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红色荧光粉LiGd(MoO4)2:Sm3+的制备与性能

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Abstract:

利用Sm3+作为激活剂采用高温固相法制备了LiGd1–x(MoO4)2xSm3+(x=0,0.005,0.010,0.015,0.020,0.030,0.040,0.050,0.060,0.080,0.100)系列红色荧光材料。测量了荧光粉的X射线衍射谱、激发光谱和发射光谱。在紫外光的激发下,该荧光粉的发射光谱为峰值位于564、608、648nm的三峰谱线,其中位于648nm处的红光发射最强。监测648nm发射峰得到的材料的激发光谱为一峰值位于275nm的宽谱和主峰位于363、376、404nm的线状谱线,说明该荧光粉可被紫外光和近紫外光有效地激发。研究了Sm3+掺杂浓度对LiGd(MoO4)2Sm3+荧光粉的各发射峰发光强度的影响,得出Sm3+的最佳掺杂量(摩尔分数)为3.0%。对浓度猝灭的原因进行了探讨,结果表明该荧光粉是一种较好的用于白光LED的红色发光材料。

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