Solid state lighting device including narrow spectrum emitter

• US 9,515,056 B2
• Filed: 06/06/2014
• Issued: 12/06/2016
• Est. Priority Date: 06/06/2014
• 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., Keller, Bernd P.
• Primary Examiner(s): Hines, Anne
• Assistant Examiner(s): DIAZ, JOSE
• Application Number:
  US14/298,327
• Publication Number:
  US 20150357372A1
• Time in Patent Office: 914 Days
• Field of Search: 313498-512, 362/2, 362/510, 362/293
• US Class Current: 1/1
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21Y 2113/10 of different colours
• 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 25/0753 the devices being arranged next to each other
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A multi-emitter solid state lighting device includes at least one narrow spectral output solid state light emitter, such as may be in the green range, having a full width-half maximum emission value of no greater than 30 nm. First, second, and third electrically solid state emitters may include dominant wavelengths in the ranges of 485-505 nm (or 491-505 nm), 526-545 nm, and 615-625 nm. Aggregate emissions of a solid state lighting device may comprise a scotopic/photopic (S/P) ratio value that exceeds threshold values for conventional white light-emitting devices including at least one phosphor-converted LED by at least 10%, 20%, 30%, or 40%, in combination with reasonably high gamut and brightness, over a range of desired CCT values.

Claims

1. A lighting device comprising a plurality of electrically activated solid state light emitters including:

at least one first electrically activated solid state light emitter comprising a dominant wavelength in a range of from 485 nm to 505 nm;

at least one second electrically activated solid state light emitter comprising a dominant wavelength in a range of from 526 nm to 545 nm; and

at least one third electrically activated solid state light emitter comprising a dominant wavelength in a range of from 615 nm to 625 nm;

wherein the at least one second electrically activated solid state light emitter comprises a narrow spectral output with a full width—

half maximum emission value of no greater than 30 nm; and

wherein the lighting device comprises one or more of the following features (i) to (vi);

(i) the plurality of electrically activated solid state light emitters is arranged to generate aggregate emissions having a correlated color temperature, and having a scotopic/photopic ratio in at least one of the following ranges (a) to (d);

(a) a value of at least 0.000042 times the correlated color temperature, plus 0.53;

(b) a value of at least 0.000045 times the correlated color temperature, plus 0.57;

(c) a value of at least 0.000048 times the correlated color temperature, plus 0.62;

or

(d) a value of at least 0.000069 times the correlated color temperature, plus 0.14;

(ii) the lighting device is devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of from 546 nm to 614 nm;

(iii) the lighting device is devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of greater than 625 nm;

(iv) aggregate emissions of the lighting device comprise a gamut area index (GAI) value in a range of from 80 to 100;

(v) the at least one first electrically activated solid state light emitter comprises multiple first electrically activated solid state light emitters;

the at least one second electrically activated solid state light emitter comprises multiple second electrically activated solid state light emitters;

the at least one third electrically activated solid state light emitter comprises multiple third electrically activated solid state light emitters; and

the lighting device comprises a plurality of clusters of electrically activated solid state light emitters, wherein each cluster of the plurality of clusters includes a first electrically activated solid state light emitter of the multiple first electrically activated solid state light emitters, a second electrically activated solid state light emitter of the multiple second electrically activated solid state light emitters, and a third electrically activated solid state light emitter of the multiple third electrically activated solid state light emitters;

or

(vi) aggregate emissions of the lighting device comprise a color rendering index (CRI Ra) value in a range not exceeding 50.

2. The lighting device according to claim 1, wherein the at least one first electrically activated solid state light emitter comprises a dominant wavelength in a range of from 491 nm to 505 nm.

3. The lighting device according to claim 1, wherein the plurality of electrically activated solid state light emitters is arranged to generate aggregate emissions having a correlated color temperature, and having a scotopic/photopic ratio in at least one of the following ranges (a) to (d):

(a) a value of at least 0.000042 times the correlated color temperature, plus 0.53;

(b) a value of at least 0.000045 times the correlated color temperature, plus 0.57;

(c) a value of at least 0.000048 times the correlated color temperature, plus 0.62;

or

(d) a value of at least 0.000069 times the correlated color temperature, plus 0.14.

4. The lighting device according to claim 1, wherein any of (i) the at least one first electrically activated solid state light emitter or (ii) the at least one third electrically activated solid state light emitter comprises a narrow spectral output with a full width-half maximum emission value of no greater than 30 nm.

5. The lighting device according to claim 1, wherein each of (i) the at least one first electrically activated solid state light emitter and (ii) the at least one third electrically activated solid state light emitter comprises a narrow spectral output with a full width-half maximum emission value of no greater than 30 nm.

6. The lighting device according to claim 1, being devoid of any lumiphoric material.

7. The lighting device according to claim 1, being devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range below 485 nm.

8. The lighting device according to claim 1, being devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of from 546 nm to 614 nm.

9. The lighting device according to claim 1, being devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of greater than 625 nm.

10. The lighting device according to claim 1, wherein aggregate emissions of the lighting device comprise a gamut area index (GAI) value in a range of from 80 to 100.

11. The lighting device according to claim 1, wherein:

the at least one first electrically activated solid state light emitter comprises multiple first electrically activated solid state light emitters;

the at least one second electrically activated solid state light emitter comprises multiple second electrically activated solid state light emitters; and

the at least one third electrically activated solid state light emitter comprises multiple third electrically activated solid state light emitters.

12. The lighting device according to claim 11, comprising a plurality of clusters of electrically activated solid state light emitters, wherein each cluster of the plurality of clusters includes a first electrically activated solid state light emitter of the multiple first electrically activated solid state light emitters, a second electrically activated solid state light emitter of the multiple second electrically activated solid state light emitters, and a third electrically activated solid state light emitter of the multiple third electrically activated solid state light emitters.

13. The lighting device according to claim 1, comprising at least one of the following features (a) to (e):

(a) a single leadframe arranged to conduct electrical power to the plurality of electrically activated solid state light emitters;

(b) a single reflector arranged to reflect at least a portion of light emanating from the plurality of electrically activated solid state light emitters;

(c) a single submount or mounting element supporting the plurality of electrically activated solid state light emitters;

(d) a single lens arranged to transmit at least a portion of light emanating from the plurality of electrically activated solid state light emitters;

or

(e) a single diffuser arranged to diffuse at least a portion of light emanating from the plurality of electrically activated solid state light emitters.

14. The lighting device according to claim 1, wherein aggregate emissions of the lighting device comprise a color rendering index (CRI Ra) value in a range not exceeding 50.

15. The lighting device according to claim 1, wherein aggregate emissions of the lighting device comprise a correlated color temperature (CCT) value in a range of from 2700K to 5000K.

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

30. The lighting device of claim 1, wherein the lighting device comprises at least two of the features (i) to (vi).

31. The lighting device of claim 1, wherein the lighting device comprises at least three of the features (i) to (vi).

17. A lighting device comprising a plurality of electrically activated solid state light emitters including:

at least one first electrically activated solid state light emitter comprising a first dominant wavelength;

at least one second electrically activated solid state light emitter comprising a second dominant wavelength; and

at least one third electrically activated solid state light emitter comprising a third dominant wavelength;

wherein at least one of the at least one first, the at least one second, or the at least one third electrically activated solid state light emitter comprises a narrow spectral output with a full width-half maximum emission value of no greater than 30 nm;

wherein aggregate emissions of the lighting device comprise a gamut area index (GAI) value in a range of from 80 to 100; and

wherein aggregate emissions of the lighting device comprise a correlated color temperature, and comprise a scotopic/photopic ratio in at least one of the following ranges;

(a) a value of at least 0.000042 times the correlated color temperature, plus 0.53;

(b) a value of at least 0.000045 times the correlated color temperature, plus 0.57;

(c) a value of at least 0.000048 times the correlated color temperature, plus 0.62;

or

(d) a value of at least 0.000069 times the correlated color temperature, plus 0.14.

18. The lighting device according to claim 17, wherein the second dominant wavelength exceeds the first dominant wavelength by at least 20 nm, and wherein the third dominant wavelength exceeds the second dominant wavelength by at least 60 nm.

19. The lighting device according to claim 17, further comprising at least one of the following features (i) to (iii):

(i) the at least one first electrically activated solid state light emitter comprises a dominant wavelength in a range of from 485 nm to 505 nm;

(ii) the at least one second electrically activated solid state light emitter comprises a dominant wavelength in a range of from 526 nm to 545 nm;

or

(iii) the at least one third electrically activated solid state light emitter comprises a dominant wavelength in a range of from 615 nm to 625 nm.

20. The lighting device according to claim 19, further comprising each of features (i) to (iii).

21. The lighting device according to claim 20, wherein the at least one second electrically activated solid state light emitter comprises a narrow spectral output with a full width-half maximum emission value of no greater than 30 nm.

22. The lighting device according to claim 17, being devoid of any lumiphoric material.

23. The lighting device according to claim 17, further comprising at least one of the following features (a) to (c):

(a) the lighting device is devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of below 485 nm;

(b) the lighting device is devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of from 546 nm to 614 nm;

or

(c) the lighting device is devoid of any electrically activated solid state light emitter comprising a dominant wavelength in a range of greater than 625 nm.

24. The lighting device according to claim 17, wherein:

the at least one first electrically activated solid state light emitter comprises multiple first electrically activated solid state light emitters;

the at least one second electrically activated solid state light emitter comprises multiple second electrically activated solid state light emitters; and

the at least one third electrically activated solid state light emitter comprises multiple third electrically activated solid state light emitters.

25. The lighting device according to claim 24, comprising a plurality of clusters of electrically activated solid state light emitters, wherein each cluster of the plurality of clusters includes a first electrically activated solid state light emitter of the multiple first electrically activated solid state light emitters, a second electrically activated solid state light emitter of the multiple second electrically activated solid state light emitters, and a third electrically activated solid state light emitter of the multiple third electrically activated solid state light emitters.

26. The lighting device according to claim 17, comprising at least one of the following features (a) to (e):

(a) single leadframe arranged to conduct electrical power to the plurality of electrically activated solid state light emitters;

(b) a single reflector arranged to reflect at least a portion of light emanating from the plurality of electrically activated solid state light emitters;

(c) a single submount or mounting element supporting the plurality of electrically activated solid state light emitters;

(d) a single lens arranged to transmit at least a portion of light emanating from the plurality of electrically activated solid state light emitters;

or

(e) a single diffuser arranged to diffuse at least a portion of light emanating from the plurality of electrically activated solid state light emitters.

27. The lighting device according to claim 17, wherein aggregate emissions of the lighting device comprise a color rendering index (CRI Ra) value in a range not exceeding 50.

28. The lighting device according to claim 17, wherein aggregate emissions of the lighting device comprise a correlated color temperature (CCT) value in a range of from 2700K to 5000K.

29. A light bulb or light fixture comprising the lighting device of claim 17.