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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM

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Growth of Nanosized Single Crystals for Efficient Perovskite Light-Emitting Diodes

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Title
Growth of Nanosized Single Crystals for Efficient Perovskite Light-Emitting Diodes
Author
Lee, SeungjinPark, Jong HyunNam, Yun SeokLee, Bo RamZhao, BaodanDi Nuzzo, DanieleJung, Eui DaeJeon, HanseolKim, Ju-YoungJeong, Hu YoungFriend, RichardSong, Myoung Hoon
Issue Date
2018-04
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.12, no.4, pp.3417 - 3423
Abstract
Organic inorganic hybrid perovskites are emerging as promising emitting materials due to their narrow full-width at half maximum emissions, color tunability, and high photoluminescence quantum yields (PLQYs). However, the thermal generation of free charges at room temperature results in a low radiative recombination rate and an excitation-intensity-dependent PLQY, which is associated with the trap density. Here, we report perovskite films composed of uniform nanosized single crystals (average diameter = 31.7 nm) produced by introducing bulky amine ligands and performing the growth at a lower temperature. By effectively controlling the crystal growth, we maximized the radiative bimolecular recombination yield by reducing the trap density and spatially confining the charges. Finally, highly bright and efficient green emissive perovskite light emitting diodes that do not suffer from electroluminescence blinking were achieved with a luminance of up to 55 400 cd m(-2), current efficiency of 55.2 cd A(-1), and external quantum efficiency of 12.1%.
URI
https://scholarworks.unist.ac.kr/handle/201301/23968
URL
https://pubs.acs.org/doi/abs/10.1021/acsnano.7b09148
DOI
10.1021/acsnano.7b09148
ISSN
1936-0851
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