Eu(BA)_3.phen·H_2O/PVP复合薄膜的制备与表征

Synthesis and characterization of Eu(BA)_3.phen·H_2O/PVP composite films

将Eu(BA)3.phen·H2O掺杂到聚乙烯吡咯烷酮(PVP)中制备了三元稀土配合物/PVP复合薄膜。首先,在乙醇/水溶剂中合成了铕(Eu3+),苯甲酸(BA),1,10-邻菲啰啉(phen)的三元稀土配合物。然后以乙醇和N,N-二甲基甲酰胺为溶剂,按稀土配合物与PVP质量比为1∶9,将稀土配合物掺杂到PVP溶液中。最后将混合液滴到聚四氟乙烯基片上,制备出Eu(BA)3.phen·H2O/PVP复合薄膜。复合薄膜在可见光区具有很好的透明性。通过元素分析、红外光谱、X射线衍射分析和荧光光谱对样品进行了表征。确定稀土配合物的组成为Eu(BA)3.phen·H2O。红外光谱结果表明:复合薄膜中PVP与稀土配合物分子之间有相互作用;X射线衍射结果表明:稀土配合物在与PVP复合过程中出现了某些晶面的定向生长;发射光谱结果表明:PVP复合薄膜具有Eu3+的红色特征发射。与稀土配合物相比PVP复合薄膜中Eu3+离子周围的局域对称性降低。激发光谱结果表明:PVP与Eu3+之间可能有能量传递。

The ternary rate earth complex/polyvinylpyrrolidone （PVP） composite film was prepared by doping the rare earth complex of Eu（BA）3.phen·H2O into PVP. Ternary complex of Eu3＋ with benzoic acid （BA） and 1,10- phenanthroline （phen） was synthesized in the alcohol/water mixed solvent, and then incorporated into PVP solution （the mass ratio of rare earth complex to PVP is 1 ： 9） ,in which the ethanol and N,N-dimethylformamide （DMF） were used as solvent. Ternary rare earth eomplex/PVP eomposite film was prepared by doping the mixed solution on a teflon substrate. The composite film is transparent in the visible range. The elemental analysis, infrared speetroscopy （IR）, X-ray diffraction （XRD） and fluoreseence spectra were used to characterize the samples. The chemical composition of the dedueed rare earth complex is Eu（BA）3.phen·H2O. The results of IR exhibit that there is interaction between PVP and rare earth eomplex molecules in the composite film. The results of XRD show that the oriented growth of some crystal plane might appear. The results of emission spectra show that PVP composite film emits red-characteristics lumineseence of Eu3＋ , and the local symmetry around Eu3＋ decreases in PVP composition film compared with that of rare earth complex. The excitation spectra indicate that efficient energy transfer occurs between PVP and Eu3＋.