Photoluminescence and energy transfer of Tm3+ doped LiIn (WO4)2 blue phosphors
Identifieur interne : 000042 ( Hal/Checkpoint ); précédent : 000041; suivant : 000043Photoluminescence and energy transfer of Tm3+ doped LiIn (WO4)2 blue phosphors
Auteurs : L. Guerbous [Algérie] ; M. Derbal [Algérie] ; Jean-Pierre Chaminade [France]Source :
- Journal of Luminescence [ 0022-2313 ] ; 2010.
English descriptors
Abstract
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.
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DOI: 10.1016/j.jlumin.2010.08.014
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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.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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