Kleitos Stavrou kleitos.stavrou@durham.ac.uk
PGR Student Doctor of Philosophy
Key requirements for ultraefficient sensitization in hyperfluorescence organic light-emitting diodes
Stavrou, Kleitos; Franca, Larissa G.; Danos, Andrew; Monkman, Andrew P.
Authors
Larissa Gomes Franca larissa.gomes-franca@durham.ac.uk
PGR Student Doctor of Philosophy
Dr Andrew Danos andrew.danos@durham.ac.uk
Senior Experimental Officer
Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor
Abstract
Blue organic light-emitting diode (OLED) technology requires further advancements, and hyperfluorescent (HF) OLEDs have emerged as a promising solution to address stability and colour-purity concerns. A key factor influencing the performance of HF-OLEDs is Förster resonance energy transfer (FRET). Here we investigate the FRET mechanism in blue HF-OLEDs using contrasting thermally activated delayed fluorescence (TADF) sensitizers. We demonstrate that the molecular structure of the sensitizer profoundly impacts the FRET efficiency, exemplified by the spiro-linked TADF molecule ACRSA, which suppresses the dihedral-angle inhomogeneity and any lower-energy conformers that exhibit minimal FRET to the terminal emitter. Consequently, the FRET efficiency can be optimized to nearly 100%. Further, we demonstrate how the properties of a near-ideal sensitizer diverge from ideal TADF emitters. As a result, blue HF-OLEDs utilizing a greenish sensitizer exhibit a remarkable tripling of external quantum efficiency (~30%) compared with non-HF devices. This new understanding opens avenues for sensitizer design, indicating that green sensitizers can efficiently pump blue terminal emitters, thereby reducing device exciton energies and improving blue OLED stability.
Citation
Stavrou, K., Franca, L. G., Danos, A., & Monkman, A. P. (2024). Key requirements for ultraefficient sensitization in hyperfluorescence organic light-emitting diodes. Nature Photonics, 18(6), 554-561. https://doi.org/10.1038/s41566-024-01395-1
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 18, 2024 |
Online Publication Date | Feb 13, 2024 |
Publication Date | Jun 1, 2024 |
Deposit Date | Mar 21, 2024 |
Publicly Available Date | Mar 21, 2024 |
Journal | Nature Photonics |
Print ISSN | 1749-4885 |
Electronic ISSN | 1749-4893 |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 18 |
Issue | 6 |
Pages | 554-561 |
DOI | https://doi.org/10.1038/s41566-024-01395-1 |
Keywords | Atomic and Molecular Physics, and Optics; Electronic, Optical and Magnetic Materials |
Public URL | https://durham-repository.worktribe.com/output/2335249 |
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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
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