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

Author

Listed:
  • Monirul Hasan

    (The University of Queensland
    The University of Queensland)

  • Siddhartha Saggar

    (The University of Queensland
    The University of Queensland)

  • Atul Shukla

    (The University of Queensland
    The University of Queensland)

  • Fatima Bencheikh

    (Kyushu University)

  • Jan Sobus

    (The University of Queensland
    The University of Queensland)

  • Sarah K. M. McGregor

    (The University of Queensland
    The University of Queensland)

  • Chihaya Adachi

    (Kyushu University)

  • Shih-Chun Lo

    (The University of Queensland
    The University of Queensland)

  • Ebinazar B. Namdas

    (The University of Queensland
    The University of Queensland)

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

Suggested Citation

  • Monirul Hasan & Siddhartha Saggar & Atul Shukla & Fatima Bencheikh & Jan Sobus & Sarah K. M. McGregor & Chihaya Adachi & Shih-Chun Lo & Ebinazar B. Namdas, 2022. "Probing polaron-induced exciton quenching in TADF based organic light-emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-021-27739-x
    DOI: 10.1038/s41467-021-27739-x
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    Cited by:

    1. Xun Tang & Tuul Tsagaantsooj & Tharindu P. B. Rajakaruna & Kai Wang & Xian-Kai Chen & Xiao-Hong Zhang & Takuji Hatakeyama & Chihaya Adachi, 2024. "Stable pure-green organic light-emitting diodes toward Rec.2020 standard," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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