期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202201965
关键词
Boron; Fluorescence; Natural Orbital Analysis; Organic Light-Emitting Diodes; pi-Radicals
资金
- MEXT/JSPS KAKENHI [JP18H03909, JP18H05261, JP20K05430, JP21H01881, JP21K18931]
- CREST, Japan Science and Technology Agency (JST) [JPMJCR2105]
- JSPS
- MEXT (WISE Program)
- World Premier International Research Center (WPI) Initiative, Japan
We report on a new class of emissive and stable pi-radicals containing a boron atom, which exhibit unique fluorescence properties and potential applications in organic light-emitting diodes.
We report on the fluorescence properties of a new class of emissive and stable pi-radicals that contain a boron atom at a position distant from the radical center. A fully planarized derivative exhibited an intense red fluorescence with high fluorescence quantum yields (Phi(F) > 0.67) even in polar solvents. To elucidate the origin of this phenomenon, we synthesized another boron-stabilized radical that contains a bulky aryl group on the boron atom. A comparison of these derivatives, as well as with conventional donor-rr-acceptor (D-pi-A)-type emissive pi-radicals, unveiled several characteristic features in their photophysical properties. A theoretical analysis revealed that the SOMO-LUMO electronic transition generates an emissive D-1 state. Unlike conventional D-pi-A-type pi-radicals, this state does not undergo significant structural relaxation. The boron-stabilized pi-radicals demonstrated promising potential for organic light-emitting diodes as an emitting material.
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