Morphological and optical characteristics of BaMg_0.9Al ₁₀O₁₉:Mn²⁺ phosphor powders prepared by flame spray pyrolysis

Green-light emitting BaMg_0.9Al₁₀O₁₉: Mn²⁺ phosphor powders, with fine sizes, spherical shapes, and filled morphologies, were prepared by flame spray pyrolysis. The precursor powders obtained by flame spray pyrolysis from the aluminum polycation solution at low flow rate of the carrier gas had a fine size, dense structure and narrow size distribution even at very fast drying and decomposition rates of droplets or powders. Therefore, the BAM:Mn²⁺ phosphor powders obtained after post-treatment at a temperature of 1400°C had a spherical shape, fine size and filled morphology. The BAM:Mn²⁺ phosphor powders obtained at a post-treatment temperature of 1400°C had a high photoluminescence intensity under a vacuum ultraviolet light of 147 nm because of high crystallinity and good morphology.