F/Cl比对PbFCl晶体生长和发光性能的影响  

Influence of F/Cl Ratio on the Crystal Growth and Luminescence Properties of PbFCl Crystals

作　　者：张国庆[1,2] 杨帆[2] 吴云涛 孙丹丹[2] 商珊珊[2] 任国浩[2] 

机构地区：[1]中国地质大学(武汉),武汉430074 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《无机材料学报》2014年第2期162-166,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金青年基金(51102254);国家自然科学基金(91022028)~~

摘　　要：PbFCl是一种具有双读出功能的闪烁晶体,性能优异但制备困难。本研究通过调整PbFCl原料组份,探索F/Cl摩尔比(F/Cl)对晶体生长、透光和发光性能的影响。实验结果表明,原料配方中适量富Cl有利于生长出透明晶体,但会加剧解理。组分偏析会使晶胞参数略有改变,而对物相没有影响。X射线激发光谱发光峰位不随F/Cl比改变而移动。透过光谱显示PbCl2组份增加,紫外吸收边会从300 nm蓝移至275 nm附近,F/Cl变化不引入新的吸收峰,EWT计算表明F/Cl=1:1.25时晶体的双读出性能最好。Lead fluoride chloride （PbFC1） crystal has been proposed for dual readout application as it has excellent properties. In this study, the PbFC1 crystals were grown with different F/C1 ratios in the raw materials by modified Bridgman method. It is observed that excessive PbC12 in the raw materials is helpful to grow transparent crystals, meanwhile it may enhance the cleavage. The excessive PbF： or PbCI： only modifies the cell parameters, not the phase of PbFC1 crystal. The emission peaks in X-ray excited luminescence spectra do not depend on the F/C1 ratio in the raw materials. The UV cut-off edge of transmittance shifts from 300 nm to 275 nm when extra PbCI2 was added. According to the emission weighted transmittance of the samples, the crystals grown with F/C1=1：1.25 in the raw materials show the best dual readout properties among all the samples.

关 键 词：PbFCl 组份偏析 发光 透光率 

分 类 号：O734[理学—晶体学]