| Sr1-xBaxAl2O4:Eu2+, Dy3+계 축광성 형광체의 합성과 그의 발광특성 |
| 박진우, 김정식 |
| 서울시립대학교 신소재공학과 |
| Synthesis and Photoluminescence of the Sr1-xBaxAl2O4:Eu2+, Dy3+ Long Phosphorescence Phosphor |
| Jin-Woo Park, Jung-Sik Kim |
| Department of Materials Science and Engineering, The University of Seoul |
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| ABSTRACT |
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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. |
| Key words:
$Sr_{1-x}Ba_{x}Al_{2}O_{4}$, Phosphor, Photoluminescence, Long phosphorescence |
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