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. 2023 Jun 23;14:3765. doi: 10.1038/s41467-023-39402-8

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — a Emission spectra of TTA-SPDFP COF before (black) and after (red) photoirradiation, revealing significant emission intensity enhancement upon exposure to UV light for one hour. The spectra were recorded at room temperature with an excitation wavelength of 365 nm. b UV light induced visual emission color changes for TTA-SPDFP COF (left) and TTA-MCDFP COF (right) dispersions in ethanol. The process is not reversible with visible light. c, d HRTEM images of TTA-SPDFP/MCDFP COF and e SAED pattern of TTA-MCDFP COF. f Chemical structures (top) and photographs (bottom) depicting the reversible protonation and deprotonation of TTA-MCDFP COF powder in the presence of gaseous HCl and NH₃. g UV-vis absorbance spectral changes of TTA-MCDFP COF dispersed in water.