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Luminescence Kinetic Model for Long-Afterglow Phosphor (Sr0.5 Ca1.5 ) MgSi2O7 :Eu^2+ ,Dy^3+
引用本文:刘波,施朝淑,陶冶,肖志国.Luminescence Kinetic Model for Long-Afterglow Phosphor (Sr0.5 Ca1.5 ) MgSi2O7 :Eu^2+ ,Dy^3+[J].中国物理快报,2005,22(5):1256-1259.
作者姓名:刘波  施朝淑  陶冶  肖志国
作者单位:[1]DepartmentofPhysics,UniversityofScienceandTechnologyofChina,Hefei230026 [2]InstituteofHighEnergyPhysics,ChineseAcademyofSciences,Beijing100039 [3]DalianLumingLightCo.Ltd.,Dalian116025
摘    要:A luminescence kinetic model for the green-emission long-afterglow phosphor (Sr0.5 Ca1.5)MgSi2O7:Eu^2 ,Dy^3 is proposed based on the studies of the thermoluminescence and isothermal decay curves at different temperatures.The isothermal decay curves at different temperatures meet the hyperbolic law and show to be dependent on temperature. Combined with the decay curves and the thermoluminescence curves, it can be concluded that the long afterglow of this material originates from the traps with energy distribution rather than a single level trap.Upon illumination with ultra-violet or visible light, the trap filling can proceed via excitation of 4f electrons to the 5d level of Eu^2 ions. After excitation, 5d electrons can be transferred to the trap related to Dy3 ions, and Eu^3 is left behind. Upon subsequent heating, the electron is released from this trap and recombines with Eu^3 to produce Eu^2 emission.

关 键 词:荧光核模型  绿色余辉磷  等温时滞曲率  热发光  能量分布
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