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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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Order-of-Magnitude, Broadband-Enhanced Light Emission from Quantum Dots Assembled in Multiscale Phase-Separated Block Copolymers

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Title
Order-of-Magnitude, Broadband-Enhanced Light Emission from Quantum Dots Assembled in Multiscale Phase-Separated Block Copolymers
Author
Kim, Geon YeongKim, ShinhoChoi, JinyoungKim, MoohyunLim, HunheeNam, Tae WonChoi, WonseokCho, Euene N.Han, Hyeuk JinLee, ChulHeeKim, Jong ChanJeong, Hu YoungChoi, Sung-YoolJang, Min SeokJeon, Duk YoungJung, Yeon Sik
Issue Date
2019-10
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.19, no.10, pp.6827 - 6838
Abstract
Achieving high emission efficiency in solid-state quantum dots (QDs) is an essential requirement for high-performance QD optoelectronics. However, most QD films suffer from insufficient excitation and light extraction efficiencies, along with nonradiative energy transfer between closely adjacent QDs. Herein, we suggest a highly effective strategy to enhance the photoluminescence (PL) of QD composite films through an assembly of QDs and poly-(styrene-b-4-vinylpyridine)) (PS-b-P4VP) block copolymer (BCP). A BCP matrix casted under controlled humidity provides multiscale phase-separation features based on (1) submicrometer-scale spinodal decomposition between polymer-rich and water-rich phases and (2) sub-10 nm-scale microphase separation between polymer blocks. The BCP-QD composite containing bicontinuous random pores achieves significant enhancement of both light absorption and extraction efficiencies via effective random light scattering. Moreover, the microphase-separated morphology substantially reduces the Forster resonance energy transfer efficiency from 53% (pure QD film) to 22% (BCP-QD composite), collectively achieving an unprecedented 21-fold enhanced PL over a broad spectral range.
URI
https://scholarworks.unist.ac.kr/handle/201301/30346
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.9b01941
DOI
10.1021/acs.nanolett.9b01941
ISSN
1530-6984
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