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陈嘉雄博士后的论文“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”发表在Angewandte Chemie International Edition 上

时间:2020-10-20关键词:张晓宏教授团队浏览量:51

Abstract:

 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.


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