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Indolo[3,2,1-jk]carbazole-derived planar electron transport materials realizing high efficiency in green phosphorescent organic light-emitting diodes

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Abstract

Two novel electron transporting materials (ETMs), 2-(4,6-diphenyl-1,3,5-triazin-2-yl)indolo[3,2,1-jk]-carbazole (DPTrz-ICz) and 5,11-bis(4,6-diphenyl-1,3,5-tria-zin-2-yl)-2-phenylindolo[3,2,1-jk]carbazole (2DPTrz-ICz), were developed based on the indolo[3,2,1-jk]carbazole (ICz) core, combined with 2,4-diphenyl-1,3,5-triazine (DPTrz). The introduced ICz core in ETM exhibited enhanced intermolecular charge transport properties owing to its planar and rigid geometry and high triplet energy, demonstrating the potential of designing ETM. Consequently, 2DPTrz-ICz, featuring high triplet energy of 2.84 eV, effectively prevented triplet exciton quenching and showed increased electron mobility owing to the activation of intermolecular hop** charge transfer facilitated by stacking architecture. The two materials were utilized as ETMs in green phosphorescent organic light-emitting diodes. 2DPTrz-ICz exhibited a superior external quantum efficiency of 21.5%, higher than that of the spirobifluorene-derived ETM.

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Acknowledgements

This work was supported by Ministry of Trade, Industry and Energy (MOTIE) (20012622, P0017363).

Author information

Authors and Affiliations

  1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea

    Sejeong Um, Unhyeok Jo & Jun Yeob Lee

  2. SKKU Advanced Institute of Nano Technology, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea

    Jun Yeob Lee

  3. SKKU Institute of Energy Science and Technology, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea

    Jun Yeob Lee

Authors
  1. Sejeong Um
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  2. Unhyeok Jo
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  3. Jun Yeob Lee
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Contributions

Author contributions Um S designed and synthesized the materials; Jo U fabricated and evaluated the devices; Lee JY wrote the manuscript and supervised the research. All authors reviewed and approved the final manuscript.

Corresponding author

Correspondence to Jun Yeob Lee.

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Supplementary information Experimental details and supporting data are available in the online version of the paper.

Sejeong Um received her Bachelor’s degree in chemical engineering/polymer engineering from Sungkyunkwan University (2018–2022). After that, she earned her Master’s degree in chemical engineering from Sungkyunkwan University (2022–2023) by conducting the research on the design and synthesis of organic electronic materials for electron transport in organic light-emitting diodes.

Unhyeok Jo received his BSc degree from the Department of Semiconductor and Physical electronics, Sangji University, Republic of Korea. He is now a Master candidate at the Department of Chemical Engineering, Sungkyunkwan University, Republic of Korea. His main research areas are the development of exciton dynamics and emission mechanism for organic light-emitting diodes.

Jun Yeob Lee received his PhD degree from Seoul National University, Republic of Korea in 1998. After postdoc at Rensselaer Polytechnic Institute (1998–1999), he joined Samsung SDI and developed active matrix organic light-emitting diodes for six years. After that, he worked as a professor at the Department of Polymer Science and Engineering, Dankook University. He has been a professor at the School of Chemical Engineering, Sungkyunkwan University since 2015. His main research areas are the synthesis of organic electronic materials and development of novel device structures for organic electronic devices.

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Indolo[3,2,1-jk]carbazole-derived planar electron transport materials realizing high efficiency in green phosphorescent organic light-emitting diodes

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Um, S., Jo, U. & Lee, J.Y. Indolo[3,2,1-jk]carbazole-derived planar electron transport materials realizing high efficiency in green phosphorescent organic light-emitting diodes. Sci. China Mater. 66, 4437–4444 (2023). https://doi.org/10.1007/s40843-023-2595-8

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