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Thinnest-Known, Foldable LED for Integrated Electronic Devices

University of Washington scientists have built the thinnest-known LED that can be used as a source of light energy in electronics. The LED is made from flat sheets of tungsten diselenide, a member of a group of two-dimensional materials that have been recently identified as the thinnest-known semiconductors. The scientists use regular adhesive tape to extract a single sheet of this material from thick, layered pieces. In this video, a University of Washington researcher demonstrates the technique to isolate a single layer of graphene. This simple technique, commonly used by scientists worldwide, can isolate monolayers of many materials including tungsten diselenide. "We are able to make the thinnest-possible LEDs, only three atoms thick yet mechanically strong. Such thin and foldable LEDs are critical for future portable and integrated electronic devices," says assistant professor Xiaodong Xu.

Topics:
Electronic Components Electronics & Computers Energy Energy Efficiency LEDs Lighting Materials Semiconductors & ICs

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    Transcript

    00:00:01 so first we get a piece of Scotch tape making sure it is free of any dust or glue marks or anything bad like that and then we just fold the edges over to make little handles like so then we take the flakes of graphite and we want to put about two or three on the edge of the tape and then we just bring the tape

    00:00:45 together until it is even evenly spread across the tape and then we take our piece of silicon oxide lay the tape right on top and use an eraser to go over the tape to adhere it to the oxide

    00:01:40 then we peel off the tape at a low contact angle what up