LIGHTING DEVICE AND LIGHTING METHOD

• US 20080130265A1
• Filed: 11/29/2007
• Published: 06/05/2008
• Est. Priority Date: 11/30/2006
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: LED Lighting Fixtures, Inc. (Wolfspeed, Inc.)
• Inventors: VAN DE VEN, Antony Paul, NEGLEY, Gerald H., PICKARD, Paul Kenneth
• Granted Patent: US 7,901,111 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• 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 2924/00014 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 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• 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
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A lighting device, comprising a solid state light emitter and a light filter. At least a portion of light emitted by the light emitter contacts the filter, and at least part of the light passes through the filter. Also, such lighting devices further comprising lumiphor, in which at least some of the first part of the light is absorbed by the lumiphor, which then emits light, and at least a portion of any light emitted by the lumiphor directed toward the filter is reflected by the filter. Also, a method of lighting, comprising illuminating a solid state light emitter in such devices. Also, a lighting device, comprising a solid state light emitter; a lumiphor and filter means for allowing at least a portion of light emitted by the light emitter to pass through and for reflecting a second portion of light emitted by the lumiphor after the lumiphor is excited.

Claims

1. A lighting device, comprising:

at least a first solid state light emitter; and

at least a first light filter,

said first solid state light emitter and said first light filter being positioned relative to one another such that if said first solid state light emitter is illuminated, said first solid state light emitter will emit first solid state emitter light, and at least a portion of said first solid state emitter light will contact said first light filter,

said first light filter allowing passage of at least some light having wavelength within a first solid state emitter range of wavelength and reflecting at least some light having wavelength outside said first solid state emitter range of wavelength, said first solid state emitter range of wavelength consisting of wavelengths of light emitted by said first solid state light emitter if said first solid state light emitter is illuminated, such that if said first solid state light emitter is illuminated so that said first solid state light emitter emits said first solid state emitter light, at least a portion of said first solid state emitter light will pass through said first light filter.

2. A lighting device as recited in claim 1, wherein said first solid state light emitter is an LED chip.

3. A lighting device as recited in claim 2, wherein said first light filter is mounted on said LED chip.

4. A lighting device as recited in claim 1, wherein if said first solid state light emitter is illuminated, said first solid state light emitter will emit first solid state emitter light, and at least 90 percent of said first solid state emitter light will pass through said first light filter.

5. A lighting device as recited in claim 1, wherein if said first solid state light emitter is illuminated, said first solid state light emitter will emit light comprising light having a peak wavelength in the range of from 380 nm to 490 nm.

6. A lighting device as recited in claim 1, wherein said first light filter is mounted on said first solid state light emitter.

7. A lighting device as recited in claim 1, wherein said first light filter is in direct contact with said first solid state light emitter.

8. A lighting device as recited in claim 1, wherein said lighting device further comprises at least a first lumiphor, said first lumiphor being positioned relative to said first solid state light emitter and said first light filter such that if said first solid state light emitter is illuminated such that said first solid state light emitter emits said first solid state emitter light:

at least a first portion of said first solid state emitter light passes through said first light filter and is absorbed by said first lumiphor, thereby exciting said first lumiphor such that said first lumiphor emits first lumiphor light, and at least a portion of said first lumiphor light is reflected by said first light filter.

9. A lighting device as recited in claim 8, wherein if said first solid state light emitter is illuminated, at least 90 percent of said first solid state emitter light will pass through said first light filter, and at least 50 percent of said first lumiphor light that contacts said first light filter will be reflected by said first light filter.

10. A lighting device as recited in claim 8, wherein:

if said first solid state light emitter is illuminated, said first solid state light emitter will emit first solid state emitter light comprising light having a peak wavelength in the range of from 380 nm to 490 nm;

at least a portion of said first solid state emitter light will pass through said first light filter and be absorbed by said first lumiphor, thereby exciting said first lumiphor and causing said first lumiphor to emit first lumiphor light comprising light having a dominant wavelength in the range of from 555 nm to 585 nm; and

at least a portion of said first lumiphor light will be reflected by said first light filter.

11. A lighting device as recited in claim 8, wherein said first solid state light emitter, said first lumiphor and said first light filter are all contained in a first package, said first package further comprising at least one encapsulant.

12. A lighting device as recited in claim 8, wherein said first lumiphor is spaced from said first solid state light emitter.

13. A lighting device as recited in claim 1, wherein if said first solid state light emitter is illuminated, said lighting device will emit illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth 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, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38.

14. A lighting device as recited in claim 1, wherein said first solid state light emitter and said first light filter are both contained in a first package, said first package further comprising at least one encapsulant.

15. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one power line, and if electricity is supplied to said at least one power line, a mixture of all of the light exiting the lighting device would have x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within seven MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

16. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one power line, and if electricity is supplied to said at least one power line, a mixture of all of the light exiting the lighting device would have u′

, v′

coordinates within 0.01 of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

17. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one power line, and if electricity is supplied to said at least one power line, a mixture of all of the light exiting the lighting device would have a correlated color temperature of between 2,500 K and 10,000 K.

18. An enclosure, comprising an enclosed space and at least one lighting device as recited in claim 1, wherein if said first solid state light emitter is illuminated, said lighting device would illuminate at least a portion of said enclosed space.

19. A structure comprising a surface and at least one lighting device as recited in claim 1, wherein if said first solid state light emitter is illuminated, said lighting device would illuminate at least a portion of said surface.

20. An illuminated area, comprising at least one item selected from among the group consisting of a structure, a swimming pool or spa, a room, a warehouse, an indicator, a road, a parking lot, a vehicle, signage, road signs, a billboard, a ship, a toy, a mirror, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, an LCD display, a cave, a tunnel, a yard and a lamppost, having mounted therein or thereon at least one lighting device as recited in claim 1.

21. A method of lighting, comprising:

illuminating at least a first solid state light emitter to produce first solid state light emitter light, said first solid state light emitter being positioned relative to a first light filter such that at least a first portion of said first solid state emitter light passes through said first light filter,

said first solid state light emitter and said first light filter being positioned relative to a first lumiphor such that at least some of said first portion of said first solid state emitter light is absorbed by said first lumiphor, thereby exciting said first lumiphor and causing said first lumiphor to emit first lumiphor light, and at least a portion of said first lumiphor light is reflected by said first light filter.

22. A method as recited in claim 21, wherein at least 90 percent of said first solid state emitter light passes through said first light filter.

23. A method as recited in claim 21, wherein said first solid state emitter light has a peak wavelength in the range of from 380 nm to 490 nm.

24. A method as recited in claim 21, wherein at least 90 percent of said first solid state emitter light passes through said first light filter, and at least 50 percent of said first lumiphor light that contacts said first light filter is reflected by said first light filter.

25. A lighting device, comprising:

at least a first solid state light emitter;

at least a first lumiphor; and

filter means for allowing at least a first portion of light emitted by said first solid state light emitter to pass through and for reflecting at least a second portion of light which is emitted by said first lumiphor after said first lumiphor is excited by at least part of said first portion of light.

26. A lighting device as recited in claim 25, wherein said first solid state light emitter is an LED chip.

27. A lighting device as recited in claim 26, wherein said filter means is mounted on said LED chip.

28. A lighting device as recited in claim 25, wherein if said first solid state light emitter is illuminated, said first solid state light emitter will emit first solid state emitter light, and at least 90 percent of said first solid state emitter light will pass through said filter means.

29. A lighting device as recited in claim 25, wherein if said first solid state light emitter is illuminated, said first solid state light emitter will emit light comprising light having a peak wavelength in the range of from 380 nm to 490 mm.

30. A lighting device as recited in claim 25, wherein if said first solid state light emitter is illuminated, at least 90 percent of said first solid state emitter light will pass through said filter means, and at least 50 percent of said second portion of light that contacts said filter means will be reflected by said filter means.

31. A lighting device as recited in claim 25, wherein:

if said first solid state light emitter is illuminated, said first solid state light emitter will emit first solid state emitter light comprising light having a peak wavelength in the range of from 380 nm to 490 mm;

at least a portion of said first solid state emitter light will pass through said filter means and be absorbed by said first lumiphor, thereby exciting said first lumiphor and causing said first lumiphor to emit first lumiphor light comprising light having a dominant wavelength in the range of from 555 nm to 585 nm; and

at least a portion of said first lumiphor light will be reflected by said filter means.

32. A lighting device as recited in claim 25, wherein said first solid state light emitter, said first lumiphor and said filter means are all contained in a first package, said first package further comprising at least one encapsulant.

33. A lighting device as recited in claim 25, wherein said first lumiphor is spaced from said first solid state light emitter.

34. A lighting device as recited in claim 25, wherein if said first solid state light emitter is illuminated, said lighting device will emit illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth 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, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38.