CaTiO3:Pr3 红色磷光体余辉性能的改进

采用高温固相法制备了CaTiO3:Pr3 ,X3 (X3 ＝Gd3 ,Dy3 ,Tb3 ,Eu3 )红色长余辉发光材料,对其余辉衰减曲线、激发光谱、发射光谱和X射线衍射谱进行了测试与分析讨论.就余辉衰减曲线来看,除Gd3 外,其余3种离子对余辉性能均有一定程度的改善.激发光谱为一宽带谱,共掺杂后主、次激发峰发生红移,在458,478,482 nm和496 nm处的激发光谱强度大大增强.发射光谱是峰值位于614 nm的窄带谱,对应于Pr3 的1D2-3H4的跃迁发射.X射线粉末衍射的结果表明该磷光体为CaTiO3结构,共掺杂的稀土离子并未对基质晶格产生较大影响.

Improvement of the Luminescent Performances of CaTiO3:Pr3

Long after-glow red phosphors CaTiO_3:Pr~(3+),X~(3+)( X~(3+)=Gd~(3+),Dy~(3+),Tb~(3+),Eu~(3+)) were prepared by Solid State reaction process. The excitation spectrum, emission spectrum, XRD and the curve of afterglow decay were investigated. The decay curves indicate the luminescent performance is improved by co-doped the other three ions except Gd~(3+). Co-doping with Tb~(3+) and Eu~(3+) the excitation spectrum is a broad band , the main excitation spectrum and the subordinate excitation spectrum are red-shift. The absorption at 458,478,482 nm and 496 nm are increased. The emission spectrum peaking at 614 nm is due to a transition from ~1D_2-~3H_4 of Pr~(3+).The results of XRD reveal there is CaTiO_3 phase and the co-dopant isn't change the crystal field notably.