稀土配合物作为前驱体合成Y_2O_3∶Eu纳米材料

SYNTHESIS OF Y_2O_3∶Eu NANOCRYSTALLINE BY COMPLEX PRECURSORS

以稀土羧酸配合物为前驱体， 采用快速热分解方法制备了纳米Ｙ２Ｏ３∶Ｅｕ 荧光材料，进行了结构、尺寸及形貌表征． 随着Ｅｕ３＋ 掺杂浓度的提高， 样品的晶胞参数加大， 当Ｅｕ３＋掺杂量高达３０％ 时， 体系仍能保持Ｙ２Ｏ３ 基质的立方相结构； 样品的晶粒度与退火温度及配合物前驱体组成有关． 退火温度越高、前驱体中Ｒｅ３＋ 与配体的摩尔比越小， 样品的粒径越大． 随着Ｅｕ３＋ 掺杂浓度的提高， 激发光谱红移， 发射强度在掺杂浓度分别为５％ 和１０％ 时有极大值； 发射强度与Ｒｅ３＋ 和配体摩尔比及退火温度有关．

Nanoscale Y 2O 3∶Eu phosphors were prepared by thermal decomposition of the rare earth carboxylic acid complexes. The structure, size and morphology of particles were characterized by XRD and HRTEM. The cell parameters of nanoscale Y 2O 3∶Eu are related with the doping concentration of Eu 3+ , annealing temperature and the ratio of rare earth ions(Re 3+ )and carboxylic acid. The size of Y 2O 3∶Eu nanoparticle can be controlled by modifying the ratio of Re 3+ and ligand in the precursor. The excitation spectra shift towards the red when the content of Eu 3+ is increased. The emission intensity is related with the composition of the complexes, the annealing temperature and the concentration of Eu 3+ .