中文摘要：

采用溶胶-凝胶法制备Ho3＋：Ba0.8Sr0.2TiO3（BST）纳米粉体.根据Judd-Ofelt理论对纳米粉体的吸收光谱进行拟合,得到晶体场强度参数Ω2、Ω4和Ω6分别为0.229×10-20、0.515×10-20和0.761×10-20cm2,并系统计算Ho3＋各能级跃迁的振子强度、自发辐射跃迁几率、荧光分支比和辐射寿命等光谱参数.在514nm的氩离子激光激发下,样品出现了中心波长位于549、650、706和753nm的发光带,分别对应于（5F45,S2）→5I85、F5→5I8、5I4→5I8和（5F45,S2）→5I7的跃迁,计算出中心波长位于549、650、706和753nm处发光带的受激发射截面分别为3.26×10-21、0.19×10-21、0.04×10-21和5.53×10-21 cm2.结果表明Ho3＋：BST材料在新型光电子器件中有广泛的应用前景.

英文摘要：

Ba0.8Sr0.2TiO3（BST） nanopowers doped with Ho3＋ were prepared by sol-gel method.Using the Judd-Ofelt theory,according to the absorption spectrum the intensity parameters Ωλ of Ho3＋ in BST nanopowers were fitted,Ω2 = 0.229×10-20 cm2,Ω4 =0.515×10-20 cm2 and Ω6=0.761×10-20 cm2,and then the values of the oscillator strength,radiative transition probabilities,branching ratios and radiative lifetime of Ho3＋ were calculated.Under excitation of 514 nm Ar＋ laser,the emission bands centered at about 549 nm,650 nm,706 nm and 753 nm corresponding to（5F4,5S2）→5I8、5F55→I8,5I4→5I8 and（5F4,5S2）→ 5I7 transition were observed.The stimulate emission cross-section of the emission bands centered at about 549、650、706 and 753 nm had been calculated,the values respective were 3.26×10-21、0.19×10-21、0.04×10-21、5.53×10-21 cm2.The results showed that the Ho3＋：BST nanomaterials were prospective candidates for applications in new photoelectric devices.