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Carbazole‐Based DABNA Analogues as Highly Efficient Thermally Activated Delayed Fluorescence Materials for Narrowband Organic Light‐Emitting Diodes
Author(s) -
Oda Susumu,
Kumano Wataru,
Hama Toshiki,
Kawasumi Ryosuke,
Yoshiura Kazuki,
Hatakeyama Takuji
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202012891
Subject(s) - carbazole , photochemistry , regioselectivity , oled , fluorescence , diode , materials science , narrowband , optoelectronics , chemistry , nanotechnology , organic chemistry , catalysis , optics , physics , layer (electronics)
Carbazole‐based DABNA analogues ( CzDABNA s) 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 CzDABNA s, 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.