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- Title
Achieving 37.1% Green Electroluminescent Efficiency and 0.09 eV Full Width at Half Maximum Based on a Ternary Boron‐Oxygen‐Nitrogen Embedded Polycyclic Aromatic System.
- Authors
Cai, Xinliang; Xue, Jianan; Li, Chenglong; Liang, Baoyan; Ying, Ao; Tan, Yao; Gong, Shaolong; Wang, Yue
- Abstract
Herein, a ternary boron‐oxygen‐nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR‐TADF), namely DBNO, is developed by adopting the para boron‐π‐boron and para oxygen‐π‐oxygen strategy. The designed molecule presents a vivid green emission with a high photoluminescence quantum yield (96 %) and an extremely narrow full width at half maximum (FWHM) of 19 nm/0.09 eV, which surpasses all previously reported green TADF emitters to date. In addition, the long molecular structure along the transition dipole moment direction endows it with a high horizontal emitting dipole ratio of 96 %. The organic light‐emitting diode (OLED) based on DBNO reveals a narrowband green emission with a peak at 504 nm and a FWHM of 24 nm/0.12 eV. Particularly, a significantly improved device performance is achieved by the TADF‐sensitization (hyperfluorescence) mechanism, presenting a FWHM of 27 nm and a maximum external quantum efficiency (EQE) of 37.1 %.
- Subjects
POLYCYCLIC aromatic hydrocarbons; LIGHT emitting diodes; QUANTUM efficiency; ENVIRONMENTAL reporting; DIPOLE moments; ELECTROLUMINESCENCE
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 23, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202200337