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Article Dans Une Revue MRS Bulletin Année : 2022

Relation between material structure and photoluminescence properties in yttrium–aluminum borates phosphors

Résumé

Glassy yttrium and aluminum borate powders (g-YAB) were synthesized by the polymeric precursor method (modified Pechini). We report here a detailed study of the structural, spectroscopic, and optical characterizations of the g-YAB powders, involving several complementary techniques: thermal analysis, X-ray powder diffraction, and electron microscopy combined with IR, nuclear magnetic resonance, and electron paramagnetic resonance spectroscopies. All these results, directly correlated with the photoluminescence (PL) properties of the g-YAB phosphors, allow us to argue that the PL emissions come from large polyaromatic molecules auto-generated from organic precursors and trapped in the glassy network of the g-YAB during thermal treatments. These extended aromatic molecules (seven rings and more corresponding to polycyclic aromatic hydrocarbons) must have been produced during the pyrolysis treatment of the powders, in which a large fraction of the protons was replaced during the calcination process by hydroxyl groups, or other oxygen-containing groups.

Domaines

Chimie
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Dates et versions

hal-03594949 , version 1 (18-10-2022)

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Mathieu Salaun, A Sontakke, V Maurel, J Mouesca, A Barra, et al.. Relation between material structure and photoluminescence properties in yttrium–aluminum borates phosphors. MRS Bulletin, 2022, 47, pp.231-242. ⟨10.1557/s43577-021-00195-0⟩. ⟨hal-03594949⟩
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