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URN to cite this document: urn:nbn:de:bvb:703-epub-9181-0
Title data
Saxena, Rishabh ; Cotelli, Giacomo ; Stavrou, Kleitos ; Torun, Engin ; Franca, Larissa G. ; Monkman, Andrew P. ; Gottardi, Stefano ; Köhler, Anna:
Sweet spot of energy-level alignment in hyperfluorescent organic light-emitting diodes.
In: Physical Review Applied.
Vol. 24
(2025)
.
- 024064.
ISSN 2331-7019
DOI der Verlagsversion: https://doi.org/10.1103/k967-sr56
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Project information
| Project title: |
Project's official title Project's id Magnetresonanz-Techniken zur Untersuchung von Solarmaterialien 446281755 Open Access Publizieren No information |
|---|---|
| Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract
We investigate loss mechanisms in hyperfluorescent organic light-emitting diodes (HF-OLEDs) with the emissive layer consisting of a host, a thermally activated delayed fluorescence (TADF) sensitizer, and a terminal emitter. We focus on understanding how the relative energy levels between the TADF sensitizer and terminal emitter impact device efficiency and roll-off through the formation and subsequent dissociation of an intermolecular state. Using a combined experimental and kinetic Monte Carlo (KMC) simulation-based approach, we analyzed HF-OLEDs incorporating either multiresonant (MR) or fluorescent (non-MR) terminal emitters. We find that selecting terminal emitters with ionization potential and electron affinity values that position the intermolecular state at least 150 meV above the singlet energy of the terminal emitter effectively suppresses the losses due to exciton dissociation. Furthermore, we show that using the MR emitter, which exhibits reverse intersystem crossing (RISC), significantly reduces residual triplet-related losses compared with the non-MR emitter. This further mitigates exciton dissociation losses, thereby improving the external quantum efficiency (EQE). These findings provide clear guidelines for selecting terminal emitters and optimizing energy level alignment to address intermolecular state-related loss pathways in HF-OLEDs.
Further data
| Item Type: | Article in a journal |
|---|---|
| DDC Subjects: | 500 Science > 530 Physics |
| Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler Faculties Faculties > Faculty of Mathematics, Physics und Computer Science |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-9181-0 |
| Date Deposited: | 11 May 2026 11:44 |
| Last Modified: | 11 May 2026 11:45 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/9181 |
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