Y2O3:Eu纳米晶的硝基取代苯甲酸配合物固相热解制备和性能

以苯甲酸、邻硝基苯甲酸、间硝基苯甲酸、对硝基苯甲酸、3,5 二硝基苯甲酸等为配体制备了Y3+、Eu3+二元配合物,配合物中Y3+与Eu3+的摩尔比为9：1.利用这些配合物的爆炸式热分解特性通过固相热解反应制备了一系列Y2O3:Eu纳米晶.透射电镜观察,可以看出所得纳米晶呈球形,粒度介于40～60 nm,X射线衍射分析表明实验所得纳米晶属立方晶系,粒径与电镜观察所得结果基本一致；Eu3+的引入并不影响Y2O3的晶相组成；配体类型对纳米晶的结构没有显著影响,不过相对于硝基取代苯甲酸配合物,苯甲酸配合物热解所得Y2O3∶Eu纳米晶团聚严重；退火温度显著影响纳米晶粒度,退火温度高,纳米晶粒度大,反之亦然.荧光光谱测定表明所有Y2O3∶Eu纳米晶具有相似的发光行为,其中以苯甲酸配合物分解所得Y2O3:Eu纳米晶发光性能最为优越.

Properties of Y2O3:Eu Nanocrystals Prepared by Thermodecomposition of Benzoic Acid

A series of Y3+ and Eu3+ complexes have been synthesized by taking benzoic acid,o nitrobenzoic acid,m nitrobenzoic acid,p nitrobenzoic acid and 3,5 dinitrobenzoic acid as ligands.Based upon the properties of the explosive decomposition of the complexes,a number of Y2O3:Eu nano crystals have been prepared by solid state thermo decomposition.TEM,X ray diffraction analyses show that the Y2O3:Eu nano crystallites have spherical structure,and the average size of the crystals is within 40～60 nm.Introduction of Eu3+ has little effect upon the crystal structure of the oxides.Furthermore,change in the structure of the ligands of the complexes does not affect the morphology and sizes of the final products significantly.Compared with the products from the nitro substituted benzoic acid complexes,however,the Y2O3:Eu nano crystals obtained from benzoic acid complex aggregated severely.It is to be noted that annealing temperature has an obvious effect upon the sizes of the final products.The higher the temperature is,the larger the nano crystals will be.Fluorescence measurements demonstrated clearly that all the Y2O3:Eu nano crystallites luminescence similarly.But,the luminescent property of the one prepared by benzoic acid complex is the superior one.