Ti/Si比例对Tb^(3+)掺杂TiO_2-SiO_2复合粉末的发光影响  

Effect of Ti/Si Ratio on the Photoluminescence of Tb^(3+) Doped TiO_2-SiO_2 Composite Powders

作　　者：赵建果[1] 韩运侠[1] 刘照军[1] 赵阿可[1] 

机构地区：[1]洛阳师范学院物理与电子信息学院,洛阳471022

出　　处：《光散射学报》2012年第2期159-162,共4页The Journal of Light Scattering

基　　金：河南省科技攻关项目(102102210448;102102210452);河南省教育厅自然科学研究计划项目(2010A140011)

摘　　要：用溶胶-凝胶法制备了Tb3+离子掺杂的TiO2-SiO2复合粉末并研究了Ti/Si比例对复合粉末光致发光的影响。采用X射线衍射(XRD)、Raman和光致发光谱(PL)对Tb3+离子掺杂的TiO2-SiO2复合粉末进行了一系列的表征。PL谱的结果表明Tb3+离子5 D4-7F5跃迁对应的550nm绿光发射最强。随着Ti/Si比例的减小,Tb3+离子在可见光范围的发光逐渐增强,这可能是由于Tb3+离子周围环境的非晶化加剧引起的。Tb^3＋ ions doped TiO2-SiO2 composite powders with different Ti/Si ratio were fabricated by sol-gel method. The crystal structure and luminescence properties of the re- sulting powders were separately investigated by X-ray diffraction （XRD）, Raman, and photoluminescence （PL） spectra. The powders showed dominant green emission at 550 nm due to the ^5D4-^7F5 transition of the Tb3^＋ ions. The intensity of visible emission due to Tb^3＋ ions increases with the decreasing of Ti/Si ratio. This result may be due to the in- creasing of amorphous of the surrounding enviroment in Tb^3＋ ions.

关 键 词：TIO2-SIO2 光致发光 非晶 

分 类 号：O469[理学—凝聚态物理] O472.3[理学—电子物理学]