Fig. 3: Temperature-dependent behavior of excitonic species in the thin film. | Nature Communications

Fig. 3: Temperature-dependent behavior of excitonic species in the thin film.

From: Uncovering temperature-dependent exciton-polariton relaxation mechanisms in hybrid organic-inorganic perovskites

Fig. 3

a 2D perovskite thin film photoluminescence (PL) spectra as a function of temperature revealing, beyond the primary PL peak, the emergence of secondary and tertiary PL peaks assigned to b the bright exciton (X), the dark exciton (DX), and the biexciton (XX) with PL shown in red and absorption in blue. c, d Time-resolved PL for the unfiltered bare 2D film spectrum (black), X filtered spectrum (blue), and DX filtered spectrum (red). Insets: 2D perovskite thin film PL at c 60 K and d 80 K with fitted Gaussian constituent peaks. High (dark blue) and low (dark red) energy regions highlighted, showing the experimentally measured PL spectra with tunable edge-pass filters for X and DX decay measurements, respectively. e, f Lifetimes of the X emission (blue) and DX emission (red) simulated with Eqs. 3–5.

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