Er^(3+)在二氧化硅介孔分子筛中的高效率发光及其分析  

Highly efficient emission of Er^(3+) in a functionalized mesoporous silica

作　　者：林良书[1] 薛燕陵[1] 蒋器成[1] 张晓敏[2] 吴鹏[2] 刘月明[2] 

机构地区：[1]华东师范大学电子系,上海200062 [2]华东师范大学上海市绿色化学重点实验室,上海200062

出　　处：《物理学报》2008年第9期5989-5995,共7页Acta Physica Sinica

基　　金：上海市科委基础重点项目(批准号:05JC14069)资助的课题~~

摘　　要：研究了一种新型的负载Er3+的二氧化硅介孔分子筛纳米材料,分析了其在有无功能化试剂全氟甲基磺酰(bis(perfluoromethylsulfonyl)amine)修饰作用下的吸收和荧光光谱特性,获得了高强度的荧光发射.应用Judd-Ofelt理论计算了强度参数(Ω2=1.88×10-20cm2,Ω4=5.45×10-20cm2,Ω6=3.11×10-20cm2)、跃迁振子强度、自发跃迁概率、能级辐射寿命等重要的光谱参数,讨论了吸收和发射跃迁截面(Ωem=10.9×10-21cm2),研究了在介孔分子筛纳米材料中的Er3+在不同的抽运功率条件下的荧光强度变化情况.比较了Er3+在不同基质材料中的带宽特性.研究表明二氧化硅介孔分子筛有利于实现高效率的激光输出或具有较宽带宽的高增益光放大,能够成为掺铒激光器或光放大器的新型基质材料.Absorption spectra, emission spectra of nanoized erbium implanted mesoporous silica functionalized with and without bis （perfluoromethylsulfonyl） amine as ligand were studied. Luminescence with high intensity has been obtained. The Judd-Ofeh strength parameters Ωt （ t = 2,4,6）were calculated as Ω2 = 1.88×10^-20 cm^2 , Ω4 = 5.45×10^-20 cm^2 and ,Ω6 = 3.11×10^-20 cm^2 , respectively. Oscillator strength, spontaneous emission probability, branching ratio and emission lifetime of each energy levels of Er^3＋ were given. The peak intensity of emission spectra varying with the pump power was discussed. Stimulated emission cross section （σem = 10.9×10^-21 cm^2 ） was calculated and compared with that of other host materials.

关 键 词：发光 二氧化硅介孔分子筛 稀土离子 JUDD-OFELT理论 

分 类 号：O613.72[理学—无机化学]