Influence of Bi 2O 3 flux in the structural and photoluminescence properties of SrAl 2O 4:Eu 2+ phosphors
Journal
Ceramics International
Journal Volume
39
Journal Issue
1
Pages
159-163
Date Issued
2013
Author(s)
Abstract
SrAl 2O 4:Eu 2+ phosphors with various content of Bi 2O 3 flux were synthesized and analyzed. It was observed that the crystallinity and the particle size of the phosphors were increased with the addition of Bi 2O 3 flux. These phenomena are considered to be caused via the melting of the Bi 2O 3 flux particles during the synthesis of the phosphors. The melted Bi 2O 3 flux increased the mobility and homogeneity of solid reactants, thereby enhancing the photoluminescence intensity of the phosphors. SrAl 2O 4:Eu 2+ phosphors with Bi 2O 3 as the flux exhibited a broad green emission with a peak at 520 nm. The highest photoluminescence emission intensity was observed when 5 mol% Bi 2O 3 flux was added into the phosphors. The emission is due to 4f 65d¡÷4f 7 ( 8S 7/2) transitions of the Eu 2+ ions. Moreover, Bi 2O 3 flux extended the application of the ultraviolet excited phosphors toward the blue-light excited phosphors. Nevertheless, the influence of Bi 2O 3 on the afterglow and the emission color of SrAl 2O 4:Eu 2+ phosphors were not significant. This research indicated that Bi 2O 3 flux is effective flux for synthesizing SrAl 2O 4:Eu 2+ phosphors. ? 2012 Elsevier Ltd and Techna Group S.r.l.
Subjects
Bi 2O 3 flux
Morphology
Photoluminescence
SrAl 2O 4:Eu 2+ phosphors
Type
journal article