TPE-BBT is an AIE luminogen (AIEgen) showing ultrahigh PLQY. Its structure consists of a benzobisthiadiazole (BBT) electron acceptor, a bulky thiophene π bridge, and a tetraphenylethylene (TPE) electron donor (Figure ). TPE-BBT exhibits a significant AIE effect. The molecule exhibits only weak fluorescence when dissolved in the good solvent DMSO. However, upon formation of