VUV characteristics of BaAl₁₂O₁₉:Mn²⁺ phosphor particles prepared from aluminum polycation solutions by spray pyrolysis

High efficiency BaAl₁₂O₁₉:Mn²⁺ phosphor particles with spherical shape and non-aggregation characteristics were prepared by large-scale spray pyrolysis from aluminum polycation precursor solutions. The phosphor particles prepared from nitrate precursors had a hollow and irregular structure under the preparation conditions of high concentration solution, high flow rate of carrier gas, and large size reactor. However, the BaAl₁₂O₁₉:Mn phosphor particles prepared from aluminum polycation precursor solution had completely spherical shape and filled morphology after post-treatment at 1400 °C. The as-prepared particles obtained from aluminum polycation precursor solution had spherical shape and dense structure under the severe preparation conditions by forming viscous gel precursors at the drying stage of the droplets. The mean size of the BaAl₁₂O₁₉:Mn phosphor particles increased from 1.2 to 2.7 μm when the concentration of the solution changed from 0.8 to 2 M. The prepared BaAl₁₂O₁₉:Mn phosphor particles had high luminescence intensities irrespective of the type of precursor solutions under vacuum ultraviolet. The maximum peaks of the prepared BaAl₁₂O₁₉:Mn and the commercial Zn₂SiO₄:Mn phosphor particles are located at 516 nm and 527 nm, respectively.