Triphenylamine‐Functionalized Multiple‐Resonance TADF Emitters with Accelerated Reverse Intersystem Crossing and Aggregation‐Induced Emission Enhancement for Narrowband OLEDs

Abstract Multiple‐resonance (MR) thermal activated delayed fluorescence (TADF) emitters have attracted increasing attention in organic electroluminescence devices, owing to their superior quantum efficiency and narrowband emission for high color purity. However, MR‐TADF materials often suffer from severe aggregation‐caused quenching (ACQ) and efficiency roll‐off problems due to their rigid planar structures and the lack of sufficient charge‐transfer (CT) characters with inefficient reverse intersystem crossing (RISC). Herein, by attaching electron‐rich triphenylamine (TPA) with twisted spatial conformation to the MR framework, two efficient narrowband MR‐TADF emitters, namely BNCz‐pTPA and BNCz‐mTPA , are…

• NN
  National Natural Science Foundation of China

  Awards: 52003058, 2019B1515120023, 21975053, U22A20399, 21975055, 2019B030301003, 2019B1515120035, U2001222, 52003059
• NS
  Natural Science Foundation of Guangdong Province

  Awards: 2019B030301003, 2022A1515010315
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Awards: 2019B030301003, 2019B1515120035, 2022A1515010315, 2021A1515010607, 2019B1515120023