Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.302
Publication date: 16th December 2024
Low-dimensional metal halide perovskites are attracting great interest for photovoltaics and photonics. In particular, 2D tin perovskites have been shown to have good optical gain properties which make them promising for applications as coherent light sources. [1] On the other hand, the ability of lead-based 2D perovskites to sustain lasing remain highly controversial. [2] Here we show that both Sn and Pb-based 2D perovskites thin films can achieve amplified stimulated emission, and compare their properties as function of the optical pumping conditions as well as of the materials’ structural characteristics. By employing 1H, 13C, 15N, 119Sn and 207Pb solid state NMR spectroscopy, we were able to discern the local structural environments of the 2D perovskite of interest through their characteristic spectral fingerprints. Spin relaxation dynamics measurements reveal that the local supramolecular spatial arrangements, the molecular motions and structural rigidity are key factors shaping the energetic landscape of the material and its luminescence properties. Our work provides a deeper understanding of the structure-properties relationship of these soft semiconductors to assist the rational engineering of materials with improved optical properties for lasing applications.
European Unions Horizon Europe Research Council programme under Grant Agreement No. 101040681 (ERC Starting Grant SUPER).
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