Fig. 3: Temperature-dependent interlayer coupling in the MQW superlattices.
From: Scalable photonic sources using two-dimensional lead halide perovskite superlattices
a Room temperature (RT) PL and absorption (Abs) spectra (solid curves) showing three optical transitions, A, B, and C, in comparison with PL spectrum at 77 K (dashed curve), featuring the I exciton peak. b Evolution of PL spectra for the superlattice (left, dQB = 25.6 Å) and diluted solution (right) with temperature T. The I exciton peak emerge in the superlattice sample when T is below 120 K, suggesting interlayer coupling. c Time-resolved PL profiles in the superlattice revealing the power-law characteristics for the A excitons and the ultralong delayed dynamics for the I excitons at low temperature.
