【摘 要】
：
We successfully control luminescence of phosphors such as M2Si5N8:Eu(M = Ca,Sr,Ba)and Ca12Al14O32F2:Eu with lattice strain effects.we show that size-mismatc
【机 构】
：
Department of Chemistry,National Taiwan Univeristy,Taipei 106,Taiwan
【出 处】
：
The 5th International Congress on Ceramics, ICC5(第五届国际陶瓷大会)
论文部分内容阅读
We successfully control luminescence of phosphors such as M2Si5N8:Eu(M = Ca,Sr,Ba)and Ca12Al14O32F2:Eu with lattice strain effects.we show that size-mismatch between host and dopant cations tunes photoluminescence shifts systematically in M1.95Eu0.05Si5 ? xAlxN8 ? xOx lattices,leading to a red shift when the M = Ba and Sr host cations are larger than the Eu2+ dopant,but a blue shift when the M = Ca host is smaller.A local anion clustering mechanism in which Eu2+ gains excess nitride coordination in the M = Ba and Sr structures,but excess oxide in the Ca analogues,is proposed for these mismatch effects.
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