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Elaboration par procédé sol-gel de fluorures de type ALnF4 (A=Li, Na et Ln=Y, Gd) et de composites SiO2/LiGdF4 dopés par les ions de terres rares pour applications optiques

Abstract : This work is devoted to the development by the sol-gel process of ALnF4 (A=Li, Na and Ln=Y, Gd) fluorides and SiO2/LiGdF4 composites activated by Eu3+ ions. This synthesis process by a soft chemistry route, involving a sol as an intermediary step, enables the achievement of powders and coatings. The use of molecular precursors induces a homogeneous distribution of doping ions into the fluoride matrix avoiding any clustering effect. Several experimental tools (XRD, IR, Raman, EXAFS, NMR, EPR, SEM and TEM) were performed to characterize the structural and morphological properties of samples. On the basis of these results, the synthesis parameters as well as the suitable thermal treatments to obtain pure phases without organic residues were derived. Optical properties of powders were studied upon UV excitation to emphasize the sol-gel process efficiency for producing optical materials of high quality and in the VUV range to evidence the quantum-cutting properties of our materials.
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Submitted on : Monday, July 16, 2012 - 3:12:51 PM
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  • HAL Id : tel-00718258, version 1

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Sophie Lepoutre. Elaboration par procédé sol-gel de fluorures de type ALnF4 (A=Li, Na et Ln=Y, Gd) et de composites SiO2/LiGdF4 dopés par les ions de terres rares pour applications optiques. Chimie théorique et/ou physique. Université Blaise Pascal - Clermont-Ferrand II, 2007. Français. ⟨NNT : 2007CLF21772⟩. ⟨tel-00718258⟩

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