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The kinetics of light emission in halide perovskite light‐emitting diodes (LEDs) and solar cells is composed of a radiative recombination of voltage‐injected carriers mediated by additional steps such as carrier trapping, redistribution of injected carriers, and photon recycling that affect the observed luminescence decays. These processes are investigated in high‐performance halide perovskite LEDs,...
An unusual spectrally reproducible near‐IR random lasing (RL) with no fluctuation of lasing peak wavelength is disclosed in polycrystalline films of formamidinium tin triiodide perovskite, which have been chemically stabilized against Sn2+ to Sn4+ oxidation. Remarkably, a quality Q‐factor as high as ≈104 with an amplified spontaneous emission (ASE) threshold as low as 2 µJ cm−2 (both at 20 K) are...
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