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- W2034393251 abstract "La fluorescence de l'ion Eu3+ est étudiée dans les composés LiNaY2 − x-EuxF8 à 300 K et 77 K après excitation sélective dans les niveaux 5D0 ou 5L6 de cet ion. Des modèles théoriques sont proposés permettant ainsi d'ajuster les déclins des fluorescences issues des niveaux 5DJ (J = 0, 1, 2). En ce qui concerne les niveaux 5D2 et 5D1 ces modèles tiennent compte de concentrations critiques C0. Lorsque CEu3+ ⩽ C0 on observe uniquement des relaxations non radiatives intracentre par multiphonons; lorsque CEu3+ >C0, il y a de plus possibilité de transfert à longue portée par interaction dipolaire électrique intercentre. The fluorescence of the Eu3+ ion is investigated in the LiNaY2 − xEuxF8 compounds at both 300 K and 77 K upon selective excitation into the 5D0 or 5L6 levels of this ion. Theoretical models are proposed for fitting the fluorescence decays from the 5DJ levels (J = 0, 1, 2). These models take account of the critical concentrations below which only non-radiative intracentre, multiphonons, relaxation is observed and above which there is, in addition, the possibility of long-range transfer by dipolar electric intercentre interaction." @default.
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- W2034393251 date "1988-10-01" @default.
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- W2034393251 title "Fluorescence et dynamique dans LiNaY2F8:Eu3+" @default.
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- W2034393251 doi "https://doi.org/10.1016/0022-5088(88)90057-4" @default.
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