Patent ID: 7851988

Claim:
A green-emitting LED which is designed as a luminescence conversion LED, comprising: a primary radiation source, which is a chip emitting a primary radiation in the UV or blue radiation region; and a layer of a phosphor which is arranged in front of the primary radiation source and completely or partially converts the primary radiation of the chip into a green emission of dominant wavelength λ dom =550 to 570 nm; wherein the phosphor belongs to a class of oxynitridosilicates, having a cation M and an empirical formula M (1-c) Si 2 O 2 N 2 :D c , where D denotes a doping with divalent europium and where M comprises Sr as a constituent and M=Sr alone or M=Sr (1-x-y) Ba y Ca x with 0≦x+y<0.5 is used, the oxynitridosilicates completely or predominantly comprising a high-temperature-stable modification HT, and the phosphor comprises less than 100 ppm tungsten impurity and less than 100 ppm cobalt impurity.