1 research outputs found
Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres
Single-mode
laser is realized in a cesium lead halide perovskite
submicron sphere at room temperature. All-inorganic cesium lead halide
(CsPbX<sub>3</sub>, 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<sub>3</sub> spherical cavity
at low threshold (∼0.42 μJ cm<sup>–2</sup>) 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