【摘要】 研究了掺Er3+硅酸盐玻璃的吸收光谱和上转换光谱,应用Judd-Ofelt理论计算了Er3+强度参数Ωλ(λ=2、4、6)、跃迁振子强度、自发辐射几率、荧光分支比．上转换光谱分析表明:在522、545、658nm处有较强的绿光和红光,分别对应于3H11／2→4I15／2、4S3／2→4I15／2、4F9／2→4I15／2的跃迁,发光曲线拟合斜率分别为1．67,1．94,1．76;上转换发光机制主要是激发态吸收和能量转换,且均为双光子吸收过程．更多还原

【Abstract】 Absorption spectra and up-conversion emission spectra of Er3+-doped silicate glasses were investigated. The intensity parametersΩλ(λ=2,4,6), the oscillator strength, the spontaneous transition probabilities and the fluorescence branching ratios were calculated by the theory of Judd-Ofelt. The up-conversion emission spectra show there are stronger green light and red light centered about 522nm, 545nm and 658nm, corresponding to the transition of 2H11/2→4I15/2,4S3/2→4I15/2,4F9/2→4I15/2, and the slope of fitted lines is 1.76, 1.94, 1.67, respectively, which indicates a two-photon process for the green and red light. The up-conversion mechanisms are determined to be excited state absorption and energy transfer.更多还原