Effect of TeO2 on Near‐Infrared Emission from Bismuth Centers in Borogermanate Glasses |
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| Authors: | Zhou‐Su Xu Cheng Xu Qiang‐Bing guo Xiao‐Feng Liu Jian‐Rong Qiu |
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| Affiliation: | 1. School of Materials Science and Engineering, Zhejiang University, Hangzhou, China;2. Institute of Intelligent Optoelectronic Technology, Zhejiang University of Technology, Hangzhou, China |
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| Abstract: | Bi‐doped xTeO2–(60?x)GeO2–15B2O3–20MgO–5Al2O3 glasses were prepared by the conventional melt‐quenching method and their absorption and fluorescence spectra were characterized. Broadband near‐infrared (NIR) emission from Bi centers centered around 1240 nm with a full width at half maximum (FWHM) of 250 nm was observed, and the position of the emission peak strongly depends on the excitation wavelength. Increasing TeO2 concentration results in the strong coloration of the glass, leading to the reduction and finally, complete quenching of the NIR emission. Based on Raman, X‐ray photoelectron spectroscopy and transmission microscopy observation, the coloration of the glass at high TeO2 concentration can be ascribed to the precipitation of elemental Te nanoparticles of around 3–8 nm, which effectively suppresses the NIR emission by reabsorption. The precipitation of Te nanoparticles in an oxide glass may find novel applications in photonics and relevant fields. |
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