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- W2016453877 abstract "On prépare de nouveaux antimoniates de terres rares de formule générale Y2BSbO7(B = Ga, Lu, Y). L'analyse des spectres d'excitation et de fluorescence de l'ion Eu3+, introduit dans ces réseaux, révèle la présence de deux centres luminogènes (aux sites Y et B). La symétrie de ces sites ne peut être D3d comme c'est le cas dans la structure pyrochlore. On décrit les propriétés de photoluminescence de l'ion Bi3+ dans ces composés. Les spectres sont attribués aux transitions 1S0 ⇋ 3P1 perturbés par le niveau métastable 3P0. La présence des deux sites permet d'expliquer la décomposition des déclins en deux exponentielles, l'ion Bi3+ pouvant, comme l'europium, se substituer aux cations Y et B. New rare-earth antimonates Y2BSbO7(B = Ga, Lu, Y) have been prepared. Excitation and emission spectra of these host lattices doped with Eu3+ reveal two symmetry sites for Eu3+ (Y and B sites). The symmetry of these sites is not D3d as in the pyrochlore structure. The photoluminescence of the Bi3+ ion is analysed in these compounds. The spectra are ascribed to the 31S0 → 3P1 and 3P1 → 1S0 transitions with a perturbation due to the 3P0 metastable level. The decay curve consists of two exponentials in agreement with the presence of Bi3+ in two symmetry sites." @default.
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- W2016453877 date "1974-06-01" @default.
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- W2016453877 title "Préparation, sites de symétrie et photoluminescence de l'ion Bi3+ dans les antimoniates de terres rares Y2BSbO7 (B = Ga, Lu, Y)" @default.
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- W2016453877 doi "https://doi.org/10.1016/0022-4596(74)90023-1" @default.
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