AUTHOR=Veronese Alessandro , Patrini Maddalena , Bajoni Daniele , Ciarrocchi Carlo , Quadrelli Paolo , Malavasi Lorenzo 

TITLE=Highly Tunable Emission by Halide Engineering in Lead-Free Perovskite-Derivative Nanocrystals: The Cs2SnX6 (X = Cl, Br, Br/I, I) System

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00035

DOI=10.3389/fchem.2020.00035

ISSN=2296-2646

ABSTRACT=<p>Nanocrystals of Cs<sub>2</sub>SnX<sub>6</sub> (X = Cl, Br, Br<sub>0.5</sub>I<sub>0.5</sub>, and I) have been prepared by a simple, optimized, hot-injection method, reporting for the first time the synthesis of Cs<sub>2</sub>SnCl<sub>6</sub>, Cs<sub>2</sub>SnBr<sub>6</sub>, and mixed Cs<sub>2</sub>Sn(I<sub>0.5</sub>Br<sub>0.5</sub>)<sub>6</sub> nanocrystalline samples. They all show a cubic crystal structure with a linear scaling of lattice parameter by changing the halide size. The prepared nanocrystals have spherical shape with average size from 3 to 6 nm depending on the nature of the halide and span an emission range from 444 nm (Cs<sub>2</sub>SnCl<sub>6</sub>) to 790 nm (Cs<sub>2</sub>SnI<sub>6</sub>) with a further modulation provided by mixed Br/I systems.</p>