Effects of GeO2 on the thermal stability and optical properties of Er/Yb-codoped oxyfluoride tellurite glasses |
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| Authors: | Yan Zhang Chunhua Lu Yijun Feng Liyan Sun Yaru Ni Zhongzi Xu |
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| Affiliation: | 1. Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China;2. State Key Laboratory of Materials-Orient Chemical Engineering, College of Material Science and Engineering, Nanjing University of Technology, Nanjing, 210009, China |
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| Abstract: | The aim of this article was to study the influence of GeO2 on the thermal stability and optical properties of Er3+/Yb3+ codoped (70 − x)TeO2–xGeO2–PbF2–BaF2 (TGEYx) glasses prepared by using a melting method. The properties of Er3+/Yb3+ codoped glasses were investigated by using differential scanning calorimetry, upconversion luminescence, Raman and optical absorption spectra. The results indicated that TGEY35 glass with the germanate–tellurite mixed network showed the best thermal stability and poor crystallization tendency. With increasing the GeO2 content, the maximum phonon energy of oxyfluoride tellurite glass network increased, while the phonon density decreased. The upconversion emission intensities enhanced obviously based on the decreasing phonon density of glass hosts, while the increasing red emission (657 nm) with the increase of GeO2 concentration was attributed to the relative larger maximum phonon energy which matching the energy gap between the pertinent 4S3/2 and 4F9/2 levels. |
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| Keywords: | A. Glasses C. Differential scanning calorimetry C. Raman spectroscopy and scattering D. Luminescence |
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