High CRI solid state lighting devices with enhanced vividness

• US 9,593,812 B2
• Filed: 04/23/2014
• Issued: 03/14/2017
• Est. Priority Date: 04/23/2014
• 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): Bowman, Mary Ellen
• Application Number:
  US14/259,993
• Publication Number:
  US 20150308633A1
• Time in Patent Office: 1,056 Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• 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: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 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 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/3577 Emulating the dimming characteristics, brightness or colour temperature of incandescent lamps

Abstract

Solid state lighting devices including multiple solid state light emitters are arranged to produce a mixture of light having a color rendering index (CRI Ra) value of at least 80, having a gamut area index (GAI) value in a range of from 80 to 100, and x, y coordinates within a predefined region of a 1931 CIE Chromaticity diagram, e.g. including x, y coordinates defining point on or within a first polygon bounded by the following x, y coordinates: (0.38, 0.34), (0.38, 0.36), (0.40, 0.38), (0.42, 0.38), (0.44, 0.36), (0.46, 0.36), and (0.46, 0.34). In certain embodiments, a lighting device includes a primary emitter having a dominant wavelength in a range of from 430 to 480 nm, a lumiphor having a dominant wavelength in a range of from 535 to 585 nm, and a supplemental emitter having a dominant wavelength in a range of from 590 to 650 nm.

Claims

1. A lighting device comprising:

at least one primary solid state light emitter arranged to emit primary solid state light emitter emissions comprising a dominant wavelength in a range of from 430 nm to 480 nm;

at least one lumiphor arranged to receive and be excited by at least a portion of emissions of the at least one primary solid state light emitter, and emit lumiphor emissions comprising a dominant wavelength in a range of from about 535 nm to about 585 nm; and

at least one supplemental solid state light emitter arranged to generate supplemental solid state light emitter emissions comprising a dominant wavelength in a range of from 590 nm to 650 nm;

wherein;

a combination of (A) light exiting the lighting device that was emitted by the at least one primary solid state light emitter, (B) light exiting the lighting device that was emitted by the at least one lumiphor, and (C) light exiting the lighting device that was emitted by the at least one supplemental solid state light emitter 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 polygon bounded by the following x, y coordinates;

(0.38, 0.34), (0.38, 0.36), (0.40, 0.38), (0.42, 0.38), (0.44, 0.36), (0.46, 0.36), and (0.46, 0.34);

the mixture of light has a color rendering index (CRI Ra) value of at least 80; and

the mixture of light has a gamut area index (GAI) value in a range of from 80 to 100.

2. The lighting device of claim 1, wherein the supplemental solid state light emitter emissions comprise a dominant wavelength in a range of from 600 nm to 630 nm.

3. The lighting device of claim 1, wherein the primary solid state light emitter emissions comprise a dominant wavelength in a range of from 440 nm to 460 nm.

4. The lighting device of claim 1, further comprising a first power line, wherein each of the at least one primary solid state light emitter and the at least one supplemental solid state light emitter is electrically connected to the first power line.

5. The lighting device of claim 1, wherein:

a combination of (A) light exiting the lighting device that was emitted by the at least one primary solid state light emitter, (B) light exiting the lighting device that was emitted by the at least one lumiphor, and (C) light exiting the lighting device that was emitted by the at least one supplemental solid state light emitter 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 polygon bounded by the following x, y coordinates;

(0.38, 0.34), (0.38, 0.36), (0.40, 0.38), and (0.40, 0.36); and

the mixture of light has a color rendering index (CRI Ra) value of at least 90.

6. The lighting device of claim 1, wherein the mixture of light has a luminous efficacy of at least 60 lumens per watt.

7. The lighting device of claim 1, wherein the mixture of light has a R9 color rendering value of least 85.

8. The lighting device of claim 1, being devoid of any electrically activated solid state light emitter arranged to generate emissions (i) having 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.

9. The lighting device of claim 1, further comprising a notch filtering material arranged in a light path between (i) the at least one primary solid state light emitter, the at least one lumiphor, and the at least one supplemental solid state light emitter, and (ii) at least one light output surface of the lighting device, wherein the notch filtering material is arranged to receive at least a portion of the lumiphor emissions and filter the received lumiphor emissions to exhibit a spectral notch.

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

a single leadframe arranged to conduct electrical power to the at least one primary solid state light emitter and the at least one supplemental solid state light emitter;

a single reflector arranged to reflect at least a portion of light emanating from each of the at least one primary solid state light emitter and the at least one supplemental solid state light emitter;

a single submount or mounting element supporting the at least one primary solid state light emitter and the at least one supplemental solid state light emitter;

a single lens arranged to transmit at least a portion of light emanating from each of the at least one primary solid state light emitter and the at least one supplemental solid state light emitter; and

a single diffuser arranged to diffuse at least a portion of light emanating from each of the at least one primary solid state light emitter and the at least one supplemental solid state light emitter.

11. The lighting device of claim 1, wherein the at least one primary solid state light emitter comprises a plurality of primary solid state light emitters, and the at least one supplemental solid state light emitter comprises a plurality of supplemental solid state light emitters.

12. The lighting device of claim 11, comprising a plurality of clusters of solid state light emitters, wherein each cluster of the plurality of clusters includes at least one emitter of the plurality of primary solid state light emitters and at least one emitter of the plurality of supplemental solid state light emitters.

13. The lighting device of claim 1, wherein the at least one lumiphor is arranged in a coating disposed on or over the at least one primary solid state light emitter.

14. The lighting device of claim 1, wherein the at least one lumiphor is spatially segregated from the at least one primary solid state light emitter.

15. The lighting device of claim 1, wherein the at least one lumiphor is dispersed in a carrier material.

16. The lighting device of claim 15, wherein the carrier material comprises an encapsulant material arranged in contact with at least one surface of the at least one primary solid state light emitter.

17. The lighting device of claim 15, further comprising a reflector cup or a boundary wall defining a cavity, wherein the at least one primary solid state light emitter is arranged within the cavity, and at least a portion of the encapsulant material is within the cavity.

18. The lighting device of claim 1, being devoid of any incandescent light emitting element.

19. The lighting device of claim 1, being devoid of any notch filtering material arranged to receive emissions of any of the at least one primary solid state light emitter, the at least one lumiphor, and the at least one supplemental solid state light emitter.

20. A light bulb or light fixture comprising the lighting device of claim 1.

21. A lighting device comprising multiple electrically activated solid state light emitters, wherein:

a combination of light exiting the lighting device that was emitted by the multiple electrically activated solid state light emitters 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 polygon bounded by the following x, y coordinates;

(0.38, 0.34), (0.38, 0.36), (0.40, 0.38), (0.42, 0.38), (0.44, 0.36), (0.46, 0.36), and (0.46, 0.34);

the mixture of light has a color rendering index (CRI Ra) value of at least 80; and

the mixture of light has a gamut area index (GAI) value in a range of from 80 to 100.

22. The lighting device of claim 21, further comprising a first power line, wherein each electrically activated solid state light emitter of the multiple electrically activated solid state light emitters is electrically connected to the first power line.

23. The lighting device of claim 21, wherein the multiple electrically activated solid state light emitters includes at least one LED comprising a dominant wavelength in a range of from 440 nm to 460 nm, at least one LED comprising a dominant wavelength in a range of from 535 nm to 560 nm, and at least one LED comprising a dominant wavelength in a range of from 590 nm to 620 nm.

24. A lighting device of claim 21, wherein:

a combination of light exiting the lighting device that was emitted by the multiple electrically activated solid state light emitters 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 polygon bounded by the following x, y coordinates;

(0.38, 0.34), (0.38, 0.36), (0.40, 0.38), and (0.40, 0.36); and

the mixture of light has a color rendering index (CRI Ra) value of at least 90.

25. A lighting device of claim 21, wherein at least one electrically activated solid state emitter of the multiple electrically activated solid state light emitters comprises at least one light emitting diode (LED) chip and a lumiphoric material arranged to receive at least a portion of emissions of the at least one LED chip and responsively emit lumiphor emissions.

26. The lighting device of claim 25, wherein the lumiphoric material is spatially segregated from the multiple electrically activated solid state light emitters.

27. The lighting device of claim 21, wherein the mixture of light has a luminous efficacy of at least 60 lumens per watt.

28. The lighting device of claim 21, wherein the mixture of light has a R9 color rendering value of least 85.

29. The lighting device of claim 21, being devoid of any electrically activated solid state light emitter arranged to generate emissions (i) having 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.

30. The lighting device of claim 21, further comprising a notch filtering material arranged in a light path between (i) at least one electrically activated solid state emitter of the multiple electrically activated solid state emitters and (ii) at least one light output surface of the lighting device, wherein the notch filtering material is arranged to receive at least a portion emissions of the at least one electrically activated solid state emitter and filter the received emissions to exhibit a spectral notch.

31. The lighting device of claim 21, being devoid of any incandescent light emitting element.

32. The lighting device of claim 21, being devoid of any notch filtering material arranged to receive emissions of any one or more solid state light emitters of the multiple electrically activated solid state light emitters.

33. A light bulb or light fixture comprising the lighting device of claim 21.