The characteristics of X1 type Y 2SiO 5:Tb phosphor particles prepared by high temperature spray pyrolysis

Abstract

The X1 type Y 2SiO 5:Tb phosphor particles with high brightness were prepared by spray pyrolysis from spray solution with NH 4F flux material. The phosphor particles prepared by spray pyrolysis at high preparation temperature had spherical shape, fine size and dense morphology. The mean sizes of the phosphor particles prepared at 900 and 1650 °C were 1.3 and 0.9 μm. The emission spectrum of the phosphor particles prepared by spray pyrolysis at 1650 oC had the characteristics of X1 type Y 2SiO 5:Tb phosphor. The photoluminescence intensity of the phosphor particles directly prepared by spray pyrolysis from spray solution with 20 wt.% NH 4F flux of the product at temperature of 1650 °C was 127 and 184% of the X1 and X2 type Y 2SiO 5:Tb phosphor particles post-treated at 1100 and 1300 °C, respectively. The Y 2SiO 5:Tb phosphor particles prepared by spray pyrolysis at 1650 °C had X1 type crystal structure because of short residence time of particles inside hot wall reactor of 0.4 s.