Lighting device having luminescent material between a reflective cup and a solid state light emitter

• US 8,994,045 B2
• Filed: 10/11/2007
• Issued: 03/31/2015
• Est. Priority Date: 10/12/2006
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H.
• Primary Examiner(s): Montalvo, Eva Y
• Assistant Examiner(s): Vieira, Diana C
• Application Number:
  US11/870,679
• Publication Number:
  US 20080089053A1
• Time in Patent Office: 2,728 Days
• Field of Search: 257/82, 257/81, 257/E33.055, 257/E33.056, 257/E33.059, 257/E33.06, 257/E33.061, 257/79, 257/80, 257/E33.058, 257/E33.053, 257/E33.59, 257 98-100, 362/84, 438/27, 438/29, 313/498, 313/499, 313501-504
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/45147 Copper (Cu) as principal constituent
• 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 2224/48257 connecting the wire to a die 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 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• 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: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material

Abstract

A lighting device comprising a light emitter chip, a reflective cup and a lumiphor positioned between the chip and the cup. Also, a lighting device comprising a light emitter chip, a wire bonded to a first surface of the chip and a lumiphor which faces a second surface of the chip. Also, a lighting device comprising a light emitter chip, and a lumiphor, a first surface of the chip facing a first region of the lumiphor, a second surface of the chip facing a second region of the lumiphor. Also, a lighting device comprising a light emitter chip and first and second lumiphors, a first surface of the chip facing the second lumiphor, a second surface of the chip facing the first lumiphor. Also, methods of making lighting devices.

Claims

1. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup;

at least first and second lumiphors;

at least a first transparent structure,

a first surface of the first lumiphor and a first surface of the first solid state light emitter coplanar,

a first portion of the first lumiphor in a plane that is perpendicular to the axis of the first reflective cup and that includes a portion of the first solid state light emitter that is farthest from the first reflective cup,

at least a second portion of the first lumiphor between the first solid state light emitter and the first reflective cup such that the first solid state light emitter is not in direct contact with the first reflective cup, and

light emitted by the first solid state light emitter that exits the lighting device passes through the second lumiphor.

2. A lighting device as recited in claim 1, wherein the first transparent structure, the first lumiphor and the first solid state light emitter in combination fill the first reflective cup.

3. A lighting device as recited in claim 1, wherein the first transparent structure covers the first solid state light emitter, so that any light exiting the first reflective cup must pass through the first transparent structure.

4. A lighting device as recited in claim 1, wherein the first solid state light emitter comprises a light emitting diode.

5. A lighting device as recited in claim 1, wherein the first lumiphor comprises a binder material and at least one luminescent material dispersed in the binder material.

6. A lighting device as recited in claim 1, wherein the first reflective cup comprises a cup bottom surface and a cup sidewall, and the first lumiphor completely covers the cup bottom surface.

7. A lighting device as recited in claim 1, wherein the first transparent structure at least partially covers the first solid state light emitter.

8. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup;

at least first and second lumiphors;

at least a first transparent structure,

a first surface of the first lumiphor and a first surface of the solid state light emitter coplanar,

a first portion of the first lumiphor in a plane that is perpendicular to the axis of the first reflective cup and that includes a portion of the first solid state light emitter that is farthest from the first reflective cup, and

at least a second portion of the first lumiphor between the first solid state light emitter and the first reflective cup such that the first solid state light emitter is not in direct contact with the first reflective cup,

the second lumiphor at least partially covering the first transparent structure.

9. A lighting device as recited in claim 8, wherein the second lumiphor completely covers the first transparent structure.

10. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup;

at least first and second lumiphors; and

at least a first transparent region,

the first reflective cup comprising a bottom wall and at least one sidewall,

a surface of the first lumiphor in contact with a surface of the first solid state light emitter that faces the bottom wall of the first reflective cup,

at least a first portion of the first lumiphor between the first solid state light emitter and the bottom wall of the first reflective cup and in a plane that is perpendicular to an axis of the first reflective cup and that includes a portion of the first solid state light emitter that is closest to the first reflective cup, at least a second portion of the first lumiphor in a plane that is perpendicular to the axis of the first reflective cup and that includes a portion of the first solid state light emitter that is farthest from the first reflective cup, and

at least a portion of the second lumiphor in contact with the first reflective cup.

11. A lighting device as recited in claim 10, wherein the first transparent region, the first lumiphor and the first solid state light emitter in combination fill the first reflective cup.

12. A lighting device as recited in claim 10, wherein the first transparent region covers the first solid state light emitter, so that any light exiting the first reflective cup must pass through the first transparent region.

13. A lighting device as recited in claim 10, wherein the first solid state light emitter comprises a light emitting diode.

14. A lighting device as recited in claim 10, wherein the first lumiphor comprises a binder material and at least one luminescent material dispersed in the binder material.

15. A lighting device as recited in claim 10, wherein the first reflective cup comprises a cup bottom surface and a cup sidewall, and the first lumiphor completely covers the cup bottom surface.

16. A lighting device as recited in claim 10, wherein the second lumiphor at least partially covers the first transparent region.

17. A lighting device as recited in claim 10, wherein the second lumiphor completely covers the first transparent region.

18. A lighting device as recited in claim 10, wherein the first transparent region at least partially covers the first solid state light emitter.

19. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup, the first reflective cup comprising a bottom and at least one side wall, the at least one side wall comprising at least one edge that is farthest from the bottom;

at least first and second lumiphors,

at least one electrical conductor; and

at least a first transparent region,

a region, defined by (a) the bottom, (b) the at least one side wall and (c) a plane defined by the at least one edge, is substantially completely filled by the at least a first solid state light emitter, the first lumiphor and the at least a first transparent region, the at least a first transparent region devoid of any air pockets, the region substantially devoid of any elements other than the at least a first solid state light emitter, the first lumiphor, the at least one electrical conductor and the at least a first transparent region,

at least a portion of the first lumiphor between the first solid state light emitter and the bottom of the first reflective cup, and

light emitted by the first solid state light emitter that exits the i kiting device passes through the second lumiphor.

20. A lighting device as recited in claim 19, wherein the first transparent region, the first lumiphor and the first solid state light emitter in combination fill the first reflective cup.

21. A lighting device as recited in claim 19, wherein the first transparent region covers the first solid state light emitter, so that any light exiting the first reflective cup must pass through the first transparent region.

22. A lighting device as recited in claim 19, wherein the first reflective cup comprises a cup bottom surface and a cup sidewall, and the first lumiphor completely covers the cup bottom surface.

23. A lighting device as recited in claim 19, wherein the first transparent region at least partially covers the first solid state light emitter.

24. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup, the first reflective cup comprising a bottom and at least one side wall, the at least one side wall comprising at least one edge that is farthest from the bottom;

at least first and second lumiphors,

at least one electrical conductor; and

at least a first transparent region,

a region, defined by (a) the bottom, (b) the at least one side wall and (c) a plane defined by the at least one edge, is substantially completely filled by the at least a first solid state light emitter, the first lumiphor and the at least a first transparent region, the region substantially devoid of any elements other than the at least a first solid state light emitter, the first lumiphor, the at least one electrical conductor and the at least a first transparent region,

at least a portion of the first lumiphor between the first solid state light emitter, and the bottom of the first reflective cup, the second lumiphor at least partially covering the first transparent region.

25. A lighting device comprising:

at least a first solid state light emitter;

at least a first reflective cup, the first reflective cup comprising a bottom and at least one side wall, the at least one side wall comprising at least one edge that is farthest from the bottom;

at least first and second lumiphors; and

at least a first transparent region, the at least a first transparent region non-gaseous,

a region, defined by (a) the bottom, (b) the at least one side wall and (c) a plane defined by the at least one edge, is substantially completely filled by the at least a first solid state light emitter, the first lumiphor and the at least a first transparent region, the region substantially devoid of any elements other than the at least a first solid state light emitter, the first lumiphor and the at least a first transparent region,

at least a portion of the first lumiphor between the first solid state light emitter and the bottom of the first reflective cup, and

light emitted by the first solid state light emitter that exits the lighting device passes through the second lumiphor.