题目：

Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100% Internal Quantum Efficiency

作者：

Jia-Xiong Chen^1,2,3, Wen-Wen Tao¹, Wen-Cheng Chen², Ya-Fang Xiao², Kai Wang^1,*, Chen Cao², Jia Yu¹, Shengliang Li², Feng-Xia Geng³, Chihaya Adachi⁴, Chun-Sing Lee^2,*, and Xiao-Hong Zhang^1,*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu, Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, P. R. China

²Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong Hong Kong SAR (P. R. China)

³College of Chemistry, Chemical Engineering and Materials Science Soochow University, Suzhou 215123 (P. R. China)

⁴Department of Applied Chemistry, Center for Organic Photonics and Electronics Research (OPERA), Kyushu University 744 Motooka, Nishi, Fukuoka 819-0395 (Japan)

摘要：

Developing red thermally activated delayed fluorescence (TADF) emitters, attainable for both high-efficient red organic light-emitting diodes (OLEDs) and non-doped deep red/near-infrared (NIR) OLEDs, is challenging. Now, two red emitters, BPPZ-PXZ and mDPBPZ-PXZ, with twisted donor–acceptor structures were designed and synthesized to study molecular design strategies of high-efficiency red TADF emitters. BPPZ-PXZ employs the strictest molecular restrictions to suppress energy loss and realizes red emission with a photoluminescence quantum yield (FPL) of 100 ± 0.8% and external quantum efficiency (EQE) of 25.2% in a doped OLED. Its non-doped OLED has an EQE of 2.5% owing to unavoidable intermolecular π–πinteractions. mDPBPZ-PXZ releases two pyridine substituents from its fused acceptor moiety. Although mDPBPZ-PXZ realizes a lower EQE of 21.7% in the doped OLED, its non-doped device shows a superior EQE of 5.2% with a deep red/NIR emission at peak of 680 nm.

影响因子：

12.257

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/anie.201906575

责任编辑：朱文昌