Study On Preparation And Properties Of RE³⁺（RE=La,Sm,Pr）, Ce³⁺:YGG Polycrystalline Luminous Powder

RE3+(RE=La,Sm,Pr),Ce3+:YGG polycrystalline luminous powders were prepared by citrate-gel low temperature combustion method and ammonia co-precipitation method,the influencing factors on preparation methods were discussed and the best preparation technics were summarized.The samples were characterized via XRD, IR, SEM and fluorescence spectra. XRD showed that the optimal calcination temperature was900℃; SEM observation found that the particle size was uniform, but the particle size was big which the sample was prepared by co-precipitation method.Fluorescence spectra showed that the fluorescence emission peak of Ce3+:YGG and La3+,Ce3+:YGG samples was520nm, corresponding to Ce3+ion level transition,but the fluorescence emission peak of Sm3+,Ce3+:YGG sample was610nm, belongs to Sm3+ion level transition,and the fluorescence emission peak of Pr3+,Ce3+:YGG samples was490nm, belongs to Pr3+ion energy level transition, it was that because the fluorescence intensity of Sm3+or Pr3+was higher than the fluorescence intensity of Ce3+ion, so the fluorescence emission of Ce3+ion was not found.