Abstract
Developing mass-productive and high-performance microlaser particles (MLPs) by cost-effective approaches is highly promising for MLP-based optoelectronic applications, which remains a daunting challenge. Herein, we develop a novel solution-phase technique to realize the halide perovskite-based MLPs in a scalable manner. By regulating the dynamic process of crystallization in a two-step spin-coating procedure, the large-scale CsPbBr3 microcrystals are acquired. Importantly, the solution-processed CsPbBr3 microcrystals exhibit much stronger emission than the ones prepared by the chemical vapor deposition method, which is attributed to the low carrier trap density by the formation of a self-passivated and bromine-rich surface. These CsPbBr3 microcrystals with inverted pyramid morphology are demonstrated to support the whispering-gallery mode lasing, featuring low pump threshold and high Q-factor. Moreover, the technologically important single-mode lasing is achieved from the sub-5 μm-sized MLPs, thanks to the superior optical property. Eventually, the laser-emission-based gas sensor is demonstrated. These results represent a significant step toward scalable MLPs and related applications.
Highlights
Microlaser particles (MLPs) represent the compact laser sources where the active materials serve as the optical gain and the cavity resonator simultaneously.1–3 These microlaser particles (MLPs) greatly lower the complexity of a laser and feature a small mode volume or device size
The solution-processed CsPbBr3 microcrystals exhibit much stronger emission than the ones prepared by the chemical vapor deposition method, which is attributed to the low carrier trap density by the formation of a self-passivated and bromine-rich surface
These CsPbBr3 microcrystals with inverted pyramid morphology are demonstrated to support the whispering-gallery mode lasing, featuring low pump threshold and high Q-factor
Summary
Microlaser particles (MLPs) represent the compact laser sources where the active materials serve as the optical gain and the cavity resonator simultaneously. These MLPs greatly lower the complexity of a laser and feature a small mode volume or device size. Regarding the synthesis of WGM-MLPs, the most widely adopted technique is the chemical vapor deposition (CVD).15,21 This method enables the fabrication of high-quality single-crystals of IMHPs, which show favorable lasing performance.. The solution-processed CsPbBr3 microcrystals exhibit much stronger photoluminescence (PL) than the ones prepared by the CVD method, which is attributed to the low carrier trap density by the formation of a self-passivated and bromine-rich surface These CsPbBr3 microcrystals with inverted pyramid morphology are demonstrated to support the WGM lasing, featuring low pump threshold and high Q-factor. The technologically important single-mode lasing is achieved from the sub-5 μm-sized MLPs, thanks to their superior optical property These results represent a significant step toward mass-productive and high-performance MLPs, which could find a variety of applications in optoelectronics, as exemplified by the gas sensors
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