五磷酸钆晶体中Sm^(3+)的光谱  

Spectra of Sm^(3+)Ions in GdP_5O_(14)Crystals

作　　者：于亚勤[1] 宋小羽[1] 李玫[1] 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《人工晶体学报》1989年第1期39-44,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金

摘　　要：本文研究了 GdP_5O0_(14):Sm^(3+)(GdPP:Sin)晶体的激发光谱和荧光光谱。Sm^(3+)离子的4~G_5/2→~6H_7/2跃迁的荧光发射(594nm)很强,荧光强度是 Sm^(3+)离子浓度的函数。Sm^(3+)—Sm^(3+)离子间有较严重的浓度猝灭现象。讨论了 Gd^(3+)—Sm^(3+)和 Sm^(3+)—Sm^(3+)离子间的能量传移与猝灭。给出了 GdPP 晶体中 Sm^(3+)离子的能级图。The growth of CdP_5O_(14):S(CdPP:Sm)single crystals by hydro-thermal method was studied and the excitation and emission spectra of thecrystals were measured and analyzed at room temperature.Most of the obser-ved emissions and excitations can be uniquely assigned in terms of the speci-fic transitions between levels in the 4f shell of Sm^(3+)ions.And,furthermore,most of the predicted transitions have been observed.The symmetry-deter-mined electric and magnetic dipole selection rules for the C_(2o)site symmetryare obeyed quite well.The emission lines are observed at 557-564nm(~4G_(5/2)→~6H_(5/2)),583-603nm(~4G_(5/2)→~6H_(7/2)),639-658nm(~4G_(5/2)→~6H_(9/2))and 695-701nm(~4G_(5/2)→~6H_(11/2)).The strongest band is at 594nm.The energy transfer from Gd^(3+)to Sm^(3+)ions takes place by nonradiativetransfer.When the concentration of Sm^(3+)increase to about 0.2,the fluore-scence of Gd^(3+)ions exhibits a maximum,and beyond this value concentra-tion quenching occurs,representing that the emission intensity is a function ofSm^(3+)concentration.The point at which the concentration quenching occurscan not be located exactly.

关 键 词：五磷酸钆 晶体 SM^3+ 光谱 

分 类 号：O734.3[理学—晶体学]