Probing polaron-induced exciton quenching in TADF based organic light-emitting diodes

Polaron-induced exciton quenching in thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes (OLEDs) can lead to external quantum efficiency (EQE) roll-off and device degradation. In this study, singlet-polaron annihilation (SPA) and triplet-polaron annihilation (TPA) wer...

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Published in:Nature communications 2022-01, Vol.13 (1), p.254-254, Article 254
Main Authors: Hasan, Monirul, Saggar, Siddhartha, Shukla, Atul, Bencheikh, Fatima, Sobus, Jan, McGregor, Sarah K. M., Adachi, Chihaya, Lo, Shih-Chun, Namdas, Ebinazar B.
Format: Article
Language:English
Subjects:
639/301/1019
639/624/1020/1091
Degradation
Efficiency
Electric fields
Excitons
Fluorescence
Humanities and Social Sciences
Light emitting diodes
multidisciplinary
Organic light emitting diodes
Polarons
Power consumption
Quantum efficiency
Quenching
Recombination
Science
Science (multidisciplinary)
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Summary:Polaron-induced exciton quenching in thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes (OLEDs) can lead to external quantum efficiency (EQE) roll-off and device degradation. In this study, singlet-polaron annihilation (SPA) and triplet-polaron annihilation (TPA) were investigated under steady-state conditions and their relative contributions to EQE roll-off were quantified, using experimentally obtained parameters. It is observed that both TPA and SPA can lead to efficiency roll-off in 2,4,5,6-tetra(9 H -carbazol-9-yl)isophthalonitrile (4CzIPN) doped OLEDs. Charge imbalance and singlet-triplet annihilation (STA) were found to be the main contributing factors, whereas the device degradation process is mainly dominated by TPA. It is also shown that the impact of electric field-induced exciton dissociation is negligible under the DC operation regime (electric field
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-27739-x