Optimization of $Nd^{3+}$ ion co-doping in $CaAl_2O_4:\;Eu^{2+}$ blue phosphor

$CaAl_2O_4:Eu^{2+}$ 청색(靑色) 형광체(螢光體)의 $Nd^{3+}$ 도핑 최적화(最適化)에 관한 연구(硏究)

  • Bartwal, Kunwar Singh (Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology) ;
  • Ryu, Ho-Jin (Energy Materials Research Centre, Korea Research Institute of Chemical Technology)
  • ;
  • 류호진 (한국화학연구원 에너지소재연구센터)
  • Published : 2007.10.27

Abstract

Blue phosphor calcium aluminate, $CaAl_2O_4:Eu^{2+}$ co-doped with $Nd^{3+}$ was prepared by solid state synthesis method. Phosphor materials with 1 mol% $Eu^{2+}$ and varying compositions of $Nd^{3+}$ show high brightness and long persistent luminescence. The synthesized phosphor materials were investigated by powder x-ray diffraction (XRD), SEM, TEM, photoluminescence excitation and emission studies. Broad band UV excited luminescence of the $CaAl_2O_4:Eu^{2+}:Nd^{3+}$ was observed in the blue region (${\lambda}_{max}=440\;nm$) due to transitions from the $4f^65d^1$ to the $4f^7$ configuration of the $Eu^{2+}$ ion. $Nd^{3+}$ ion doping in the phosphor results in long afterglow phosphorescence when the excitation light is cut off.

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