Investigation on Crystallization and Optical Properties of Ca1−xLaxF2+x Glass-Ceramics

Authors

  • Mohammad H. Imanieh,

    Corresponding author
    1. Department of Chemical and Environmental Engineering, University of Toledo, Toledo, OH
    2. Department of Materials, Ceramic Division, Iran University of Science and Technology, Narmak, Tehran, Iran
    Search for more papers by this author
  • Inocencio R. Martín,

    1. Dpto. Física Fundamental y Experimental, Electrónica y Sistemas, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez, La Laguna, Tenerife, Spain
    2. MALTA Consolider Team, Instituto de materiales y Nanotecnología (IMN), La Laguna, Tenerife, Spain
    Search for more papers by this author
  • Bijan Eftekhari Yekta,

    1. Department of Materials, Ceramic Division, Iran University of Science and Technology, Narmak, Tehran, Iran
    Search for more papers by this author
  • Javier Gonzalez-Platas,

    1. Departamento de Física Fundamental II, Servicio Integrado de Difracción de Rayos X, La Laguna, Tenerife, Spain
    Search for more papers by this author
  • Alberto Hernández Creus

    1. Departamento de Química Física, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, La Laguna, Tenerife, Spain
    Search for more papers by this author

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 SiO2Al2O3CaF2LaF3 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.

Ancillary