Spray pyrolysis using FEAG (Filter Expansion Aerosol Generator) process was applied to the preparation of multicomponent phosphor materials ; red emitting perovskite $CaTiO_3$ :Pr, green emitting willemite $Zn_2SiO_4$ :Mn and YAG:Tb. The morphology, crystalline phase and thermal characteristics of the prepared particles were investigated by SEM/EDX, XRD, CPSA and TG/DTA. Optimum conditions for the preparation and post-treatment of particles with good luminescence were determined by CL (cathodoluminescence) and PL (photoluminescence).
Spherical and non-agglomerated particles with submicron size were prepared by spray pyrolysis. The mean size of the particles increased with the solution concentration. Phase-pure particles were prepared at lower temperatures than solid state reactions. The particles with pure phase and high crystallinity had high brightness. The optimum post-treatment conditions of the $CaTiO_3$ :Pr, $Zn_2 SiO_4$ :Mn and YAG:Tb particles were 1200℃, 1200℃ and 1400℃, respectively, for 5 hours. The PL intensity of $CaTiO_3$ :Pr particles prepared by spray pyrolysis was twice larger than that by solid state reaction. XRD pattern of the zinc silicate particles from stoichiometric solution showed zinc oxide peak. After post-treatment at 1200℃ for 5hours, phase-pure willemite particles were prepared. At 900℃, at which the YAG:Tb particles prepared by solid state reaction is not activated, the particles by spray pyrolysis showed the CL intensity of 27.6 cd/㎡.
