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    Tailoring the Energy Landscape in Quasi-2D Halide Perovskites Enables Efficient Green-Light Emission

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    Type
    Article
    Authors
    Quan, Li Na cc
    Zhao, Yongbiao
    García de Arquer, F. Pelayo
    Sabatini, Randy
    Walters, Grant
    Voznyy, Oleksandr cc
    Comin, Riccardo
    Li, Yiying
    Fan, James Z.
    Tan, Hairen cc
    Pan, Jun cc
    Yuan, Mingjian
    Bakr, Osman cc
    Lu, Zhenghong cc
    Kim, Dong Ha cc
    Sargent, Edward H. cc
    KAUST Department
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    KUS-11-009-21
    Date
    2017-05-10
    2017-05-05
    Online Publication Date
    2017-05-10
    Print Publication Date
    2017-06-14
    Permanent link to this record
    http://hdl.handle.net/10754/623655
    
    Metadata
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    Abstract
    Organo-metal halide perovskites are a promising platform for optoelectronic applications in view of their excellent charge-transport and bandgap tunability. However, their low photoluminescence quantum efficiencies, especially in low-excitation regimes, limit their efficiency for light emission. Consequently, perovskite light-emitting devices are operated under high injection, a regime under which the materials have so far been unstable. Here we show that, by concentrating photoexcited states into a small subpopulation of radiative domains, one can achieve a high quantum yield, even at low excitation intensities. We tailor the composition of quasi-2D perovskites to direct the energy transfer into the lowest-bandgap minority phase and to do so faster than it is lost to nonradiative centers. The new material exhibits 60% photoluminescence quantum yield at excitation intensities as low as 1.8 mW/cm2, yielding a ratio of quantum yield to excitation intensity of 0.3 cm2/mW; this represents a decrease of 2 orders of magnitude in the excitation power required to reach high efficiency compared with the best prior reports. Using this strategy, we report light-emitting diodes with external quantum efficiencies of 7.4% and a high luminescence of 8400 cd/m2.
    Citation
    Quan LN, Zhao Y, García de Arquer FP, Sabatini R, Walters G, et al. (2017) Tailoring the Energy Landscape in Quasi-2D Halide Perovskites Enables Efficient Green-Light Emission. Nano Letters. Available: http://dx.doi.org/10.1021/acs.nanolett.7b00976.
    Sponsors
    This publication is based in part on work supported by award no. 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.Q. and D.H.K. acknowledge the financial support by National Research Foundation of Korea Grant funded by the Korean Government (2014R1A2A1A09005656 and 2015M1A2A2058365). F.P.G.d.A. acknowledges financial support from the Connaught fund.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.7b00976
    PubMed ID
    28475344
    Additional Links
    http://pubs.acs.org/doi/full/10.1021/acs.nanolett.7b00976
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.7b00976
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

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