Fig. 5: Temperature dependent optical characteristics of CsxFA1-xPbI3 PQDs.
From: Thermal tolerance of perovskite quantum dots dependent on A-site cation and surface ligand
a In situ PL spectra for FAPbI3, Cs0.25FA0.75PbI3, Cs0.5FA0.5PbI3, Cs0.75FA0.25PbI3, and CsPbI3 PQDs. b FWHM extracted from in situ PL spectra. The data are normalized to the maximum intensity. The black squares are the experimental data fitted using Segall’s expression (red solid line). The PL exciton linewidth broadening arises from inhomogeneous broadening term Γ(T) = Γ0 (orange dash-dot line), acoustic phonon interaction Γ(T) = Γ0 + ΓAC (blue dash-dot line), and longitudinal optical phonon interaction Γ(T) = Γ0 + ΓLO (green dash-dot line). c, d The temperature dependence of normalized PL intensities and bandgaps for different CsxFA1-xPbI3 PQDs. The PL intensity is normalized by its value at 80K. The bandgap values are extracted using the Gauss fit. Source data are provided as a Source Data file.
