Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α‑Bi2O3 Needles
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 in...
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| Veröffentlicht in: | Inorganic chemistry 2015-11, Vol.54 (21), p.10184-10191 |
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| container_issue | 21 |
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| container_title | Inorganic chemistry |
| container_volume | 54 |
| creator | Schmidt, Samara Kubaski, Evaldo T Volanti, Diogo P Sequinel, Thiago Bezzon, Vinicius Danilo N Beltrán, Armando Tebcherani, Sergio M Varela, José A |
| description | 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 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). |
| doi_str_mv | 10.1021/acs.inorgchem.5b01237 |
| format | Article |
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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. 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| source | ACS Publications |
| title | Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of α‑Bi2O3 Needles |
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