中文摘要：

用溶胶-凝胶法制备了Er3＋：Ba0.65Sr0.35TiO3（BST）纳米粉体,测试了纳米粉体在室温下的吸收光谱与光致发光谱。利用Judd-Ofelt理论拟合得到晶体场强度参数Ω2,Ω4和Ω6分别为0.993×10-20,1.665×10-20和0.540×10-20cm2,系统计算了Er3＋能级跃迁的谱线强度、自发辐射跃迁概率、荧光分支比等光谱参数。发光谱表明,样品出现了中心波长位于522,545,654和851nm的发光带,分别对应Er3＋的2H11/2→4I15/2,4S3/2→4I15/2,4F9/2→4I15/2和4S3/2→4I13/2的跃迁。讨论了样品的发光特性。结果表明Er3＋：BST纳米材料在新型光电子器件中有广泛的应用前景。

英文摘要：

Ba0.65Sr0.35TiO3（BST）nanopowders doped with Er3＋ were prepared by sol-gel method.The absorption spectrum and photoluminescence（PL）spectrum of Er3＋：BST nanopowders was measured at room temperature.Based on the Judd-Ofelt theory,the intensity parameters of Er3＋ in BST nanopowders were determined,Ω2=0.993×10-20 cm2,Ω4=1.665×10-20 cm2 and Ω6=0.540×10-20 cm2,and then the values of the line strengths,radiative transition probabilities and branching ratios of Er3＋ were calculated.According to the PL spectrum,the emission bands centered at about 522,545,654 and 851nm corresponding to 2 H11/2→4I 15/2,4 S3/2→4I 15/2,4 F9/2→4I 15/2,and 4 S3/2→4I 13/2 transition were observed,and the emission properties were also discussed.The results show that the Er3＋：BST nanomaterials are prospective candidates for applications in new photoelectric devices.