Iridium Complexes with Cyclometalated 2-Cycloalkenyl-Pyridine Ligands as Highly Efficient Emitters for Organic Light-Emitting Diodes

Authors

  • Dong Min Kang,

    1. School of Materials Science and Engineering and Engineering Research Institute (ERI) Gyeongsang National University Jinju, 660-701 (Korea)
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  • Jae-Wook Kang,

    1. Department of Surface Technology Korea Institute of Materials Science (KIMS) Changwon, 641-831 (Korea)
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  • Jong Won Park,

    1. School of Materials Science and Engineering and Engineering Research Institute (ERI) Gyeongsang National University Jinju, 660-701 (Korea)
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  • Sung Ouk Jung,

    1. School of Materials Science and Engineering and Engineering Research Institute (ERI) Gyeongsang National University Jinju, 660-701 (Korea)
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  • Se-Hyung Lee,

    1. Department of Materials and Science and Engineering and OLED Center Seoul National University Seoul, 151-744 (Korea)
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  • Hyung-Dol Park,

    1. Department of Materials and Science and Engineering and OLED Center Seoul National University Seoul, 151-744 (Korea)
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  • Yun-Hi Kim,

    1. Department of Chemistry Gyeongsang National University Jinju, 660-701 (Korea)
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  • Sung Chul Shin,

    Corresponding author
    1. Department of Chemistry Gyeongsang National University Jinju, 660-701 (Korea)
    • Department of Chemistry Gyeongsang National University Jinju, 660-701 (Korea).
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  • Jang-Joo Kim,

    Corresponding author
    1. Department of Materials and Science and Engineering and OLED Center Seoul National University Seoul, 151-744 (Korea)
    • Department of Materials and Science and Engineering and OLED Center Seoul National University Seoul, 151-744 (Korea).
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  • Soon-Ki Kwon

    Corresponding author
    1. School of Materials Science and Engineering and Engineering Research Institute (ERI) Gyeongsang National University Jinju, 660-701 (Korea)
    • School of Materials Science and Engineering and Engineering Research Institute (ERI) Gyeongsang National University Jinju, 660-701 (Korea).
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  • This work was supported by a Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-005-D00251), partially supported by the Strategic Technology Development Program (10030814), and partially supported by the Ministry of Commerce, Industries and Energy of Korea. D.M.K., J.W.P., and S.O.J. are grateful to the second stage of the BK21 program for supporting a fellowship.

Abstract

original image

Iridium complexes containing cyclometalated 2-cyclohexenylpyridine derivatives with rigid and bulky cyclohexene units are synthesized, and found to be highly efficient materials in EL devices (see figure). Devices based on these iridium complexes emit yellowish- green light with the very high external quantum efficiency of 18.7%.

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