Tm3+/Yb3+共掺铋碲酸盐玻璃中的高效蓝色上转换荧光

制备了高折射率Tm³⁺/Yb³⁺共掺杂铋碲酸盐玻璃，利用棱镜耦合法测量出玻璃在632.8和1550nm波长处的折射率分别为2.0365和1.9795. 对玻璃的吸收、荧光和红外透过光谱展开了测试与分析，根据Judd-Ofelt理论对吸收光谱进行拟合，求得Tm³⁺的振子强度参数Ω_t(t=2，4，6)分别为3.90×10^-20, 2.03×10^-20和9.03×10^{-2关键词：3+}/Yb³⁺共掺')" href="#">Tm³⁺/Yb³⁺共掺铋碲酸盐玻璃光谱参数上转换荧光

Intense blue upconversion fluorescence of Tm3+/Yb3+-codoped bismuth tellurite glasses

In this paper, Tm³⁺/Yb³⁺-codoped bismuth tellurite glasses with high refractive index have been synthesized. The refractive index of Tm³⁺/Yb³⁺-codoped bismuth tellurite glasses were measured by Metricon 2010 prism coupler at two wavelengths, and the values n₁=2.0365 at 632.8nm and n₂=1.9795 at 1550nm were obtained. The absorption spectra, fluorescence spectra and infrared transmittance spectra of this glass were measured and analyzed. Based on Judd-Ofelt theory, and intensity parameters Ω_t(t=2，4 and 6) were obtained to be 3.90×10^-20, 2.03×10^-20 and 9.03×10^-21cm², respectively. Then the radiative transition probabilities, radiative lifetimes and fluorescence branching ratio were calculated. Intense blue three-photon upconversion fluorescence and near-infrared two-photon upconversion fluorescence were investigated under the excitation of 980nm diode laser at room temperature. Wide infrared transmission window, high refractive index and strong blue three-photon upconversion emission of Tm³⁺ indicate that Tm³⁺/Yb³⁺-codoped LKBBT glasses are promising upconversion optical and laser materials.