摘要
采用高温固相法合成发光样品Y2O3:Eu30.+01和Y2O3:Eu30.+01,Dy03.+01.X射线衍射分析(XRD)表明样品保持Y2O3晶格结构,掺入的Eu3+和Dy3+对Y2O3基质晶体结构没有明显影响.样品光致发光均以Eu3+离子为发光中心,由Eu3+离子电子的4f能级跃迁所致,未见Dy3+离子发光峰.样品Y2O3:Eu03.+01,Dy03.+01具有长余辉特性,余辉衰减符合双指数衰减规律.热释光谱分析表明Y2O3:Eu03.+01中存在陷阱能级,但其没有余辉,即存在陷阱能级的样品不一定就会长余辉发光.样品Y2O3:Eu03.+01,Dy30.+01中存在与Y2O3:Eu30.+01相似的陷阱能级,说明Dy3+的掺入没有改变Eu3+陷阱能级,但有利于陷阱中电子的逃逸,从而产生长余辉发光.
The rare-earth doped phosphors Y2O3：Eu^3＋0.01 and Y2O3：Eu^3＋0.01,Dy^3＋0.01 were synthesized by a high temperature solid-state reaction method. The phase structures of the phosphors were characterized by X-ray diffraction. The Eu^3 ＋ and Dy^3 ＋ doping does not change the crystal sructure of Y2O3,the Eu^3 ＋ and Dy^3 ＋ ions enter into the host crystal lattice. The emission spectra due to ^5D0 →^7FJ of Eu^3 ＋ show that Eu^3 ＋ is the only luminescence center. There is no glow peak from Dy^3 ＋. The decay characteristics of phosphors Y2O3：Eu^3＋0.01,Dy^3＋0.01 follows the Double exponential distribution. The measurement of thermoluminescence reveals that the trap is generated by Eu^3 ＋. The Dy^3 ＋ doping doesn＇t change the trap depth,and helps the electrons escape from the trap,which induces long-afterglow luminescence.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第5期3344-3349,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:20671022
20871033
10774031)资助的课题~~
