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PL spectra recorded at ca. 8 s intervals for (MA)Pb(Br0.6I0.4)3 showing the PL evolution with light soaking, ranging from ca. 0 s (dark red) to ca. 150 s (purple). Spectra displayed were obtained at (A) 0.2 GPa, (B) 0.6 GPa, (C) 0.7 GPa, and (D) 0.9 GPa. (E) Pressure dependence of peak 1’s saturation energy (energy to which the PL band asymptotes with light exposure) for (MA)Pb(Br0.6I0.4)3.
