2023/02/01 by Ranran Pei, Yulin Xu, Jingsheng Miao +5 · 6 citations
Chemistry · Engineering · Materials Science · #Acridine #Atomic physics #Chemistry #Common emitter #Delocalized electron #Excited state #Fluorescence #Intersystem crossing #Luminescence and Fluorescent Materials #Materials science #Nanotechnology #OLED #Optics #Optoelectronics #Organic Electronics and Photovoltaics #Organic Light-Emitting Diodes Research #Photochemistry #Physics #Quantum efficiency #Radiative transfer #Triazine
paper · doi:10.1002/ange.202217080
published in Angewandte Chemie 135(13) (Wiley)
openalex publication_date 2023/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abstract Achieving high efficiency and low efficiency roll‐off simultaneously is of great significance for further application of thermally activated delayed fluorescent (TADF) emitters. A balance between radiative decay and reversed intersystem crossing must be carefully established. Herein, we propose a qunolino‐acridine (QAc) donor composing two acridine with both planar (pAc) and bended (bAc) geometries. Combining with triazine, a TADF emitter QAc‐TRZ is assembled. The pAc provides a well interaction with triazine which ensures a decent TADF behavior, while the bAc offers a delocalization of highest occupied molecular orbital (HOMO) which guarantees an enhancement of radiative decay. Remarkably, QAc‐TRZ enables a highly efficient organic light emitting diode (OLED) with maximum external quantum efficiency (EQE) of 37.3 %. More importantly, the efficiencies under 100/1000 cd m −2 stay 36.3 % and 31.7 %, respectively, and remain 21.5 % even under 10 000 cd m −2 .