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Full-color-tunable ultralong afterglow is significant for high-level information encryption. Herein, we report such an afterglow from a polymer synthesized via one-step anionic hybrid copolymerization of maleimide and N,N-dimethylaminopropylacrylamide. The polymer film exhibits an optimal delayed emission wavelength varying from 428 to 629 nm with a duration of afterglow of up to 4 s under ambient conditions. Particularly, the afterglow is pH-responsive. Our study reveals that the unique afterglow originates from the concurrence of three distinct delayed emission modes, i.e., persistent room-temperature phosphorescence, thermally activated delayed fluorescence, and delayed fluorescence through Förster-resonance energy transfer. This present study provides a facile approach to developing high-performance afterglow materials for information encryption and decryption.
Zuo et al. (2024) studied this question.
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