Azaborine as a Versatile Weak Donor for Thermally Activated Delayed Fluorescence.

Content Provider	Europe PMC
Author	Sudhakar, Pagidi Kuila, Suman Stavrou, Kleitos Danos, Andrew Slawin, Alexandra M. Z. Monkman, Andrew Zysman-Colman, Eli
Copyright Year	2023
Abstract	Extensive research has been devoted to the developmentof thermallyactivated delayed fluorescence emitters, especially those showingpure-blue emission for use in lighting and full-color display applications.Toward that goal, herein we report a novel weak donor, 1,4-azaborine(AZB), with complementary electronic and structural properties comparedto the widely used dimethylacridan (DMAC) or carbazole (Cz) donors.Coupled with a triazine acceptor, AZB-Ph-TRZ is the directstructural analogue of the high-performance and well-studied greenTADF emitter DMAC-TRZ and has ΔEST = 0.39 eV, a photoluminescence quantum yield (ΦPL) of 27%, and λPL = 415 nm in 10 wt % dopedmCP films. The shortened analogue AZB-TRZ possesses red-shiftedemission with a reduced singlet–triplet gap (ΔEST = 0.01 eV) and fast reverse intersystem crossing(kRISC of 5 × 106 s–1) in mCP. Despite a moderate ΦPL of34%, OLEDs with AZB-TRZ in mCP showed sky-blue emissionwith CIE1931(x,y) of (0.22,0.39) and amaximum external quantum efficiency (EQEmax) of 10.5%.Expanding the chemist’s toolkit for the design of blue donor–acceptorTADF materials will enable yet further advances in the future, asAZB is paired with a wider range of acceptor groups.
ISSN	19448244
Journal	ACS Applied Materials & Interfaces
Volume Number	15
PubMed Central reference number	PMC10236432
Issue Number	21
PubMed reference number	37199521
e-ISSN	19448252
DOI	10.1021/acsami.3c05409
Language	English
Publisher	American Chemical Society
Publisher Date	2023-05-18
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2023 The Authors. Published by American Chemical Society
Subject Keyword	azaborine donor thermally activated delayed fluorescence donor−acceptor triazine organic light-emittingdiodes
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Medicine Materials Science