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铋激活碱土金属氟磷酸盐的制备及其发光性质

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Abstract:

用高温固相法在空气中制备了Bi掺杂碱土金属氟磷酸盐[(M5(PO4)3F,M=Ca,Sr,Ba)]荧光粉,通过X射线衍射和荧光光谱对其晶体结构和紫外–可见发光性质进行了分析。结果表明观察所有样品都得到Bi3+位于紫外波段的特征发光,观察Ca5(PO4)3FBi和Sr5(PO4)3FBi样品可同时到源于Bi2+明亮的黄白色宽带发射。根据光谱结果和结构特性,分析Bi在氟磷酸盐中的多价态特性及形成机理,结果显示在氟磷酸盐中存在2种Bi3+发光中心,分别占据2种不同的阳离子(M2+)格位;在Ca5(PO4)3FBi和Sr5(PO4)3FBi中,位于M2+(1)位点的Bi3+可被电荷补偿等因素的非常规还原作用还原为Bi2+,Bi掺杂的Ca5(PO4)3F和Sr5(PO4)3F有望成为一类新型的黄白色荧光粉。

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