Energy transfer induced Eu3+ photoluminescence enhancement in tellurite glass |
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Authors: | W. Stambouli H. Elhouichet B. Gelloz M. Férid N. Koshida |
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Affiliation: | 1. Laboratoire des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, B.P. 95, Hammam-Lif 2050, Tunisia;2. Département de Physique, Faculté des Sciences de Tunis, Université de Tunis—ElManar ElManar 2092, Tunis, Tunisia;3. Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, 184-8588 Tokyo, Japan |
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Abstract: | In this work, structural, thermal and optical properties of Eu3+ doped TeO2–La2O3–TiO2 glass were investigated. The differential scanning calorimetry (DSC) measurements reveal an important stability factor ΔT=143.52 K, which indicates the good thermal and mechanical stabilities of tellurite glass. From the absorption spectrum, the optical band gap was found to be direct with Eg=3.23 eV. The temperature dependences of photoluminescence (PL) properties of Eu-doped and Eu–Tb codoped tellurite glass are investigated. As the temperature increases from 7 to 300 K, both the PL intensity and the PL lifetime relative to the 5D2→7F0 are nearly constant below 230 K and then an enhancement takes place. This anomalous feature is attributed to the thermally activated carrier transfer process from charged intrinsic defects states to Eu3+ energy levels.By co-doping tellurite glasses with Eu and Tb, a strong Eu3+ PL enhancement is shown due to excitation transfer from Tb3+ and intrinsic defects to Eu ions. |
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