Effect of preparation temperature on the formation of Sr ₂CeO₄ phosphor particles in the spray pyrolysis

Sr₂CeO₄ phosphor particles were prepared by spray pyrolysis at various preparation temperatures. The effect of preparation temperatures on the morphology, crystal structure and photoluminescence characteristics of the post-treated Sr₂CeO₄ phosphor particles was studied. Phase pure Sr₂CeO₄ phosphor particles were not produced by spray pyrolysis without post-treatment The optimum post-treatment temperature to produce the Sr₂CeO₄ phosphor particles with high photoluminescence intensity was 1,000°C in spray pyrolysis. The spherical morphology of the as-prepared particles obtained at high preparation temperatures above 1,400°C had maintained after post-treatment at 1,000°C. The relative photoluminescence intensities of the Sr₂CeO₄ phosphor particles varied with the preparation temperatures in the spray pyrolysis. The as-prepared particles obtained by spray pyrolysis at preparation temperatures below 1,400°C converted into phase pure Sr₂CeO₄ phosphor particles after post-treatment at 1,000°C. The optimum preparation temperature of the as-prepared particles was 1,400°C to produce the Sr₂CeO ₄ phosphor particles with spherical shape and high photoluminescence intensity in the spray pyrolysis.