摘要
采用Ｓｏｌ－Ｇｅｌ方法首次在比较低的温度下制备了具有氧磷灰石结构的发光体Ｍｇ２Ｙ８－ｘ－ｙ（ＳｉＯ４）６Ｏ２：Ｅｕ，Ｂｉ（ｘ，ｙ≥０），利用ＸＲＤ、ＩＲ、ＴＧ－ＤＴＡ三种手段研究了发光体的形成过程。室温（２９３Ｋ）和液氮温度（７７Ｋ）的荧光光谱表明Ｅｕ３＋和Ｂｉ３＋在这种基质中分别发射红光和蓝光，每ｍｏｌ基质中其最佳掺杂浓度分别为０．１４ｍｏｌ和０．０３ｍｏｌ，并且其发光都存在温度猝灭。Ｅｕ３＋的激光感生荧光光谱中存在两条５Ｄ０－７Ｆ０跃迁线，表明Ｅｕ３＋同时进入４ｆ格位和６ｈ格位。在Ｅｕ３＋、Ｂｉ３＋共掺杂的发光体中，观察到了Ｂｉ３＋→Ｅ３＋的部分能量传递。
The luminophors Mg2Y3-x-y(SiO4)6O2:Eu ,Bi (x, y≥0) with oxyapatite structure were prepared by Sol-Gel method at relatively low temperature for the first time. The formation process of the luminophor was investigated by the methods of IR, TG-DTA and XRD. From the fluorescence spectra, it is known that Eu3+ and Bi3+ emit red light (615nm,5D0-7F2) and blue light (430nm,3P1-1S0) in this host lattice, respectively.There exists temperature quenching for the luminescence of Eu3+ and Bi3+ ions,and their optimum concentrations are 0. 14mol and 0.03mol, respectively.The appearance of two 5D0-7F0 lines of the Eus+ ions in its fluorescence Raman'spectrum indcates that Eu3+ ion enter 4f sites and 6h sites simultaneously in the luminophor.An energy transfer from Bi3+ to Eu3+ was observed in the luminophor codoped with them.
出处
《光谱学与光谱分析》
CSCD
北大核心
1994年第6期21-28,共8页
Spectroscopy and Spectral Analysis
基金
稀土化学与物理开放实验室资助
