期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202200337
关键词
Multiple Resonance Effect; Narrowband Emission; Organic Light-Emitting Diodes; Polycyclic Aromatic Hydrocarbon; Thermally Activated Delayed fluorescence
资金
- National Key RAMP
- D Program of China [2020YFA0714601]
- National Natural Science Foundation of China [21935005, 52173165]
- Natural Science Foundation of Chongqing, China [cstc2021jcyj-msxmX0274, X190321TF190]
In this study, a ternary boron-oxygen-nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR-TADF) properties, named DBNO, was developed. The designed molecule exhibits a vivid green emission with high photoluminescence quantum yield and an extremely narrow full width at half maximum. The organic light-emitting diode (OLED) based on DBNO shows significantly improved device performance with a narrowband green emission and high external quantum efficiency achieved through the TADF-sensitization mechanism.
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-pi-boron and para oxygen-pi-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 %.
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