Advanced Materials

High-Efficiency Solution-Processed Small Molecule Electrophosphorescent Organic Light-Emitting Diodes

Authors

  • Min Cai,

    1. Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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  • Teng Xiao,

    1. Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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  • Emily Hellerich,

    1. Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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  • Ying Chen,

    1. Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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  • Ruth Shinar,

    Corresponding author
    1. Microelectronics Research Center, and Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA
    • Microelectronics Research Center, and Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA.
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  • Joseph Shinar

    Corresponding author
    1. Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
    • Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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Abstract

Spin-coated small-molecule organic light-emitting diodes (OLEDs) based on green-emitting Ir(mppy)3-doped 4,4'-bis(9-carbazolyl)-biphenyl (CBP) blended with electron- and hole-transporting molecules are demonstrated to have very high efficiencies (up to 60 lm/W and 69 Cd/A without any outcoupling enhancement, which can double with a high-quality microlens array). An additional electron-transporting/hole-blocking BPhen layer is thermally evaporated on the active layer, followed by the LiF/Al cathode.

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