(Ba,Sr)$_2SiO_4:Eu^{2+}$ Phosphor Particles by Spray Pyrolysis Process

  • Kang, Hee-Sang (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Kang, Yun-Chan (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, Hee-Dong (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Shul, Yong-Gun (Dept. of Chemical engineering, Yonsei Univ.)
  • Published : 2002.08.21

Abstract

$(Ba,Sr)_2SiO_4:Eu^{2+}$ phosphor particles with high brightness were prepared by spray pyrolysis. The changes in the photoluminescence intensity and morphology of $(Ba,Sr)_2SiO_4:Eu^{2+}$ were investigated by changing the posttreatment temperature and the concentration of dopant. The prepared $(Ba,Sr)_2SiO_4:Eu^{2+}$ particles has a dense structure, but irregular shape after the posttreatment. When they were excited by the ultraviolet light of 410 nm, a broad emission band with a peak at 508 nm was observed. The photoluminescence intensity of the prepared $(Ba,Sr)_2SiO_4:Eu^{2+}$ particles was enhanced by increasing the posttreatment temperature up to 1300 $^{\circ}C$ and further improved by adding several rear-earth codopants. The $(Ba,Sr)_2SiO_4:Eu^{2+}$ particles prepared by spray pyrolysis had a good excitation spectrum in the wavelength longer than 350 nm. Therefore, it was concluded that the $(Ba,Sr)_2SiO_4:Eu^{2+}$ prepared by spray pyrolysis is a good green-emitting phosphor for LED application.

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