Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (12): 1256-1262.DOI: 10.15541/jim20210043

• RESEARCH ARTICLE • Previous Articles     Next Articles

Luminescence Property of the Multicolor Persistent Luminescence Materials for Dynamic Anti-counterfeiting Applications

ZHANG Cong(), LI Yurou, SHAO Kang, LIN Jing, WANG Kai, PAN Zaifa()   

  1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2021-01-25 Revised:2021-03-03 Published:2021-12-20 Online:2021-04-05
  • Contact: PAN Zaifa, associate professor. E-mail: panzaifa@zjut.edu.cn
  • About author:ZHANG Cong(1996-), male, Master candidate. E-mail: 1765521429@qq.com
  • Supported by:
    National Natural Science Foundation of China(10804099);National Natural Science Foundation of China(21804119);Key Project of Natural Science Foundation of Zhejiang Province(LZ18B050002)

Abstract:

Luminescent anti-counterfeiting has characteristics of visibility and convenience, which is a popular method in many anti-counterfeiting technologies. However, this anti-counterfeiting luminescent materials have the shortcomings of single emission color and static anti-counterfeiting pattern, leading to easy imitablity. It is urgent to develop new luminescent materials that can achieve dynamic and more reliable anti-counterfeiting performance. In this research, the multicolor persistent luminescence material, chromium doped zinc gallogermanate, was prepared by hydrothermal method. Its persistent luminescence property and dynamic anti-counterfeiting application potential were investigated. Experimental results show that the emission intensity in blue-green and red light regions can be adjusted by changing the raw materials ratio of gallium to germanium. Under the excitation of 254 and 365 nm UV light, a series of samples are observed to be white and red, respectively, indicating multi-mode luminescence characteristics. Furthermore, the decay rate of blue, green and red components in white afterglow is different, so the afterglow color can change dynamically over time. Anti-counterfeiting patterns, designed based on this multicolor afterglow features, improves the security through dynamic change of afterglow color in the time dimension, demonstrating the potential application in dynamic anti-counterfeiting.

Key words: persistent luminescence, multicolor afterglow, dynamic anti-counterfeiting

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