behavior resembling the flapping wings of a butterfly. Reproduced from Ref. with permission. Copyright (2021), Wiley-VCH GmbH. (b) Λ-type diazocineylene and its AIE curve. Reproduced from Ref. Reproduced from Ref. with permission. Copyright (2019), Wiley-VCH Verlag GmbH & Co. KGaA. (e)(f) Molecular structures of CPPTs-5b and CPPTs-12, which attribute to RIM mechanism, and the AIE phenomenon observed as the water content increases in THF/water mixtures. Reproduced from Ref. with permission. Copyright (2022), Wiley-VCH Verlag GmbH & Co. KGaA. Λ-type diazocineylene based on Tröger's base (TB) (Figure ) contains pyridinium salt also exhibits excellent AIE feature as well . Loose stacking caused by stereoisomerization and/or intrinsic vibrational motion can reduce distance-dependent intermolecular quenching, resulting in a strong fluorescence in the aggregated state. In subsequent work, Yuan designed an organic-inorganic hybrid solid with a core pyridine skeleton , containing an interpenetrating superstructure that also shows AIE characteristics.