One-step synthesis of the green phosphor Ce-Tb-Mg-Al-O system with spherical particle shape and fine size

Spray pyrolysis method was applied to the preparation of Ce0.6Tb0.4MgAl11O1 9 green phosphor particles. The characteristics of as-prepared particles su ch as photoluminescence, crystallinity, and morphology were compared with t hose of post-treated particles. The as-prepared particles at 1700 degreesC had higher crystallinity and photoluminescence properties compared with tho se of post-treated particles. The morphology of as-prepared particles obtai ned at low temperatures changed from spherical shape to plate-like shape af ter post-treatment at 1400 degreesC for 3 h. The particles directly prepare d at 1700 degreesC had the mean size of 0.7 mum and non-aggregation charact eristics. This study has demonstrated that without post-treatment processin g/annealing, spherical phosphor particles having complex composition could be prepared by a one-step synthesis.