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Eu3+激活的La2 (Mo,S)2O9粉体的结构及光致发光

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Abstract:

用高温固相反应合成稀土Eu3+激活的La2Mo2–ySyO9(y=0~0.07)钼酸盐红色荧光粉,并表征样品的结构和光致发光特性。X射线衍射分析表明少量S取代Mo进入晶格后,样品的结构没有发生明显改变,仍为β-La2Mo2O9立方相,但晶胞参数随S掺杂浓度的增加逐渐减小。光致发光测试表明样品均显示Eu3+的红光特征发射(5D0→7F2),主发射峰位于615nm附近;以615nm为监测波长所得的激发光谱中,位于465nm对应于Eu3+的线谱跃迁(7F0→5D2)最强,尤其当掺杂少量S后,Eu3+的红光发射强度明显增加,可达到La2Mo2O9Eu发光强度的2倍。

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