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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
关键词
ER^3+掺杂
钡镓锗玻璃
荧光淬灭
Er^3＋ doping
barium gallogermanate glass
fluorescence quenching
