Angewandte Chemie International Edition
10.1002/anie.201902890
COMMUNICATION
In summary, we developed a metal-free chromophore with
excitation wavelength-dependent fluorescence properties that shows
enol-form LE, excimer, and ESIPT triple-mode emissions. Upon
irradiation with low-energy light, light-green fluorescence was clearly
observed, which is related to the excimer emission, whereas the bright-
orange fluorescence corresponds to the keto-form ESIPT process upon
high-energy excitation. Interestingly, BH-BA was successfully utilized
in QR code identification in a dark environment. Moreover, its
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3
detection limit for NH was as low as 14.1 ppm, and the portable BH-
BA sensor, which was readily prepared by screen printing, exhibited a
turn-on emission property s amine vapours. Consequently, we believed
that the demonstrated strategy based on the multifarious non-
equilibrated excited states can be utilised for the development of novel
Ex-De fluorescent materials for chemical sensors as well as for anti-
counterfeiting applications.
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Acknowledgements
This work was supported by the National Natural Science Foundation
of China (21875219 and 51803056), the Natural Science Foundation of
Zhejiang Province (LY17E030001, LY17F050001and LQ18E030002)
and the Open Fund of State Key Laboratory of Luminescent Materials
and Devices (SCUT) (2018-skllmd-14). W.-Y.W. thanks the Hong
Kong Research Grants Council (C6009-17G), the Areas of Excellence
Scheme of HKSAR (AoE/P-03/08), the Clarea Au Endowed
Professorship in Energy (847S) and the Hong Kong Polytechnic
University (1-ZE1C) for the financial support.
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Keywords: excitation-dependent fluorescence • ESIPT • triazole
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•
excimer • anti-counterfeiting
Conflict of interest
The authors declare no conflict of interest.
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