【摘要】 研究了一组Tb3+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 Gd3+ 离子向发光中心 Tb3+ 的能量转移机制以及在一定浓度范围内 Tb3+ 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Gd3+紫外发射光的减弱及 Tb3+ 绿发射光的增强,后者则显示Tb3+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La3+的引入对发光中心 Tb3+ 离子具有分离效应,使Tb3+之间的交叉弛豫概率降低,蓝发射光增强。更多还原

【Abstract】 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 Gd³⁺ cations towards Tb³⁺ emssion centers as well as the cross relaxation among Tb³⁺ cations within the certain concentration range exert tremendous effects on the emission intensity of glasses. The former involves the enhanced Tb³⁺ green emission at the cost of Gd³⁺ UV emission while the latter was associated with the self-sensitizing effect of Tb³⁺ under the certain Tb³⁺ concentration range which contributes to the enhanced Tb³⁺ green emission and the weakened Tb³⁺ blue emssion. It is also found that addition of the third type of rare earth cation La³⁺ plays a role of partitioning Tb³⁺ in the glass matrix by showing the reduced cross relaxation probability among Tb³⁺ cations corresponding to the enhanced Tb³ blue emission.更多还原