Patent ID: 8808577

Claim:
A thermally stable phosphor made of the M-Si—O—N system, having a cation M and an activator D, M being represented by Ba or Sr alone or as a mixture and optionally also being combined with at least one other element from the group Ca, Mg, Zn, Cu, the phosphor being activated with Eu or Tb alone or as a mixture, optionally in codoping with Mn or Yb, the activator D partially replacing the cation M, and the phosphor emits green, wherein the phosphor is produced from the charge stoichiometry MO—SiO 2 —SiN 4/3 with an increased oxygen content relative to the known phosphor MSi 2 O 2 N 2 :D, where MO is an oxidic compound, and the phosphor has the stoichiometry M a Si b+3c O a+2b N 4c , in which the ratio of b:c is from 4.8 to 9.0, wherein a is from 1 to 3.