稀土铕高分子荧光配合物的制备及性能研究

稀土配合物作为发光材料已广泛应用于众多领域,为了使材料获得更稳定更持久的发光性能,本文以N-乙烯基甲酰胺(NVF)和丙烯酰胺(AM)为共聚单体,水为溶剂,在高温、引发剂条件下经自由基溶液聚合制备出含有氨基、羧基等多种配位官能团的水溶性高分子聚合物两性聚乙烯胺(PVAm),并以此作为高分子配体,再辅以1,10-邻菲咯啉(phen)作为第二配体,用三价稀土离子铕(Eu)的盐溶液与之配位,制备出具有优良荧光效应的稀土配合物Eu(PVAm)_3phen荧光粉。对高分子配体PVAm进行IR、NMR等分析,找出配位官能团,并对稀土配合物的外观形貌进行荧光显微镜等观察分析,对配合物的结构进行XRD等表征,并分析其紫外光谱、荧光光谱、荧光余辉亮度。配合物在220～275 nm范围内对紫外光有较强的吸收,最大吸收峰在260 nm处。配合物在580、593、614、650 nm的4处有明显的荧光发射峰。

Preparation and properties of rare earth europium polymer fluorescent complexes

Rare earth complexes have been widely used as luminescent materials in many fields. In order to obtain more stable and long-lasting luminescence properties, N-vinylformamide (NVF) and acrylamide (AM) were used as comonomers and water as solvent to prepare water-soluble polymer amphoteric polyvinylamine (PVAm) by free radical solution polymerization under high temperature and initiator condition, which contains various coordination functional groups such as amino groups and carboxyl groups. Coordinated with the salt solution of trivalent rare earth ions (Eu), PVAm was then used as polymer ligand and 1,10-phenanthroline (phen) as the second ligand to prepare a rare earth complex phosphor Eu(PVAm)_3phen with excellent fluorescence effect. The polymer ligand PVAm was analyzed by IR and NMR to find the coordination functional group, and the appearance of the rare earth complex was observed by fluorescence microscope. The structure of the complex was characterized by XRD, and its ultraviolet spectrum, fluorescence spectrum, and fluorescence afterglow brightness were analyzed.The complex has strong UV absorption in the range of 220~275 nm, and the maximum absorption peak is at 260 nm. The complex has obvious fluorescence emission peaks at 580, 593, 614 and 650 nm.