Cesium lead halide perovskites have shown great potential applications in photoelectric devices because of their high quantum efficiency, good stability, and tunable bandgap. Herein, we prepared CsPbBr₃ microwires with a high crystal quality, smooth surface, and rectangular cross section via the solution method. The as-prepared microwires presented a high quality whispering gallery mode lasing with a low threshold of 9.1 μJ cm⁻² and a high quality factor of ∼3000. Furthermore, we obtained the alloys of CsPbCl_xBr_3−x (0 < x < 2) microwires through the gas-phase anion exchange method and realized the wavelength tunable single-mode lasing emission ranging from ∼546.8 nm to ∼468.0 nm. This work will expand the practical application of lead halide perovskites in spectrograph, optical communication, and in-chip photoelectric devices.

中文翻译：

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卤化铯铯钙钛矿微丝的波长可调单模激光

卤化铯铅钙钛矿因其高量子效率，良好的稳定性和可调节的带隙而在光电器件中显示出巨大的潜在应用。在这里，我们通过溶液法制备了具有高晶体质量，光滑表面和矩形横截面的CsPbBr ₃微丝。所制备的微丝呈现高质量回音壁模式与9.1低阈值激射μ Ĵ厘米^-2和~3000高品质因数。此外，我们获得了CsPbCl _x Br _3-x的合金（0 <x <2）微线通过气相阴离子交换法实现了波长可调的单模激光发射，波长范围从〜546.8 nm至〜468.0 nm。这项工作将扩大卤化钙钛矿在光谱仪，光通信和芯片内光电器件中的实际应用。