Structure and photoluminescence properties of Er^(3+)-doped TiO_2-SiO_2 powders prepared by sol-gel method  

作　　者：赵建果 张伟英 马紫微 谢二庆 赵阿可 刘照军 

机构地区：[1]College of Physics and Electronic Information,Luoyang Normal College [2]School of Physical Science and Technology,Lanzhou University

出　　处：《Chinese Physics B》2011年第8期429-434,共6页中国物理B（英文版）

基　　金：Project supported by the Key Science and Technology Program of Henan Province of China (Grant Nos. 102102210448 and 102102210452);the Scientific Research Fundation of the Education Department of Henan Province,China (Grant No. 2010A140011)

摘　　要：Er3＋-doped TiO2-SiO2 powders are prepared by the sol-gel method, and they are characterized by high resolution transmission electron microscopy （HR-TEM）, X-ray diffraction （XRD） spectra, and Raman spectra of the samples. It is shown that the TiO2 nanocrystals are surrounded by an SiO2 glass matrix. The photoluminescence （PL） spectra are recorded at room temperature. A strong green luminescence and less intense red emission are observed in the samples when they are excited at 325 nm. The intensity of the emission, which is related to the defect states, is strongest at the annealing temperature of 800℃. The PL intensity of Er3＋ ions increases with increasing Ti/Si ratio due to energy transfer between nano-TiO2 particles and Er3＋ ions.Er3＋-doped TiO2-SiO2 powders are prepared by the sol-gel method, and they are characterized by high resolution transmission electron microscopy （HR-TEM）, X-ray diffraction （XRD） spectra, and Raman spectra of the samples. It is shown that the TiO2 nanocrystals are surrounded by an SiO2 glass matrix. The photoluminescence （PL） spectra are recorded at room temperature. A strong green luminescence and less intense red emission are observed in the samples when they are excited at 325 nm. The intensity of the emission, which is related to the defect states, is strongest at the annealing temperature of 800℃. The PL intensity of Er3＋ ions increases with increasing Ti/Si ratio due to energy transfer between nano-TiO2 particles and Er3＋ ions.

关 键 词：TIO2-SIO2 SOL-GEL RAMAN PHOTOLUMINESCENCE 

分 类 号：TN304.21[电子电信—物理电子学]