“…22–27 The TPA was substituted at the ortho , meta , and para positions of BP, named o -TPA-BP, m -TPA-BP, and p -TPA-BP (Fig. 1a–c), to investigate their emission properties and excited state dynamics using photoluminescence (PL) spectroscopy, femtosecond/nanosecond transient absorption spectroscopy (fs-TA/ns-TA), 28,29 and theoretical calculations. 30–33 These results demonstrate that only p -TPA-BP presents hRISC-TADF features, which result from the enormous SOCME and small Δ E ST values to ensure efficient ISC and hRISC processes.…”