Kleitos Stavrou kleitos.stavrou@durham.ac.uk
PGR Student Doctor of Philosophy
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
Authors
Subeesh Madayanad Suresh
David Hall
Dr Andrew Danos andrew.danos@durham.ac.uk
Senior Experimental Officer
Nadzeya A. Kukhta
Alexandra M.Z. Slawin
Stuart Warriner
David Beljonne
Yoann Olivier
Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor
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., Warriner, S., Beljonne, D., Olivier, Y., Monkman, A., & 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 |
Public URL | https://durham-repository.worktribe.com/output/1200959 |
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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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