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Simultaneous control of carrier transport and film polarization of emission layers aimed at high-performance OLEDs

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Listed:
  • Masaki Tanaka

    (Tokyo University of Agriculture and Technology)

  • Chin-Yiu Chan

    (Kyushu University)

  • Hajime Nakanotani

    (Kyushu University
    Kyushu University)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University)

Abstract

The orientation of a permanent dipole moment during vacuum deposition results in the occurrence of spontaneous orientation polarization (SOP). Previous studies reported that the presence of SOP in organic light-emitting diodes (OLEDs) lowers electroluminescence efficiency because electrically generated excitons are seriously quenched by SOP-induced accumulated charges. Thus, the SOP in a host:guest-based emission layer (EML) should be finely controlled. In this study, we demonstrate the positive effect of dipole-dipole interactions between polar host and polar emitter molecules on the OLED performance. We found that a small-sized polar host molecule that possesses both high molecular diffusivities and moderate permanent dipole moment, well cancels out the polarization formed by the SOP of the emitter molecules in the EML without a disturbance of the emitter molecules’ intrinsic orientation, leading to high-performance of OLEDs. Our molecular design strategy will allow emitter molecules to pull out the full potential of the EMLs in OLEDs.

Suggested Citation

  • Masaki Tanaka & Chin-Yiu Chan & Hajime Nakanotani & Chihaya Adachi, 2024. "Simultaneous control of carrier transport and film polarization of emission layers aimed at high-performance OLEDs," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50326-9
    DOI: 10.1038/s41467-024-50326-9
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    References listed on IDEAS

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    1. Takahiko Yamanaka & Hajime Nakanotani & Chihaya Adachi, 2019. "Slow recombination of spontaneously dissociated organic fluorophore excitons," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
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