Tm3+/Yb3+共掺碲铅锌镧玻璃的能量传递和上转换发光

制备了Tm³⁺/Yb³⁺共掺TeO₂-PbO-ZnO-La₂O₃玻璃，研究了玻璃红外吸收光谱和980 nm激光抽运下上转换发光光谱，分析了上转换发光机制.基于Tm³⁺和Yb³⁺的能级图及上转换机制建立了速率方程，得出了稀土离子各能级的粒子数分布密度以及Tm³⁺与Yb³⁺之间的能量转移系数C_bi(i=0, 1,3).结果表明，随着PbO加入，Yb³⁺:²F_5/2与Tm³⁺:³H₄间的能量转移不断增加，上转换蓝光的发光强度明显增强.关键词：碲酸盐玻璃上转换发光能量传递速率方程

Energy transfer and upconversion luminescence of Tm3+/Yb3+ co-doped lanthanum-zinc-lead-tellurite glasses

Tm³⁺/Yb³⁺ codoped lanthanum-zinc-lead-tellurite glasses were prepared. Infrared spectrum and upconversion luminescence spectra under 980 nm excitation were studied, and the upconversion luminescence mechanisms were discussed. Rate equations based on energy levels of Tm³⁺ and Yb³⁺ and the upconversion mechanisms were developed, and population density in different levels and coefficients of the energy transfer rate C_bi(i=0, 1,3) between Tm³⁺ and Yb³⁺ were obtained. The results indicated that, with increasing PbO content in the glass, the energy transfer between Yb³⁺:²F_5/2 and Tm³⁺:³H₄ was intensified, and upconversion luminescence intensity of blue emission was enhanced significantly.