Abstract
Abstract Efficient reverse intersystem crossing (RISC) is an important process for thermally activated delayed fluorescence (TADF) to suppress efficiency roll-off in organic light-emitting diodes (OLEDs). Enhancing spin-orbit coupling is effective for fast RISC, which is achieved by mediating a locally excited triplet state when RISC occurs between charge transfer states. Here, we experimentally confirmed that efficient RISC occurred in triarylborane-based TADF emitters named Phox-Meπ, Phox-MeOπ, and MeO3Ph-FMeπ. The three emitters showed large rate constants of RISC exceeding 106 s−1. Phox-Meπ-based OLEDs exhibited higher maximum external quantum efficiency (EQEmax = 10.0%) compared to Phox-MeOπ-based OLED (EQEmax = 6.7%).
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