Eu2+-doped BaAl2O4 green phosphors were prepared by a conventional solid-state reaction and the effects of Dy 3+ co-doping on the photoluminescence property were investigated. The phosphors were characterized by X-ray powder diffraction (XRD), fluorescence spectroscopy, field-emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS). XRD showed that all prepared samples exhibited a hexagonal BaAl2O4 phase. Fluorescence spectroscopy showed that the photoluminescence efficiency increased with increasing Eu 2+ concentration until 3 mol% then decreased at higher concentrations due to concentration quenching effect. Moreover, Dy3+ co-doping increased the photoluminescence efficiency of the Eu2+-doped BaAl2O4 phosphor.
Bibliographical noteFunding Information:
This work was partly supported by the IT R&D program of MKE/IITA [2009-F-020-01, Development of Red nitride phosphor and self-assembly phosphorescent layer packaging technology for high rendition LED illumination] and Ajou University research fellowship of 2010 (S-2010-G0001-00059).
Copyright 2011 Elsevier B.V., All rights reserved.
- Dy co-doping effects
- Optimum concentration
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry