镧掺杂对Ag-SiO_2复合薄膜光学性能的影响  

Influence of Doping of Lanthanum on Optical Properties of Ag-SiO_2 Composite Thin Films

作　　者：何峰[1] 李锦[1] 谢俊[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070

出　　处：《中国稀土学报》2008年第4期421-425,共5页Journal of the Chinese Society of Rare Earths

基　　金：湘潭大学低维材料及其应用技术教育部重点实验室开放研究基金(KF0603)资助项目

摘　　要：利用溶胶-凝胶法在浮法玻璃上制备了Ag-SiO2复合薄膜,通过改变镧的掺入量得到不同的试样。利用GD751型紫外-可见分光光度计和RF-5301PC型荧光光度计研究了试样的光吸收性能、光致发光性能,并对其发光机制进行初步探讨。在Ag/Si=0.03的浓度,以及500℃/30 min的热处理条件下,通过掺杂非荧光稀土离子La3+可以实现激发过程中能量的传递,La3+的掺杂会影响复合薄膜的光致发光性能。在光吸收性能方面,镧的引入会在一定程度上抑制银粒子的表面等离子共振吸收,同时细化银纳米粒子。The Ag-SiO2 composite thin films were prepared on float glass by sol-gel process. Different sampies were gained by changing the doping amount of lanthanum. The properties of optical absorption and photoluminescence were analyzed by GD751 UV-Visible light spectral photometer and RF-5301PC fluorescent photometer. The luminescence mechanism was proposed. When Ag/Si = 0.03, the optimal optical properties of Ag-SiO2 composite thin films was at 500℃/30 min. Doping of lanthanum ions （La^3＋ ） into the composite could have interesting effect on the film properties. The nonfluorescent ion La^3＋ could help to transfer energy to the main body during the excitation process. La^3＋ would affect the photoIaminescence properties of the composite films. And simultaneously, the doping of La^3＋ could restrain the surface plasma resonance absorption and reduce the size of Ag nanoparticles.

关 键 词：复合薄膜 镧掺杂 光致发光 稀土 

分 类 号：TQ171[化学工程—玻璃工业]