一种四面体双吖啶供体可实现热激活延迟荧光发射体的快速辐射衰变。
A Tetrahedral Bisacridine Donor Enables Fast Radiative Decay in Thermally Activated Delayed Fluorescence Emitter.
作者信息
Pei Ranran, Xu Yulin, Miao Jingsheng, Peng Hao, Chen Zhanxiang, Zhou Changjiang, Liu He, Yang Chuluo
机构信息
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202217080. doi: 10.1002/anie.202217080. Epub 2023 Feb 16.
Achieving high efficiency and low efficiency roll-off simultaneously is of great significance for further application of thermally activated delayed fluorescent (TADF) emitters. A balance between radiative decay and reversed intersystem crossing must be carefully established. Herein, we propose a qunolino-acridine (QAc) donor composing two acridine with both planar (pAc) and bended (bAc) geometries. Combining with triazine, a TADF emitter QAc-TRZ is assembled. The pAc provides a well interaction with triazine which ensures a decent TADF behavior, while the bAc offers a delocalization of highest occupied molecular orbital (HOMO) which guarantees an enhancement of radiative decay. Remarkably, QAc-TRZ enables a highly efficient organic light emitting diode (OLED) with maximum external quantum efficiency (EQE) of 37.3 %. More importantly, the efficiencies under 100/1000 cd m stay 36.3 % and 31.7 %, respectively, and remain 21.5 % even under 10 000 cd m .
同时实现高效率和低效率滚降对于热激活延迟荧光（TADF）发光体的进一步应用具有重要意义。必须谨慎地在辐射衰减和反向系间窜越之间建立平衡。在此，我们提出一种喹啉 - 吖啶（QAc）供体，它由两个具有平面（pAc）和弯曲（bAc）几何结构的吖啶组成。与三嗪结合，组装成一个TADF发光体QAc - TRZ。平面吖啶（pAc）与三嗪提供良好的相互作用，确保了良好的TADF行为，而弯曲吖啶（bAc）则使最高占据分子轨道（HOMO）离域，保证了辐射衰减的增强。值得注意的是，QAc - TRZ能够实现高效有机发光二极管（OLED），其最大外量子效率（EQE）为37.3%。更重要的是，在100/1000 cd·m² 下的效率分别保持在36.3%和31.7%，即使在10000 cd·m² 下仍保持21.5%。
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