中文摘要：

采用溶胶-凝胶法制备了1mol%、3mol%、5mol%、8mol%Ho^3＋掺杂的Ba（0.65）Sr（0.35）TiO3薄膜,研究了薄膜的表面AFM、XRD谱、光学透射谱和光致发光谱.结果表明：Ho^3＋浓度从1mol%增加到8mol%时,BST薄膜的晶格常数先增大后减小;位于615、650和750nm处的发光,分别对应^5F3→^5F7、^5F5→^5F8和^5S2、^5F4→^5F7的跃迁,发光谱和^5S2,^5F4的寿命谱分析表明,在Ho^（3＋）浓度为3mol%时三个发光带强度均最大.并分析了Ho^（3＋）与Ba^（2＋）/Sr^（2＋）/Ti^（4＋）的离子位置替代机制及交叉弛豫机制.

英文摘要：

Barium-strontium titanate （Ba0.65Sr0.35TiO3） films doped with Ho^3＋（1mol%, 3mol%, 5mol%, 8mol%） were prepared by the sol-gel technique. The AFM, XRD, UV-Vis spectra and photoluminescence （PL） spectra of BST films were investigated. Results show that the lattice parameters of BST films increase when Ho^3＋ dopant increases from 1mol% to 3mol% then decrease with Ho^3＋ dopant from 3mol% to 8mol%. The lights centered at about 615, 650 and 750nm are corresponding to the transitions of ^5F3 → ^5F7, ^5F5→ ^5F8 and ^5S2, ^5F4 → ^5F7, respectively. The lifetime spectra of ^5S2, ^5F4 and three PL spectra above indicate that the luminescence intensity reach the maximum in 3mol% Ho^3＋-doped BST films. The optimized Ho^3＋ dopant in BST films is 3mol%. The crossing relaxation mechanisms and site-substituting between Ho^3＋ and Ba^2＋/Sr^2＋/Ti^4＋ are analyzed.