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硫脲用量对燃烧法制备的Y_2O_2S:Sm~(3+)发光性能的影响(英文)

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Abstract:

利用硫脲作为燃料(fuel,F),以Sm(NO3)3·6H2O,Y(NO3)3·6H2O为氧化剂(oxidizer,O),通过燃烧法制备了白光发光二极管用Y2O2SSm3+红色荧光粉,并研究了其发光性能以及硫脲用量等反应条件对发光性能的影响。X射线衍射结果表明当燃料与氧化剂的摩尔比[n(F)/n(O)]为2.0~4.0时,通过燃烧法可合成纯相Y2O2S。n(F)/n(O)的值对样品的反应速度和反应温度有很大的影响。扫描电镜结果表明当n(F)/n(O)为3.0时,可以得到粒度和发光强度较好的Y2O2SSm3+荧光粉。测量了Sm3+离子摩尔分数为3%时的激发光谱和发射光谱。样品的激发光谱由1个宽带和一系列的尖峰组成,其中位于412nm和468nm处的激发峰最强。发射光谱由3个发射带组成,其中发射主峰分别位于570nm,606nm和658nm。这表明Y2O2SSm3+可被波长为412nm的紫光和468nm的蓝光有效的激发并发出红光。

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