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

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† Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada
‡ Department of Chemistry and Nano Science, Ewha Woman’s University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
§ Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada
∥ Division of Materials Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
*E-mail: [email protected]
*E-mail: [email protected]
*E-mail: [email protected]
Cite this: Nano Lett. 2017, 17, 6, 3701–3709
Publication Date (Web):May 5, 2017
https://doi.org/10.1021/acs.nanolett.7b00976
Copyright © 2017 American Chemical Society
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    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.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.nanolett.7b00976.

    • A description of Monte Carlo modeling of recombination kinetics. Figures showing a unit cell structure of perovskites; XRD, AFM, absorption, and PL analysis; UPS spectra; transient absorption data; transient PL analysis; LED characteristics; EL spectra; and LED stability. (PDF)

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