SHIFTING SPECTRAL CONTENT IN SOLID STATE LIGHT EMITTERS BY SPATIALLY SEPARATING LUMIPHOR FILMS

• US 20070170447A1
• Filed: 01/19/2007
• Published: 07/26/2007
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: LED Lighting Fixtures, Inc. (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony Paul, NEGLEY, Gerald H.
• Granted Patent: US 8,264,138 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• 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
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

A lighting device, comprising at least one solid state light emitter, at least one first lumiphor and at least one second lumiphor which is spaced from the first lumiphor. The solid state light emitter can be a light emitting diode. A method of making a lighting device, comprising positioning at least one second lumiphor spaced from and outside of at least one first lumiphor relative to at least one solid state light emitter. A method of lighting, comprising providing electricity to at least one solid state light emitter in such a lighting device.

Claims

1. A lighting device, comprising:

at least one solid state light emitter;

at least one first lumiphor; and

at least one second lumiphor, said second lumiphor being spaced from said first lumiphor.

2. A lighting device as recited in claim 1, wherein said lighting device comprises a plurality of solid state light emitters.

3. A lighting device as recited in claim 1, wherein said lighting device comprises a plurality of said first lumiphors.

4. A lighting device as recited in claim 1, wherein said lighting device comprises a plurality of said second lumiphors.

5. A lighting device as recited in claim 1, further comprising a first reflective element, said solid state light emitter and said first lumiphor being positioned within said first reflective element.

6. A lighting device as recited in claim 1, further comprising at least one packaging element, said packaging element completely surrounding said at least one solid state light emitter and said at least one first lumiphor.

7. A lighting device as recited in claim 6, wherein said packaging element is substantially transparent.

8. A lighting device as recited in claim 1, wherein said at least one region of air is positioned between said first lumiphor and said second lumiphor.

9. A lighting device as recited in claim 1, further comprising a second reflective element.

10. A lighting device as recited in claim 1, wherein a surface area of said second lumiphor is at least twice a surface area of said first lumiphor.

11. A lighting device as recited in claim 1, wherein a mixture of:

(1) light emitted by said at least one solid state light emitter which exits from said at least one first lumiphor without being converted, and

(2) light emitted by said at least one solid state light emitter which exits from said at least one first lumiphor after being converted by said at least one first lumiphor,

has x, y color coordinates which are within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth 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, and said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.45, 0.35, said second point having x, y coordinates of 0.35, 0.45, said third point having x, y coordinates of 0.12, 0.22, and said fourth point having x, y coordinates of 0.20, 0.075.

12. A lighting device as recited in claim 1, wherein said solid state light emitter emits light having a wavelength within the ultraviolet range or within the visible range up to a wavelength of 525 mm.

13. A lighting device as recited in claim 1, wherein said second lumiphor comprises at least one luminescent material.

14. A lighting device as recited in claim 13, wherein said second lumiphor further comprises at least one binder.

15. A lighting device as recited in claim 14, wherein said binder is substantially transparent.

16. A lighting device as recited in claim 14, wherein said binder is selected from among the group consisting of epoxies, silicones and glasses.

17. A lighting device as recited in claim 14, wherein said second lumiphor further comprises at least one additive selected from among the group consisting of diffusers, scatterers and tints.

18. A method of making a lighting device, comprising:

positioning at least one second lumiphor outside of at least one first lumiphor relative to at least one solid state light emitter, said second lumiphor being spaced from said first lumiphor.

19. A method of lighting, comprising:

providing electricity to at least one solid state light emitter, said solid state light emitter being positioned within at least one first lumiphor, said at least one first lumiphor being spaced from at least one second lumiphor, said first lumiphor being positioned at least partially between said solid state light emitter and said second lumiphor.

20. A method of lighting, comprising:

providing electricity to at least one solid state light emitter, whereby said solid state light emitter emits light which passes from said solid state light emitter, through said first lumiphor, and then through said second lumiphor, said first lumiphor being spaced from said second lumiphor.