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- W4307391932 endingPage "9794" @default.
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- W4307391932 abstract "Solution-processed perovskite materials have been enticing candidates for optical gain and lasing media because of their low cost, remarkable color purity, facile bandgap tunability, and high absorption cross-section. However, it is difficult, if not impossible, for them to highly amplify light with stable operations because they experience severe non-radiative emission losses due to their high density of surface and bulk defect centers and irregular composition. Here, we report that incorporating 5% of methylenediammonium dichloride (MDACl2) into mixed perovskite systems leads to a drastic reduction in the density of iodide interstitials and surface recombination losses. Subsequently, we record that MDA-treated, cavity-free thin perovskite films exhibit very photostable and ultra-low threshold amplified spontaneous emission of <6 μJ/cm2, approximately 30 times lower than the untreated films. Moreover, an ultra-high optical gain of 1000 cm–1 is successfully achieved, representing the highest reported gain for cavity-free perovskite films. These results are fully supported by extensive high-level density functional theory calculations and ultrafast transient absorption measurements. These findings will serve as a benchmark for the design and fabrication of low-threshold, high amplification perovskite media for lasers and light emission applications." @default.
- W4307391932 created "2022-11-01" @default.
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- W4307391932 date "2022-10-25" @default.
- W4307391932 modified "2023-09-29" @default.
- W4307391932 title "Ultra-Efficient Optical Gain and Lasing in MDACl<sub>2</sub>-Doped Perovskite Thin Films" @default.
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- W4307391932 doi "https://doi.org/10.1021/acs.chemmater.2c02857" @default.
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