期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202207293
关键词
Boron-Nitrogen Covalent Bonds; Device Lifetime; High Efficiency; Multiple Resonance; Narrowband Emission
资金
- National Science Fund of China [22135004, 51903137, 61890942]
- National Key Basic Research and Development Program of China [2020YFA0715000, 2017YFA0204501]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-005]
- China Postdoctoral Science Foundation [2021M701865]
A new paradigm of easy-to-access multiple resonance emitter is constructed by simplifying the synthesis method and introducing an additional nitrogen atom. The proof-of-concept molecules exhibit narrowband emissions and high external quantum efficiencies, which are of great significance for emerging optoelectronic properties.
Despite the remarkable multiple resonance (MR) optoelectronic properties of organic nanographenes with boron and nitrogen atoms disposed para to each other, the synthetic procedures are sophisticated with low yields and the molecular skeletons are limited. Here, a new paradigm of easy-to-access MR emitter is constructed by simplifying the multiborylation through amine-directed formation of B-N bonds while introducing an additional para-positioned nitrogen atom to trigger the MR effect. The proof-of-concept molecules exhibit narrowband emissions at 480 and 490 nm, with full width at half maxima (FWHMs) of only 29 and 34 nm. The devices based on them showed external quantum efficiencies (EQE) of >33.0 %, which remained above 24.0 % even at a high brightness of 5000 cd m(-2). This is the first example of MR emitters with a B-N covalent bond, not only decreasing the synthesis difficulty but also increasing the diversity of MR skeletons for emerging new optoelectronic properties.
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