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Femtosecond transient absorption (TA) spectra of Cs2AgBiBr6 film with an excited energy of 350 nm. (a) Pseudocolor TA plot. (b) TA spectra at indicated delay time from 5 ps to 2859 ps. (c) Ground-state bleach (GSB) decay dynamic probed at 439 nm. The as-prepared Cs2AgBiBr6 films were annealed at 300 °C for 15 min.
