Er^(3+)/Tm^(3+)共掺碲酸盐玻璃光谱特性及能量传递  

Luminescence and Mechanism of Energy Transfer of Er^(3+)/Tm^(3+)-codoped Tellurite Glass

作　　者：张鹏君[1] 戴世勋[1] 王艳玲[1] 徐铁峰[1] 聂秋华[1] 王训四[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《发光学报》2009年第6期744-749,共6页Chinese Journal of Luminescence

基　　金：浙江省科技厅重点攻关项目(2006C21082)资助

摘　　要：采用高温熔融法制备了两系列不同掺杂比的Er3+/Tm3+共掺的碲酸盐玻璃,测试了样品的吸收光谱和在980nmLD激发下的发光光谱、上转换发光光谱及发光寿命。讨论了Er3+与Tm3+掺杂浓度对样品光谱性质的影响,Tm3+离子的掺入会减弱Er3+的1.53μm发光强度,但通过共振能量传递可以获得Tm3+的1.8μm发光,并随着Tm3+离子浓度的增加而增强。同时表明Tm3+离子的增加会减弱Er3+离子在528nm和545nm附近的上转换绿光强度,而上转换红光出现了先增强后减弱的现象。研究了Er3+/Tm3+共掺杂碲酸盐玻璃的能量传递机制与传递效率,分析了Tm3+/Er3+离子掺杂浓度比对上转换发光的影响。The Er^3＋/Tm^3＋ -codoped tellurite glasses were prepared by high-temperature melting. The absorption spectra, fluorescence spectra, upconversion emission, and the fluorescence lifetime of samples were investigated under 980 nm LD excitation. Spectral properties of the samples with different concentration of Er^3＋ -Tm^3＋ ions were analyzed, the 1.53 μm fluorescence intensity of Er^3＋ reduces with increasing Tm^3＋ -ions concentration, but the 1.8 mm emission of Tm^3＋ increases. The Tm^3＋- ^3H6→^3F4 absorption cross-section and Er^3 ＋ →^4 I13/2→^4 I15/2 emission cross-section were calculated based on Dexter theory, the energy transfer process from Er^3＋ -^4I13/2 level to Tm^3＋ -^3F4 level can occur. The measured lifetimes of Er^3＋ -^4I13/2 level was decreased from 2.05 ms to 0.8 ms with increasing the mol fraction of Tm2O3 from 0.1% to 0.5% where Er2O3 mol fraction is fixed at 0.5%, while the energy transfer rate, at first, from Er^3＋ to Tm^3＋ increases rapidly and then tardily does.The upconversion luminescence of Er^3＋ and Er^3＋/Tm^3＋ ions doped tellurite glasses was investigated. The green light of 530 nm and 545 nm, and the red light of 657 nm can be observed in Er^3＋ doped tellurite glass, moreover the 545 nm light intensity is stronger than the 530 nm light. But the green upconversion emission intensity decreases with Tm^3＋-ions doping, otherwise the red upconversion emission intensity increases firstly and then decreases with increasing Tm^3＋ -ions concentration. In addition, the intensity of red light is strongest when the Tm^3＋/Er^3＋ concentration ratio is 1/5 approximately.

关 键 词：Er3+/Tm3+共掺杂 碲酸盐玻璃 光谱性质 能量传递 

分 类 号：O482.31[理学—固体物理]