To achieve an excellent fluorescence material, we introduced the carbazole-based derivative, 4,4´,4´´,4´´´-([9,9´-bicarbazole]-3,3´,6,6´-tetrayl)tetrabenzaldehyde (BCTB-4CHO, Fig. ), as a planar four-connected building block. Due to the attractive rich electron properties and high chemical stability, carbazolyl and its derivatives have been widely used as famous chromophores. Furthermore, 1,4phenylenediacetonitrile (PDAN, Fig. ) was chosen as a linear linker, a typical building unit for the formation of C=C bonds. We thus developed a novel sp 2 carbon-linked COF (JUC-557) with sql topology and microporous channels of 1.9 nm (Fig. ). Notably, the inherent sp 2 C=C linkages simultaneously improve both in-plane π-electron delocalization and the chemical stability of COF materials. More importantly, after the construction of JUC-557, a typical AIE functional moiety, phenyl ethylene (PE) group, was formed in the framework (Fig. ). Therefore, a novel two-dimensional fluorescence material, JUC-557, was successfully established based on the combination of characteristic of ACQ-and AIEbased fluorophores, making it a promising fluorescent material (Fig. ).