Persistent luminescence of Eu2+ and Dy3+ doped barium aluminate (BaAl2O4:Eu2+,Dy3+) materials

Autor(es)

Stefani, R. ^[1] ; Rodrigues, L. C. V. ^[1] ; Carvalho, C. A. A. ^{[1, 2]} ; Felinto, M. C. F. C. ^[3] ; Brito, H. F. ^[1] ; Lastusaari, M. ^{[4, 5]} ; Holsa, J. ^{[4, 5]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

^[2] Univ Fed Ouro Preto, Dept Quim, Ouro Preto - Brazil

^[3] IPEN CNEN SP, Sao Paulo - Brazil

^[4] Univ Turku, Dept Chem, FI-20014 Turku - Finland

^[5] Turku Univ, Ctr Mat & Surfaces, Turku - Finland

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 31, n. 12, p. 1815-1818, Oct. 2009.
• Área do conhecimento: Ciências Exatas e da Terra - Química
• Citações Web of Science: 47
• Assunto(s): Luminescência Európio Disprósio Fosfatos

Resumo

Polycrystalline Eu2+ and Dy3+ doped barium aluminate materials, BaAl2O4:Eu2+,Dy3+, were prepared with solid state reactions at temperatures between 700 and 1500 °C. The influence of the thermal treatments on the stability, homogeneity and structure as well as to the UV-excited and persistent luminescence of the materials was investigated by X-ray powder diffraction, SEM imaging and infrared spectroscopies as well as by steady state luminescence spectroscopy and persistent luminescence decay curves, respectively. The IR spectra of the materials prepared at 250, 700, and 1500 °C follow the formation of BaAl2O4 composition whereas the X-ray powder diffraction of compounds revealed how the hexagonal structure was obtained. The morphology of the materials at high temperatures indicated important aggregation due to sintering. The luminescence decay of the quite narrow Eu2+ band at ca. 500 nm shows the presence of persistent luminescence after UV irradiation. The dopant (Eu2+) and co-dopant (Dy3+) concentrations affect the crystallinity and luminescence properties of the materials. (AU)

• Processo FAPESP: 05/01216-0 - Preparação e estudo fotoluminescente da persistência luminosa de materiais com íons terras raras
• Beneficiário: Hermi Felinto de Brito
• Modalidade de apoio: Auxílio à Pesquisa - Regular