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

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 at high temperature had a spherical shape, fine size and dense morphology. The mean sizes of the particles prepared at 900 and 1650 C were 1.3 and 0.9 micron. The emission spectrum of the particles prepared at 1650 C 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 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 at 1650 C had X1 type crystal structure because of short residence time of particles inside the hot wall reactor of 0.4 s. 15 refs.