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- Title
Molecular Design of Non‐doped OLEDs Based on a Twisted Heptagonal Acceptor: A Delicate Balance between Rigidity and Rotatability.
- Authors
Huang, Zhenmei; Bin, Zhengyang; Su, Rongchuan; Yang, Feng; Lan, Jingbo; You, Jingsong
- 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.
- Subjects
ORGANIC light emitting diodes; LIGHT emitting diodes; DELAYED fluorescence; ELECTROLUMINESCENCE; QUANTUM efficiency; PHOTOLUMINESCENCE
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 25, p10078
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201915397