Exciton-phonon coupling in two-dimensional layered (BA)PbI perovskite microplates.

Two-dimensional layered (BA)PbI (BA = CHNH) perovskites are emerging as a new class of layered materials and show great potential in optoelectronic applications. Elucidating how exciton-phonon interaction affects the excitonic emission is of great importance for a better knowledge of their optoelectronic properties. In this letter, we synthesized high-quality (BA)PbI microplates solution methods, and dual-excitonic emission peaks (surface-emission and interior-emission) were detected from the as-grown samples at low temperatures.