Triple-Mode Emissions with Invisible Near-Infrared After-Glow from Cr3+-Doped Zinc Aluminum Germanium Nanoparticles for Advanced Anti-Counterfeiting Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yi Zhang
  • Rui Huang
  • Hongliang Li
  • Zhenxu Lin
  • Dejian Hou
  • Yanqing Guo
  • Jie Song
  • Chao Song
  • Zewen Lin
  • Wenxing Zhang
  • Jing Wang
  • Chao Zhu

Detail(s)

Original languageEnglish
Article number2003121
Number of pages7
Journal / PublicationSmall
Volume16
Issue number35
Online published6 Aug 2020
Publication statusPublished - 3 Sep 2020

Abstract

Materials exhibiting persistent luminescence (PersL) have great prospect in optoelectronic and biomedical applications such as optical information storage, bio-imaging, and so on. Unfortunately, PersL materials with multimode emission properties have been rarely reported, although they are expected to be very desirable in multilevel anti-counterfeiting and encryption applications. Herein, Cr3+-doped zinc aluminum germanium (ZAG:Cr) nanoparticles exhibiting triple-mode emissions are designed and demonstrated. Upon exposure to steady 254 nm UV light, the ZAG:Cr nanoparticles yield steady bluish-white emission. After turning off the UV light, the emission disappears quickly and the mode switches to transient near-infrared (NIR) PersL emission at predominantly 690 nm. The transient NIR PersL emission which arises from Cr3+ is induced by non-equivalent substitution of Ge4+. After persisting for 50 min, it can be retriggered by 980 nm photons due to the continuous trap depth distribution of ZAG:Cr between 0.65 and 1.07 eV. Inspired by the triple-mode emissions from ZAG:Cr, multifunctional luminescent inks composed of ZAG:Cr nanoparticles are prepared, and high-security labeling and encoding encryption properties are demonstrated. The results indicate that ZAG:Cr nanoparticles have great potential in anti-counterfeiting and encryption applications, and the strategy and concept described here provide insights into the design of advanced anti-counterfeiting materials.

Research Area(s)

  • anti-counterfeiting, chromium, emission, nanoparticles, zinc aluminum germanium

Citation Format(s)

Triple-Mode Emissions with Invisible Near-Infrared After-Glow from Cr3+-Doped Zinc Aluminum Germanium Nanoparticles for Advanced Anti-Counterfeiting Applications. / Zhang, Yi; Huang, Rui; Li, Hongliang; Lin, Zhenxu; Hou, Dejian; Guo, Yanqing; Song, Jie; Song, Chao; Lin, Zewen; Zhang, Wenxing; Wang, Jing; Chu, Paul K.; Zhu, Chao.

In: Small, Vol. 16, No. 35, 2003121, 03.09.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review