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• W3199869765 abstract "CsPbBr3 is an all-inorganic halide perovskite with excellent photoluminescence (PL) properties for laser applications. Amplified spontaneous emission (ASE) is a prerequisite for lasing and typically observed from low-dimensional CsPbBr3 nanostructures, where quantum confinement enhances ASE. However, a gain medium for lasing should be prepared into a robust bulk form that works under intense light illumination. Here, we demonstrate that bulk CsPbBr3 single crystals exhibit highly efficient ASE with a threshold of 46 MWcm–2 at 520 nm, if PL reabsorption via the indirect Rashba gap is properly suppressed by thickness control. Based on a series of spectroscopic and microscopic measurements, we show that this below-the-gap absorption can significantly alter the PL feature and even the apparent color of the crystal depending on the crystal size. Our results show that a thin CsPbBr3 single crystal can be utilized for lasing applications when engineered into a submillimeter thickness for effective light–matter interaction." @default.
• W3199869765 created "2021-09-27" @default.
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• W3199869765 date "2021-09-17" @default.
• W3199869765 modified "2023-10-14" @default.
• W3199869765 title "On the Origin of Room-Temperature Amplified Spontaneous Emission in CsPbBr₃ Single Crystals" @default.
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• W3199869765 doi "https://doi.org/10.1021/acs.chemmater.1c00591" @default.
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