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基于DSCPCF模型,本文给出LaOX:Eu~3(+)(X~-=Cl~-,Br~-,I~-)和Ln0Cl:Tb~(3+)(Ln~(3+)=La~(3+),Gd~(3+),Y~(3+))系列磷光体的配位场微扰能级,并对其液氮及液氦温度下的荧光光谱进行了理论归属.结果表明:(1)DSCPCF微扰能级与实测光谱较好吻合;(2)随着基质阴离子(Cl~-→Br~-→I~-)或阳离子(Y~(3+)→Gd~(3+)→La~(3+))离子半径增大,电负性降低,晶场参数B_m~k呈增大趋势;(3)配位场微扰导致的电子云膨胀效应与DSCPCF模型的特征参数——配体有效核电荷Z_j~*及键电荷qi的变化趋势相一致;(4)与PCF模型相比,DSCPCF模型使B_m~k的计算结果得到明显改善。
Based on the DSCPCF model, LaOX: Eu ~ 3 (+) (X ~ - = Cl ~ -, Br ~ -, I ~ -) and Ln0Cl: Tb ~ (3 +) (Ln ~ (3 +) = La (3 +), Gd ~ (3 +) and Y ~ (3+) series of phosphors have been studied. The fluorescence spectra of liquid phosphors at liquid nitrogen and liquid helium have been theoretically assigned. The results show that: (1) The perturbation energy level of DSCPCF is in good agreement with the measured spectra; (2) With the increase of anion (Cl ~ - → Br ~ - → I ~ -) or cation (3+) → La ~ (3+) ions increased, the electronegativity decreased and the B_m ~ k parameter increased. (3) The dilation effect of the electron cloud caused by the perturbation of the ligand field and DSCPCF model (4) Compared with the PCF model, the DSCPCF model results in a significant improvement of the B_m ~ k calculation results.