fig4

Figure 4. (A) Schematic illustration of AIE fluorescence turn-on via coordination in the rigid MOF matrix of TCPE-Zn/Cd^[30,36], Copyright 2011,2012 American Chemical Society; (B) PCN-94 constructed by rigidifying H₄ETTC into the MOF matrix and their PLQY^[72], Copyright 2014, American Chemical Society; (C) Molecular structure and design features of H₈TDPEPE and the shortest chromophore-chromophore contacts of the MOF^[31], Copyright 2012, American Chemical Society; (D) Single- and two-photon absorption dual-way excited white-light emission in dye@LIFM-WZ-6 systems^[190], Copyright 2019, Wiley-VCH; (E) Estimated HOMO–LUMO energy gaps of the ligands^[74], Copyright 2015, Royal Society of Chemistry; (F) PL images and wavelength shift of lasing modes in the TPBE-Cd microwire under alternate exposure to air and acetone^[150], Copyright 2019, American Chemical Society. AIE: Aggregation-induced emission; MOF: metal–organic framework; TCPE: tetrakis(4-carboxyphenyl)ethylene; PCN: porous coordination network; H₄ETTC: 4’,4’’’,4’’’’’,4’’’’’’’-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1’-biphenyl]-4-carboxylic acid)); PLQY: photoluminescence quantum yield; H₈TDPEPE: tetrakis[4-(3,5-dicarboxyphenylethynyl)phenyl]ethylene; LIFM: Lehn Institute of Functional Materials; HOMO: highest occupied molecular orbital; LUMO: lowest unoccupied molecular orbital; PL: photoluminescence; TPBE: 1,1,2,2-tetrakis(4’-(pyridin-4-yl)-[1,1’-biphenyl]-4-yl)ethene; TPE: tetraphenylethylene; OPA: one-photon absorption; TPA: two-photon absorption.