fig3

Figure 3. Temperature-dependent photoluminescence spectra for MAPbI₃ and FAPbI₃. (A) Color plots of normalized PL spectra for MAPbI₃-based perovskites at different temperatures from 110 to 300 K; (B) The corresponding excitonic peak positions of MAPbI₃-based perovskites; (C) Color plots of normalized PL spectra for FAPbI₃-based perovskites at varying temperatures from 50 to 290 K; (D) The corresponding excitonic peak position of the FAPbI₃-based perovskites. PL: Photoluminescence.