Article ID Journal Published Year Pages File Type
5447595 Journal of Physics and Chemistry of Solids 2017 5 Pages PDF
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.
Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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