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Spectroscopies et modélisation de verres de silice dopés d'ions de terre rare - influence du co-dopage

Abstract : This study concerns the role of a co-doping agent on the environment of the rare earth ions in silica glass and its consequences on the spectroscopy of the luminescent element. Two different co-doping agents were studied: aluminium and hafnium ions. The samples of doped and co-doped glasses were obtained by sol-gel process and were studied by different experimental methods: luminescence spectroscopy, FLN spectroscopy, Raman spectroscopy, and EXAFS spectroscopy. In parallel some numerical simulations using molecular dynamics technique were carried out to detail various hypothetical environments. This work highlighted modifications in the rare earth environment by the incorporation of a co-doping agent in a material. These modifications were interpreted as: an increase in the number of non-bridging oxygen improving the rare earth ions solubility in glasses; an increase in the distance between oxygen and the rare-earth ions and a modification of the first neighbours covalence inducing an increase of the crystal field undergone by the luminescent ion; and a reduction of the phonon energy which has for consequence a decrease of luminescence quenching. Molecular dynamics simulations have not revealed a dispersing effect of aluminium on the rare earth clustering. On the other hand, the effect could be clearly observed on the numerical simulations of hafnium-containing glass.
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Submitted on : Wednesday, December 10, 2008 - 11:55:00 AM
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  • HAL Id : tel-00345872, version 1

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Guillaume Alombert-Goget. Spectroscopies et modélisation de verres de silice dopés d'ions de terre rare - influence du co-dopage. Physique [physics]. Université d'Angers, 2007. Français. ⟨tel-00345872⟩

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