Interestingly, a dual-emission band appears on the delayed PL spectrum of p-ClTPA, which is redshifted ~ 10 nm from the emission band on the prompt PL spectrum. Moreover, different milliseconds lifetimes are estimated for the two peaks composing of the dual-emission band (0.81 ms@470 nm and 1.23 ms@535 nm), indicating that this dual-emission band could be ascribed to the dual-RTP originated from the radiative decays of different triplet states (e.g., T1