Preparation of Hexaaluminate Phosphor Particles with Spherical Shape by Gas Phase Reaction Process

摘要

The morphology and photoluminescence characteristics of green light emitting hexaaluminate phosphor particles prepared by high temperature spray pyrolysis from spray solution with and without ammonium dihydrogen phosphate flux were investigated.The particles prepared from spray solution without flux material had hollow morphology at preparation temperatures between 900 deg C and 1,650 deg C.Ammonium dihydrogen phosphate flux added into spray solution enabled the formation of particles with spherical shape and filled morphology at preparation temperatures between 900 deg C and 1,650 deg C.The hexaaluminate phosphor particles with magnetoplumbite structure were directly prepared by spray pyrolysis from spray solution with ammonium dihydrogen phosphate flux above 1,600 deg C.Ammonium dihydrogen phosphate flux was effective in improving the photoluminescence intensity of the phosphor particles at low preparation temperatures.The phosphor particles prepared from spray solution with and without flux material by spray pyrolysis under reducing atmosphere at 1,650 deg C had comparable photoluminescence intensities with that of the phosphor particles optimized by post-treatment.