Fabrication and bandgap engineering of doped ZnO microspheres by simple laser ablation in air

Nakamura, Daisuke; Shimogaki, Tetsuya; Tanaka, Toshinobu; Nagasaki, F.; Fujiwara, Yuki; Higashihata, Mitsuhiro; Ikenoue, Hiroshi; Okada, Tatsuo

doi:10.1117/12.2214054

Cited by 1 publication

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“…Cesium lead halide CsPbX 3 (X = Cl, Br, I) microspheres (MSs) were grown by a simple dual-source chemical vapor deposition method using CsX and PbX 2 powders as source material and bare silicon wafer as a substrate in a horizontal tube furnace. Similar to the growth of other semiconductor microspheres, the formation of the spherical shape is mainly due to the surface tension forces at high temperature. − Figure a shows a typical scanning electron microscopy (SEM) image of synthesized samples. It can be seen that the as-grown CsPbI 3 MSs dispersed on a piece of silicon wafer with diameters ranging from 0.2 to 1.0 μm, placing them in an ideal size regime for single-mode lasing as confirmed later.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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Single-mode laser is realized in a cesium lead halide perovskite submicron sphere at room temperature. All-inorganic cesium lead halide (CsPbX, 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 CsPbX spherical cavity at low threshold (∼0.42 μJ cm) 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.

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Section: Resultsmentioning

confidence: 99%