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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Pressure-Assisted Heat Treatment on Photoluminescence Emission of alpha-Bi2O3 Needles

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Schmidt, Samara [1] ; Kubaski, Evaldo T. [2] ; Volanti, Diogo P. [3] ; Sequinel, Thiago [4] ; Bezzon, Vinicius Danilo N. [1] ; Beltran, Armando [5] ; Tebcherani, Sergio M. [6] ; Varela, Jose A. [1]
Total Authors: 8
[1] UNESP, Inst Chem, Dept Phys Chem, BR-14800060 Araraquara, SP - Brazil
[2] Univ Estadual Ponta Grossa, Dept Mat Engn, BR-84030900 Ponta Grossa, PR - Brazil
[3] UNESP IBILCE, Dept Chem & Environm Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[4] Univ Tecnol Fed Parana, Dept Prod Engn, BR-84016210 Ponta Grossa, PR - Brazil
[5] Univ Jaume 1, Dept Quim Fis & Analit, E-12071 Castellon de La Plana - Spain
[6] Univ Estadual Ponta Grossa, Dept Chem, BR-84030900 Ponta Grossa, PR - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Inorganic Chemistry; v. 54, n. 21, p. 10184-10191, NOV 2 2015.
Web of Science Citations: 8

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 (alpha-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 alpha-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 alpha-Bi2O3, resulting in a significant increase in the PL emission intensity. The Raman and XPS spectra also showed that the alpha-Bi2O3 PL emissions in the low-energy region (below similar to 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). (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC