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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Reversible, Full-Color Luminescence by Post-treatment of Perovskite Nanocrystals

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Title
Reversible, Full-Color Luminescence by Post-treatment of Perovskite Nanocrystals
Author
Yoon, Yung JinLee, Kang TaekLee, Tae KyungKim, Su HwanShin, Yun SeopWalker, BrightPark, Song YiHeo, JungwooLee, JunghoonKwak, Sang KyuKim, Gi-HwanKim, Jin Young
Keywords
perovskite nanocrystals; anion exchange; light-emitting diodes; post-treatment; saturated RGB; full-color emission; halogen solvent
Issue Date
201810
Publisher
CELL PRESS
Citation
JOULE, v., no., pp. -
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.
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DOI
http://dx.doi.org/10.1016/j.joule.2018.07.012
ISSN
2542-4351
Appears in Collections:
ECHE_Journal Papers
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