Highly Efficient Aggregation‐induced Electrochemiluminescence Performance of Covalent Organic Frameworks with Electron‐rich Conjugated Structures

Abstract Since aggregation‐induced electrochemiluminescence (AIECL) luminophore overcomes the restriction of aggregation‐caused quenching in solid luminescent materials, AIECL luminophore has become a promising material in the field of electrochemiluminescence (ECL) engineering. However, the lack of ECL emitters with high AIECL performance limits its wide application. Herein, imine‐linked covalent organic frameworks (COFs) with C 4 symmetrical tetraphenyl ethylene and C 2 symmetrical five‐membered heteroaromatic monomers are designed as ECL emitter in aqueous media. Significantly, the ECL intensity of COFs with terthienyl units (TTA‐TAPE) is 206 times that of COFs with furan units in the presence of tri‐n‐propylamine (TPrA), which is the result of enhancing ECL signals by increasing the thiophene units and π‐π conjugation of COFs. Furthermore, the ECL mechanism of these COFs is vested in the bandgap model. Thus, the study provides a strategy for designing highly efficient ECL‐active COFs emitters with excellent AIECL efficiency.