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  • Band Alignment with Self-Assembled 2D Layer of Carbon Derived from Waste to Balance Charge Injection in Perovskite Crystals Based Rigid and Flexible Light Emitting Diodes

    Author(s)
    Singh, Amandeep
    Minh, Tam Hoang
    Ngoc, Duy Pham
    Wang, Tony
    Mcdonald, Joshua
    Li, Qin
    Ostrikov, Kostya Ken
    Wang, Hongxia
    Sonar, Prashant
    Griffith University Author(s)
    Sonar, Prashant
    Ostrikov, Ken
    Li, Qin
    Year published
    2021
    Metadata
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    Abstract
    The halide perovskite nanocrystals (P-NCs) can address a plethora of issues of the light-emission technologies, due to its low temperature processing. To successfully employ P-NCs for light-emitting diodes (LEDs), one needs to resolve the issues of stability of the LEDs. The stability of device can be achieved by charge balance of electrons and holes recombination in active material. To investigate this herein, a self-assembled carbon dots (CDs) layer is fabricated from waste small strands of human hair. The self-assembled CDs layer is used beneath P-NCs layer to reduce the band-off set for hole transport, thus balancing the ...
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    The halide perovskite nanocrystals (P-NCs) can address a plethora of issues of the light-emission technologies, due to its low temperature processing. To successfully employ P-NCs for light-emitting diodes (LEDs), one needs to resolve the issues of stability of the LEDs. The stability of device can be achieved by charge balance of electrons and holes recombination in active material. To investigate this herein, a self-assembled carbon dots (CDs) layer is fabricated from waste small strands of human hair. The self-assembled CDs layer is used beneath P-NCs layer to reduce the band-off set for hole transport, thus balancing the electron and holes carrier in active layer. The layer is used as an active light-emitting layer to fabricate a LED device that exhibits green luminescence of 4800 cd m−2 at a current efficiency of 10.7 cd A−1 and external quantum efficiency of 4.8%. The LED exhibits operational stability of nearly 200 h. The same film is used to demonstrate a flexible device with maximum luminescence of 2259 cd m−2, with a high current density of 474 mA cm−2, current efficiency of 1.37 cd A−1 and a low turn-on voltage of 3.5 V. All the display devices are measured in air without encapsulation.
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    Journal Title
    Advanced Materials Technologies
    DOI
    https://doi.org/10.1002/admt.202100583
    Note
    This publication has been entered as an advanced online version in Griffith Research Online.
    Subject
    Nanotechnology
    Electrical engineering
    Science & Technology
    Materials Science, Multidisciplinary
    Materials Science
    carbon dots
    Publication URI
    http://hdl.handle.net/10072/409768
    Collection
    • Journal articles

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