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Issue 27, 2019
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Low-dimensional iodide perovskite nanocrystals enable efficient red emission

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Abstract

We report herein a simple ligand-assisted reprecipitation method at room temperature to synthesize mixed-cation hybrid organic–inorganic perovskite nanocrystals with low structural dimensionality. The emission wavelength of iodide-based perovskites is thus tuned from the near-infrared to the red part of the visible spectrum. While this is mostly achieved in the literature by addition of bromide, we demonstrate here a controllable blueshift of the band gap by varying the chain length of the alkylammonium ligands. Furthermore, an antisolvent washing step was found to be crucial to purify the samples and obtain single-peak photoluminescence with a narrow linewidth. The so-formed nanocrystals exhibit high and stable photoluminescence quantum yields exceeding 90% over 500 hours, making these materials ideal for light-emitting applications.

Graphical abstract: Low-dimensional iodide perovskite nanocrystals enable efficient red emission

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Supplementary files

Article information


Submitted
27 May 2019
Accepted
14 Jun 2019
First published
14 Jun 2019

Nanoscale, 2019,11, 12793-12797
Article type
Communication

Low-dimensional iodide perovskite nanocrystals enable efficient red emission

L. Martínez-Sarti, S. H. Jo, Y. Kim, M. Sessolo, F. Palazon, T. Lee and H. J. Bolink, Nanoscale, 2019, 11, 12793
DOI: 10.1039/C9NR04520A

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