题目：

Managing Locally Excited and Charge-Transfer Triplet States to Facilitate Up-Conversion in Red TADF Emitters That are Available for Both Vacuum- and Solution-Processes

作者：

Jia-Xiong Chen,^1,2,3 Ya-Fang Xiao,² Kai Wang,^1,* Dianming Sun,¹ Xiao-Chun Fan,¹ Xiang Zhang,¹ Ming Zhang,¹ Yi-Zhong Shi,¹ Jia Yu,¹ Feng-Xia Geng,³ 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 Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Soochow University, Suzhou 215123, P. R. China

摘要：

Developing red thermally activated delayed fluorescence (TADF) emitters for high-performance OLEDs is still facing great challenge. Herein, three red TADF emitters pDBBPZ-DPXZ, pDTBPZ-DPXZ and oDTBPZ-DPXZ are designed and synthesized with same donor-acceptor (D-A) backbone with different peripheral groups attaching on the A moieties. Their lowest triplet states change from locally excited to charge transfer character leading to significantly enhance reverse intersystem crossing process. In particular, oDTBPZ-DPXZ exhibits efficient TADF feature and exciton utilization. It not only achieves an external quantum efficiency (EQE) of 20.1% in red vacuum-processed OLED, but also realize a high EQE of 18.5% in a solution-processed OLED, which is among the best results in solution-processed red TADF OLEDs. This work provides an effective strategy for designing red TADF molecules by managing energy level alignments to facilitate the up-conversion process and thus enhance exciton harvesting.

影响因子：

12.257

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/anie.202012070