Ba_(1-x-y)Eu_xGd_yMgF_(4+y)复合氟化物中Eu^(2+)离子的f-f跃迁线谱发射  

The Narrow Line Emission of the f-f Transition of Eu^(2+) in Ba_(1-x-y) Eu_xGd_ yMgF_(4+y) Complex Fluoridex

作　　者：石士考[1] 刘行仁[2] 

机构地区：[1]河北师范大学西校区化学系 [2]中国科学院长春物理研究所

出　　处：《Chinese Journal of Chemical Physics》1998年第3期206-210,共5页化学物理学报（英文）

摘　　要：报道了Ｇｄ３＋与Ｅｕ２＋共掺杂的钡镁复合氟化物在室温下的发射光谱中，不仅存在Ｅｕ２＋的带状发射，而且还出现了Ｅｕ２＋的４ｆ（６Ｐ７／２）－４ｆ（８Ｓ７／２）线谱发射。在该体系中，由于Ｇｄ３＋掺入后，诱导出了另一种Ｅｕ２＋的线谱发射中心。两种Ｅｕ２＋发射中心的激发光谱明显不同。ｆ－ｆ跃迁线谱发射的强度与Ｇｄ３＋及Ｅｕ２＋的浓度密切相关。The emission spectrum of Eu 2+ ion in Ba 1-x-y Eu x MgF 4 ( x <0.10) does not show the narrow line emission of the f-f transition of Eu 2+ .However,When Gd 3+ and Eu 2+ ions are codoped in BaMgF 4,not only the band emission of the d-f transition of Eu 2+ is observed,but also the narrow line emission of the 4f( 6P 7/2 )=4f( 8S 7/2 ) of Eu 2+ ion is exhibited.The intensity of the narrow line emission depends on the concentration of Gd 3+ ( y ) and that of Eu 2+ (x). The results show that the effect of Gd 3+ on Eu 2+ is not the sensitization.The Gd 3+ ions in the system induce the production of the f-f transition of Eu 2+ .The presence of the f-f transition of Eu 2+ in the emission spectrum is due to the increase of the coordination number of Eu 2+ in hosts.The coordination number of Eu 2+ in Ba 1-x-y Eu x Gd y MgF 4+y could be 10.

关 键 词：复合氟化物 发射光谱 钡 镁 铕离子 线谱发射 

分 类 号：O614.338[理学—无机化学]