Er^(3+)掺杂钡镓锗玻璃上转换荧光淬灭机理研究  

Upconversion Fluorescence Quenching in Er^(3 +)-Doped Barium Gallogermanate Glasses

作　　者：肖凯[1] 杨中民[1] 

机构地区：[1]华南理工大学特种功能材料及其制备新技术教育部重点实验室,广东广州510640

出　　处：《稀有金属材料与工程》2008年第1期80-84,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(60307004和50402007);广东省科技攻关项目(2005A10602001和2004A10602002);广州市科技计划项目(2004Z2-D0131);教育部新世纪人才项目(NCET-04-0821)资助

摘　　要：制备了30BaO-30Ga2O3-40GeO2-xEr2O3系统玻璃,测量了Er3+在钡镓锗玻璃中的吸收光谱。分别采用488nm,800nm和980nm激发不同浓度Er3+掺杂的玻璃样品,测量了Er3+的4S3/2→4I15/2荧光光谱;并利用488nm脉冲氙灯激发,测量了Er3+的4S3/2→4I15/2荧光衰减,讨论了Er3+掺杂浓度对4S3/2能级发光强度和荧光寿命的影响。结果表明:随着Er3+浓度的增加,4S3/2→4I15/2荧光强度先增大后减小,在Er3+浓度为1%时出现峰值;而4S3/2能级的荧光寿命呈递减趋势,荧光衰减曲线的非指数成分增加。能量分析表明:Er3+的4S3/2能级和4I15/2能级之间交叉驰豫过程是上转换荧光淬灭的主要通道,而交叉驰豫过程主要源于Er3+电偶极-电偶极间的相互作用。The barium gallogermanate glass doped with different Er^3＋ ion concentrations have been fabricated and the absorption spectra have been measured. The fluorescence spectra excited respectively by 488 nm continuous-wave Xenon lamp, 800nmLD and 980nmLD have been recorded and the fluorescence decay excited by 488nm pulse Xenon lamp has also been measured. The effect of Er^3＋ ion concentration on the fluorescence intensity and lifetime of the ^4S3/2→^4I15/2 transition has been analyzed. With increasing Er^3＋ ion concentrations, the fluorescence intensity and fluorescence lifetime of the ^4S3/2→^4I15/2 transition decrease, and the deviation degree of the fluorescence decay curve to a single exponential function increases. It is shown via energy analysis that the upconversion fluorescence quenching is mainly originated from the cross relaxation processes between the ^4S3/2 level and the ^4I15/2 level of Er^3＋ ions, and the theoretical calculation verify that the cross relaxation processes stem from dipole-dipole interaction of Er^3＋ ions.

关 键 词：ER^3+掺杂 钡镓锗玻璃 荧光淬灭 

分 类 号：TQ171.1[化学工程—玻璃工业]