外围重原子修饰策略实现高性能纯绿色电致发光，外量子效率超过 40%。
Peripherally Heavy-Atom-Decorated Strategy Towards High-Performance Pure Green Electroluminescence with External Quantum Efficiency over 40 .
机构信息
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
College of Physics and Optoeletronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2023 May 2;62(19):e202302478. doi: 10.1002/anie.202302478. Epub 2023 Apr 4.
Heavy-atom integration into thermally activated delayed fluorescence (TADF) molecule could significantly promote the reverse intersystem crossing (RISC) process. However, simultaneously achieving high efficiency, small roll-off, narrowband emission and good operational lifetime remains a big challenge for the corresponding organic light-emitting diodes (OLEDs). Herein, we report a pure green multi-resonance TADF molecule BN-STO by introducing a peripheral heavy atom selenium onto the parent BN-Cz molecule. The organic light-emitting diode device based on BN-STO exhibited state-of-the-art performance with a maximum external quantum efficiency (EQE) of 40.1 %, power efficiency (PE) of 176.9 lm W , well-suppressed efficiency roll-off and pure green gamut. This work reveals a feasible strategy to reach a balance between fast RISC process and narrow full width at half maximum (FWHM) of MR-TADF by heavy atom effect.
重原子整合到热激活延迟荧光（TADF）分子中可以显著促进反向系间窜越（RISC）过程。然而，对于相应的有机发光二极管（OLED），同时实现高效率、小滚降、窄带发射和良好的工作寿命仍然是一个巨大的挑战。在此，我们通过在母体 BN-Cz 分子上引入外围重原子硒，报道了一种纯绿色多共振 TADF 分子 BN-STO。基于 BN-STO 的有机发光二极管器件表现出了最先进的性能，最大外量子效率（EQE）为 40.1%，功率效率（PE）为 176.9 lm W，效率滚降得到了很好的抑制，并且色域为纯绿色。这项工作揭示了通过重原子效应在快速 RISC 过程和窄的半最大值全宽（FWHM）之间达到平衡的可行策略。
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