Luminescence properties of lanthanide-containing layered double hydroxides
authors Vicente, P; Perez-Bernal, ME; Ruano-Casero, RJ; Ananias, D; Paz, PAA; Rocha, J; Rives, V
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords Layered double hydroxides; Mixed oxides; Lanthanide; Luminescence
keywords HYDROTALCITE-LIKE COMPOUNDS; PHYSICOCHEMICAL PROPERTIES; CONTROLLED-RELEASE; PHOSPHORS; IONS; ADSORPTION; MG; CALCINATION; COMPOUND; YTTRIUM
abstract 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.
publisher ELSEVIER SCIENCE BV
issn 1387-1811
year published 2016
volume 226
beginning page 209
ending page 220
digital object identifier (doi) 10.1016/j.micromeso.2015.12.036
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000373419400026
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