Advanced Materials

Organic Electronics: Bifunctional Star-Burst Amorphous Molecular Materials for OLEDs: Achieving Highly Efficient Solid-State Luminescence and Carrier Transport Induced by Spontaneous Molecular Orientation (Adv. Mater. 19/2013)

Authors

  • Jun Yun Kim,

    1. Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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  • Takuma Yasuda,

    Corresponding author
    1. Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
    2. International Institute for Carbon Neutral Energy, Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
    3. PRESTO, Japan Science and Technology Agency (JST), Chiyoda-ku, Tokyo 102-0076, Japan
    • Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
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  • Yu Seok Yang,

    1. Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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  • Chihaya Adachi

    Corresponding author
    1. Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
    2. International Institute for Carbon Neutral Energy, Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
    • Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
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Abstract

A design strategy for achieving both efficient solid-state luminescence and high carrier transport properties in organic amorphous molecular materials is demonstrated by Chihaya Adachi, Takuma Yasuda, and co-workers on page 2666. The designed star-burst molecules form amorphous solid films, in which they can align horizontally onto the substrate. This preferential horizontal molecular orientation leads to enhanced charge carrier transport and improved light emission. A high external electroluminescence quantum efficiency of up to 5.9% is achieved by incorporating these bifunctional materials in OLEDs.

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