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Enhanced performance in inverted organic light emitting diode assisted by an interlayer of crystalline and n-doped 1,4,5,8-naphthalene-tetracarboxylic-dianhydride

Authors

  • Dashan Qin,

    Corresponding author
    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
    • Phone: 86 22 60204297, Fax: 86 22 60204297
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  • Lei Chen,

    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
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  • Yuhuan Chen,

    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
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  • Jinsuo Liu,

    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
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  • Guifang Li,

    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
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  • Wei Quan,

    1. Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
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  • Jidong Zhang,

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130023, Jilin Province, P. R. China
    • Phone: 86 431 85262897, Fax: 86 431 85262951
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  • Donghang Yan

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130023, Jilin Province, P. R. China
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Abstract

Inverted bottom-emission organic light emitting diodes (IBOLEDs) employing the electron injection structure of indium tin oxide (ITO)/1,4,5,8-naphthalene-tetracarboxylic-dianhydride (NTCDA)/Li2CO3 doped bathocuproine (BCP) (1:4 Li2CO3:BCP) were fabricated, where NTCDA and BCP stand for NTCDA and BCP, respectively. The NTCDA on ITO was characterized crystalline and n-doped as a result of the interaction between ITO and NTCDA. Compared to the IBOLED using the electron injection structure of ITO/10 nm 1:4 Li2CO3:BCP, the one utilizing the electron injection structure of ITO/3 nm NTCDA/7 nm 1:4 Li2CO3:BCP showed the remarkable increases in both current density and efficiency, mainly due to the higher electron conductivity of n-doped NTCDA than that of n-doped BCP. The dependence of the current conduction in IBOLED on the thickness of NTCDA was investigated. We provide a simple method to significantly enhance the performance of IBOLEDs.

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