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电荷补偿剂对Sr2MgSi2O7:Eu3+红色发光粉结构和性能的影响

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Abstract:

采用微波辅助凝胶燃烧法制备Sr2MgSi2O7Eu3+,R+(R=Li,Na,K)系列红色发光粉,通过X射线粉末衍射、荧光分光光度计等分析表征荧光粉的结构以及发光性能。结果表明Sr2MgSi2O7Eu3+,R+(R=Li,Na,K)系列红色发光粉的晶体结构与Sr2MgSi2O7的相同,属四方晶系;加入电荷补偿剂Li+、Na+及K+对Sr2MgSi2O7Eu3+的激发和发射光谱的峰形、峰位影响较小,在277、395nm处都有较强的激发峰,分别归属于Eu3+–O2–之间的电荷迁移态和Eu3+的f→f跃迁;发射光谱主要由位于593nm和616nm处两个强发射峰组成,分别归属于Eu3+的5D0→7F1磁偶极跃迁和5D0→7F2电偶极跃迁;电荷补偿剂Li+、Na+及K+的加入,均能明显提高Sr2MgSi2O7Eu3+的激发与发射峰的强度,最佳摩尔掺量均为8%,其中Li+掺杂效果最为显著,616nm处发射峰强度约为单掺Eu3+样品的2倍。

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