Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α-Bi2O3 Needles
Scholar | Otros documentos del autor: Schmidt, Samara; Kubaski, Evaldo T.; Volanti, Diogo P.; Sequinel, Thiago; Bezzon, Vinicius Danilo N.; Beltrán Flors, Armando; Tebcherani, Sergio M.; Varela, José A.
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TítuloEffect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α-Bi2O3 Needles
Fecha de publicación2015-10
EditorAmerican Chemical Society
Materials with high photoluminescence (PL) intensity can potentially be used in optical and electronic devices. Although the PL properties of bismuth(III) oxide with a monoclinic crystal structure (α-Bi2O3) have ... [+]
Materials with high photoluminescence (PL) intensity can potentially be used in optical and electronic devices. Although the PL properties of bismuth(III) oxide with a monoclinic crystal structure (α-Bi2O3) have been explored in the past few years, methods of increasing PL emission intensity and information relating PL emission to structural defects are scarce. This research evaluated the effect of a pressure-assisted heat treatment (PAHT) on the PL properties of α-Bi2O3 with a needlelike morphology, which was synthesized via a microwaveassisted hydrothermal (MAH) method. PAHT caused an angular increase between the [BiO6]−[BiO6] clusters of α- Bi2O3, resulting in a significant increase in the PL emission intensity. The Raman and XPS spectra also showed that the α- Bi2O3 PL emissions in the low-energy region (below ∼2.1 eV) are attributed to oxygen vacancies that form defect donor states. The experimental results are in good agreement with first-principles total-energy calculations that were carried out within periodic density functional theory (DFT). [-]
Cita bibliográficaSCHMIDT, Samara, et al. Effect of pressure-assisted heat treatment on photoluminescence emission of α-Bi2O3 needles. Inorganic chemistry, 2015, vol. 54, no 21, p. 10184-10191.
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