Reduced phosphor lighting devices

• US 9,897,276 B2
• Filed: 08/26/2011
• Issued: 02/20/2018
• Est. Priority Date: 08/26/2011
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony P., Hussell, Christopher, Letoquin, Ronan P., Yuan, Zongjie, Tong, Tao, Guschl, Peter
• Primary Examiner(s): Hines, Anne
• Application Number:
  US13/218,980
• Publication Number:
  US 20130050979A1
• Time in Patent Office: 2,370 Days
• Field of Search: 362 84
• 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 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 3/0615 the material diffusing light, e.g. translucent glass
• CPC Class Codes: F21V 3/0625 the material diffusing light, e.g. translucent plastics
• CPC Class Codes: F21V 3/08 the material comprising photoluminescent substances
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• 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 lighting device comprising a solid-state light source, and a diffuser configured for color mixing of the light from the solid-state light source and spatially separated therefrom, the diffuser comprising at least one phosphor material. Methods of fabricating a lighting device having a reduced total amount of phosphor comprising combining an amount of phosphor with a diffuser structure.

Claims

1. A light device comprising:

a LED light source;

a diffuser configured for color mixing of the light from the LED light source and spatially separated therefrom;

the diffuser comprising;

a phosphor material having a binder and at least one phosphor present in an amount of 30 weight percent to 57.5 weight percent; and

a reflective material wherein the reflective material is present in an amount of about 5 weight percent of the phosphor present in the phosphor material to about 60 weight percent of the phosphor present in the phosphor material.

2. The lighting device of claim 1, wherein both the phosphor and reflective material are present within the diffuser.

3. The lighting device of claim 1, wherein the phosphor and reflective material are deposited on the diffuser.

4. The lighting device of claim 1, wherein the phosphor is deposited on the reflective material.

5. The lighting device of claim 1, wherein diffuser at least partially surrounds the at least one solid-state light source.

6. The lighting device of claim 1, wherein the diffuser is transparent or translucent.

7. The lighting device of claim 1, wherein the diffuser is a glass or ceramic.

8. The lighting device of claim 1, wherein the diffuser is a polymer.

9. The lighting device of claim 1, wherein the polymer comprises at least one of polysilicone, polyacrylate, polyarylate, polycarbonate, and blends thereof.

10. The lighting device of claim 1, wherein the reflective material is at least one of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, boron nitride, talc, silica, alumina, zeolite, calcium carbonate, magnesium carbonate, barium sulfate, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, mica, montmorillonite clay, carbon particles, glass particles, carbon nanotubes, and mixtures thereof.

11. The lighting device of claim 1, wherein the reflective material is titanium dioxide.

12. The lighting device of claim 1, wherein the reflective material is alumina.

13. The lighting device of claim 1, the diffuser having an outer surface and an inner surface, the inner surface in closer proximity to the LED light source;

wherein the reflective material is on outer surface and the phosphor is on the inner surface.

14. The lighting device of claim 1, the diffuser having an outer surface and an inner surface, the inner surface in closer proximity to the LED light source;

wherein the phosphor is on outer surface and the reflective material is on the inner surface.

15. The lighting device of claim 1, further comprising a globe at least partially surrounding the diffuser.

16. The lighting device of claim 1, wherein the phosphor is between 5 and 50 μ

m thick.

17. The lighting device of claim 1, wherein the phosphor is between 1 and 25 μ

m thick.

18. The lighting device of claim 1, wherein the outside surface of the diffuser is etched or sand blasted.

19. The lighting device of claim 1, wherein the solid-state light source comprises at least one LED with a GaN emitting layer.

20. The lighting device of claim 1, wherein the LED light source and the phosphor are configured for providing at least one of blue-shifted yellow (BSY), blue-shifted green (BSG), blue-shifted red (BSR), green-shifted red (GSR), and cyan-shifted red (CSR) light.

21. The lighting device of claim 1, wherein the solid-state light source comprises at least a second LED that emits one of UV, blue, royal blue and cyan light.

22. The lighting device of claim 1, wherein the solid-state light source comprises at least one of UV, blue, green, orange, and red LED devices.

23. The lighting device of claim 1, wherein the phosphor includes at least one of red, red/orange, yellow, green and cyan emitting phosphor.

24. The lighting device of claim 1, wherein the phosphor includes at least two different color emitting phosphors.

25. A method of fabricating a lighting device having a reduced total amount of phosphor, the method comprising the step of

providing a diffuser structure comprising:

an amount of phosphor present in a binder;

an amount of reflective material relative to the amount of phosphor;

the diffuser structure configured for color mixing of the light from a LED light source and for spatially separating the amount of phosphor from the LED light source,

wherein the phosphor is present at about 30 weight percent to 57.5 weight percent in the binder and the reflective material is present in an amount of about 5 weight percent to about 60 weight percent of the amount of phosphor present in the binder.

26. The method of claim 25, wherein the phosphor is present within the diffuser.

27. The method of claim 25, wherein the phosphor is deposited on the diffuser.

28. The method of claim 25, wherein the diffuser structure comprises polysilicone, polyacrylate, polyarylate, polycarbonate, cyclic olefinic copolymer, glass, ceramic, or precursor material thereof.

29. The method of claim 25, wherein the diffuser structure at least partially surrounds the LED light source.

30. The method of claim 25, wherein the amount of phosphor reduced is red phosphor.

31. The method of claim 25, wherein the reflective material is at least one of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, boron nitride, talc, silica, alumina, zeolite, calcium carbonate, magnesium carbonate, barium sulfate, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, mica, montmorillonite clay, carbon particles, glass particles, carbon nanotubes, and mixtures thereof.

32. The method of claim 25, wherein the diffuser comprises an outer surface and an inner surface with the reflective material deposited on the outer surface of the diffuser.

33. The method of claim 25, wherein the lighting device further comprising one or more filters to reduce or eliminate IR- and UV-light release from the lighting device.