Micrometre-sized zinc silicate phosphor powders prepared using a size-controllable droplet generator from a polyethylene glycol spray solution

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 Zn₂SiO ₄: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 x 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 x 10^-3 MPEG was 85% of that of the phosphor powders obtained from the spray solution without PEG.