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High temperature annealing of micrometric Zn2SiO4:Mn phosphor powders in fluidized bed

Alavi, Shila and Dexpert-Ghys, Jeannette and Caussat, Brigitte High temperature annealing of micrometric Zn2SiO4:Mn phosphor powders in fluidized bed. (2008) Materials Research Bulletin, vol. 4 (n° 10). pp. 2751-2762. ISSN 0025-5408

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Official URL: http://dx.doi.org/10.1016/j.materresbull.2007.10.019

Abstract

Micrometric Zn1.8Mn0.2SiO4 phosphor powders prepared by spray pyrolysis have been annealed between 900 and 1200°C under ambient air atmosphere to exalt their luminescence properties. Two original gas-solid fluidization processes have been tested in order to limit sintering phenomena, and the post-treated products have been compared with those annealed using a conventional process in crucible. The crystallinity, the size distribution, the outer morphology and the luminescence properties of powders before and after treatment have been analysed. Massive sintering phenomena occur in crucible from 1000°C, whereas the original granulometry and spherical morphology are preserved till 1100°C in fluidized bed. The luminescence efficiencies are comparable for the three processes and maximal after annealing at 1200°C. It has been established that residual ZnO and manganese ions at oxidation state higher than 2, still present after treatment at 1100°C, are detrimental to good luminescence efficiency. Both disappear from samples post-treated at 1200°C.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Materials Research Bulletin website : http://www.sciencedirect.com/science/journal/00255408
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Hélène Dubernard

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