Short-range structure and photoluminescent properties of the CaTiO3:Pr,La phosphor

Autor(es)

Ribeiro, Guilherme K. ; Vicente, Fabio S. ; Bernardi, Maria Ines B. ; Mesquita, Alexandre

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 688, p. 7-pg., 2016-12-15.

Resumo

Pr3+-doped CaTiO3 perovskite is a promising phosphor compound with the possibility of use in several technological applications. In this paper, we report the substitution of Ca2+ ions with La3+ ions in order to promote Ca vacancies to further enhance photoluminescence (PL). CaTiO3:Pr,La samples were prepared by the polymeric precursor method and their short-and long-range structure and photoluminescent properties were investigated in this paper. PL measurements show a narrow emission centered at 612 nm typical of the D-1(2) - H-3(4) transition of Pr3+ ions. As the La content increases, the intensity of this peak is increased. This enhancement of PL curves for CaTiO3:Pr,La samples is associated with disorder in the CaTiO3 lattice caused by the La incorporation. This disorder as a function of the La content is shown by both X-ray absorption near edge structure (XANES) spectra at the Ti K-edge and Raman spectroscopy measurements. CaTiO3:Pr,La samples do not present PL with long term afterglow. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/07909-4 - Preparação e caracterização de filmes de óxidos magnéticos nanoestruturados
• Beneficiário: Maria Inês Basso Bernardi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/12993-4 - Síntese e caracterização de materiais semicondutores nanoestruturados luminescentes
• Beneficiário: Alexandre Mesquita
• Modalidade de apoio: Auxílio à Pesquisa - Regular