摘要
本文系统地研究了化合物ASm_2I_5(A=K,Rb,Cs,T1)固体粉末的荧光光谱和反射光谱.讨论了Sm^(2+)在立方晶体场中的分裂能随着碱金属离子半径的增大而减小和f-d激发能随着A-I(A=Rb,T1)键的共价性增加而明显降低的现象.并从晶场效应和化学键性质两个方面解释了ASm_2I_5(A=K,Rb,Cs)和ASm_2I_5(A=Rb,T1)中的Sm^(2+)荧光光谱分别发生蓝移和红移的现象.
The fluorescence and reflection spectra of ASm2I5 (,4=:K,Rb,Cs,Tl) in solid state were studied systematically. The splitting energy(AAAAAAAA) and f-d excited energy (Efd)of Sm2+ in cubic crystal lattice field are discussed. It is indicated that the increase in r(A+) leads to the decrease in the crystal lattice field effect, and the covalence effect is decreased because of the increase of electronegativity difference between A+ and I-. As a consequence the Efd is reduced. The fact that the fluorescence spectra shift to red or blue among ASm2I5 can be explained by these effects.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1991年第4期339-343,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金
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基金
