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http://dx.doi.org/10.3740/MRSK.2007.17.11.612

Photoluminescence and Thermal Characteristics of SrAl2O4:Eu+2, Dy+3 Phosphors Synthesized with Various Aluminum Compounds  

Lee, Young-Ki (Division of Semiconductor Engineering, Uiduk University)
Lee, You-Kee (Division of Semiconductor Engineering, Uiduk University)
Publication Information
Korean Journal of Materials Research / v.17, no.11, 2007 , pp. 612-617 More about this Journal
Abstract
Both photoluminescence and thermal characteristics for $SrAl_2O_4:Eu^{+2},\;Dy^{+3}$ phosphors synthesized with various aluminum compounds (${\alpha}-Al_2O_3$, ${\gamma}-Al_2O_3$, amorphous-$Al_2O_3$ and $Al(OH)_3)$ were investigated in this study. The formation temperature of the host $SrAl_2O_4$ crystal is changed by these various aluminum compounds, as a result of the different thermal decomposition temperature of $SrCO_3$ phase. Among these compounds, the amorphous-$Al_2O_3$ phase shows the lowest formation temperature of the host $SrAl_2O_4$ crystal. The PL emission and excitation spectra of $SrAl_2O_4:Eu^{+2},\;Dy^{+3}$ phosphor are not affected by these aluminum compounds. After the removal of the Xenon lamp excitation (360 nm), however, the excellent longphosphorescent property of the phosphor is obtained by the amorphous-$Al_2O_3$ phase, although the decay time for all phosphors decrease exponentially.
Keywords
$SrAl_2O_4:Eu^{+2},\; Dy^{+3}$ Phosphor; Aluminum compound; Photoluminescence; Thermal characteristics;
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