ic5b01237_si_002.cif (0.77 kB)
Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α‑Bi2O3 Needles
dataset
posted on 2015-11-02, 00:00 authored by Samara Schmidt, Evaldo T. Kubaski, Diogo P. Volanti, Thiago Sequinel, Vinicius Danilo N. Bezzon, Armando Beltrán, Sergio M. Tebcherani, José A. VarelaMaterials 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 microwave-assisted 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).