Excitation Wavelength Dependent Fluorescence of an ESIPT Triazole Derivative for Amine Sensing and Anti-Counterfeiting Applications

Yujian Zhang, Heyi Yang, Huili Ma, Gaofeng Bian, Qiguang Zang, Jingwei Sun, Cheng Zhang, Zhongfu An, Wai Yeung Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

84 Citations (Scopus)


Excitation wavelength dependent (Ex-De) emission materials have potential applications in anti-counterfeiting labels and bioimaging. Nevertheless, few purely organic chromophores are used in these areas. In this study, multiple excited states were incorporated into a molecule that was excited state intramolecular proton transfer (ESIPT) active, with the goal of manipulating the relaxation pathways of the excited states. The triazole derivative exhibits Ex-De photoluminescence (PL), and the maximum PL wavelength is located at 526 nm and 593 nm under a series of excitation wavelengths. Spectral identification indicates that the excimer and ESIPT processes are responsible for the green (526 nm) and orange (593 nm) fluorescence, respectively. Importantly, the quick response code and test strip prepared with this triazole derivative can be used for anti-counterfeiting and food spoilage detection applications, respectively. This research opens the door for developing novel Ex-De materials for anti-counterfeiting purposes.

Original languageEnglish
Pages (from-to)8773-8778
Number of pages6
JournalAngewandte Chemie - International Edition
Issue number26
Publication statusPublished - 24 Jun 2019


  • chromophores
  • excimers
  • fluorescence
  • heterocycles
  • materials science

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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