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Luminescence properties of lanthanide-containing layered double hydroxides

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Resumo:A series of layered double hydroxides with the hydrotalcite structure containing Mg2+ and Al3+ cations in the brucite-like layers and carbonate in the interlayer have been prepared, with different lanthanide cations (4% loading) in the brucite-like layers. The solids have been characterized by element chemical analysis, powder X-ray diffraction, thermal analysis, particle size distribution, FT-IR and UV-Vis spectroscopies and surface texture by adsorption-desorption of nitrogen at - 196 degrees C. The color and luminescent properties have been also studied. The results confirmed the hydrotalcite-type structure, without any sort of contaminating phases. The solids have been calcined at 1000 degrees C forming homogeneously dispersed mixed oxides, where the rock-salt structure of MgO and the MgAl2O4 spinet have been identified by powder X-ray diffraction, without any differentiated phase containing lanthanide ions. The samples (original and calcined) containing Tb3+ exhibited green fluorescence, detected under irradiation of 254 and 365 nm. The emission spectra showed a series of narrow lines ascribed to the Tb3+5D4 -> F-7(6-2) transitions. The decay curves monitored at 543 nm indicated the presence of a single local Tb3+ environment in the parent and calcined samples. For the calcined samples, the photoluminescence evidence supports the insertion of Tb3+ in MgAl2O4 rather than in MgO. (C) 2016 Elsevier Inc. All rights reserved.
Autores principais:Vicente, P.
Outros Autores:Pérez-Bernal, M. E.; Ruano-Casero, R. J.; Ananias, Duarte; Almeida Paz, Filipe A.; Rocha, J.; Rives, V.
Assunto:HYDROTALCITE-LIKE COMPOUNDS PHYSICOCHEMICAL PROPERTIES CONTROLLED-RELEASE PHOSPHORS IONS ADSORPTION MG CALCINATION COMPOUND YTTRIUM
Ano:2016
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Universidade de Aveiro
Idioma:inglês
Origem:RIA - Repositório Institucional da Universidade de Aveiro

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