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    Perovskite energy funnels for efficient light-emitting diodes

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    Type
    Article
    Authors
    Yuan, Mingjian
    Li Na Quan
    Comin, Riccardo
    Walters, Grant
    Sabatini, Randy
    Voznyy, Oleksandr cc
    Voznyy, Oleksandr cc
    Zhao, Yongbiao
    Beauregard, Eric M.
    Kanjanaboos, Pongsakorn cc
    Lu, Zhenghong
    Kim, Dong Ha cc
    Sargent, Edward H.
    KAUST Grant Number
    KUS-11-009-21
    Date
    2016-06-27
    Permanent link to this record
    http://hdl.handle.net/10754/678423
    
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    Abstract
    Organometal halide perovskites exhibit large bulk crystal domain sizes, rare traps, excellent mobilities and carriers that are free at room temperature - properties that support their excellent performance in charge-separating devices. In devices that rely on the forward injection of electrons and holes, such as light-emitting diodes (LEDs), excellent mobilities contribute to the efficient capture of non-equilibrium charge carriers by rare non-radiative centres. Moreover, the lack of bound excitons weakens the competition of desired radiative (over undesired non-radiative) recombination. Here we report a perovskite mixed material comprising a series of differently quantum-size-tuned grains that funnels photoexcitations to the lowest-bandgap light-emitter in the mixture. The materials function as charge carrier concentrators, ensuring that radiative recombination successfully outcompetes trapping and hence non-radiative recombination. We use the new material to build devices that exhibit an external quantum efficiency (EQE) of 8.8% and a radiance of 80W sr-1m-2. These represent the brightest and most efficient solution-processed near-infrared LEDs to date.
    Citation
    Yuan, M., Quan, L. N., Comin, R., Walters, G., Sabatini, R., Voznyy, O., … Sargent, E. H. (2016). Perovskite energy funnels for efficient light-emitting diodes. Nature Nanotechnology, 11(10), 872–877. doi:10.1038/nnano.2016.110
    Sponsors
    This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. L. N. Quan and D. H. Kim acknowledge the financial support by National Research Foundation of Korea Grant funded by the Korean Government (2014R1A2A1A09005656). The authors thank R. Wolowiec and D. Kopilovic for their help during the course of the study.
    Publisher
    NATURE PUBLISHING GROUP
    Journal
    NATURE NANOTECHNOLOGY
    DOI
    10.1038/NNANO.2016.110
    Additional Links
    http://www.nature.com/articles/nnano.2016.110
    ae974a485f413a2113503eed53cd6c53
    10.1038/NNANO.2016.110
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