Fig. 4. (A–C) Time-dependent absorption changes and (D–F) corresponding difference absorption changes for 15 minutes recorded for 2D mixed halide perovskites with (A and D) BzA, (B and E) BDA, and (C and F) PDMA, respectively, upon CW 405 nm laser irradiation (100 mW cm−2) for 15 minutes. In the difference absorption spectra, the 0 min spectrum serves as a reference spectrum for subtraction.
