Specifically, there is a good overlap between the emission spectra of S1 and T1 states in o-ClTPA while a remarkable redshift is occurred between the emission spectra of S1 and T1 states in m-ClTPA, further confirming their TADF and RTP properties in crystals, respectively. As for p-ClTPA, the dual-emission band composed of T2 and T1 states is slightly redshifted from the emission spectrum of the S1 state, which not only verifies its dual-RTP emission in the crystal state but also attributes the dual-RTP to the radiative transitions from the T2 and T1 states, respectively.