【作者】 夏海平； 林琼斐； 王金浩； 张约品； 杨钢锋； 张勤远；

【Author】 XLA Hai-ping, LIN Qiong-fei, WANG Jin-hao, ZHANG Yue-pin, YANG Gang-feng,ZHANG Qin-yuan ( Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China; Key Lab of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials .South China University of Technology, Guangzhou 510641, China)

【机构】 宁波大学光电子功能材料重点实验室； 华南理工大学光通信材料研究所特种功能材料教育部重点实验室；

【摘要】 用高温熔融法制备了不同Tm3+浓度掺杂的65GeO2-12AlF3-8Li2O-10BaF2-5La2O3-xTm2O3(x=0．5mol％, 1．0 mol％,2．0 mol％,4．0 mol％,6．0 mol％)玻璃。从吸收光谱特性出发,根据Judd_Ofelt理论,计算得到了Tm3+离子的J-O强度参数(Ω2,Ω4,Ω6)及Tm3+离子各激发能级的自发跃迁几率、荧光分支比以及辐射寿命等光谱参量。在808 nm波长的激发下,研究了不同Tm3+掺杂浓度下玻璃在～1．47μm与～1．8μm处的荧光特性,在掺杂浓度约达到1．0 mol％时,在1.8μm处的荧光强度达最大,然后随着掺杂浓度的增大,其荧光强度反而降低。作者从Tm3+的交叉驰豫与浓度猝灭效应解释了这一荧光强度变化的过程。更多还原

【Abstract】 Glasses with the compositions of 65GeO2-12AlF3-8Li2O-10BaF2-5La2O3 doped with different Tm3+ concentration (0.5,1.0,2.0,4.0,6.0 mol% ) were fabricated by conventional melting method. According to the absorption spectra and the Judd-Ofelt theory, the J-O strength parameters(Ω2,Ω4, Ω6) were calculated, by which the radiative transition probabilities, branching ratios and radiative lifetimes were obtained. The infrared emission spectra (with 808nm LD excitation) at -1.47 μm and-1.8 μm of various concentration Tm3+ -doped glasses were studied. The emission intensity at-1.8 μm reaches to the maximum when the Tm3+ -doping concentration is near to be 1.0 mol% and then decreases at higher concentration. The mechanism of the change of the fluorescence intensity was explained from the cross-relaxation effect and the concentration quenching of Tm3+ effect.更多还原