空气条件下合成的CaBPO_5:Eu、SrB_4O_7:Eu和Ba_3(PO_4)_2:Eu的XANES和发光性质  

XANES and luminescence of CaBPO_5:Eu, SrB_4O_7:Eu and Ba_3(PO_4)_2:Eu prepared in air

作　　者：梁宏斌[1] 赫泓[2] 曾庆华[2] 王淑彬[2] 苏锵[3] 胡天斗[4] 谢亚宁[4] 张静[4] 刘涛[4] 吴自玉[4] 

机构地区：[1]中山大学光电材料和技术国家重点实验室化学与化学工程学院,广州510275 [2]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022 [3]中山大学光电材料和技术国家重点实验室 化学与化学工程学院,广州510275 [4]中国科学院高能物理研究所同步辐射实验室,北京100039

出　　处：《核技术》2003年第12期905-908,共4页Nuclear Techniques

基　　金：国家重点基础研究规划(批准号:G1998061312);北京正负电子对撞机国家实验室重点课题资助

摘　　要：测定了采用高温固相反应在空气条件下合成的发光体CaBPO_5:Eu、SrB_4O_7:Eu和Ba_3(PO_4)_2:Eu的Eu-L_3边的X射线吸收近边结构(XANS)谱和发光光谱。从发光体的Eu-L_3边XANES可见,Eu^(3+)-L_3边能量比Eu^(2+)-L_3边能量高7—8eV;3个发光体的激发光谱和发射光谱均可看到Eu^(2+)的4f-5d跃迁和Eu^(3+)的4f-4f跃迁。发光体的Eu-L_3边的XANES和发光光谱说明空气条件下合成的发光体中Eu^(3+)可部分还原为Eu^(2+)。The Eu-L3 edge XANES and luminescent spectra of CaBPO5:Eu, SrB4O7:Eu and Ba3(PO4)2:Eu prepared by solid state reaction at high temperature in air were determined. It can be observed from the Eu-L3 edge XANES spectra that energy of Eu3+-L3 edge is 7-8 eV higher than that of Eu2+-L3 edge in the luminescent materials. The 4f-5d transition of Eu2+ and the 4f-4f transition of Eu3+ can be found simultaneously in the excitation and emission spectra of these materials, respectively. The results of Eu-L3 edge XANES and luminescent spectra imply that Eu3+ can be partially reduced to Eu2+ in these materials when they were prepared in air atmosphere.

关 键 词：铕 硼磷酸钙 四硼酸锶 磷酸钡 X射线吸收近边结构 发光性质 发光体 空气条件 合成 

分 类 号：O614.33[理学—无机化学] TN104.3[理学—化学]