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Molecular Design of Non‐doped OLEDs Based on a Twisted Heptagonal Acceptor: A Delicate Balance between Rigidity and Rotatability
Author(s) -
Huang Zhenmei,
Bin Zhengyang,
Su Rongchuan,
Yang Feng,
Lan Jingbo,
You Jingsong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201915397
Subject(s) - oled , intermolecular force , intramolecular force , quantum efficiency , materials science , quantum yield , stacking , acceptor , photochemistry , electroluminescence , rigidity (electromagnetism) , quenching (fluorescence) , crystallography , optoelectronics , chemistry , fluorescence , nanotechnology , molecule , stereochemistry , organic chemistry , physics , layer (electronics) , quantum mechanics , condensed matter physics , composite material
Abstract The development of efficient non‐doped organic light‐emitting diodes (OLEDs) is highly desired but very challenging because of a severe aggregation‐caused quenching effect. Herein, we present a heptagonal diimide acceptor (BPI), which can restrict excessive intramolecular rotation and inhibit close intermolecular π–π stacking due to well‐balanced rigidity and rotatability of heptagonal structure. The BPI‐based luminogen ( DMAC‐BPI ) shows significant aggregation‐induced delayed florescence with an extremely high photoluminescence quantum yield (95.8 %) of the neat film, and the corresponding non‐doped OLEDs exhibit outstanding electroluminescence performance with maximum external quantum efficiency as high as 24.7 % and remarkably low efficiency roll‐off as low as 1.0 % at 1000 cd m −2 , which represents the state‐of‐the‐art performance for non‐doped OLEDs. In addition, the synthetic route to DMAC‐BPI is greatly streamlined and simplified through oxidative Ar−H/Ar−H homo‐coupling reaction.