These phenomena are indicative of typical twisted ICT (TICT) and AIE characteristics of these isomers, which is consistent with their twisted donor-acceptor structures. Meanwhile, the As for m-ClTPA, a remarkable redshift is occurred between the prompt and delayed PL spectra, which is indicative of typical RTP property. By fitting the prompt and delayed PL decay curves of isomers o-ClTPA and m-ClTPA, nanoseconds and milliseconds lifetimes are estimated for the prompt fluorescence and delayed fluorescence or phosphorescence, respectively (Figure and Figure ), further confirming their delayed fluorescence and RTP properties in crystals.