Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Layered metal halide perovskites are emerging as promising optical gain media for coherent light sources.1 Tin-based materials have shown good performances for amplified spontaneous emission and lasing in both single crystals and thin film configurations up to room temperature.2 Nevertheless, their optical properties and ability of achieving population inversion and lasing is critically affected by their composition, and their structure-property relationships are yet to be fully uncovered. Here we investigate the effect of two cations, namely butylammonium and diammoniobutane as templating molecules for BA2SnI4 and DABSnI4, belonging to a Ruddlesden-Popper and Dion-Jacobson structure, respectively. By means of solid-state ssNMR spectroscopy, we compare their structural rigidity through spin relaxation dynamics measurements and show that the more rigid crystal packing endowed by the DJ structure allows the achievement of low-threshold amplified spontaneous emission. Our work provides a new perspective for the design of this type of soft semiconductors for photonic applications.
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