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

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

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 of Tm^3＋ singly doped and Tm^3＋/Ho^3＋-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 Tm^3＋. The results indicate that there are not only Inokuti-Hirayama-type solution but also localized interaction solution in the energy transfer processes of Tm^3＋ and Ho^3＋. Furthermore, the contribution of the localized interaction increases with the increasing of the concentrations of Tm^3＋ and Ho^3＋.