Publication date: 17th July 2025
Lead halide perovskite nanocrystals (PeNCs) exhibit remarkable stimulated emission properties, facilitating efficient optically pumped lasing across the visible spectrum. While their tin-based nanocrystal counterparts don't match such achievements yet, they offer the prospect of a greener, lead-free alternative, also extending access to the important near-infrared region.
Herein, we exploit recent advancements in the synthesis [1], solid state processing and photophysics [2] of colloidal CsSnI₃ nanostructures to demonstrate amplified spontaneous emission (ASE) under nanosecond pulsed optical excitation at cryogenic temperatures up to 150 K. Further optimization is achieved by incorporating multilayered structures of CsSnI₃ NCs and cellulose acetate (CA), which not only improves the optical waveguiding within the higher-index CsSnI₃ NC layer but also enables the assembly of the active region through uniform thin alternating layers rather than a single thick, disordered NC slab. Using this approach, nanosecond, room-temperature ASE with a threshold of ~870 μJ/cm² and a net modal gain of ~25 cm⁻¹ is demonstrated [3]. The work not only challenges the perceived limitations of unstable lead-free perovskite NCs but also outlines a viable strategy for their integration into practical, nanosecond-pumped photonic devices
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