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(A) Normalized (to the keto emission band, 525 nm) emission spectra of pellets compressed at different pressures (0, powder; 1, 1 ton; 2, 2 tons; 4, 4 tons; 10, 10 tons). The pictures are real photos of the UiO-66-(OH)2 pellets under daylight (left) and UV light (365 nm; right) irradiation. (B) Representation of the CIE coordinates of the pellets compressed at different pressures. (C) Proposed mechanism of mechanical compression detection by UiO-66-(OH)2 based on the ESIPT reaction.
