中文摘要：

研究了70TeO2-（15-x）ZnO-15Na2O-xB2O3-1wt％Er2O3（x=0、4、8、12和mol％）玻璃系统中B2O3的含量对Er^3＋上转换光谱性质的影响。结果表明：随B2O3含量的增加，Fr^31的^4 I11/2能级寿命减小；^4 I11/2→I13/2无辐射跃迁几率增加；Er^3＋的上转换绿光（^4S3/2、^2H11／2→I15/2）和红光（^4F9/2→4I15/2）减弱。基于Er^3＋在975nm波长激发下的上转换机理，建立了^4F7/2、^H11/2（^4S3/2）、^4H9/2、^4 I11/2和^4I13/2。这5个激发态能级的速率方程，结果表明，上转换绿光和红光强度跟^4 I11/2能级的粒子数的平方存在着正比关系。

英文摘要：

The effect of B2O3 on upconversion fluorescence in 70TeO2-（15-x）ZnO-15Na2O-xB2O3-1wt%Er2O3（x=0、4、8、12 and L5 mol%） glasses has been investigated. The results indicated that,with increasing the B2O3 content in the glass composition,the non-decay rate of ^4S3/2、^2H11/2→I15/2 transition increases, while the lifetime of ^4 I11/2 level and the green- and red-upvonversion fluorescence decrease. A comprehensive five-level rate-equation model based on the^4F7/2、^H11/2（^4S3/2）、^4H9/2、^4 I11/2 and^4I13/2 of the Er^3＋ population dynamics is developed under 975 nm excitation. The model suggests that the green -and red-upconversion intensity is a quadratic dependence on the population density of the ^4 I11/2 level.