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http://dx.doi.org/10.4191/KCERS.2006.43.6.333

Synthesis and Photoluminescence of the Sr1-xBaxAl2O4:Eu2+, Dy3+ Long Phosphorescence Phosphor  

Park, Jin-Woo (Department of Materials Science and Engineering, The University of Seoul)
Kim, Jung-Sik (Department of Materials Science and Engineering, The University of Seoul)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.6, 2006 , pp. 333-337 More about this Journal
Abstract
In this study, the $Sr_{1-x}Ba_{x}Al_{2}O_{4}:Eu^{2+},Dy^{3+}$ phosphor were prepared by the solid-state reaction method and its photoluminescence properties were investigated. Starting powders of $SrCO_3,\;BaCO_3,\;and\;Al_{2}O_3$ were mixed with $Eu_{2}O_3$ as activator, $Dy_{2}O_3$ as co-activator and $B_{2}O_3$ as flux. Then, the mixed powders were heated at the temperature of $1100{\sim}1400^{\circ}C$ for 3 h under the reducing ambient atmosphere of $95%Ar+5%H_2$. The effect of Ba addition from 0.0 to 1.0 mol on photoluminescence was investigated. As the amount of Ba increased, the intensity of emission increased and the optimum long phosphorescence occurred at the amount of 0.1 mol Ba. The optimum sintering condition for long phosphorescent phosphor of $Sr_{1-x}Ba_{x}Al_{2}O_{4}:Eu^{2+},Dy^{3+}$($x=0{\sim}1.0mol$) was found at $1400^{\circ}C$. The excitation spectra showed a broad band of $250{\sim}450nm$ with maximum peak at 360 nm. The maximum peak intensity of emission spectra occurred at the range of $480{\sim}520nm$, depending on Ba content.
Keywords
$Sr_{1-x}Ba_{x}Al_{2}O_{4}$; Phosphor; Photoluminescence; Long phosphorescence;
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