Fig. 1. (a) Low- and (b) high-resolution TEM images of CsPbBr₃ nanocrystals, corresponding scale bars are 20 and 5 nm; (c) fast Fourier transform and (d) XRD patterns.

Fig. 2. (a) Photos of CsPbBr₃ solution under ambient room light and UV illumination; (b) schematic illustration, (c) energy-dispersive spectroscopy spectra and (d) Raman spectrum of CsPbBr₃ nanocrystals.

Fig. 3. (a) Excitation spectrum, (b) optical absorption and photoluminescence spectrum, (c) photoluminescence decay spectrum and (d) transient absorption spectrum of CsPbBr₃ nanocrystals.

Fig. 4. A model of the effect of (a) inertia ligand or (b) strongly electronegative ligand AMPS on the optical properties of CsPbBr₃ nanocrystals.