Investigation on Crystallization and Optical Properties of Ca1−xLaxF2+x Glass‐Ceramics |
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| Authors: | Mohammad H. Imanieh Inocencio R. Martín Bijan Eftekhari Yekta Javier Gonzalez‐Platas Alberto Hernández Creus |
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| Affiliation: | 1. Department of Chemical and Environmental Engineering, University of Toledo, , Toledo, OH, 43607;2. Department of Materials, Ceramic Division, Iran University of Science and Technology, , Narmak, Tehran, 1684613114 Iran;3. Dpto. Física Fundamental y Experimental, Electrónica y Sistemas, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez, , La Laguna, Tenerife, 38206 Spain;4. MALTA Consolider Team, Instituto de materiales y Nanotecnología (IMN), , La Laguna, Tenerife, 38206 Spain;5. Departamento de Física Fundamental II, Servicio Integrado de Difracción de Rayos X, , La Laguna, Tenerife, Spain;6. Departamento de Química Física, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, , La Laguna, Tenerife, 38205 Spain |
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| Abstract: | Transparent oxyfluoride glass‐ceramics containing Er3+, Yb3+:Ca1?xLaxF2+x nanocrystals, which may have potential applications in the fields of solid‐state laser and luminescence, were prepared. Crystallization of Ca1?xLaxF2+x and behavior of Yb3+ and Er3+ during the heat treatment was investigated. Results showed that alumina content had a significant effect on crystallization of Ca1?xLaxF2+x in the SiO2–Al2O3–CaF2–LaF3 system. Due to the size of phase‐separated areas, the size of the crystals during the heat treatment did not change significantly. After crystallization of Ca1?xLaxF2+x in the glass, the majority of Er3+ ions incorporated into the Ca1?xLaxF2+x crystals during the heat‐treatment process. Time‐resolved luminescence of Er3+ ions in the samples around 842 nm showed that the solubility of Er3+ ions in Ca1?xLaxF3 crystals is higher than pure CaF2 crystals. The glass undergoes an enormous phase separation, which keeps the Yb3+ ions within the other separated phase. Therefore, only at high temperatures (790°C) or with a long heat‐treatment time (72 h), there is a possibility for Yb3+ ions to be incorporated into the fluorine phase. |
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