Figure 25.
(a) Left: A schematic depiction of a crystal structure of a CsPbBr3 perovskite that comprises two interpenetrating cubic sublattices formed by PbBr6 octahedra and Cs ions. Right: a high-resolution transmission electron microscopy image of an individual cubically shaped CsPbBr3 nanocrystal with a cube side of ∼13 nm. Based on well-resolved lattice fringes, the lattice constant is 5.8 Å, which is the same as for the bulk crystal. (b) The PL spectra of a series of CsPbX3 nanocrystals with a varied composition of a halide component demonstrate wide-range spectral tunability which covers the entire range of visible wavelengths. All panels reproduced with permission from ref (44). Copyright 2015 American Chemical Society.