The radiative property of Er³⁺/Tm³⁺ co-doping tellurite glass containing metallic silver nanoparticles (Ag NPs) in near-infrared (NIR) band region was studied under the 808 nm pumping. The tellurite glass was prepared by applying melt-quenching and heat-treated technique, and characterized by measuring differential scanning calorimeter (DSC) curve, transmission electron microscopy (TEM) image, absorption spectrum and fluorescence spectrum. Under the optimized combination of Er³⁺ and Tm³⁺ ions, a flat and wide NIR band fluorescence in spectral range of 1350 to 1650 nm with full width at half maximum (FWHM) of 161 nm, originating from Er³⁺:⁴I_13/2→⁴I_15/2 radiative transition (1.53 µm) and Tm³⁺:³H₄→³F₄ radiative transition (1.47 µm), was observed in the studied tellurite glass. The fluorescence intensity was increased by about 91% when the Ag NPs with size of ∼17.4 nm was embedded into the doping glass. A similar wide optical amplification spectrum was also observed through the theoretical simulation of stimulated radiative transition of tellurite glass fiber co-doped with Er³⁺/Tm³⁺ ions, indicating the potential of Er³⁺/Tm³⁺ co-doping tellurite glass applied for broadband fiber amplifiers and tunable lasers. Additionally, the DSC curve revealed the excellent thermal stability of glass host with transition temperature of 381°C and the difference between crystallization onset temperature and transition temperature of 141°C. Some important spectral parameters like radiative transition probability and fluorescence branching ratio among different levels were determined according to Judd-Ofelt theory to better understand the observed broadband and flat NIR luminescence phenomenon.

研究了含金属银纳米粒子（Ag NPs）的Er ³⁺ /Tm ^{3+共掺杂亚碲酸盐玻璃在808 nm泵浦下近红外（NIR）波段区域的辐射特性。}采用熔融淬火和热处理技术制备亚碲酸盐玻璃，并通过测量差示扫描量热仪(DSC)曲线、透射电子显微镜(TEM)图像、吸收光谱和荧光光谱对其进行表征。在 Er ³⁺和 Tm ³⁺离子的优化组合下，光谱范围为 1350 至 1650 nm 的平坦且宽的近红外波段荧光，半峰全宽 (FWHM) 为 161 nm，源自 Er ³⁺ : ⁴ I _13/2 →在所研究的亚碲酸盐玻璃中观察到⁴ I _15/2辐射跃迁 (1.53 µm) 和 Tm ³⁺ : ³ H ₄ → ³ F _{4辐射跃迁 (1.47 µm)。}当尺寸为~17.4 nm的Ag NPs嵌入掺杂玻璃时，荧光强度增加了约91%。通过理论模拟共掺杂Er ³⁺ /Tm ^{3+离子的碲酸盐玻璃纤维的受激辐射跃迁也观察到了类似的宽光放大光谱，表明了Er 3+} /Tm ³⁺的潜力。共掺杂亚碲酸盐玻璃应用于宽带光纤放大器和可调谐激光器。此外，DSC曲线显示玻璃主体具有优异的热稳定性，转变温度为381°C，结晶起始温度与转变温度之间的差异为141°C。根据Judd-Ofelt理论确定了不同能级之间的辐射跃迁概率和荧光分支比等一些重要的光谱参数，以更好地了解观察到的宽带和平坦的近红外发光现象。