用熔融急冷法制备了掺Er3+的80GeS2-10In2S3-10CsI(mol%)硫卤玻璃样品,研究了该样品的吸收光谱和上转换光谱,分析了Er3+离子在该玻璃中的上转换发光机理。应用Judd-Ofelt理论计算分析了Er3+离子在该样品中的强度参数Ωt(t=2,4,6)、自发辐射跃迁几率A、荧光分支比β等光谱参数。在980nmLD泵浦激发下,首次在该种玻璃中观察到强烈的绿光(527nm、548nm),分别对应于4H11/2→4I15/2和4S3/2→4I15/2的跃迁,且548nm绿光强度大于527nm绿光强度。同时研究了绿光(527nm、548nm)上转换发光强度随泵浦激发功率的变化,其发光曲线拟合斜率分别为1.90和2.06,表明绿光是双光子吸收过程。研究结果表明:掺Er3+含铟(In)硫系玻璃有望应用于可见光激光器、高密度光储存、三维色彩显示等领域。
A sample of Er3+-doped 80GeS2-10In2S3-10CsI(mol%)chalcohalide glass was fabricated by the melt-quench method. Absorption spectra and upconversion emission spectra of the glass were investigated,and upconversion mechanisms of Er3+in the glass were analyzed. The intensity parameters Ωt(t=2,4,6),the oscillator strengths,the spontaneous transition probabilities and fluorescence branching ratios were calculated by the theory of Judd-Ofelt. Under 980 nm diode laser excitation,Intense green emissions centered at 527 nm and 548 nm,corresponding to the transitions of H11/2→4I15/2 and 4S3/2→4I15/2,respectively,were observed for the first time in this glass. The upconversion emission intensity varies with the power of infared excitation intensity. A plot of logI vs logP yields two fitted lines with slope 1.90 and 2.06,respectively,which indicates a two-photon process for the green emission. The results suggest the In-based chalcohalide glass containing Er3+ ions is expected to find applications in visible lasers,high density optical storage and three-dimensional color displays.