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

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

doi:10.1038/s41377-018-0089-7

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

Original Articles

- X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions
- X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions
- 光：科学与应用 2018年7卷第6期页码：866-876
- Affiliations：
  
  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
- Author bio：
  
  H.-T. Sun (timothyhsun@gmail.com)
- Funds：
- DOI：10.1038/s41377-018-0089-7
  中图分类号：
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Yan-Min Yang, Zhi-Yong Li, Jun-Ying Zhang, 等. X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions[J]. 光：科学与应用, 2018,7(6):866-876.

Yang, Y. M. et al. X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions. Light: Science & Applications, 6, 866-876 (2018).
Yan-Min Yang, Zhi-Yong Li, Jun-Ying Zhang, 等. X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions[J]. 光：科学与应用, 2018,7(6):866-876. DOI： 10.1038/s41377-018-0089-7.

Yang, Y. M. et al. X-ray-activated long persistent phosphors featuring strong UVC afterglow emissions. Light: Science & Applications, 6, 866-876 (2018). DOI： 10.1038/s41377-018-0089-7.

摘要

Abstract

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 X-ray 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.

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references

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