X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions  

作　　者：Yan-Min Yang Zhi-Yong Li Jun-Ying Zhang Yue Lu Shao-Qiang Guo Qing Zhao Xin Wang Zi-Jun Yong Hong Li Ju-Ping Ma Yoshihiro Kuroiwa Chikako Moriyoshi Li-Li Hu Li-Yan Zhang Li-Rong Zheng Hong-Tao Sun 

机构地区：[1]College of Physics Science and Technology,Hebei University,071002 Baoding,China [2]College of Chemistry,Chemical Engineering and Materials Science,Soochow University,215123 Jiangsu,China [3]Department of Physics,Beihang University,100191 Beijing,China [4]Department of Physical Science,Hiroshima University,Higashihiroshima,Hiroshima 739-8526,Japan [5]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,201800 Shanghai,China [6]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,100049 Beijing,China

出　　处：《Light(Science & Applications)》2018年第1期222-232,共11页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant nos.11574225,11874275,51672106,and 11474083);a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：Phosphors emitting visible and near-infrared persistent luminescence have been explored extensively owing to their unusual properties and commercial interest in their applications such as glow-in-the-dark paints,optical information storage,and in vivo bioimaging.However,no persistent phosphor that features emissions in the ultraviolet C range(200–280 nm)has been known to exist so far.Here,we demonstrate a strategy for creating a new generation of persistent phosphor that exhibits strong ultraviolet C emission with an initial power density over 10 milliwatts per square meter and an afterglow of more than 2 h.Experimental characterizations coupled with first-principles calculations have revealed that structural defects associated with oxygen introduction-induced anion vacancies in fluoride elpasolite can function as electron traps,which capture and store a large number of electrons triggered by Xray irradiation.Notably,we show that the ultraviolet C afterglow intensity of the yielded phosphor is sufficiently strong for sterilization.Our discovery of this ultraviolet C afterglow opens up new avenues for research on persistent phosphors,and it offers new perspectives on their applications in terms of sterilization,disinfection,drug release,cancer treatment,anti-counterfeiting,and beyond.

关 键 词：ULTRAVIOLET FLUORIDE VISIBLE 

分 类 号：O61[理学—无机化学]