emitter comprising a second of said first group of solid state light emitters.

14. A lighting device as recited in claim 1, wherein said lighting device further comprises an encapsulant and is in the form of packaged solid state light emitters.

15. A lighting device as recited in claim 1, wherein:

said lighting device further comprises at least a first power line, and

if electricity is supplied to said first power line, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters and (2) light emitted from said lighting device which was emitted by said first luminescent material 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.

16. A lighting device as recited in claim 15, wherein:

if electricity is supplied to said first power line, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters, (2) light emitted from said lighting device which was emitted by said first luminescent material, and (3) light emitted from said lighting device which was emitted by said second group of solid state light emitters would, in the absence of any additional light, have a combined illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within twenty MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

17. A lighting device as recited in claim 15, wherein if electricity is supplied to said first power line, a mixture of all light emitted from said lighting device from solid state light emitters and luminescent material which emit light having a dominant wavelength which is outside the range of between 600 nm and 700 nm would have 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.

18. A lighting device as recited in claim 1, wherein said lighting device is in the form of packaged solid state light emitters.

19. A lighting device as recited in claim 18, wherein at least some of said first luminescent material is in a first group of lumiphors comprising at least one lumiphor, and said packaged solid state light emitters further comprise a second group of lumiphors, and said second group of lumiphors, if excited, would emit light having a dominant wavelength in the range of from about 600 nm to about 630 nm.

20. A lighting device as recited in claim 19, wherein said first group of lumiphors and said second group of lumiphors consist of a single first group-second group lumiphor.

21. A lighting device as recited in claim 19, wherein said lighting device comprises at least a first mixed lumiphor, said first mixed lumiphor comprising at least one of said first group of lumiphors and at least one of said second group of lumiphors.

22. A lighting device as recited in claim 1, wherein if electricity is supplied to said first group of solid state light emitters, said mixture has a CRI Ra of at least 85.

23. A lighting device as recited in claim 1, wherein:

a first portion of light emitted by said first group of solid state light emitters is absorbed by said first luminescent material, and a second portion of light emitted by said first group of solid state light emitters exits said lighting device without being absorbed by said first luminescent material; and

a mixture of light emitted by said first luminescent material and said second portion of light would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within said area on a 1931 CIE Chromaticity Diagram.

24. A method of lighting, comprising:

supplying electricity to a first group of solid state light emitters, such that said first group of solid state light emitters emits light having a peak wavelength in the near ultraviolet range;

exciting a first luminescent material, such that said first luminescent material emits light having a dominant wavelength in the range of from about 555 nm to about 585 nm; and

supplying electricity to a second group of solid state light emitters, such that said second group of solid state light emitters emits light having a peak wavelength in the range of from about 600 nm to about 630 nm,

wherein;

a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters and (2) light emitted from said lighting device which was emitted by said first luminescent material 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;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters are on a first string;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters are on a second string;

the first string is electrically parallel to the second string;

a first ratio differs from a second ratio;

said first ratio is equal to (1) a number of solid state light emitters in said second group of solid state light emitters and in said first string, divided by (2) a number of solid state light emitters in said first group of solid state light emitters and in said first string;

said second ratio is equal to (3) a number of solid state light emitters in said second group of solid state light emitters and in said second string, divided by (4) a number of solid state light emitters in said first group of solid state light emitters and in said second string.

25. A method as recited in claim 24, wherein at least one of said first group of solid state light emitters comprises a light emitting diode.

26. A method as recited in claim 24, wherein light emitted from said first group of solid state light emitters excites said first luminescent material.

27. A method as recited in claim 24, wherein said method further comprises exciting a second luminescent material, such that said second luminescent material emits light having a dominant wavelength in the range of from about 600 nm to about 630 nm.

28. A method as recited in claim 24, wherein a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters, (2) light emitted from said lighting device which was emitted by said first luminescent material, and (3) light emitted from said lighting device which was emitted by said second group of solid state light emitters would, in the absence of any additional light, have a combined illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within twenty MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

29. A method as recited in claim 27, wherein light emitted from said first group of solid state light emitters excites said second luminescent material.

30. A method as recited in claim 27, wherein light emitted from said first group of solid state light emitters excites said first luminescent material and said second luminescent material.

31. A method as recited in claim 24, wherein at least one of said second group of solid state light emitters comprises a light emitting diode.

32. A method as recited in claim 24, wherein said mixture has a CRI Ra of at least 85.

33. A lighting device comprising:

a first group of solid state light emitters;

a second group of solid state light emitters; and

a first luminescent material;

wherein;

if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the near ultraviolet range;

if electricity is supplied to said second group of solid state light emitters, said second group of solid state light emitters emit light having a peak wavelength in the range of from about 600 nm to about 630 nm;

said first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 555 nm to about 585 nm;

if electricity is supplied to said first group of solid state light emitters and said first luminescent material is excited, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters and (2) light emitted from said lighting device which was emitted by said first luminescent material 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;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a first string;

at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a second string;

the first string electrically parallel to the second string;

a first ratio differs from a second ratio;

said first ratio equal to (1) a number of solid state light emitters in said second group of solid state light emitters and in said first string, divided by (2) a number of solid state light emitters in said first group of solid state light emitters and in said first string;

said second ratio equal to (3) a number of solid state light emitters in said second group of solid state light emitters and in said second string, divided by (4) a number of solid state light emitters in said first group of solid state light emitters and in said second string.

34. A lighting device as recited in claim 33, wherein if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the range of from about 380 nm to about 430 nm.