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采用溶胶凝胶法成功制备了SrTiO3∶Pr3+、SrTiO3∶Pr3+,Mg2+及SrTiO3∶Pr3+,Al3+荧光粉.通过XRD、PL谱及第一性原理计算对样品的晶体结构、光谱特性及发光增强机制进行了研究.研究结果表明:共掺杂后,SrTiO3∶Pr3+荧光粉为单一组成的SrTiO3立方相,主发射锋位于617nm,对应于Pr3+离子的1D2→3H4跃迁发射.SrTiO3∶Pr3+,Mg2+及SrTiO3∶Pr3+,Al3+荧光粉的发光强度分别是SrTiO3∶Pr3+荧光粉发光强度的7倍和2倍,但主要发光机制没有改变.Mulliken布局分析表明,Mg2+、Al3+离子的掺入使SrTiO3∶Pr3+荧光粉中Ti-O及Pr-O键的化学键增强、键长变短,SrTiO3∶Pr3+基质向Pr3+离子发光中心的能量传递效率提高,导致SrTiO3∶Pr3+,Mg2+及SrTiO3∶Pr3+,Al3+荧光粉的发光效率提高.
SrTiO3: Sr3 +, SrTiO3: Sr3 +, Mg2 + and SrTiO3: Sr3 +, Al3 + phosphors were successfully prepared by sol-gel method.The crystal structure, spectral characteristics and luminescence enhancement mechanism of the samples were investigated by XRD, PL and first principles calculations The results show that the SrTiO3: Pr3 + phosphor is a single SrTiO3 cubic phase with a dominant emission front at 617 nm, which corresponds to the 1D2 → 3H4 transition emission of Pr3 + ions after co-doping. SrTiO3: Pr3 +, Mg2 + and SrTiO3: Pr3 +, Al3 + phosphors were 7 times and 2 times that of SrTiO3: Pr3 + phosphors, respectively, but the main luminescence mechanism did not change.Mulliken layout analysis showed that the incorporation of Mg2 +, Al3 + ions into SrTiO3: Pr + phosphor The chemical bond of Ti-O and Pr-O bond is enhanced and the bond length is shortened. The energy transfer efficiency of SrTiO3: Pr + substrate toward the luminescent center of Pr3 + ion is increased, resulting in an increase of the luminescent efficiency of SrTiO3: Pr3 +, Mg2 + and SrTiO3: Pr3 +, Al3 + phosphors .