3 years ago

Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres

Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres
Bing Tang, Long Zhang, Liaoxin Sun, Anlian Pan, Weihao Zheng, Hongxing Dong, Fangfang Sun, Qi Wang, Xiongwei Jiang
Single-mode laser is realized in a cesium lead halide perovskite submicron sphere at room temperature. All-inorganic cesium lead halide (CsPbX3, X = Cl, Br, I) microspheres with tunable sizes (0.2–10 μm) are first fabricated by a dual-source chemical vapor deposition method. Due to smooth surface and regular geometry structure of microspheres, whispering gallery resonant modes make a single-mode laser realized in a submicron sphere. Surprisingly, a single-mode laser with a very narrow line width (∼0.09 nm) was achieved successfully in the CsPbX3 spherical cavity at low threshold (∼0.42 μJ cm–2) with a high cavity quality factor (∼6100), which are the best specifications of lasing modes in all natural nano/microcavities ever reported. By modulating the halide composition and sizes of the microspheres, the wavelength of a single-mode laser can be continuously tuned from red to violet (425–715 nm). This work illustrates that the well-controlled synthesis of metal cesium lead halide perovskite nano/microspheres may offer an alternative route to produce a widely tunable and greatly miniaturized single-mode laser.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b04496

DOI: 10.1021/acsnano.7b04496

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