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2021
ACL
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M.Salaün, A.D.Sontakke, V.Maurel, J.M.Mouesca, A.L.Barra, V.F.Guimaraes, V.Montouillout, B.Viana, I.Gautier Luneau, A.Ibanez, 'Relation between material structure and photoluminescence properties in Yttrium–aluminum borates phosphors', Mater. Research Bull. 47 (2021) doi:10.1557/s43577-021-00195-0
Glassy yttrium and aluminum borate powders (g-YAB) were synthesized by the polymer 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 (7 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 were replaced during the calcination process by hydroxyl groups, or other oxygen-containing groups.
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