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Low-dimensional iodide perovskite nanocrystals enable efficient red emission

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	Martínez Sarti, Laura; Jo, Seung Hyeon; Kim, Young-Hoon; Sessolo, Michele Perfil; Palazón Huet, Francisco; Lee, Tae-Woo; Bolink, Henk Perfil
	This document is a artículoDate2019
	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.
	Martínez Sarti, Laura Jo, Seung Hyeon Kim, Young-Hoon Sessolo, Michele Palazón Huet, Francisco Lee, Tae-Woo Bolink, Henk 2019 Low-dimensional iodide perovskite nanocrystals enable efficient red emission Nanoscale 11 12793 12797
	https://doi.org/10.1039/C9NR04520A