High-performance perovskite light-emitting diodes via morphological control of perovskite films.

Citation data:

Nanoscale, ISSN: 2040-3372, Vol: 8, Issue: 13, Page: 7036-42

Publication Year:
2016
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/18382
PMID:
26607474
DOI:
10.1039/c5nr05604g
Author(s):
Yu, Jae Choul, Kim, Da Bin, Jung, Eui Dae, Lee, Bo Ram, Song, Myoung Hoon
Publisher(s):
Royal Society of Chemistry (RSC), The Royal Society of Chemistry, ROYAL SOC CHEMISTRY
Tags:
Materials Science, 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
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article description
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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