Patent ID: 8159126

Claim:
A light emitting device comprising: a light source to emit primary light; and a light conversion layer to convert at least a part of the primary light into secondary light comprising a CaAlSiN light converting material with a transmissivity of ≧10% to ≦80% for a light in the wavelength range from ≧580 to ≦1000 nm, wherein the CaAlSiN light converting material is selected out of a material comprising (Ca 1−x−y−z Sr x Ba y Mg z ) 1−n Al 1−a+b B a Si 1-b N 3−b O b :M n with 0<x,y,z≦1, 0<a≦1, 0<b<1, 0.002≦n≦0.2, M being a metal comprising at least one of Gd and Lu.