Gd3+-Tb3+能量转移与Tb3+自敏化效应对重金属锗酸盐玻璃发光性能的影响

研究了一组Tb^3 掺杂重金属锗酸盐玻璃的发光特性。玻璃样品的X射线激发发射光谱结果显示，玻璃基质中由Gd^3 离子向发光中心Tb^3 的能量转移机制以及在一定浓度范围内Tb^3 之间的交叉弛豫过程对玻璃的发光性能有重要影响。前者表现在Gd^3 紫外发射光的减弱及Tb^3 绿发射光的增强，后者则显示Tb^3 在一定浓度范围内所特有的自敏化效应，使其蓝发射光减弱、绿发射光增强。第3种稀土离子La^3 的引入对发光中心Tb^3 离子具有分离效应，使Tb^3 之间的交叉弛豫概率降低，蓝发射光增强。

Effects of Gd3+-Tb3+ energy transfer and Tb3+ self-sensitization on luminescent properties of Tb3+-doped heavy germanate glasses

Luminescent properties of some terbium-doped heavy germanate glasses were studied in the present work. Results of meausred radioluminescence spectra show that energy transfer mechanisms occurring from Gd~(3+) cations towards Tb~(3+) emssion centers as well as the cross relaxation among Tb~(3+) cations within the certain concentration range exert tremendous effects on the emission intensity of glasses. The former involves the enhanced Tb~(3+) green emission at the cost of Gd~(3+) UV emission while the latter was associated with the self-sensitizing effect of Tb~(3+) under the certain Tb~(3+) concentration range which contributes to the enhanced Tb~(3+) green emission and the weakened Tb~(3+) blue emssion. It is also found that addition of the third type of rare earth cation La~(3+) plays a role of partitioning Tb~(3+) in the glass matrix by showing the reduced cross relaxation probability among Tb~(3+) cations corresponding to the enhanced Tb~3 blue emission.