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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.)

Tunable photoluminescence of CaCu3Ti4O12 based ceramics modified with tungsten

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Author(s):
Moreno, H. [1] ; Cortes, J. A. [1] ; Praxedes, F. M. [1] ; Freitas, S. M. [2] ; Rezende, M. V. S. [2] ; Simoes, A. Z. [1] ; Teixeira, V. C. [3] ; Ramirez, M. A. [1]
Total Authors: 8
Affiliation:
[1] Sao Paulo State Univ, Fac Engn Guaratingueta, UNESP, Av Dr Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP - Brazil
[2] Fed Univ Sergipe UFS, Ctr Exact Sci & Technol CCET, Dept Phys, Marechal Rondon S-N, BR-49100000 Sao Cristovao, SE - Brazil
[3] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 850, JAN 5 2021.
Web of Science Citations: 6
Abstract

CaCu3Ti4O12 (CCTO): x% W (x = 0.00, 0.02, 0.05, 0.10, 2.50, and 5.00) powders were prepared via solid-state reaction. The effect of W addition in the (micro)structure and optical properties was analyzed using computing simulations and experimental techniques. The widespread application of perovskite-lightemitting diodes (PeLED5), photovoltaic devices, and photocatalysis is limited by the intrinsic instability of the perovskite materials (e.g., metal halides), compromising operational efficiency, and pushing for the development of novel perovskite materials. The Rietveld analysis and XPS results confirm the presence of W5+, Ti3+, and Cu+ ions in all samples of the CaCu3Ti4O12 : x% W system, leading to structural changes that strongly influence the PL response of the material. Based on a correlation approach, a practical model explaining the relationship between electronic defects and photoluminescent (PL) emissions in the CCTO system is proposed. On samples x = 0.00, 0.10, and 5.00, red PL emissions are due to the presence of metal vacancies, and deep-level defects, while blue PL emissions on samples x = 0.02, 0.05, and 2.50 are associated with shallow defects. Thus, our research shows evidence that CaCu3Ti4O12 (CCTO): W ceramic systems may be promising to photonics applications. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 18/18236-4 - Development of advanced CaCu3Ti4O12 ceramics in the form of powders, bulks, and nanostructured films: an integrated studied of its multifunctional properties
Grantee:Henrique Piccoli Moreno
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)