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Stable pure-green organic light-emitting diodes toward Rec.2020 standard

Author

Listed:
  • Xun Tang

    (Kyushu University)

  • Tuul Tsagaantsooj

    (Kyushu University)

  • Tharindu P. B. Rajakaruna

    (Kyushu University)

  • Kai Wang

    (Soochow University)

  • Xian-Kai Chen

    (Soochow University)

  • Xiao-Hong Zhang

    (Soochow University)

  • Takuji Hatakeyama

    (Kyoto University)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University)

Abstract

Manipulating dynamic behaviours of charge carriers and excitons in organic light-emitting diodes (OLEDs) is essential to simultaneously achieve high colour purity and superior operational lifetime. In this work, a comprehensive transient electroluminescence investigation reveals that incorporating a thermally activated delayed fluorescence assistant molecule with a deep lowest unoccupied molecular orbital into a bipolar host matrix effectively traps the injected electrons. Meanwhile, the behaviours of hole injection and transport are still dominantly governed by host molecules. Thus, the recombination zone notably shifts toward the interface between the emissive layer (EML) and the electron-transporting layer (ETL). To mitigate the interfacial carrier accumulation and exciton quenching, this bipolar host matrix could serve as a non-barrier functional spacer between EML/ETL, enabling the distribution of recombination zone away from this interface. Consequently, the optimized OLED exhibits a low driving voltage, promising device stability (95% of the initial luminance of 1000 cd m−2, LT95 > 430 h), and a high Commission Internationale de L’Éclairage y coordinate of 0.69. This indicates that managing the excitons through rational energy level alignment holds the potential for simultaneously satisfying Rec.2020 standard and achieving commercial-level stability.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48659-6
    DOI: 10.1038/s41467-024-48659-6
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    References listed on IDEAS

    as
    1. Yifan Zhang & Jaesang Lee & Stephen R. Forrest, 2014. "Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    2. Sinyeong Jung & Wai-Lung Cheung & Si-jie Li & Min Wang & Wansi Li & Cangyu Wang & Xiaoge Song & Guodan Wei & Qinghua Song & Season Si Chen & Wanqing Cai & Maggie Ng & Wai Kit Tang & Man-Chung Tang, 2023. "Enhancing operational stability of OLEDs based on subatomic modified thermally activated delayed fluorescence compounds," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    3. 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.
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