| Autor: |
Natsuko Kanno, Yongxia Ren, Yu Kusakabe, Katsuaki Suzuki, Katsuyuki Shizu, Hiroyuki Tanaka, Yoshimasa Wada, Hiromichi Nakagawa, Jan Geldsetzer, Hironori Kaji |
| Rok vydání: |
2022 |
| Předmět: |
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| DOI: |
10.21203/rs.3.rs-2240047/v2 |
| Popis: |
Accelerating reverse intersystem crossing (RISC) without sacrificing fast radiative decay is effective in suppressing efficiency roll-off (eRO) in thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes. We here report a TADF emitter, CC-TXO-I, combining a bicarbazole donor (CC) and a sulfur-containing acceptor (TXO). The CC is used to accelerate radiative decay via moderate donor-acceptor torsion angle, and the TXO is expected to provide fast RISC by the heavy-atom effect. We realized very large rate constants of RISC (k RISCs) of ∼107 s−1. Both k RISCs and rate constants of radiative decay of CC-TXO-I increased with increasing doping concentration, resulting in improved eROs. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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