It is noteworthy that the ΔEST of oBFCzTRZ is only 0.002 eV, while those of mBFCzTRZ and pBFCzTRZ are 0.191 and 0.302 eV, respectively, revealing the much weaker electronic coupling within the former. Moreover, oBFCzTRZ (FPL: 97.9%; τd: 5.4 µs in 10 wt% in DPEPO) also possessed a shorter delayed lifetime, and higher FPL than mBFCzTRZ (FPL: Expanding on the ortho-disposed donor-acceptor platform, Lee et al. reported green TADF emitters DPA-o-TRZ and MPA-o-TRZ (Figure ), which incorporated a diphenylamine group whose electron donating ability is stronger than benzoflurocarbazole as in oBFCzTRZ. noncovalent interactions. Reproduced with permission. Copyright © 2019, American Chemical Society.