Unveiling photoluminescent response of Ce-doped CaCu3Ti4O12: An experimental-theoretical approach br

Author(s)

Moreno, H. ; Damm, M. ; Freitas, S. M. ; Rezende, M. V. S. ; Simoes, A. Z. ; Biasotto, G. ; Mastelaro, V. R. ; Teixeira, V. C. ; Ramirez, M. A.

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 923, p. 16-pg., 2022-11-25.

Abstract

CaCu3Ti4O12: x% Ce (x = 0.00, 0.25, 0.50, 0.75, and 1.00) ceramic composites were prepared via solid-state reaction. Theoretical atomistic simulations were combined with experimental techniques to uncover Ce effects in the (micro)structure and photoluminescence of CaCu3Ti4O12-based ceramics. Application of perovskites ceramics in optoelectronics have been limited by their specific, narrow emission range, which compromise operational efficiency, pushing for the development of novel perovskite-emissive materials. This study results confirm that Ce ions are incorporated at Ca sites within the CaCu3Ti4O12 lattice, inducing point metal and oxygen vacancies in the optical bandgap region. Shallow-level defects (V-Ca/V-O ) were as-sociated with broadband violet-blue photoluminescent (PL) emissions. Better color rendering may be a direct consequence of crystalline field splitting/wider PL emission. Furthermore, results demonstrate that PL on CaCu3Ti4O12: Ce system intensity can be modulated by structural defects, making it promising for applications in optoelectronics. (C) 2022 Published by Elsevier B.V. (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)