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


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.


  1. G.C. Kim, T.W. Kim, S.I. Mho, S.G. Kim, H.L. Park, 1999: Tuning Emission Colors Through Cross-Relaxation in Heavily Tb3+-Doped $CaYAIO_4$, J Korean Phys Soc 34, pp. 97-99
  2. C.H. Kim, H.L. Park, S.I. Mho, 1997: Photoluminescence of $ Eu^{3+}$ and $Bi^{3+} $in $Na_3YSi_3O_9$, Solid State Commun. 101, pp. 109-112 https://doi.org/10.1016/S0038-1098(96)00542-X
  3. H. Yamamoto, S. Okamoto, 2000: Efficiency enhancement by aluminum addition to some oxide phosphors for field emission displays, Display, 21, pp. 93-98 https://doi.org/10.1016/S0141-9382(00)00034-2
  4. H. Yamamoto, S. Okamoto, H. Kobayashi, 2002: Luminescence of rare-earth ions in perovskite-type oxides: from basic research to applications, J. Lum., 100, pp.325-332 https://doi.org/10.1016/S0022-2313(02)00432-5
  5. S. Itoh, H. Toki, K. Tamura, F. Kataoka, 1999: A New Red-Emitting Phosphor, $SrTiO_3:Py^{3+}$, for Low- Voltage Electron Excitation, Jap. J. Appl. Phys., 38, pp. 6387-6391 https://doi.org/10.1143/JJAP.38.6387
  6. Y. Lin, Z. Tang, Z. Zhang, C. Nan, 2003: Influence of codoping different rare earth ions on the luminescence of $CaAl_2O_4$-based phosphors, J. Eur. Ceram. Soc. 23, pp. 175 https://doi.org/10.1016/S0955-2219(02)00080-8
  7. R. Sakai, T. Katsumata, S. Komuro, T. Morikawa, 1999: Effect of composition on the phosphorescence from $BaAl_2O_4$: $Eu^{2+} $, $Dy^{3+} $ crystals, J. Lumin. 85, pp. 149-154 https://doi.org/10.1016/S0022-2313(99)00061-7
  8. Y. Murayama, N. Takeuchi, Y. Aoki, T. Matsuzawa, Phosphorescent Phosphor, US Patent 5424006 (1995)
  9. K.S. Bartwal and H. Ryu, 2007: Eu Doping Effect on $CaAl_2O_4$: $Eu^{2+} $ Phosphor Material, J. Semiconductor & Display Equipment Technology, 6, pp. 65-68
  10. I.V. Kityk, J. Wasylak, D, Dorosz, J. Kucharski, 2001: $Eu^{3+}$ -doped glass materials for red luminescence, Optics & Laser Tech. 33, pp. 157-160 https://doi.org/10.1016/S0030-3992(01)00012-3
  11. J.Y. Zhang, Z.T. Zhang, T.M. Wang, W.C. Hao, 2003: Preparation and characterization of a new long afterglow indigo phosphor $Ca_{12}AI_{14}O_{33}:Nd,Eu$, Mater. Lett. 57, pp. 4315-4318 https://doi.org/10.1016/S0167-577X(03)00309-4