具有高效反向系统间交叉的三芳基硼烷基热激活延迟荧光材料

Applied Physics Express Pub Date : 2024-03-29 DOI:10.35848/1882-0786/ad392a

Ryosuke Okumura, Y. Kusakabe, Florian Rauch, Lukas Lubczyk, Katsuaki Suzuki, Todd Marder, Hironori Kaji

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引用次数: 0

摘要

高效的反向系统间交叉（RISC）是热激活延迟荧光（TADF）抑制有机发光二极管（OLED）效率衰减的一个重要过程。当电荷转移态之间发生 RISC 时，通过介导局部激发的三重态，增强自旋轨道耦合对快速 RISC 非常有效。在此，我们通过实验证实，在名为 Phox-Meπ、Phox-MeOπ 和 MeO3Ph-FMeπ 的三芳基硼烷基 TADF 发射器中发生了高效的 RISC。这三种发射器的 RISC 速率常数均超过 106 s-1。与基于 Phox-MeOπ 的 OLED（EQEmax = 6.7%）相比，基于 Phox-MeOπ 的 OLED 表现出更高的最大外部量子效率（EQEmax = 10.0%）。

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Triarylborane-based thermally activated delayed fluorescence materials with an efficient reverse intersystem crossing

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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Applied Physics Express

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