White-emitting LED having a defined color temperature

Details White-emitting LED having a defined color temperature White-emitting LED having a defined color temperature

2011-06-21

2011-06-21

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S498000, C313S512000, C252S30140R, C252S30160R

Reexamination Certificate

active

07965031

ABSTRACT:
LED with a low color temperature up to 3500 K, comprising a blue-emitting LED with two phosphors in front of it, a first phosphor from the class of the oxynitridosilicates, having a cation M, which is doped with divalent Europium, and has the empirical formula M(1-c)Si2O2N2:Dc, with M=Sr, or M=Sr(1-x-y)BayCaxwith x+y<0.5 being used, the oxynitridosilicate completely or predominantly comprising the high-temperature-stable modification HT, and a second phosphor from the class of the nitridosilicates of formula (Ca,Sr)2Si5N8:Eu.

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