采用高温固相法合成了白光发光二极管用LiSrPO4:Eu3+红色荧光粉.测量了LiSrPO4:Eu3+的激发和发射光谱,结果显示材料的发射光谱为一系列尖峰,主峰位于616 nm,具有很强的红光发射;激发光谱中O2-→Eu3+的电荷迁移态CTS (220～310 nm)非常低,Eu3+的f→f (310～500 nm)跃迁吸收很强,主峰位于393 nm,与InGaN(350～410 nm)管芯匹配.比较了LiSrPO4:Eu3+与LiCaPO4:Eu3+、LiBaPO4:Eu3+发射光谱的差异,这三种晶体中Eu3+占据的格位对称性按Ca、Sr、Ba顺序逐渐增加.根据Dexter理论判定Eu3+在LiSrPO4中的浓度猝灭机理为电四极-电四极(q-q)相互作用.加入电荷补偿剂Li+、Na+和Cl 均提高了LiSrPO4:Eu3+材料的发射强度.LiSrPO4: Eu3+是一种适合白光发光二极管激发的红色荧光粉.
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