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Triplet–triplet upconversion enhanced by spin–orbit coupling in organic light-emitting diodes

Author

Listed:
  • Ryota Ieuji

    (Kyushu University
    Kyushu University)

  • Kenichi Goushi

    (Kyushu University
    Kyushu University
    Kyushu University)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University
    Kyushu University)

Abstract

Triplet–triplet upconversion, in which two triplet excitons are converted to one singlet exciton, is a well-known approach to exceed the limit of electroluminescence quantum efficiency in conventional fluorescence-based organic light-emitting diodes. Considering the spin multiplicity of triplet pairs, upconversion efficiency is usually limited to 20%. Although this limit can be exceeded when the energy of a triplet pair is lower than that of a second triplet excited state, such as for rubrene, it is generally difficult to engineer the energy levels of higher triplet excited states. Here, we investigate the upconversion efficiency of a series of new anthracene derivatives with different substituents. Some of these derivatives show upconversion efficiencies close to 50% even though the calculated energy levels of the second triplet excited states are lower than twice the lowest triplet energy. A possible upconversion mechanism is proposed based on the molecular structures and quantum chemical calculations.

Suggested Citation

  • Ryota Ieuji & Kenichi Goushi & Chihaya Adachi, 2019. "Triplet–triplet upconversion enhanced by spin–orbit coupling in organic light-emitting diodes," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13044-1
    DOI: 10.1038/s41467-019-13044-1
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    Cited by:

    1. 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.
    2. Yanju Luo & Kai Zhang & Zhenming Ding & Ping Chen & Xiaomei Peng & Yihuan Zhao & Kuan Chen & Chuan Li & Xujun Zheng & Yan Huang & Xuemei Pu & Yu Liu & Shi-Jian Su & Xiandeng Hou & Zhiyun Lu, 2022. "Ultra-fast triplet-triplet-annihilation-mediated high-lying reverse intersystem crossing triggered by participation of nπ*-featured excited states," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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