掺Tm~(3+)和Tm~(3+)/Ho~(3+)共掺碲钨酸盐玻璃中能量转换过程和机理

本文研究了808nm激光二极管抽运下掺Tm3+和Tm3+/Ho3+共掺碲酸盐玻璃的能量转换过程和机理.利用Dexter模型计算了能量转换微观参数和临界半径,分析了两者的变化特性;利用Vila等修正的Inokuti-Hirayama模型拟合了Tm3+的荧光衰减曲线.结果表明:Tm3+/Ho3+共掺碲酸盐玻璃的能量转换过程中,不仅包含Inokuti-Hirayama作用方式,而且存在着局域性相互作用,并随着Tm3+和Ho3+的浓度增大,后者所占比例逐渐增大.

Energy transfer processes and mechanisms in Tm~(3+) singly doped and Tm~(3+)/Ho~(3+) codoped tellurite glass

Energy transfer processes of Tm³⁺ singly doped and Tm³⁺/Ho³⁺-codoped TeO₂-WO₃-ZnO glass have been investigated under excitation of 808 nm diode laser and the involved mechanisms are discussed. The microscopic parameters and critical radii are calculated by using Dexter model and their characteristics are analyzed. The Inokuti-Hirayama model improved by Vila et al. is utilized to fit the fluorescence decay curves of Tm³⁺. The results indicate that there are not only Inokuti-Hirayama-type solution but also localized interaction solution in the energy transfer processes of Tm³⁺ and Ho³⁺. Furthermore, the contribution of the localized interaction increases with the increasing of the concentrations of Tm³⁺ and Ho³⁺.