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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