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Oxynitride materials have been widely studied as fluorescent hosts for their special electronic band structure.Recently,many reports of transition metal(e.g.Mn2+)and rare earth(e.g.Eu2+)ions doped γ–alon are sharing new attention in application of photoluminescence.Especially,the functional ions doped transparent ceramic aroused much interest for the relatively high thermal conductivity and long-term reliability as well as high optical transparency,which make it a candidate for white-emitting diodes application.