Hydrothermal preparation and persistence characteristics of nanosized phosphor SrS:Eu^(2+),Dy^(3+)  

作　　者：段晓霞 黄世华 由芳田 康凯 

机构地区：[1]Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University

出　　处：《Journal of Rare Earths》2009年第1期43-46,共4页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (10774012 and 10434030);Beijing Jiaotong University Program (2007XM048, 2006XM038)

摘　　要：Nanosized long-persistent phosphors SrS：Eu^2＋, Dy^3＋ were prepared by the hydrothermal method.The samples were characterized by X-ray powder diffraction, transmission electron microscopy, and charge-coupled device spectrometry.The persistence characteristic was studied using the decay curves.The results showed that the emission intensity decreased sharply with temperature increasing, although the particle size increased.The S2-vacancies caused by oxidization served as shallow traps, and Dy3＋ served as deep traps in SrS：Eu^2＋, Dy^3＋.The afterglow intensity of SrS：Eu^2＋, Dy^3＋ was higher than that of SrS：Eu2＋ prepared at the same temperature.However, the minimization span of initial afterglow with temperature for the former sample was larger than that for the latter.Binary-doped phosphor decayed more slowly than the singly doped one.The afterglow of SrS：Eu^2＋, Dy^3＋ decayed more quickly with the increase of sintering temperature.Nanosized long-persistent phosphors SrS：Eu^2＋, Dy^3＋ were prepared by the hydrothermal method.The samples were characterized by X-ray powder diffraction, transmission electron microscopy, and charge-coupled device spectrometry.The persistence characteristic was studied using the decay curves.The results showed that the emission intensity decreased sharply with temperature increasing, although the particle size increased.The S2-vacancies caused by oxidization served as shallow traps, and Dy3＋ served as deep traps in SrS：Eu^2＋, Dy^3＋.The afterglow intensity of SrS：Eu^2＋, Dy^3＋ was higher than that of SrS：Eu2＋ prepared at the same temperature.However, the minimization span of initial afterglow with temperature for the former sample was larger than that for the latter.Binary-doped phosphor decayed more slowly than the singly doped one.The afterglow of SrS：Eu^2＋, Dy^3＋ decayed more quickly with the increase of sintering temperature.

关 键 词：hydrothermal preparation nanosized phosphor luminescence quenching afterglow spectra rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]