碘化铅对Dy^(3+)掺杂GeS_2–Ga_2S_3玻璃荧光光谱性质的影响

Effect of PbI_2 Content on Fluorescence Spectra of Dy^(3+)-Doped GeS_2–Ga_2S_3 Chalcohalide Glasses

采用熔融淬冷法制备了掺杂浓度为0.3%(质量分数)的Dy3+:(100–x)(0.8GeS2–0.2Ga2S3)–xPbI2(x=5,10,15,摩尔比)系列硫卤玻璃样品,测试了样品热稳定性、折射率、密度、吸收光谱、近红外及中红外荧光光谱。应用Judd–Ofelt理论计算了Dy3+在系列样品中的强度参数(Ωt,t=2,4,6)、自发辐射跃迁几率、荧光分支比以及辐射寿命等光谱参数。讨论了PbI2含量对样品的吸收光谱、光谱参数以及荧光光谱的影响。在Dy3+掺杂样品中,PbI2含量的增加有效地提高了1 330 nm和2 860 nm处的荧光强度。计算了0.3%Dy3+掺杂68GeS2–17Ga2S3–15PbI2玻璃在1 330 nm和2 860 nm处的受激发射截面值分别为3.63×10–20 cm2和1.57×10–20 cm2,2 860 nm处的量子效率为83.8%。

A serials of 0.3% （mass fraction） Dy^3＋-doped （100-x）（0.8GeS2-0.2Ga2S3）-xPbI2 （x = 5, 10 and 15, mole ratio） chalcohalide glasses were synthesized by a melt-quenching technique. The refractive indexes, densities, absorption spectra, near-and mid-infrared fluorescence of glass samples were measured. The intensity parameters （Ωt,t = 2, 4, 6）, transition probabilities, branching ratios and radiative lifetimes were predicted for Dy^3＋ ions in samples by using the Judd-Ofelt theory. The effect of Pbl2 content on the absorption spectra and fluorescence properties of glasses was investigated. In the Dy^3＋-doped glasses, the increase of PbI2 had a positive effect for 1 330 and 2 860nm fluorescences. The emission cross sections of the 1 330 and 2 860nm fluorescences were estimated to be 3.63 × 10^-20 and 1.57 × 10^-20 cm^2, respectively, for the 0.3% Dy^3＋-doped 68GeS2-17Ga2S3-15PbI2 glass, which had a quantum efficiency of 83.8% at 2 860 nm.