LED/phosphor-LED hybrid lighting systems

• US 20030067773A1
• Filed: 11/22/2002
• Published: 04/10/2003
• Est. Priority Date: 12/02/1999
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Pashley, Michael D., Herman, Stephen, Marshall, Thomas M.
• Granted Patent: US 6,692,136 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• 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 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A hybrid lighting system for producing white light including at least one light emitting diode and phosphor-light emitting diode. The hybrid lighting system exhibits improved performance over conventional LED lighting systems that use LEDs or phosphor-LEDs to produce white light. In particular, the hybrid system of the invention permits different lighting system performance parameters to be addressed and optimized as deemed important, by varying the color and number of the LEDs and/or the phosphor of the phosphor LED.

Claims

1. A lighting system for producing white light, the system comprising:

at least one light emitting diode; and

a phosphor-light emitting diode disposed adjacent to the at least one light emitting diode.

2. The lighting system according to claim 1, wherein the phosphor-light emitting diode emits at least two different colors of light.

3. The lighting system according to claim 1, further comprising at least a second light emitting diode.

4. The lighting system according to claim 3 wherein the phosphor-light emitting diode emits at least two different colors of light, one of the at least two colors being at least substantially identical to the color emitted by at least one of the light emitting diodes.

5. The lighting system according to claim 3, wherein the light emitted from the light emitting diodes are of the same general color but have different spectral wavelengths.

6. The lighting system according to claim 1, further comprising second and third light emitting diodes.

7. The lighting system according to claim 6, wherein the light emitted from two of the three light emitting diodes are of the same general color but have different spectral wavelengths.

8. The lighting system according to claim 7, wherein the phosphor-light emitting diode emits at least three different colors of light.

9. The lighting system according to claim 6, wherein the pure-phosphor light emitting diode chip emits at least three different colors of light.

10. The lighting system according to claim 6, wherein the phosphor-light emitting diode emits at least two different colors of light.

11. The lighting system according to claim 1, wherein the at least one light emitting diode emits red light.

12. The lighting system according to claim 11, wherein the phosphor-light emitting diode includes a blue light emitting diode that emits blue light and at least one phosphor that converts at least a portion of the blue light to one of a green light and a red light.

13. The lighting system according to claim 12, further comprising at least a second light emitting diode which emits green light.

14. The lighting system according to claim 13, further comprising a third light emitting diode which emits red light.

15. The lighting system according to claim 14, wherein the spectral wavelength of the red light emitted from the first light emitting diode is different from the spectral wavelength of the red light emitted from the third light emitting diode.

16. The lighting system according to claim 14, wherein the phosphor-light emitting diode emits light of at least a third different color, the color being selected from the group consisting of amber and yellow-green.

17. The lighting system according to claim 15, wherein the phosphor-light emitting diode emits light of at least a third different color, the color being selected from the group consisting of amber and yellow-green.

18. The lighting system according to claim 11, wherein the phosphor-light emitting diode emits light of at least a third different color, the color being selected from the group consisting of amber and yellow-green.

19. The lighting system according to claim 12, wherein the phosphor-light emitting diode emits light of at least a third different color, the color being selected from the group consisting of amber and yellow-green.

20. The lighting system according to claim 11, further comprising at least a second light emitting diode which emits green light.