The characteristics of X1 type Y2SiO5:Tb phosphor particles prepared by high temperature spray pyrolysis

The X1 type Y2SiO5:Tb phosphor particles with high brightness were prepared by spray pyrolysis from spray solution with NH4F 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 1650oC had the characteristics of X1 type Y2SiO5:Tb phosphor. The photoluminescence intensity of the phosphor particles directly prepared by spray pyrolysis from spray solution with 20 wt.% NH4F flux of the product at temperature of 1650 °C was 127 and 184% of the X1 and X2 type Y2SiO5:Tb phosphor particles post-treated at 1100 and 1300 °C, respectively. The Y2SiO5: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.