Patent ID: 7965031

Claim:
A white-emitting LED with a defined color temperature, designed as a luminescence conversion LED, comprising: a primary radiation source, which is a chip that emits in the blue spectral region; a layer of first and second phosphors in front of said source, both of which phosphors partially convert the radiation of the chip; wherein the first phosphor is from the class of the oxynitridosilicates having a cation M and the empirical formula M (1-c )Si 2 O 2 N 2 :D c , where M comprises Sr as the main constituent and D is doped with divalent Europium, M=Sr or M=Sr (1-x-y) Ba y Ca x with 0≦x+y<0.5 being used, the oxynitridosilicate completely or predominantly comprising a high-temperature-stable modification HT, the oxynitridosilicate comprising less than 100 ppm tungsten impurity and less than 100 ppm cobalt impurity; and wherein the second phosphor is a nitridosilicate of formula (Ca,Sr) 2 Si 5 N 8 :Eu, producing a color temperature of from 2300 to 7000 K and at the same time achieving a color rendering of Ra>90.