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분무 열분해법으로 제조한 형광체 CaTiO3 : Pr의 특성
최정수,강윤찬,박승빈 ( Jeong Su Choi,Yun Chan Kang,Seung Bin Park ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
Spray pyrolysis using FEAG(Filter Expansion Aerosol Generator) process was applied to the preparation of multicomponent oxide phosphor ; red emitting perovskite CaTiO₃:Pr. The morphology, particle size and crystalline phase were investigated by scanning electron microscopy(SEM), centrifugal particle size analyzer(CPSA) and X-Ray diffraction pattern(XRD). Optimum conditions for the preparation and post-treatment of particles for good luminescence were determined by cathodoluminescence(CL) and photoluminescence(PL). Spherical and non-agglomerated particles of micron size were prepared by the spray pyrolysis. As the solution concentration increased from 0.04 M to 0.54 M, the mean size of the particles increased from 0.9 ㎛ to 1.68 ㎛. The optimum temperature and holding time for the post-treatment of CaTiO₃: Pr were 1,200℃ and 5 hours, respectively. The PL intensity of CaTiO₃: Pr particles prepared by spray pyrolysis was twice larger than that by solid state reaction. The spray pyrolysis reduced optimum post-treatment time from 12 hours to 5 hours at 1,200℃.