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

Monirul Hasan, Siddhartha Saggar, Atul Shukla, Fatima Bencheikh, Jan Sobus, Sarah K. M. McGregor, Chihaya Adachi (), Shih-Chun Lo () and Ebinazar B. Namdas ()
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Monirul Hasan: The University of Queensland
Siddhartha Saggar: The University of Queensland
Atul Shukla: The University of Queensland
Fatima Bencheikh: Kyushu University
Jan Sobus: The University of Queensland
Sarah K. M. McGregor: The University of Queensland
Chihaya Adachi: Kyushu University
Shih-Chun Lo: The University of Queensland
Ebinazar B. Namdas: The University of Queensland

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract 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(9H-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

Date: 2022
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DOI: 10.1038/s41467-021-27739-x

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