High-efficiency led-based illumination system with improved...

Details High-efficiency led-based illumination system with improved... High-efficiency led-based illumination system with improved...

2004-09-24

2010-11-02

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S483000, C313S512000, C313S485000, C313S486000, C313S500000, C313S503000, C313S504000, C313S505000, C313S506000, C257S098000

Reexamination Certificate

active

07825574

ABSTRACT:
The illumination system makes simultaneous use of the color-mixing principle from blue, green and red (RGB mixing) and the principle of converting of a primary radiation emitted by an LED into light with a longer wavelength by a phosphor which absorbs this radiation, with at least two LEDs being used, of which a first LED emits primarily in the range from 340 to 470 nm (dominant wavelength) and a second LED emits in the red region at 600 to 700 nm (dominant wavelength), wherein the green component is produced by the primary radiation of the first LED being at least partially converted by a green-emitting phosphor, the green-emitting phosphor used being a phosphor from the class of the oxynitridosilicates, having a cation M and the empirical formula M(1−c)Si2O2N2:Dc, M comprising Sr as a constituent and D being doped with divalent europium, where M=Sr or M=Sr(1−x−y)BayCaxwith x+y<0.5 is used, the oxynitridosilicate completely or predominantly comprising the high-temperature-stable modification HT.

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