Li Huanhuan, Zhi Yibin, Dai Yizhong, Jiang Yunbo, Yang Qingqing, Li Mingguang, Li Ping, Tao Ye, Li Hui, Huang Wei, Chen Runfeng
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China.
Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, China.
Front Chem. 2020 Feb 26;8:49. doi: 10.3389/fchem.2020.00049. eCollection 2020.
The exploitation of thermally activated delayed fluorescence (TADF) emitters with aggregation-induced emission is highly prerequisite for the construction of highly efficient electroluminescent devices in materials science. Herein, two asymmetric TADF emitters of and with charming aggregation-induced emission are expediently designed and prepared based on highly twisted strong electron-withdrawing acceptor (A) of sulfurafluorene ()-modified ketone () and arylamine donor (D) in D-A-D architecture by simple synthetic procedure in high yields. High photoluminescence quantum yields up to 73% and small singlet-triplet splitting of 0.03 eV; short exciton lifetimes are obtained in the resultant molecules. Strikingly, efficient non-doped and doped TADF organic light-emitting diodes (OLEDs) facilitated by these emitters show high luminance of 5,598 and 11,595 cd m, current efficiencies (CEs) of 16.8 and 35.6 cd/A, power efficiencies (PEs) of 9.1 and 29.8 lm/W, and external quantum efficiencies (EQEs) of 7.5 and 15.9%, respectively. This work furnishes a concrete instance in exploring efficient TADF emitter, which is highly conducive and encouraging in stimulating the development of TADF OLEDs with high brightness and excellent efficiencies simultaneously.
利用具有聚集诱导发光特性的热激活延迟荧光（TADF）发光体是材料科学中构建高效电致发光器件的高度前提条件。在此，基于硫芴（）修饰的酮（）的高度扭曲强吸电子受体（A）和D-A-D结构中的芳胺供体（D），通过简单的合成步骤，以高产率方便地设计并制备了两种具有迷人聚集诱导发光特性的不对称TADF发光体。所得分子具有高达73%的高光致发光量子产率和0.03 eV的小单重态-三重态分裂；激子寿命较短。引人注目的是，由这些发光体促进的高效非掺杂和掺杂TADF有机发光二极管（OLED）分别显示出5598和11595 cd/m的高亮度、16.8和35.6 cd/A的电流效率（CE）、9.1和29.8 lm/W的功率效率（PE）以及7.5和15.9%的外量子效率（EQE）。这项工作为探索高效TADF发光体提供了一个具体实例，这对于同时刺激具有高亮度和优异效率的TADF OLED的发展极具促进作用且令人鼓舞。
