LED COLOR CHANNELS INCLUDING PHOSPHOR-BASED LEDS FOR HIGH LUMINOUS EFFICACY LIGHT SOURCE

• US 20130221873A1
• Filed: 02/19/2013
• Published: 08/29/2013
• Est. Priority Date: 02/17/2012
• Status: Abandoned Application

• Current Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Original Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Inventors: Weaver, Matthew D.
• Application Number:
  US13/770,595
• Publication Number:
  US 20130221873A1
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A light source apparatus is disclosed. The light source includes an array of light emitting diodes (LEDs) including at least three color channels, the at least three color channels includes: a yellow-greenish channel including a YAG:Ce phosphor emitter pumped by a royal blue InGaN LED; a red channel including a second LED, the second LED being either phosphor-based LED or AlInGaP LED; and a blue green channel including a third LED wherein the third LED is a royal blue InGaN LED. The light source further includes a mixing barrel around the array of LEDs for mixing light generated from the three color channels to simulate a black body radiator at different correlated color temperatures. Each of the at least three color channels includes one or more LEDs emitting the same color.

Claims

1. A method of manufacture of a light source comprising:

configuring an array of light emitting diodes (LEDs) including at least three color channels each emitting the same color by;

selecting a yellow-greenish channel including a YAG;

Ce phosphor emitter pumped by a first LED;

selecting a red channel including a second LED;

selecting a blue green channel including a phosphor emitter pumped by a third LED;

providing a mixing barrel for mixing light generated from the three color channels to simulate a black body radiator at different correlated color temperatures; and

attaching the array of LEDs within the mixing barrel.

2. The method of claim 1, further comprising disposing a hemispherical cap over at least a portion of the YAG:

Ce phosphor emitter.

3. The method of claim 1, further comprising disposing a hemispherical cap over at least a portion of the phosphor emitter of the blue green channel.

4. The method of claim 1, wherein selecting the yellow greenish channel includes selecting the yellow greenish channel emitting light within a color zone defined by a tetragon in the International Commission on Illumination (CIE) chromaticity diagram having coordinates of:

(0.360638,0.480911), (0.399681,0.464340), (0.419245,0.494098), and (0.379575,0.521592).

5. The method of claim 1, wherein selecting the blue green channel includes selecting the blue green channel emitting light within a color zone defined by a tetragon in. the International Commission on Illumination (CIE) chromaticity diagram having coordinates of:

(0.127462, 0.183467), (0.108023,0.279327), (0.094522,0.274454), and (0.113662,0.181167).

6. A method of operating of a color tunable light source with light emitting diodes (LEDs) comprising:

color tuning the color tunable light source to a warm color with a low correlated color temperature (CCT) level by driving a red channel and a yellow greenish channel full on, the red channel and the yellow greenish channel each with one or more LEDs emitting the same color;

color tuning the color tunable light source to a cool color with a high CCT level by driving a blue green channel full on, the blue green channel with one or more LEDs emitting the same color; and

color tuning the color tunable light source to a mid CCT level between the high CCT level and the low CCT level by driving the blue green channel, the red channel, and the yellow greenish channel full on.

7. The method of claim 6, wherein the high CCT level is 6500K.

8. The method of claim 6, wherein the low CCT level is 2500K.

9. The method of claim 6, wherein the mid CCT level is 4100K.

10. The method of claim 6, further comprising color tuning from the low CCT level to the mid CCT level by driving the blue channel from low to full on.

11. The method of claim 6, further comprising color tuning from the mid CCT level to the high CCT level by driving the red channel and the yellow greenish from full on to low while maintaining a constant ratio of the red channel to the yellow greenish channel.

12. A light source apparatus comprising:

an array of light emitting diodes (LEDs) including at least three color channels, the at least three color channels includes;

a yellow-greenish channel including a YAG;

Ce phosphor emitter pumped by a first LED, wherein the first LED is a royal blue InGaN LED;

a red channel including a second LED; and

a blue green channel including a third LED wherein the third LED is a royal blue InGaN LED; and

a mixing barrel around the array of LEDs for mixing light generated from the three color channels to simulate a black body radiator at different correlated color temperatures;

wherein each of the at least three color channels includes one or more LEDs emitting the same color.

13. The light source apparatus of claim 12, wherein the blue green channel includes a phosphor emitter pumped by the third LED, the phosphor emitter being a Ba:

Si Oxynitride Eu-doped phosphor.

14. The light source apparatus of claim 12, wherein the second LED is an AlInGaP red LED.

15. The light source apparatus of claim 12, wherein the second LED is a InGaN royal blue LED pumping a red luminous phosphor with 90% to 95% of total lumens from the second LED and the red luminous phosphor derived from the red luminous phosphor.

16. The light source apparatus of claim 12, wherein the second LED is a InGaN royal blue LED pumping a red nitride phosphor.

17. The light source apparatus of claim 12, wherein the YAG:

Ce phosphor is a Yittrium Aluminum Garnet, Cerium 3+ doped, Y₃Al₅O₁₂.

18. The light source apparatus of claim 12, wherein the phosphor emitter of the blue green channel has the emission spectra peak of 490 nm wavelength.

19. The light source apparatus of claim 12, wherein the blue green channel includes a phosphor emitter pumped by the third LED, the phosphor emitter having peak emission at 490 nm wavelength.

20. The light source apparatus of claim 12, wherein the blue green channel further including a fixed ratio blue InGaN LED in peak emission wavelength range of 460 nm to 490 nm.

21. The light source apparatus of claim 12, wherein the blue green channel includes two sub-channels including a blue InGaN channel and a InGaN royal blue channel doped with Ba:

Si₂O₂N₂;

Eu2+.

22. The light source apparatus of claim 12, wherein the blue green channel includes a long wavelength InGaN blue LED in peak emission range of 490 nm wavelength.