White Stacked Electrophosphorescent Organic Light-Emitting Devices Employing MoO3 as a Charge-Generation Layer

Authors

  • H. Kanno,

    1. Department of Electrical Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
    2. Currently on leave from Sanyo Electric Co. Ltd., Osaka 573-8534, Japan
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  • R. J. Holmes,

    1. Department of Electrical Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • Y. Sun,

    1. Department of Electrical Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • S. Kena-Cohen,

    1. Department of Electrical Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • S. R. Forrest

    1. Department of Electrical Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • The authors thank Universal Display Corporation for their technical support, and particularly Dr. B. W. D'Andrade for helpful discussion. This work was partially supported by the Department of Energy Solid State Lighting Program via a subcontract from the University of Southern California, and Universal Display Corporation.

Abstract

original image

White stacked electrophosphorescent organic light-emitting devices employing three metallorganic phosphors in a compound emission layer (see Figure) are demonstrated. They show an external efficiency of 51 % and power efficiency of 20.7 lm W–1 at practical illumination intensities. A transparent MoO3 film between two adjacent electrophosphorescent elements efficiently injects charge into the stacked elements.

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