铒离子浓度对掺Er^(3+)碲酸盐玻璃的Judd-Ofelt理论参数的影响  

Influence of Erbium Ion Concentration on Judd-Ofelt Parameters of Er^(3+)-Doped Tellurite Glass

作　　者：周刚[1] 戴世勋[1] 于春雷[1] 张军杰[1] 胡丽丽[1] 姜中宏[1] 

机构地区：[1]中国科学院上海光学精密机械研究所

出　　处：《光谱学与光谱分析》2006年第3期403-407,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(60207006);上海市青年启明星项目(04QMX1448)资助

摘　　要：制备了四种不同铒离子掺杂浓度的碲酸盐玻璃,通过测定吸收光谱计算了吸收谱线的振子强度,根据Judd-Ofelt理论计算了不同浓度下Er3+离子发光光谱的强度参数Ωi(i=2,4,6),计算了自发辐射电偶和磁偶跃迁概率、辐射寿命、荧光分支比等参数,讨论了Er3+离子浓度变化对以上这些参数的影响。测试了Er3+4I13/2→4I15/2跃迁对应的荧光光谱和Er3+4I13/2能级荧光寿命。最后应用McCumber理论计算了玻璃中Er3+4I13/2→4I15/2跃迁对应的受激发射截面大小。结果表明振子强度基本上随Er3+离子浓度的增大而增强;随着Er3+离子浓度的增加,自发辐射跃迁概率A基本呈现出递增的趋势,但荧光分支比β却只有很小的变化;Er3+4I13/2→4I15/2的发射截面随Er3+离子浓度的增大而改变很小,有效线宽都在50nm左右。Er^3＋-doped tellurite glasses with four different concentrations were fabricated, and the oscillator strength of Er^3＋ in the tellurite glasses were calculated through the absorption spectra of the glasses. The Judd-Ofelt intensity parameter Ωi, spontaneous transition probability A, fluorescence branching ratio β, and radiative lifetime τrad of Er^3＋ were calculated on the basis of Judd-Ofelt theory, and the effect of the erbium ion concentration on the above optical parameters was also discussed. The fluo- rescence spectra of Er^3＋ ： ^4I13/2→^4I15/2 transition and the lifetime of Er^3＋ ： 4^I13/2 level of the samples were measured. The stimulated emission cross-section of ^4I13/2→^4I15/2transition of the samples was finally calculated by using McCumber theory. The results show that with the increase in the Er^3＋ concentration, the oscillator strength and spontaneous transition probability A of Er^3＋ increase, while the fluorescence branching ratio β of Er^3＋ shows little difference. The stimulated emission cross-section of Er^3＋ ：^4I13/2→^4I15/2 transition of the samples changes slightly with the increase in the Er^3＋ concentration. All the fluorescence effective line widths for the four different Er^3＋ concentration samples are nearly 50 nm.

关 键 词：Er^3+离子 JUDD-OFELT理论 光谱性质 碲酸盐玻璃 稀土 

分 类 号：TQ171[化学工程—玻璃工业]