Intramolecular Sensitization Assisting High-Efficiency TADF Conjugated Polymers with Accelerating Exciton Spin Flip for Solution-Processed Electroluminescent Devices

• DOI: 10.1021/acs.macromol.4c00749
• Publication Date: 2024-05-23T07:50:56Z
• Authors: Shengyu Li; Yanchao Xie; Yuwei Yin; Jiazhou Chen; Yifei Cao; Shian Ying; Yuchao Liu; Zhongjie Ren; Shouke Yan

Thermally activated delayed fluorescence (TADF) conjugated polymers have attracted a lot of attention for their potential to produce flexible display devices. However, insufficient energy transfer from the host TADF units will result in exciton–exciton annihilation and reduced device efficiency. To address these problems, an intramolecular sensitization strategy is employed this work which spin flip triplet exciton can be accelerated by intermediation polymers. By regulating ratio each polymeric component, excellent photophysical properties achieved with photoluminescence quantum yield 86% high rate reverse intersystem crossing 6.3 × 105 s–1. Moreover, solution-processed polymer-based organic light-emitting diodes achieve attractive external efficiency 21.02% due effective utilization excitons. Overall, research validates feasibility restraining annihilation, thus providing promising pathway designing high-performance