Wang Xunsi

Mid-infrared emission properties of Dy3+ -doped Ge-Ga-S-Csl glasses

A serial of chalcogenide glasses based on Ge-Ga-S-Csl system doped with the different Ho3+ ions were synthesized by melt-quenching technique. The properties of glasses including refractive indexes, absorption spectra, mid-infrared emission spectra and lifetimes of I-5(6) level of Ho3+ ions were measured. The Judd-Ofelt intensity parameters Omega(i)(i=2,4,6), oscillator strength f(cal), spontaneous transition probabilities A(rad) for Ho3+ ion were calculated by Judd-Ofelt theory. Multiphonon relaxation rates of the Ho3+ : I-5(5)-> I-5(6) and I-5(6)-> I-5(7) in Ge-Ga-S-Csl glasses were evaluated. Effect of Ho3+ ion concentration on the fluorescence spectra was investigated. The results indicate that the fluorescence under 900 nm excitation with peak wavelength at 2. 81 mu m and 3. 86 mu m are due to the Ho3+ : I-5(6)-> I-5(6) and I-5(6)-> I-5(7) transition, respectively. The intensity of the mid-infrared fluorescence are enhanced with the Ho3+ ion concentration increasing from 0. 5wt% to 1. 0wt%. Multiphonon relaxation rates are 29s(-1) and 34s(-1) for the Ho3+ : I-5(5)-> I-5(6) and I-5(6)-> I-5(7) transition, respectively.采用熔融冷却法制备了系列不同Ho 3+ 离子掺杂浓度的Ge-Ga-S-CsI玻璃样品，测试了样品的折射率、吸收光谱以及中红外荧光光谱和Ho 3+ 离子5I6能级荧光寿命.应用Judd-Ofelt理论计算了Ho 3+ 离子在该基质玻璃中强度参数 Ω i （ i =2,4,6）、能级跃迁振子强度fcal、自发跃迁几率Arad等光谱参数.计算了Ho 3+ ∶ 5 I 5 → 5 I 6 (3.86μm)和 5 I 6 → 5 I 7 (2.81μm)跃迁的多声子驰豫速率.讨论了中红外荧光特性与Ho 3+ 离子掺杂浓度之间的关系.结果表明，在900nm 激光泵浦下观察到了2.81和3.86μm两处中红外荧光，分别对应于Ho 3+ ∶ 5 I 6 → 5 I 7 和 5 I 5 → 5 I 6 跃迁，当Ho 3+ 离子掺杂浓度从0.5wt%增加到1.0wt%时，两处中红外荧光强度都随相应增加，计算的Ho 3+ ∶ 5 I 5 → 5 I 6 和 5 I 6 → 5 I 7 跃迁多声子驰豫速率分别为29s -1 和34s -1 .

Concentration Quenching in Erbium Doped Bismuth Silicate Glasses

Er2O3-doped bismuth silicate glasses are prepared by the conventional melt-quenching method, and the Er3+:4I13/2 →4I15/2 fluorescence properties are studied for different Er3+ concentrations. Infrared spectra are measured to estimate the exact content of OH- groups in the samples. Based on the electric dipole–dipole interaction theory, the interaction parameter CEr,Er for the migration rate of Er3+:4I13/2→4I13/2 in proposed glasses is calculated.