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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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High-Performance Perovskite Light-emitting Diodes via Morphological Control of Perovskite Film

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Title
High-Performance Perovskite Light-emitting Diodes via Morphological Control of Perovskite Film
Author
Yu, Jae ChoulKim, Da BinJung, Eui DaeLee, Bo RamSong, Myoung Hoon
Keywords
Efficiency; Electroluminescence; Light; Light emitting diodes; Morphology; Organic solvents Crystallization rates; Inorganic components; Luminous efficiency; Maximum luminance; Morphological control; Perovskite films; Photoluminescence quantum efficiency; Solution processable
Issue Date
201604
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.8, no.13, pp.7036 - 7042
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).
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DOI
http://dx.doi.org/10.1039/C5NR05604G
ISSN
2040-3364
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