Fig. 1. Emission line-broadening in nanomaterials: the case of perovskite compounds.

a A sketch of different emission line-broadening mechanisms (${\Gamma }_{\mathrm{PL}}$ is the linewidth, $k_{\mathrm{B}}T$ the thermal energy, and FSS the fine structure splitting). b Schematic of the CsPbBr₃ crystal structure with two HAADF-STEM images, representing the two studied QD batches with mean edge lengths of 7 and 14 nm, respectively. c Room-temperature emission spectra at the ensemble and single particle levels. Both PL spectra feature similar emission line-broadening. Solid lines are best fits of a Lorentzian function to the experimental data (colored open circles).