Multi-chip light emitting device lamps for providing high-CRI warm white light and light fixtures including the same

• US 8,410,680 B2
• Filed: 11/05/2010
• Issued: 04/02/2013
• Est. Priority Date: 01/10/2005
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Medendorp, Nicholas W. Jr., McClear, Mark Terrence, Keller, Bernd P., Brandes, George R., LeToquin, Ronan P.
• Primary Examiner(s): Guharay, Karabi
• Application Number:
  US12/941,030
• Publication Number:
  US 20110050125A1
• Time in Patent Office: 879 Days
• Field of Search: 313501-503, 313/498, 362/800
• US Class Current: 313/501
• CPC Class Codes: C09K 11/586 with alkaline earth metals
• CPC Class Codes: C09K 11/623 with zinc or cadmium
• CPC Class Codes: C09K 11/7421 with alkaline earth metals
• CPC Class Codes: C09K 11/7702 with zinc or cadmium
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• 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 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• 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
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

A multi-chip lighting emitting device (LED) lamp for providing white light includes a submount including first and second die mounting regions thereon. A first LED chip is mounted on the first die mounting region, and a second LED chip is mounted on the second die mounting region. The LED lamp is configured to emit light having a spectral distribution including at least four different color peaks to provide the white light. For example, a first conversion material may at least partially cover the first LED chip, and may be configured to absorb at least some of the light of the first color and re-emit light of a third color. In addition, a second conversion material may at least partially cover the first and/or second LED chips, and may be configured to absorb at least some of the light of the first and/or second colors and re-emit light of a fourth color. Related light fixtures and methods are also disclosed.

Claims

1. A solid state lamp comprising:

a first solid state emitter having peak emissions within a blue wavelength range;

a second solid state emitter having peak emissions within a cyan wavelength range;

a first wavelength conversion material at least partially covering the first solid state emitter and arranged to emit light within a yellow wavelength range; and

a second wavelength conversion material at least partially covering the second solid state emitter and arranged to emit light within a red wavelength range.

2. The solid state lamp of claim 1, comprising a third solid state emitter having peak emissions within the red wavelength range.

3. The solid state lamp of claim 1, comprising another solid state emitter having peak emissions within the blue wavelength range.

4. The solid state lamp of claim 1, comprising another solid state emitter having peak emissions within the cyan wavelength range.

5. The solid state lamp of claim 1, further comprising a third wavelength conversion material at least partially converting any of the first solid state emitter and the second solid state emitter.

6. The solid state lamp of claim 1, wherein each of the first solid state emitter and the second solid state emitter is mounted to a single mounting element.

7. The solid state lamp of claim 1, having light output of at least about 60 lumens per watt with a color rendering index of at least 90.

8. The solid state lamp of claim 1, wherein at least one of the first wavelength conversion material and the second wavelength conversion material at least partially covers all of the solid state emitters.

9. The solid state lamp of claim 1, characterized by at least one of the following features (a) and (b):

(a) the first wavelength conversion material only partially covers the first solid state emitter; and

(b) the second wavelength conversion material only partially covers the second solid state emitter.

10. The solid state lamp of claim 1, wherein the first wavelength conversion material and the second wavelength conversion material are segregated into discrete phosphor-containing regions.

11. The solid state lamp of claim 1, wherein each solid state lamp comprises a LED.

12. The solid state lamp of claim 1, wherein any of the first wavelength conversion material and the second wavelength material comprises a semiconductor phosphor.

13. The solid state lamp of claim 1, comprising a control circuit configured to independently supply drive current to the first solid state emitter and the second solid state emitter.

14. A light fixture comprising at least one solid state lamp according to claim 1.

15. A solid state lamp comprising:

a plurality of solid state emitters including a first solid state emitter having peak emissions within a blue wavelength range, a second solid state emitter having peak emissions within a cyan wavelength range, and a third solid state emitter having peak emissions within a green wavelength range; and

a first wavelength conversion material at least partially covering each emitter of the plurality of solid state emitters and arranged to emit light within a yellow wavelength range.

16. The solid state lamp of claim 15, wherein the first wavelength conversion material only partially covers at least one emitter of the plurality of solid state emitters.

17. The solid state lamp of claim 15, further comprising a second wavelength conversion material at least partially covering any solid state emitter of the plurality of solid state emitters and arranged to emit light within a red wavelength range.

18. The solid state lamp of claim 17, wherein the second wavelength conversion material only partially covers at least one solid state emitter of the plurality of solid state emitters.

19. The solid state lamp of claim 15, comprising a control circuit configured to independently supply current to each solid state emitter of the plurality of solid state emitters.

20. A light fixture comprising at least one solid state lamp according to claim 15.