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Issue 13, 2016
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High-performance perovskite light-emitting diodes via morphological control of perovskite films

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Abstract

Solution-processable perovskite materials have garnered tremendous attention because of their excellent charge carrier mobility, possibility of a tunable optical bandgap, and high photoluminescence quantum efficiency (PLQE). In particular, the uniform morphology of a perovskite film is the most important factor in realizing perovskite light-emitting diodes (PeLEDs) with high efficiency and full-coverage electroluminescence (EL). In this study, we demonstrate highly efficient PeLEDs that contain a perovskite film with a uniform morphology by introducing HBr into the perovskite precursor. The introduction of HBr into the perovskite precursor results in a perovskite film with a uniform, continuous morphology because the HBr increases the solubility of the inorganic component in the perovskite precursor and reduces the crystallization rate of the perovskite film upon spin-coating. Moreover, PeLEDs fabricated using perovskite films with a uniform, continuous morphology, which were deposited using 6 vol% HBr in a dimethylformamide (DMF)/hydrobromic acid (HBr) cosolvent, exhibited full coverage of the green EL emission. Finally, the optimized PeLEDs fabricated with perovskite films deposited using the DMF/HBr cosolvent exhibited a maximum luminance of 3490 cd m−2 (at 4.3 V) and a luminous efficiency of 0.43 cd A−1 (at 4.3 V).

Graphical abstract: High-performance perovskite light-emitting diodes via morphological control of perovskite films

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Publication details

The article was received on 18 Aug 2015, accepted on 10 Nov 2015 and first published on 13 Nov 2015


Article type: Paper
DOI: 10.1039/C5NR05604G
Citation: Nanoscale, 2016,8, 7036-7042
  • Open access: Creative Commons BY-NC license
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    High-performance perovskite light-emitting diodes via morphological control of perovskite films

    J. C. Yu, D. B. Kim, E. D. Jung, B. R. Lee and M. H. Song, Nanoscale, 2016, 8, 7036
    DOI: 10.1039/C5NR05604G

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