Room-Temperature Nanosecond Amplified Spontaneous Emission from Tin Iodide Perovskite Nanostructures

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High Resolution Image Download MS PowerPoint Slide Lead halide perovskite nanocrystals (NCs) exhibit remarkable stimulated emission properties, facilitating efficient optically pumped lasing across the visible spectrum. While their tin-based counterparts do not match such achievements yet, they offer the prospect of a greener, lead-free alternative, also extending access to the important near-infrared region. In this study, we exploit recent advances in the synthesis of colloidal tin halide perovskite nanostructures to fabricate robust layer-by-layer heterostructures composed of CsSnI 3 nanocrystals (NCs) and the eco-friendly polymer cellulose acetate (CA). The engineered structures support nanosecond-pumped amplified spontaneous emission (ASE), exhibiting a threshold as low as 870 μJ/cm 2 and a net modal gain of up to 25 cm –1 . The alternating NC–polymer film architecture not only enhances optical waveguiding within the high-refractive-index CsSnI 3 layers, but also enables uniform active layer formation through sequential thin-film deposition, in contrast to disordered thick NC films that sustain ASE only at cryogenic temperatures. This approach presents a promising pathway toward the realization of practical, lead-free perovskite-based laser technologies.

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