Solid state lighting devices having remote luminescent material-containing element, and lighting methods

• US 8,337,030 B2
• Filed: 05/13/2009
• Issued: 12/25/2012
• Est. Priority Date: 05/13/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul Kenneth
• Primary Examiner(s): Dzierzynski, Evan
• Assistant Examiner(s): ALLEN, DANIELLE NICOLE
• Application Number:
  US12/465,203
• Publication Number:
  US 20100290208A1
• Time in Patent Office: 1,322 Days
• Field of Search: 362/84, 362/800, 362/227, 362/230, 362/231, 362/236, 362/240
• US Class Current: 362/84
• CPC Class Codes: B60Q 1/0052 concentric
• CPC Class Codes: B60Q 1/0058 Stacked, i.e. one lamp located behind the other in the optical axis direction
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 7/26 the material comprising photoluminescent substances
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2103/20 of polygonal shape, e.g. square or rectangular
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting device comprising a first group of solid state light emitters, an element containing luminescent material and a second group of solid state light emitters spaced from the element. In some embodiments, (1) at least 50% of light emitted by one of the first group does not mix with light emitted by the second group before the light emitted by the second group has entered the element, (2) at least 90% of exiting light emitted by the second group travels farther within the lighting device than 90% of exiting light emitted by the first group, (3) an average distance traveled by exiting light emitted by the second group is farther than an average distance traveled by exiting light emitted by the second group, and/or (4) light emitted by the first group directly exiting the lighting device exits the lighting device without being incident upon the element.

Claims

1. A lighting device comprising:

a first group of solid state light emitters comprising at least a first solid state light emitter;

a second group of solid state light emitters comprising at least a second solid state light emitter; and

at least a first luminescent material-containing element comprising at least one luminescent material,

the second group of solid state light emitters spaced from every luminescent material-containing element in the lighting device,

wherein at least 50% of the light emitted by the first solid state light emitter does not mix with any light emitted by any of the second group of solid state light emitters until after the light emitted by the second solid state light emitters has entered the luminescent material-containing element.

2. A lighting device as recited in claim 1, wherein at least 75% of the light emitted by the second solid state light emitter enters the luminescent material-containing element before reaching an emission plane of the first solid state light emitter.

3. A lighting device as recited in claim 2, wherein

at least a portion of the luminescent material-containing element is substantially transparent, and

at least 75% of the light emitted by the second group of solid state light emitters passes through the luminescent material-containing element and through the emission plane of the first solid state light emitter.

4. A lighting device as recited in claim 2, wherein the luminescent material-containing element is substantially parallel to the emission plane of the first solid state light emitter.

5. A lighting device as recited in claim 2, wherein the emission plane of the first solid state light emitter extends through at least a portion of the luminescent material-containing element.

6. A lighting device as recited in claim 2, wherein the first group of solid state light emitters comprises a plurality of solid state light emitters which each have respective emission planes that are substantially parallel to the emission plane of the first solid state light emitter.

7. A lighting device as recited in claim 1, wherein light emitted by the second solid state light emitter is surrounded by light emitted by the first group of solid state light emitters.

8. A lighting device as recited in claim 1, wherein light emitted by the first solid state light emitter is surrounded by light emitted by the second group of solid state light emitters.

9. A lighting device as recited in claim 1, wherein the first solid state light emitter is mounted on a first support element that defines a first support element opening in which the luminescent material-containing element is positioned.

10. A lighting device as recited in claim 9, wherein substantially all of the light exiting the lighting device that was emitted by the second group of solid state light emitters passes through the luminescent material-containing element and through the first support element opening.

11. A lighting device as recited in claim 10, wherein substantially all of the light exiting the lighting device that was emitted by the second group of solid state light emitters passes simultaneously through the luminescent material-containing element and through the first support element opening.

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

the first solid state light emitter is mounted on a first support element, and

the luminescent material-containing element defines a luminescent material-containing element opening in which the first support element is positioned.

13. A lighting device as recited in claim 1, wherein the first solid state light emitter is mounted on the luminescent material-containing element.

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

substantially all light exiting the lighting device that was emitted by the second group of solid state light emitters enters the luminescent material-containing element, and

at least 50% of light exiting the lighting device that was emitted by the first group of solid state light emitters does not enter the luminescent material-containing element.

15. A lighting device as recited in claim 1, wherein at least a portion of the luminescent material-containing element is between the first group of solid state light emitters and the second group of solid state light emitters.

16. A lighting device as recited in claim 1, wherein at least a portion of the luminescent material-containing element is substantially transparent.

17. A lighting device as recited in claim 1, wherein at least a portion of the luminescent material-containing element is reflective.

18. A lighting device as recited in claim 1, wherein the luminescent material-containing element is adjacent to a first support element on which the first solid state light emitter is mounted.

19. A lighting device comprising:

a first group of solid state light emitters comprising at least a first solid state light emitter;

a second group of solid state light emitters comprising at least a second solid state light emitter; and

at least a first luminescent material-containing element comprising at least one luminescent material,

the second group of solid state light emitters spaced from every luminescent material-containing element in the lighting device,

wherein at least 90% of light exiting the lighting device that was emitted by the second group of solid state light emitters travels at least 25% farther within the lighting device than 90% of light exiting the lighting device that was emitted by the first group of solid state light emitters.

20. A lighting device as recited in claim 19, wherein:

the lighting device further comprises a housing and a diffuser which together define a space, and

at least 90% of light exiting the lighting device that was emitted by the second group of solid state light emitters travels within the space at least 25% farther than 90% of light exiting the lighting device that was emitted by the first group of solid state light emitters.

21. A lighting device comprising:

a first group of solid state light emitters comprising at least a first solid state light emitter;

a second group of solid state light emitters comprising at least a second solid state light emitter; and

at least a first luminescent material-containing element comprising at least one luminescent material,

the second group of solid state light emitters spaced from every luminescent material-containing element in the lighting device, and

wherein an average distance traveled by light exiting the lighting device that was emitted by the second group of solid state light emitters is at least 25% farther than an average distance traveled by light exiting the lighting device that was emitted by the first group of solid state light emitters.

22. A solid state lighting device, comprising:

a first group of solid state light emitters;

a luminescent material-containing element comprising at least one luminescent material; and

a second group of solid state light emitters spaced from the luminescent material-containing element,

wherein the lighting device is configured such that light emitted by the first group of solid state light emitters that directly exits the lighting device exits the lighting device without being incident upon the luminescent material-containing element.

23. The solid state lighting device of claim 22, wherein the lighting device is further configured such that light from the first group of solid state light emitters and light from the luminescent material is mixed.

24. The solid state lighting device of claim 22, wherein a combination of light exiting the solid state lighting device that was emitted by the luminescent material and light exiting the solid state lighting device that was emitted by the second group of solid state light emitters would, in an absence of any additional light, produce a sub-mixture of light having x, y color coordinates which define a point which is within a first area on a 1931 CIE Chromaticity Diagram 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 0.32, 0.40, the second point having x, y coordinates of 0.36, 0.48, the third point having x, y coordinates of 0.43, 0.45, the fourth point having x, y coordinates of 0.42, 0.42, and the fifth point having x, y coordinates of 0.36, 0.38;

and

wherein light from the first group of solid state light emitters is red and/or orange.

25. The solid state lighting device of claim 22, wherein the first group of solid state light emitters comprise light emitters that emit one or more of red, green, blue and/or cyan light.

26. The solid state lighting device of claim 25, wherein the luminescent material and the second group of solid state light emitters emit light that, when combined, is perceived as white light.

27. The solid state lighting device of claim 22, wherein the first group of light emitters is mounted on a substrate that is substantially coplanar with a plane of the luminescent material-containing element.

28. The solid state lighting device of claim 27, wherein the substrate surrounds the luminescent material-containing element.

29. The solid state lighting device of claim 27, wherein the substrate is surrounded by the luminescent material-containing element.

30. The solid state lighting device of claim 27, wherein the luminescent material-containing element comprises the substrate.

31. The solid state lighting device of claim 22, the lighting device comprising a secondary reflector configured to collect the light from the luminescent material-containing element and reflect the light to an exit aperture of the solid state lighting device.

32. The solid state lighting device of claim 31, wherein the first group of solid state light emitters is between the luminescent material-containing element and the exit aperture of the lighting device.

33. The solid state lighting device of claim 31, wherein the luminescent material-containing element is between the first group of solid state light emitters and the exit aperture of the solid state lighting device.