Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α-Bi2O3 Needles
| Autor: | Sergio Mazurek Tebcherani, José Arana Varela, Diogo P. Volanti, Thiago Sequinel, Samara Schmidt, Vinícius D.N. Bezzon, Evaldo Toniolo Kubaski, Armando Beltrán |
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| Rok vydání: | 2015 |
| Předmět: |
Photoluminescence
Chemistry Bismuth(III) oxide Analytical chemistry Oxide chemistry.chemical_element Nanotechnology Emission intensity Bismuth Inorganic Chemistry chemistry.chemical_compound symbols.namesake X-ray photoelectron spectroscopy [BiO6]-[BiO6] clusters photoluminescent properties symbols Physical and Theoretical Chemistry Raman spectroscopy Monoclinic crystal system |
| Zdroj: | Repositori Universitat Jaume I Universitat Jaume I |
| ISSN: | 1520-510X 2007-0004 |
| Popis: | 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). This research was funded by The State of Sao Paulo Research Foundation (FAPESP), Research Award No. CEPID 2013/07296-2. Author S. Schmidt is grateful to the Coordination for the Improvement of Higher Education Personnel (Capes) for her doctoral scholarship. This work was also supported by Spanish MALTA-Consolider Ingenio 2010 Program (Project CSD2007-00045). The authors are also grateful to Prof. Juan Andrés for his collaboration in the preparation of this article. |
| Databáze: | OpenAIRE |
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