DOI: https://doi.org/10.29363/nanoge.emlem.2022.038
Publication date: 15th July 2022
The potential applicability of random lasers is largely limited because of chaotic fluctuations of spectral positions of lasing modes. In the present work we disclosed that spectrally stable narrow random lasing (RL) lines with quality factor Q as high as Q ≈ 10^4 at 20 K and the Amplified Spontaneous Emission (ASE) threshold as low as 2 microJ/cm2 are generated in thin polycrystalline films of formamidinium tin triiodide (FASnI3) perovskite chemically stabilized against Sn2+ to Sn4+ oxidation. The spectral positions of the RL lines are stable not only under unchanged excitation fluence, but also when the fluence alters by more than one order of magnitude. We found that different mechanisms are responsible for the formation of broad ASE contour and narrow RL lines and that ASE can be essentially suppressed by means of a decrease of the excitation spot linear size from ≈ 400 to ≈ 100 micrometers. Statistical analysis of RL line spacing suggests that a set of strongly localized modes is responsible for the observed set of narrow RL lines. We suggest also that high refractive index as well as high density of grain package are the main factors which determine the RL spectral stability and high Q and differ FASnI3 perovskite polycrystalline films from their widely studied Pb-based perovskite counterparts where chaotic RL is observed.
This work has received funding from the European Union´s Horizon 2020 research and innovation program under grant agreement No 862656 (project DROP-IT).
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