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Purely organic electroluminescent material realizing 100% conversion from electricity to light

Author

Listed:
  • Hironori Kaji

    (Institute for Chemical Research, Kyoto University)

  • Hajime Suzuki

    (Institute for Chemical Research, Kyoto University)

  • Tatsuya Fukushima

    (Institute for Chemical Research, Kyoto University)

  • Katsuyuki Shizu

    (Institute for Chemical Research, Kyoto University
    Center for Organic Photonics and Electronics Research, Kyushu University)

  • Katsuaki Suzuki

    (Institute for Chemical Research, Kyoto University)

  • Shosei Kubo

    (Institute for Chemical Research, Kyoto University)

  • Takeshi Komino

    (Center for Organic Photonics and Electronics Research, Kyushu University)

  • Hajime Oiwa

    (Institute for Chemical Research, Kyoto University)

  • Furitsu Suzuki

    (Institute for Chemical Research, Kyoto University)

  • Atsushi Wakamiya

    (Institute for Chemical Research, Kyoto University)

  • Yasujiro Murata

    (Institute for Chemical Research, Kyoto University)

  • Chihaya Adachi

    (Center for Organic Photonics and Electronics Research, Kyushu University
    JST, ERATO, Adachi Molecular Exciton Engineering Project
    International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University)

Abstract

Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100% photoluminescence quantum yield and approximately 100% up-conversion of the triplet to singlet excited state. The material contains electron-donating diphenylaminocarbazole and electron-accepting triphenyltriazine moieties. The typical trade-off between effective emission and triplet-to-singlet up-conversion is overcome by fine-tuning the highest occupied molecular orbital and lowest unoccupied molecular orbital distributions. The nearly zero singlet–triplet energy gap, smaller than the thermal energy at room temperature, results in an organic light-emitting diode with external quantum efficiency of 29.6%. An external quantum efficiency of 41.5% is obtained when using an out-coupling sheet. The external quantum efficiency is 30.7% even at a high luminance of 3,000 cd m−2.

Suggested Citation

  • Hironori Kaji & Hajime Suzuki & Tatsuya Fukushima & Katsuyuki Shizu & Katsuaki Suzuki & Shosei Kubo & Takeshi Komino & Hajime Oiwa & Furitsu Suzuki & Atsushi Wakamiya & Yasujiro Murata & Chihaya Adach, 2015. "Purely organic electroluminescent material realizing 100% conversion from electricity to light," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9476
    DOI: 10.1038/ncomms9476
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    Cited by:

    1. Alexander J. Gillett & Claire Tonnelé & Giacomo Londi & Gaetano Ricci & Manon Catherin & Darcy M. L. Unson & David Casanova & Frédéric Castet & Yoann Olivier & Weimin M. Chen & Elena Zaborova & Emrys , 2021. "Spontaneous exciton dissociation enables spin state interconversion in delayed fluorescence organic semiconductors," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    2. Junki Ochi & Yuki Yamasaki & Kojiro Tanaka & Yasuhiro Kondo & Kohei Isayama & Susumu Oda & Masakazu Kondo & Takuji Hatakeyama, 2024. "Highly efficient multi-resonance thermally activated delayed fluorescence material toward a BT.2020 deep-blue emitter," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Junyuan Liu & Yunhui Zhu & Taiju Tsuboi & Chao Deng & Weiwei Lou & Dan Wang & Tiangeng Liu & Qisheng Zhang, 2022. "Toward a BT.2020 green emitter through a combined multiple resonance effect and multi-lock strategy," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    4. Jianyu Zhang & Yujie Tu & Hanchen Shen & Jacky W. Y. Lam & Jianwei Sun & Haoke Zhang & Ben Zhong Tang, 2023. "Regulating the proximity effect of heterocycle-containing AIEgens," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    5. A. Lennart Schleper & Kenichi Goushi & Christoph Bannwarth & Bastian Haehnle & Philipp J. Welscher & Chihaya Adachi & Alexander J. C. Kuehne, 2021. "Hot exciplexes in U-shaped TADF molecules with emission from locally excited states," Nature Communications, Nature, vol. 12(1), pages 1-9, December.

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