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CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol–gel route starting from Cs4PbX6 nanocrystals

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Abstract

We developed a facile synthesis of nanocomposite powders of CsPbX3 nanocrystals (NCs) embedded in silica. The synthesis starts from colloidal Cs4PbX6 NCs that are mixed with tetraethyl orthosilicate in the presence of nitric acid, which triggers the sol–gel reaction yielding the formation of SiOx and the conversion of starting NCs into CsPbX3 ones. The overall reaction delivers CsPbX3 NCs encased in a silica matrix. The resulting CsPbX3/SiOx nano-composite powders exhibited enhanced moisture and thermal stability in air. Also, when mixing different CsPbX3/SiOx samples having diverse anion compositions, no interparticle anion exchange processes were observed, which is a further indication that the silica matrix acts as a robust barrier surrounding the NCs. Finallly, we used these composites as down-converter phosphors on top of a blue light-emitting diode (LED), delivering nearly ideal white light emission with the Commission Internationale de l'Eclairage (CIE) color coordinates (0.32, 0.33).

Graphical abstract: CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol–gel route starting from Cs4PbX6 nanocrystals

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Publication details

The article was received on 09 Sep 2019, accepted on 27 Sep 2019 and first published on 28 Sep 2019


Article type: Paper
DOI: 10.1039/C9NR07766A
Nanoscale, 2019, Advance Article

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    CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol–gel route starting from Cs4PbX6 nanocrystals

    S. Park, M. N. An, G. Almeida, F. Palazon, D. Spirito, R. Krahne, Z. Dang, L. De Trizio and L. Manna, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07766A

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