Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5447595 | Journal of Physics and Chemistry of Solids | 2017 | 5 Pages |
Abstract
Europium-doped barium aluminate (BaAl2O4:Eu) was successfully produced using an alternative PVA (Polyvinyl Alcohol) assisted sol-gel route at low temperature. To find the best conditions of calcination, DTA/TG (Differential Thermal Analysis/ Thermogravimetric Analysis) techniques were used. X-ray powder diffraction and Rietveld refinement were used to identify the crystalline phases, as well as to confirm the BaAl2O4 phase formation at 600 °C, a much lower temperature than previously reported in the literature. The crystallite size was estimated using the Scherrer's formalism showing that the prepared samples are in the nanometric scale. XANES (X-ray absorption near edge structure) measurements showed that only Eu3+ species are present in the matrix after calcinations. Optical characterization was performed by photoluminescence (PL) and radioluminescence (RL) spectra. PL studies showed exciton emissions and the characteristic Eu3+ spectrum. Samples irradiated by X-ray showed emissions associated to the exciton and Eu3+ and Eu2+ transitions. This study showed that calcination temperature greatly influenced the luminescent properties. The reproducibility of the samples was successfully tested.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Manassés A. Gomes, Adriano B. Andrade, Marcos V. dos S. Rezende, Mário E.G. Valerio,