Spectroscopy properties and energy level location of Gd(2)O(2)S:Pr(3+),Ce(3+)
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2009-01-01
Autores
Cebim, Marco Aurelio [UNESP]
Da Silva, Alison Abreu [UNESP]
Davolos, Marian Rosaly [UNESP]
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Wiley-v C H Verlag Gmbh
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In this work we propose the study of the spectroscopy properties and the energy level location of Ce(3+) and Pr(3+) in Gd(2)O(2)S, along with the effects of Ce(4+) (Ce(2)O(2)S(2)) incorporation in Gd(2)O(2)S and Gd(2)O(2)S: Pr(3+) in order to understand the formation and position of the associated defects energy levels in relation to the band structure of Gd(2)O(2)S and Pr(3+) energy levels. Ce-, Pr(3+)-doped and Pr(3+), Ce-doped Gd(2)O(2)S were prepared by the sulfidization of a basic gadolinium carbonate with S(8) using H(2)/N(2) (3.0/97.0%) and air during the firing of the precursor. Samples were analyzed by X-ray diffraction in order to guarantee the formation of the Gd(2)O(2)S single phase. Diffuse reflectance spectroscopy and luminescent measurements (emission/excitation) were used to locate Ce(3+), Pr(3+) and defects energy levels in relation to the band structure of Gd(2)O(2)S. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Physica Status Solidi C: Current Topics In Solid State Physics, Vol 6, Suppl 1. Weinheim: Wiley-v C H Verlag Gmbh, v. 6, p. S171-S174, 2009.