Wavelength‐tunable nano/microlasers are essential components for various highly integrated and multifunctional photonic devices. Based on the different band gap/composition of inorganic cesium lead halide perovskite materials, broad band light absorption and emission devices can be achieved. Herein, a vapor–liquid–solid route for growing cesium lead halide perovskite (CsPbX₃, X = Cl, Br, I) microcrystal structures is demonstrated. These square‐shaped microstructures exhibit strong blue, green, and red photoluminescence, indicating that their band gaps can be engineered to cover the entire visible range. Optically pumped red–green–blue whispering‐gallery mode lasers based on the controlled composition of these microcrystals are successfully realized at room temperature. Moreover, rationally designed white‐light‐emitting chips with high brightness are fabricated utilizing these metal halide perovskite microstructures grown on sapphire. All these results evidently suggest a feasible route to the design of red–green–blue lasers and white‐light emitters for potential applications in full‐color displays as well as photonic devices.

中文翻译：

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卤化钙铅钛矿（CsPbX3，X = Cl，Br，I）的室温-红-绿-蓝耳语-画廊模式激光发射和白光发射

波长可调纳米/微激光器是各种高度集成和多功能光子设备的基本组件。基于无机铯卤化铅钙钛矿材料的不同带隙/组成，可以实现宽带光吸收和发射装置。在此，提出了一种生长卤化铯铯钙钛矿的气-液-固路线（CsPbX ₃，X ＝ Cl，Br，I）证明了微晶结构。这些方形微结构显示出强烈的蓝色，绿色和红色光致发光，表明可以将其带隙设计为覆盖整个可见范围。基于这些微晶的受控成分的光泵浦红-绿-蓝耳语-画廊模式激光在室温下成功实现。此外，利用在蓝宝石上生长的这些金属卤化物钙钛矿微结构，可以制造出合理设计的，具有高亮度的发白光芯片。所有这些结果显然表明，为在全色显示器以及光子设备中的潜在应用而设计红绿蓝激光和白光发射器的可行途径。