Light Propagation and Radiative Exciton Transport in Two-Dimensional Layered Perovskite Microwires

Layered quasi-two-dimensional perovskites are promising candidates for optoelectronic applications exhibiting excitons with high emission quantum yields, high stability, and ease of bandgap tunability. Here, we demonstrate a long-range (similar to 100 mu m) exciton transfer in a layered perovskite structure (en)(4)Pb2Br9.3Br, with the ethylene diammonium (en) as a spacer that takes place via the reabsorption of emitted photons. Using the two-objectives setup, we directly map the spatiotemporal dynamics of photoluminescence (PL) from perovskite microwires that reveal a clear spectroscopic signature of photon recycling: the appearance of PL emission rise times and the corresponding elongation of the PL decay as a function of separation distance between the excitation and emission locations. We further show that a kinetic model based on the photon-mediated mechanism of the lateral exciton propagation indeed successfully describes all the salient features of the experimental data and gives an independent assessment of the radiative efficiency of the exciton recombination. Our demonstration points out the possibility of judiciously exploiting light management strategies for future high-performance optoelectronic devices with layered perovskite structures.

Automated summary

This study demonstrates the long-range exciton transfer in layered perovskite structures and provides a detailed investigation of exciton propagation through spatiotemporal dynamics of photoluminescence. The characteristic of photon recycling includes the appearance of PL emission rise times and elongation of PL decay with separation distance between excitation and emission locations.