High color-saturation lighting devices

• US 9,702,524 B2
• Filed: 01/27/2015
• Issued: 07/11/2017
• Est. Priority Date: 01/27/2015
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: van de Ven, Antony Paul, Jacobson, Benjamin A.
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): HORIKOSHI, STEVEN Y
• Application Number:
  US14/606,509
• Publication Number:
  US 20160215938A1
• Time in Patent Office: 896 Days
• 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 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

A lighting device including a blue solid state emitter, at least one yellow-green or green lumiphoric material, and at least one red or red-orange solid state emitter can simultaneously provide high color fidelity (e.g., high CRI Ra), high color saturation (e.g., high Qg), and high efficiency (e.g., lumens per watt). A subcombination of blue and yellow-green emissions is provided within one or more specified regions of a 1931 CIE chromaticity diagram. By providing sufficient green content, increased saturation can be active with relatively a short wavelength red or red-orange source while maintaining high color fidelity and efficacy. A mixture of green and yellow lumiphoric materials may be provided.

Claims

1. A lighting device comprising:

at least one first electrically activated solid state emitter arranged to generate first emissions comprising a dominant wavelength in a blue range;

at least one lumiphoric material arranged to receive at least a portion of the first emissions and produce lumiphor emissions comprising a dominant wavelength in a green or yellow-green range; and

at least one second electrically activated solid state emitter arranged to generate second emissions comprising a dominant wavelength in a red or red-orange range;

wherein a combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a closed shape bounded by a first line having x, y endpoint coordinates of (0.040, 0.329) and (0.309, 0.349), a second line having x, y endpoint coordinates of (0.309, 0.349) and (0.391, 0.509), a third line having x, y endpoint coordinates of (0.391, 0.509) and (0.020, 0.770), and a curve corresponding to a portion of the spectrum locus having x, y endpoint coordinates of (0.020, 0.770) and (0.040, 0.329);

wherein aggregate emissions of the lighting device include at least a portion of the first emissions, at least a portion of the lumiphor emissions, and at least a portion of the second emissions; and

wherein said aggregate emissions comprise a color rendering index (CRI Ra) value of at least 85, said aggregate emissions comprise a correlated color temperature (CCT) value, and said aggregate emissions comprise a relative gamut area (Qg) value of at least the value obtained by the equation 116.5 minus the product of 0.003 times the CCT value.

2. The lighting device of claim 1, wherein the combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a first subregion of the closed shape, wherein the first subregion is bounded by a first line having x, y endpoint coordinates of (0.040, 0.329) and (0.305, 0.349), a second line having x, y endpoint coordinates of (0.305, 0.349) and (0.389, 0.511), a third line having x, y endpoint coordinates of (0.389, 0.511) and (0.020, 0.770), and a curve corresponding to a portion of the spectrum locus having x, y endpoint coordinates of (0.020, 0.770) and (0.040, 0.329).

3. The lighting device of claim 1, wherein the combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a second subregion of the closed shape, wherein the second subregion is bounded by a first line having x, y endpoint coordinates of (0.264, 0.346) and (0.309, 0.349), a second line having x, y endpoint coordinates of (0.309, 0.349) and (0.391, 0.509), a third line having x, y endpoint coordinates of (0.391, 0.509) and (0.337, 0.547), and a fourth line having x, y endpoint coordinates of (0.337, 0.547) and (0.264, 0.346).

4. The lighting device of claim 1, wherein the combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a second subregion of the closed shape, wherein the second subregion is bounded by a first line having x, y endpoint coordinates of (0.264, 0.346) and (0.305, 0.349), a second line having x, y endpoint coordinates of (0.305, 0.349) and (0.389, 0.511), a third line having x, y endpoint coordinates of (0.389, 0.511) and (0.337, 0.547), and a fourth line having x, y endpoint coordinates of (0.337, 0.547) and (0.264, 0.346).

5. The lighting device of claim 1, wherein said aggregate emissions comprise a CRI Ra value of at least 90.

6. The lighting device of claim 1, wherein said aggregate emissions of the lighting device comprise a luminous efficacy of at least 80 lumens per watt.

7. The lighting device of claim 1, wherein said aggregate emissions of the lighting device comprise a luminous efficacy of at least 95 lumens per watt.

8. The lighting device of claim 1, wherein said aggregate emissions comprise a correlated color temperature (CCT) value in a range of from 2000K to 5000K.

9. The lighting device of claim 1, comprising at least one of the following features:

said first emissions comprise a peak wavelength not exceeding 465 nm, or said second emissions comprise a peak wavelength of less than 628 nm.

10. The lighting device of claim 1, wherein:

said at least one lumiphoric material comprises a first lumiphoric material including at least one of lutetium aluminum garnet (LuAG) or green aluminate (GAL) material; and

said at least one lumiphoric material comprises a second lumiphoric material including cerium(III)-doped yttrium aluminum garnet (Ce;

YAG) or yttrium aluminum oxide doped with cerium yttrium aluminum garnet (NYAG) material;

wherein a proportion of the first lumiphoric material to the second lumiphoric material is at least 1;

1.

11. The lighting device of claim 1, wherein the lighting device is devoid of any electrically activated solid state emitter arranged to generate emissions (i) having a dominant wavelength in a range of from 430 nm to 480 nm and (ii) exiting the lighting device without passage through a layer or region comprising a lumiphoric material.

12. The lighting device of claim 1, wherein the lighting device is devoid of any incandescent light emitting element and is devoid of any notch filtering element.

13. A lighting device comprising:

at least one first electrically activated solid state emitter arranged to generate first emissions comprising a dominant wavelength in a blue range;

at least one lumiphoric material arranged to receive at least a portion of the first emissions and produce lumiphor emissions comprising a dominant wavelength in a green or yellow-green range; and

at least one second electrically activated solid state emitter arranged to generate second emissions comprising a dominant wavelength in a red or red-orange range;

wherein a combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a closed shape bounded by a first line having x, y endpoint coordinates of (0.264, 0.346) and (0.309, 0.349), a second line having x, y endpoint coordinates of (0.309, 0.349) and (0.391, 0.509), a third line having x, y endpoint coordinates of (0.391, 0.509) and (0.337, 0.547), and a fourth line having x, y endpoint coordinates of (0.337, 0.547) and (0.264, 0.346);

wherein aggregate emissions of the lighting device include at least a portion of the first emissions, at least a portion of the lumiphor emissions, and at least a portion of the second emissions, and said aggregate emissions comprise a correlated color temperature (CCT) value; and

wherein said aggregate emissions comprise a color rendering index (CRI Ra) value of at least 85, and a relative gamut area (Qg) value of at least the value obtained by the equation 116.5 minus the product of 0.003 times the CCT value.

14. The lighting device of claim 13, wherein the combination of (A) the lumiphor emissions and (B) an unabsorbed portion of the first emissions transmitted through or past the at least one lumiphoric material would, in the absence of any additional light, produce a mixture of light having a color point on a 1931 CIE Chromaticity Diagram including x, y coordinates that define a point on or within a first subregion of the closed shape, wherein the first subregion is bounded by a first line having x, y endpoint coordinates of (0.264, 0.346) and (0.305, 0.349), a second line having x, y endpoint coordinates of (0.305, 0.349) and (0.389, 0.511), a third line having x, y endpoint coordinates of (0.389, 0.511) and (0.337, 0.547), and a fourth line having x, y endpoint coordinates of (0.337, 0.547) and (0.264, 0.346).

15. The lighting device of claim 13, wherein said aggregate emissions comprise a luminous efficacy of at least 80 lumens per watt, and a R9 color rendering value of at least 50.

16. The lighting device of claim 13, wherein said aggregate emissions comprise a luminous efficacy of at least 95 lumens per watt, and a R9 color rendering value of at least 50.

17. The lighting device of claim 13, wherein said aggregate emissions comprise a CRI Ra value of at least 90.

18. The lighting device of claim 13, wherein said aggregate emissions of the lighting device comprise a luminous efficacy of at least 80 lumens per watt.

19. The lighting device of claim 13, wherein said aggregate emissions of the lighting device comprise a luminous efficacy of at least 95 lumens per watt.

20. The lighting device of claim 13, wherein said aggregate emissions comprise a correlated color temperature (CCT) value in a range of from 2000K to 5000K.

21. The lighting device of claim 13, comprising at least one of the following features:

said first emissions comprise a dominant wavelength not exceeding 465 nm, or said second emissions comprise a peak wavelength of less than 628 nm.

22. The lighting device of claim 13, wherein:

said at least one lumiphoric material comprises a first lumiphoric material including at least one of lutetium aluminum garnet (LuAG) or green aluminate (GAL) material; and

said at least one lumiphoric material comprises a second lumiphoric material including cerium(III)-doped yttrium aluminum garnet (Ce;

YAG) or yttrium aluminum oxide doped with cerium yttrium aluminum garnet (NYAG) material;

wherein a proportion of the first lumiphoric material to the second lumiphoric material is at least 1;

1.

23. The lighting device of claim 13, wherein the lighting device is devoid of any electrically activated solid state emitter arranged to generate emissions (i) having a dominant wavelength in a range of from 430 nm to 480 nm and (ii) exiting the lighting device without passage through a layer or region comprising a lumiphoric material.

24. The lighting device of claim 13, wherein the lighting device is being devoid of any incandescent light emitting element and is devoid of any notch filtering element.