Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Photoluminescence and Thermal Characteristics of SrAl2O4:Eu+2, Dy+3 Phosphors Synthesized with Various Aluminum Compounds

SrAl2O4:Eu+2, Dy+3 장잔광 형광체 합성에 있어서 알루미늄 화합물에 따른 열적거동 및 발광특성 변화

  • Lee, Young-Ki (Division of Semiconductor Engineering, Uiduk University) ;
  • Lee, You-Kee (Division of Semiconductor Engineering, Uiduk University)
  • 이영기 (위덕대학교 반도체전자공학부) ;
  • 이유기 (위덕대학교 반도체전자공학부)
  • Published : 2007.11.27
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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.

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