Ce3+对Er3+/Yb3+共掺TeO2-WO3-ZnO玻璃发光性能的影响

在Er³⁺/Yb³⁺共掺TeO₂-WO₃-ZnO玻璃中引入Ce³⁺，研究了Ce³⁺对Er³⁺1.5μm发射性能及其上转换发光性能的影响。结果表明，随Ce³⁺浓度的增加Er³⁺1.5μm波段的荧光强度先增强后降低，优化的Ce³⁺掺杂浓度在2.07×10²⁰/cm³左右；1.5μm波段的荧光寿命则随Ce³⁺浓度的增加有轻微降低，从3.4ms降到3.0ms，但Ce³⁺浓度的增加对1.5μm波段的荧光半高宽基本无影响；Er³⁺/Ce³⁺间的交叉弛豫Er³⁺(⁴I_11/2)+Ce³⁺(²F_5/2)→Er³⁺(⁴I_13/2)+Ce³⁺(²F_7/2)使玻璃的上转换发光强度大大降低，但在过高的Ce³⁺浓度下，Er³⁺/Ce³⁺间的另一交叉弛豫Er³⁺(⁴I_13/2)+Ce³⁺(²F_5/2)→Er³⁺(⁴I_15/2)+Ce³⁺(²F_7/2)则使Er³⁺⁴I_13/2能级粒子数减少，导致1.5μm波段荧光强度和荧光寿命降低. 关键词： 碲钨酸盐玻璃 发光性能 3+离子')" href="#">Er³⁺离子 3+离子')" href="#">Ce³⁺离子 交叉弛豫

Effect of introducing Ce3+ on the emission properties of Er3+/Yb3+-doped TeO2-WO3-ZnO glasses

Ce³⁺ ions were introduced into the Er³⁺/Yb³⁺-codoped TeO₂-WO₃-ZnO glasses, and the effect of Ce³⁺ on the emission properties at 1.5μm band and the upconversion luminescence of Er³⁺ in the glasses was investigated. With the increasing of Ce³⁺ concentration, the emission intensity of Er³⁺ at 1.5μm band increases firstly, and then decreases. The optimal doping concentration of Ce³⁺ is about 2.07×10²⁰/cm³. As for the Er³⁺ emission at 1.5-μm band, the fluorescence lifetime decreases a little from 3.4ms to 3.0ms, while the full width at half maximum (FWHM) hardly changes with the increase of Ce³⁺ concentration. Due to the effective cross relaxation between Ce³⁺ and Er³⁺: Er³⁺(⁴I_11/2)+Ce³⁺(²F_5/2)→Er³⁺(⁴I_13/2)+Ce³⁺(²F_7/2), the upconversion emission intensity of Er³⁺ is reduced greatly. But when Ce³⁺-doping concentration is too high, the other cross relaxation between Ce³⁺ and Er³⁺: Er³⁺(⁴I_13/2)+Ce³⁺(²F_5/2)→Er³⁺(⁴I_15/2)+Ce³⁺(²F_7/2) happens, which depopulates the ⁴I_13/2 level of Er³⁺ and results in the decrease of the emission intensity and fluorescence lifetime of Er³⁺ at 1.5μm band.