Carbazole‐Based DABNA Analogues as Highly Efficient Thermally Activated Delayed Fluorescence Materials for Narrowband Organic Light‐Emitting Diodes

Carbazole‐based DABNA analogues (CzDABNAs) were synthesized from triarylamine by regioselective one‐shot single and double borylation. The reaction proceeded selectively at the ortho position of the carbazolyl group, where the highest occupied molecular orbital is mainly localized owing to the diffe...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-02, Vol.60 (6), p.2882-2886
Main Authors: Oda, Susumu, Kumano, Wataru, Hama, Toshiki, Kawasumi, Ryosuke, Yoshiura, Kazuki, Hatakeyama, Takuji
Format: Article
Language:English
Subjects:
borylation
Carbazole
Carbazoles
Emission spectra
Emissions
Emitters
Emitters (electron)
Fluorescence
Molecular orbitals
Narrowband
organic light-emitting diodes
organoboron
Spectral emittance
thermally activated delayed fluorescence
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Summary:Carbazole‐based DABNA analogues (CzDABNAs) were synthesized from triarylamine by regioselective one‐shot single and double borylation. The reaction proceeded selectively at the ortho position of the carbazolyl group, where the highest occupied molecular orbital is mainly localized owing to the difference in the electron‐donating abilities of the diarylamino and carbazolyl groups. The facile and scalable method enabled synthesis of CzDABNAs, exhibiting narrowband thermally activated delayed fluorescence with emission spectra ranging from deep blue to green. The organic light‐emitting diode devices employing these products as emitters exhibited deep‐blue, sky‐blue, and green emission with high external quantum efficiencies of 19.5, 21.8, and 26.7 %, respectively. Carbazole‐based DABNA analogues (CzDABNAs) were synthesized from triarylamine by regioselective one‐shot single and double borylation. The facile and scalable method enabled synthesis of CzDABNAs exhibiting narrowband thermally activated delayed fluorescence and the preparation of highly efficient organic light‐emitting diode devices showing deep‐blue, sky‐blue, and green emission.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202012891