由高温固相反应首次合成Li2(Gd1-xEux)4(MoO4)7(0＜x≤1.0)红色荧光体并研究其晶体结构及发光性质.经检测,发现材料结构属于四方晶系白钨矿.Eu3+的激发光谱主要是由Eu3+的较高4f能级跃迁激发谱及次要的Mo6+和Eu3+的电荷转移带CTB组成.其中最强的激发(吸收)谱线分别为465 nm(7F0→5D2)及395nm(7F0→5L6).其发射色纯度很高的红光,发射峰为614nm和611nm.讨论在许多Eu3+激活的钼/钨酸盐荧光体中产生高浓度猝灭的原因.碱金属离子(如Li+,Na+等)和位于阳离子格位上的空位Φ在Eu3+浓度猝灭过程中扮演重要角色.对Eu3+ - Eu3+之间的无辐射能量传递过程起阻塞作用,而且使Eu3+-Eu3+离子间的距离增加.在Li2(Gd1-xEux)4(MoO4)7(0＜x≤1.0)中,Eu3+激活剂浓度x可高达0.5mol以上,Li2(Gd1-xEux)4(MoO4)7(0＜x≤1.0)也是一种高效的红色荧光体.这类Eu3+激活的钼酸盐可望用作白光LED的红色荧光体.
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