Patent ID: 9580649
Date: 2017-02-28
CPC Classifications: C09K,H01L

Claim:
1. Process for increasing the radiation-induced emission efficiency and/or for shifting the emission wavelength of a europium-doped alkaline-earth metal siliconitride or of a europium-doped alkaline-earth metal silicooxynitride, comprising the steps: (a) preparation of a mixture of a europium-doped alkaline-earth metal siliconitride or a europium-doped alkaline-earth metal silicooxynitride and an alkaline-earth metal nitride, where the alkaline-earth metal of the europium-doped alkaline-earth metal siliconitride or of the europium-doped alkaline-earth metal silicooxynitride and of the alkaline-earth metal nitride may be identical or different; and (b) calcination of the mixture under non-oxidising conditions.