Otro
Photoluminescent behavior of BaWO4 powders processed in microwave-hydrothermal
Registro en:
Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 474, n. 1-2, p. 195-200, 2009.
0925-8388
10.1016/j.jallcom.2008.06.049
WOS:000266952000042
Autor
Cavalcante, L. S.
Sczancoski, J. C.
Espinosa, J. W. M.
Varela, José Arana
Pizani, P. S.
Longo, Elson
Resumen
Photoluminescence (PL) at room temperature was observed in BaWO4 powders processed in microwave-hydrothermal at 140 degrees C for different times. The phases were characterized by X-ray diffraction (XRD) and Fourier transform Raman (FT-Raman) measurements. XRD and FT-Raman analyses revealed that the BaWO4 powders present a tetragonal structure and free of deleterious phases. Ultraviolet-visible absorption spectroscopy was employed to determine the optical band gap of this material. PL measurements at room temperature showed a maximum emission at around 543 nm (green emission) when excited with 488 nm wavelength. PL behavior was attributed to the existence of distortions on the [WO4] tetrahedron groups caused by microwave radiation. (C) 2008 Elsevier B.V. All rights reserved. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)