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0.540×10-20 cm2, 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851 nm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。

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 851 nm corresponding to 2H11/2→4I15/2, 4S3/2→4I15/2, 4F9/2→4I15/2, and 4S3/2→4I13/2 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