摘要
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.
Al^3＋ and Mg^2＋-doped SrTiO3∶Pr^3＋ phosphors are synthesized by a new sol-gel method and the mechanism on the enhancement of red luminescence intensity of SrTiO3∶Pr^3＋ by Al^3＋ and Mg^2＋ additions are investigated.From the photoluminescence（PL）spectra,X-ray diffraction patterns and Mulliken population analysis,it is speculated that one of the origins of the enhancement is the intensified Pr-O and Ti-O bonds by addition of Al^3＋ and Mg^2＋ in SrTiO3∶Pr^3＋.Because the Pr-O and Ti-O bonds are intensified and the corresponding bond lengths are reduced by addition of Al^3＋ and Mg^2＋ in SrTiO3 ： Pr^3＋, the host to activator energy transfer efficiency is improved, leading to the enhancement of luminescence efficiency of SrTiO3 ： Pr^3＋. And the fundamental excited mechanism in SrTiO3 ： Pr^3＋ is not changed by addition of Al^3＋ and Mg^2＋.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2009年第10期2624-2628,共5页
Acta Photonica Sinica
基金
Supported by the Natural Science Foundation of Shaanxi Province(2005F06)
Northwest University Graduate Innovation and Creativity Funds(08YZZ47)
