自极化效应对稀土掺杂聚合物激发和发射光谱的影响(英文)  

The Effects of Self-polarization on Emission and Excitation Spectra of Eu(DBM)_3·Phen Doped in Poly(methyl methacrylate)

作　　者：酒红芳[1] 苏伟[2] 吉耀辉[2] 张其锦[1] 赵辉[2] 梁浩[2] 陈彪[2] 

机构地区：[1]中国科学院结构分析重点实验室 [2]中国科学技术大学高分子科学与工程系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2004年第4期459-464,共6页化学物理学报（英文）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (5 0 0 2 5 3 0 9,90 2 0 10 16)

摘　　要：合成并用FT IR和元素分析方法表征了Eu(DBM) 3·Phen .对不同浓度的稀土络合物溶液和掺杂聚合物的激发光谱和发射光谱进行了测定和研究 ,结果发现在溶液和固体介质中都存在着溶质间的相互作用 .这种自极化相互作用影响包括两个方面 :有机配体的吸收光谱出现红移现象 ;稀土离子的对称性的变化 .自极化相互作用导致分子内的电荷分布变化 ,改变了激发态和基态间的能量 ,激发光谱出现红移 .在低浓度时 ,介质的性质对红移影响较大 ,高浓度时 ,介质的影响变小 .Eu(DBM) 3·Phen was synthesized and its structure was characterized by FT IR and the elementary analysis . Emission and excitation spectra of rare earth complex in solution of methyl methacrylate and in solid matrix of poly(methyl methacrylate) were measured, and the experiments confirmed that an intermolecular solute solute interaction occurred for rare earth complex in solution and solid matrix, which resulted in self polarization. Influence of the self polarization includes two aspects: one is the red shift in absorption of organic ligands, and another is the symmetric changing of Eu 3+ site in the complex. The self polarization effect also causes a stretching of molecular bonds and shifting of charging distribution on molecules, altering the energy difference between the ground and excited states of the solute. At low concentration, the host matrix has effect on this phenomenon; but above certain concentration the difference in host matrix disappears. The other factors are also discussed impacting fluorescence property of rare earth doped systems.

关 键 词：自极化 聚甲基丙烯酸甲酯 Eu(DBM)3·Phen 溶剂化 荧光 

分 类 号：O631.24[理学—高分子化学]