Writers: Poliana Lima Rocha and Diego Augusto Batista Barbosa and José Renato de Oliveira Lima and Gilza Maria Piedade Prazeres and Carlos William de Araujo Paschoal and Maximo Siu Li and Elson Longo and Adeilton Pereira Maciel and Marcio Aurélio Pinheiro Almeida
Keywords: Bismuth tungstate; Structural change; Photoluminescence
Abstract: Bi2WO6 (BWO) powders synthesized via hydrothermal processes were studied in order to determine the effect of structure on photoluminescence (PL). BWO samples were characterized using X-Ray Powder Diffraction, UV–vis diffuse reflectance, field emission scanning electron microscopy, and PL intensity measurements. Orthorhombic structures were observed in all samples. A change in crystal microstructure and optical band gap was observed. The PL intensity obtained with different samples varied, with the highest intensity obtained with BWO fabricated with polyvinylpyrrolidone (PVP). Using Raman spectroscopy, a change in the microcrystal symmetry from P21ab to B2cb was observed and found to be responsible for the increase in photoluminescence.
