Al^(3+) 掺杂BaFBr∶Eu^(2+)中F(Br^- )心的性质(英文)  

Properties of F(Br^-) Centers in BaFBr:Eu^(2+) Doped with Al^(3+)

作　　者：余华[1] 熊光楠[1] 陈士明[2] 严晓敏[2] 郑震[1] 张丽平[1] 

机构地区：[1]天津理工学院材料物理研究所,天津300191 [2]复旦大学分析测试中心,上海200433

出　　处：《发光学报》2002年第6期599-603,共5页Chinese Journal of Luminescence

基　　金：天津市科技委员会重点资助项目 (0 13 180 611) ;天津高教局重点基金资助项目。~~

摘　　要：作为光激励发光的首选材料BaFBr∶Eu2 + ,在其中掺杂一定量的Al3 + 后 ,其光激励发光谱向长波方向发生了较大的红移现象。红移的机理是掺杂的Al3 + 离子取代了BaFBr∶Eu2 + 晶格中的Ba2 + 离子 ,且处于F(Br-)心的次近邻位所致。本文利用喇曼光谱和电子顺磁共振谱对受掺杂Al3 + 微扰的F(Br-)心的结构进行了研究 ,首次在喇曼光谱的高频移区观测到了由于掺杂Al3 + 所引起的新结构的产生 ,通过电子顺磁共振谱表征了在BaFBr∶Eu2 + 中Al3 + 与F(Br-)心的相对位置 ,并且得出F(Br-)心与O-F 心存在着空间相关性。BaFBr∶Eu2+ is a good photostimulated luminescent(PSL) material. The experiments show that compared with BaFBr∶Eu2+, the phosphor BaFBr∶Eu2+ doped with Al3+ has strong redshift PSL peaks. The redshift mechanism is considered as the replacement of Ba2+ by Al3+ doped in BaFBr∶Eu2+ and the location of Al3+ is at next neighborhood to F(Br-) centers. The spectra of Raman scattering and electron paramagnetic resonance(EPR) were used to investigate the structure of F(Br-) centers effected by Al3+. The new Raman peak structure is found at high frequency region due to the fact that Al3+ doped in BaFBr∶Eu2+. The site relationship of Al3+ and F(Br-) centers is observed and the spatial correlation between F (Br-) centers and O-F centers was studied by EPR spectra.

关 键 词：Al^3+掺杂 BAFBR:EU^2+ F(Br^-)心 性质 光激励发光 喇曼光谱 电子顺磁共振 铝离子掺杂 结构分析 铕(Ⅱ) 红移现象 

分 类 号：O614.233[理学—无机化学] O48[理学—化学]