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Polyaniline-Based Conducting Polymer Compositions with a High Work Function for Hole-Injection Layers in Organic Light-Emitting Diodes: Formation of Ohmic Contacts

Authors

  • Mi-Ri Choi,

    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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    • These authors contributed equally to this work.

  • Seong-Hoon Woo,

    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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    • These authors contributed equally to this work.

  • Tae-Hee Han,

    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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  • Kyung-Geun Lim,

    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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  • Sung-Yong Min,

    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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  • Won Min Yun,

    1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea)
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  • Dr. Oh Kwan Kwon,

    1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea)
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  • Prof. Chan Eon Park,

    1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea)
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  • Kwan-Do Kim,

    1. National Center for Nanomaterials Technology, San 31 Hyoja-dong, Nam-gu, Pohang, Gyungbuk 790-784 (Korea)
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  • Dr. Hoon-Kyu Shin,

    1. National Center for Nanomaterials Technology, San 31 Hyoja-dong, Nam-gu, Pohang, Gyungbuk 790-784 (Korea)
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  • Dr. Myeong-Suk Kim,

    1. Samsung Mobile Displays, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712 (Korea)
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  • Dr. Taeyong Noh,

    1. Samsung Mobile Displays, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712 (Korea)
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  • Prof. Jong Hyeok Park,

    1. Department of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746 (Korea)
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  • Kyoung-Hwan Shin,

    1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742 (Korea)
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  • Jyongsik Jang,

    1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742 (Korea)
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  • Prof. Tae-Woo Lee

    Corresponding author
    1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
    • Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784 (Korea), Fax: (+82) 54-279-2399
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Abstract

It is a great challenge to develop solution-processed, polymeric hole-injection layers (HILs) that perform better than small molecular layers for realizing high-performance small-molecule organic light-emitting diodes (SM-OLEDs). We have greatly improved the injection efficiency and the current efficiency of SM-OLEDs by introducing conducting polymer compositions composed of polyaniline doped with polystyrene sulfonate and perfluorinated ionomer (PFI) as the HIL. During single spin-coating of conducting polymer compositions, the PFI layer was self-organized at the surface and greatly increased the film work function. It enhanced hole-injection efficiency and current efficiency by introducing a nearly ohmic contact and improving electron blocking. Our results demonstrate that solution-processed polyaniline HILs with tunable work functions are good candidates for reducing process costs and improving OLED performance.

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