New solid solution ceramics LixY1-yEuy(VO4)1-xF4x (0 <x≤ 0.1; 0 <y≤ 0.2): Synthesis, structural characterization and luminescence properties - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2020

New solid solution ceramics LixY1-yEuy(VO4)1-xF4x (0

Wahida Ltaief
  • Fonction : Auteur
Aïcha Mbarek
Houcine Naïli
  • Fonction : Auteur

Résumé

New solid solutions, LixY(VO4)1-xF4x (0 ​< ​x ​≤ ​0.1), were successfully prepared via solid state reaction method by combination of orthovanadate YVO4 (Zircon structure) and LiYF4 fluoride (Scheelite structure). The structures were determined by X-ray diffraction and profil-matching refinements. Solid state nuclear magnetic resonance, Fourier transforms infrared and Raman spectroscopies with scanning electron microscopy were used to describe the microstructure and chemical composition of the as-prepared ceramics. It was found that solid solutions in the range 0 ​< ​x ​≤ ​0.1 are structurally similar to the zircon structure of YVO4. The luminescence properties of Eu3+ doped samples were investigated. Under excitation of 398 ​nm, the LixY1-yEuy(VO4)1-xF4x (x ​= ​0.05, 0.07, 0.1; y ​= ​0.05, 0.10, 0.15, 0.20) solid solution exhibited red emission originating from the strongest 5D0→7F2 transition. As the amount of Li+ and F− contents increases, the photoluminescence efficiency improved. So, the solid solution ceramics can be considered promising red phosphors for light-emitting diodes.

Domaines

Chimie
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Dates et versions

hal-03113664 , version 1 (18-01-2021)

Identifiants

Citer

Wahida Ltaief, Aïcha Mbarek, Malika El-Ghozzi, Houcine Naïli, Daniel Zambon. New solid solution ceramics LixY1-yEuy(VO4)1-xF4x (0 Journal of Solid State Chemistry, 2020, 284, pp.121223. ⟨10.1016/j.jssc.2020.121223⟩. ⟨hal-03113664⟩
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