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Emission and Absorption Tuning in TADF B,N‐Doped Heptacenes: Toward Ideal‐Blue Hyperfluorescent OLEDs

Stavrou, Kleitos; Madayanad Suresh, Subeesh; Hall, David; Danos, Andrew; Kukhta, Nadzeya A.; Slawin, Alexandra M.Z.; Warriner, Stuart; Beljonne, David; Olivier, Yoann; Monkman, Andrew; Zysman‐Colman, Eli

Emission and Absorption Tuning in TADF B,N‐Doped Heptacenes: Toward Ideal‐Blue Hyperfluorescent OLEDs Thumbnail


Authors

Subeesh Madayanad Suresh

David Hall

Nadzeya A. Kukhta

Alexandra M.Z. Slawin

Stuart Warriner

David Beljonne

Yoann Olivier

Eli Zysman‐Colman



Abstract

Developing high-efficiency purely organic blue organic light-emitting diodes (OLEDs) that meet the stringent industry standards is a major current research challenge. Hyperfluorescent device approaches achieve in large measure the desired high performance by combining the advantages of a high-efficiency thermally activated delayed fluorescence (TADF) assistant dopant with a narrowband deep-blue multi-resonant TADF (MR-TADF) terminal emitter. However, this approach requires suitable spectral overlap to support Förster resonance energy transfer (FRET) between the two. Here, a color tuning of a recently reported MR-TADF B,N-heptacene core through control of the boron substituents is demonstrated. While there is little impact on the intrinsic TADF properties—as both singlet and triplet energies decrease in tandem—this approach improves the emission color coordinate as well as the spectral overlap for blue hyperfluorescence OLEDs (HF OLEDs). Crucially, the red-shifted and more intense absorption allows the new MR-TADF emitter to pair with a high-performance TADF assistant dopant and achieve maximum external quantum efficiency (EQEmax) of 15% at color coordinates of (0.15 and 0.10). The efficiency values recorded for the device at a practical luminance of 100 cd m–2 are among the highest reported for HF TADF OLEDs with CIEy ≤ 0.1.

Citation

Stavrou, K., Madayanad Suresh, S., Hall, D., Danos, A., Kukhta, N. A., Slawin, A. M., …Zysman‐Colman, E. (2022). Emission and Absorption Tuning in TADF B,N‐Doped Heptacenes: Toward Ideal‐Blue Hyperfluorescent OLEDs. Advanced Optical Materials, 10(17), Article 2200688. https://doi.org/10.1002/adom.202200688

Journal Article Type Article
Online Publication Date Jun 14, 2022
Publication Date Sep 5, 2022
Deposit Date Jun 29, 2022
Publicly Available Date Feb 3, 2023
Journal Advanced Optical Materials
Electronic ISSN 2195-1071
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 10
Issue 17
Article Number 2200688
DOI https://doi.org/10.1002/adom.202200688

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.







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