GUERBOUS, L.; DERBAL, M.; CHAMINADE, Jean-Pierre

doi:10.1016/j.jlumin.2010.08.014

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GUERBOUS, L.
Laser Department [CRNA]

DERBAL, M.
LASMEA

CHAMINADE, Jean-Pierre
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Luminescence. 2010, vol. 130, n° 12, p. 2469-2475

Elsevier

Résumé en anglais

Room temperature steady and time resolved emission spectra of LiIn1−xTmx(WO4)2 (where thulium concentration is 0, 0.5, 1, 5 and 10 at%) blue phosphors, under UV excitation energy have been investigated. The concentration quenching effect on the blue emission, due to the (WO4)−2 groups and 1G4→3H6 emission transition of Tm3+ were studied. Two energy transfer mechanisms are shown. The first takes place between excited (WO4)−2 groups and the 1G4 energy level of Tm3+, and is mainly analyzed by phonon-assisted energy transfer. The second mechanism is due to an energy transfer from the excited Tm3+ ions to the surrounding ground state Tm3+ ions. The non-exponential decay curves of the 1G4 level observed for higher concentrations are analyzed by the Inokuti–Hirayama model. We think that the quenching effect between Tm3+ ions is mainly linked to the dipole–dipole interactions.< Réduire

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Tm3+

Double tungstate

Photoluminescence

Energy transfer

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Photoluminescence and energy transfer of Tm<sup>3+</sup> doped LiIn (WO<sub>4</sub>)<sub>2</sub> blue phosphors

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