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Denis, G., Deniard, P., Rocquefelte, X., Benabdesselam, M. & Jobic, S. (2010) The thermally connected traps model applied to the thermoluminescence of Eu2+ doped Ba13-xAl22-2xSi10+2xO66 materials (x similar to 0.6). Opt. Mater. 32 941–945.
Added by: Laurent Cournède (2016-03-10 21:37:32) |
| Type de référence: Article DOI: 10.1016/j.optmat.2010.01.029 Numéro d'identification (ISBN etc.): 0925-3467 Clé BibTeX: Denis2010 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: Aluminosilicate, crystals, dy3+, europium, long phosphorescence, Luminescence, mechanism, Phosphorescence, Thermoluminescence, Trap Créateurs: Benabdesselam, Deniard, Denis, Jobic, Rocquefelte Collection: Opt. Mater. |
Consultations : 1/562
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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The thermoluminescence (TL) properties of the Eu2+ doped Ba13-xAl22-2xSi10+2xO66 (x similar to 0.6) phosphorescent materials (hereafter labeled BASO:Eu) are analyzed on the basis of the thermally connected traps (TCT) model. Basically, in these materials, Eu2+ cations are photo-ionized under UV excitation, and electrons are trapped at defects. The return to the ground state is thermo-stimulated, and the freed electrons recombine at photo-oxidized activator sites with emission of light. TL properties between 80 and 650 K. as well as an isothermal emission decay (IED) at room temperature, were collected for BASO:Eu1\% and BASO:Eu0.5\% samples to characterize the phosphorescence mechanism in this series of materials and to determine the trap depths. Thermoluminescence glow curves of BASO:Eu excited either at 254 nm or at 365 nm, or excited at 254 nm for durations of 10 s and 240 s, as well as the IED, agree well with a TCT model. Based on our analysis, phosphorescence in BASO:Eu compounds is associated with the depletion of five traps with depths of 0.56, 0.61, 0.65, 0.69 and 0.73 eV. (C) 2010 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |