Spherical shape Zn2SiO4:Mn,Ba phosphor powders several micrometres in size were prepared by a filter expansion aerosol generator (FEAG) process. The mean size of the Zn2SiO4:Mn,Ba phosphor powders prepared by the FEAG process from a spray solution containing polyethylene glycol (PEG) was 1.5 μm. On the other hand, the mean size of the Zn2SiO4:Mn,Ba phosphor powders prepared by ultrasonic spray pyrolysis from the same concentration of the spray solution was 0.5 μm. The maximum photoluminescence intensity of the phosphor powders obtained from the spray solution with 8 × 10−4 MPEG was 109% of that of the phosphor powders obtained from the spray solution without PEG. The minimum photoluminescence intensity of the phosphor powders obtained from the spray solution with 1.6 × 10−3 MPEG was 85% of that of the phosphor powders obtained from the spray solution without PEG.

Keywords: spray pyrolysis, gas phase reaction, phosphor, zinc silicate.