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곽상규

Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
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Reversible, Full-Color Luminescence by Post-treatment of Perovskite Nanocrystals

Author(s)
Yoon, Yung JinLee, Kang TaekLee, Tae KyungKim, Su HwanShin, Yun SeopWalker, BrightPark, Song YiHeo, JungwooLee, JunghoonKwak, Sang KyuKim, Gi-HwanKim, Jin Young
Issued Date
2018-10
DOI
10.1016/j.joule.2018.07.012
URI
https://scholarworks.unist.ac.kr/handle/201301/24678
Fulltext
https://www.sciencedirect.com/science/article/pii/S2542435118303234#fig4
Citation
JOULE, v.2, no.10, pp.2105 - 2116
Abstract
Organometallic perovskite devices have been intensively studied in recent years; however, a comprehensive understanding of their many unique material properties remains to be unveiled. In this work, we demonstrate for the first time a simple, reversible, and non-destructive post-treatment method of anion exchange between CsPbX3 perovskite nanocrystals (CsPbCl3 ⇌ CsPbBr3 ⇌ CsPbI3) with halogenated solvents, which is mediated by nucleophilic phosphine ligands. Anion exchange between CsPbX3 perovskite nanocrystals and haloalkane solvents (CHCl3, CHBr3, CH3CH2I) proceeded readily upon addition of nucleophilic trialkyl phosphines and could be controlled via nucleophile concentration and reaction time, allowing precise tuning of the anion composition and band gap. With our simple method, we obtained luminescence covering the entire visible spectrum from 400 to 700 nm. Furthermore, saturated and vivid RGB LED devices were successfully fabricated using the anion-exchanged nanocrystals.
Publisher
CELL PRESS
ISSN
2542-4351
Keyword
LIGHT-EMITTING-DIODESANION-EXCHANGEHALIDE PEROVSKITESCSPBX3CONVERSIONDEVICESSURFACEBRCL

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