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Asymmetric Spirobiacridine‐based Delayed Fluorescence Emitters for High‐performance Organic Light‐Emitting Devices
Author(s) -
Arai Hiroki,
Sasabe Hisahiro,
Tsuneyama Hisaki,
Kumada Kengo,
Kido Junji
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101188
Subject(s) - oled , quantum efficiency , acridine , optoelectronics , quantum yield , fluorescence , materials science , triazine , acceptor , photoluminescence , photochemistry , chemistry , optics , nanotechnology , physics , organic chemistry , layer (electronics) , condensed matter physics , polymer chemistry
Recently, researchers have focused on thermally activated delayed fluorescence (TADF) for efficient future lighting and displays. Among TADF emitters, a combination of triazine and acridine is a promising candidate for realizing high‐efficiency organic light‐emitting devices (OLEDs). However, simultaneous development of perfect horizontal orientation (Θ=100 %) and an external quantum efficiency (EQE) of over 40 % is still challenging. Here, to obtain insights for further improvements of a triazine/acridine combination, various asymmetric spirobiacridine (SBA)‐based TADF emitters with a unity photoluminescence quantum yield and high Θ ratio of over 80 % were developed. Furthermore, the substitution effects of the triazine acceptor unit on the photophysical properties were studied, including molecular orientations and OLED performance. The corresponding OLED exhibited sky‐blue emission with a high EQE of over 30 %.
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