Miniaturized solid-state lasers have obtained great development for their outstanding properties. Among the optical gain materials discovered so far, CsPbBr₃ perovskite quantum dots (QDs) have been recognized as one of the most promising candidates due to the direct bandgap, narrow emission linewidth and high quantum yield. Herein, we report the fabrication of whispering-gallery-mode (WGM) lasers from the unmodified CsPbBr₃ QDs and the 2-hexyldecanoic acid (DA) modified CsPbBr₃ QDs. Thanks to the strong binding energy between DA ligand and QDs, the modified CsPbBr₃ QDs show much better optical properties than that of the common CsPbBr₃ QDs. In comparison with the unmodified CsPbBr₃ QDs, the lasing threshold of WGM lasers obtained from the modified CsPbBr₃ QDs is decreased from 126.81 and 261.97 μJ/cm² to 5.47 and 88.49 μJ/cm² under one-photon and two-photon pump excitation, respectively. Besides, WGM lasers based on the modified CsPbBr₃ QDs demonstrate higher stability than that of common CsPbBr₃ QDs WGM lasers under the same continuously pumping over ten hours. This work may not only enrich the application of the ligand modified CsPbBr₃ QDs but also provide a strategy for the facile design of low-threshold WGM lasers.

小型化固态激光器因其出色的性能而获得了长足的发展。在迄今为止发现的光学增益材料中，由于具有直接的带隙，窄的发射线宽和高的量子产率，CsPbBr ₃钙钛矿量子点（QD）被认为是最有希望的候选材料之一。在这里，我们报告由未修饰的CsPbBr ₃ QD和2-己基癸酸（DA）修饰的CsPbBr ₃ QDs制造耳语画廊模式（WGM）激光器。由于DA配体与QD之间具有很强的结合能，因此改性CsPbBr ₃ QD的光学性能比普通CsPbBr ₃ QD更好。与未修饰的CsPbBr _3相比QDs，从修饰的CsPbBr ₃ QDs获得的WGM激光器的激射阈值在单光子和双光子泵浦激发下分别从126.81和261.97μJ/ cm ^2降低到5.47和88.49μJ/ cm ²。此外，基于改性CsPbBr ₃ QD的WGM激光器在连续泵送十小时的情况下，比普通CsPbBr ₃ QDs WGM激光器具有更高的稳定性。这项工作不仅可以丰富配体修饰的CsPbBr ₃ QD的应用，而且还可以为低阈值WGM激光器的简便设计提供一种策略。