Photoluminescence properties of cerium oxide nanoparticles as a function of lanthanum content

Autor(es)

Deus, R. C. ^[1] ; Cortes, J. A. ^[1] ; Ramirez, M. A. ^[1] ; Ponce, M. A. ^[2] ; Andres, J. ^[3] ; Rocha, L. S. R. ^[1] ; Longo, E. ^[3] ; Simoes, A. Z. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Unesp Fac Engn Guaratingueta, BR-12516410 Sao Paulo - Brazil

^[2] CONICET Univ Nacl Mar del Plata, Inst Invest Ciencia & Tecnol Mat INTEMA, RA-4302 Mar Del Plata, Buenos Aires - Argentina

^[3] Univ Estadual Paulista, Inst Quim, Lab Interdisciplinar Ceram, BR-14801907 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 70, p. 416-423, OCT 2015.
• Citações Web of Science: 20

Resumo

The structural and photoluminescent properties at room temperature of CeO2 and La-doped CeO2 particles were undertaken. The obtained particles were synthesized by a microwave-assisted hydrothermal method (MAH) under different lanthanum contents. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Fourier transform Raman (FT-Raman), Ultra-violet spectroscopy (UV-vis) and photoluminescence (PL) measurements were carried out. XRD revealed that the powders are free of secondary phases and crystallize in the cubic structure. Raman data show that increasing La doping content increase oxygen vacancies due to lattice expansion. The UV/vis absorption spectroscopy suggested the presence of intermediate energy levels in the band gap of structurally ordered powders. Lanthanum addition creates oxygen vacancies and shifts the photoluminescence in the low energy range leading to intense PL emission. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs