title: Lasing in robust cesium lead halide perovskite nanowires.
abstract: The rapidly growing field of nanoscale lasers can be advanced through the discovery of new, tunable light sources. The emission wavelength tunability demonstrated in perovskite materials is an attractive property for nanoscale lasers. Whereas organic-inorganic lead halide perovskite materials are known for their instability, cesium lead halides offer a robust alternative without sacrificing emission tunability or ease of synthesis. Here, we report the low-temperature, solution-phase growth of cesium lead halide nanowires exhibiting low-threshold lasing and high stability. The as-grown nanowires are single crystalline with well-formed facets, and act as high-quality laser cavities. The nanowires display excellent stability while stored and handled under ambient conditions over the course of weeks. Upon optical excitation, Fabry-Pérot lasing occurs in CsPbBr3 nanowires with an onset of 5 μJ cm(-2) with the nanowire cavity displaying a maximum quality factor of 1,009 ± 5. Lasing under constant, pulsed excitation can be maintained for over 1 h, the equivalent of 10(9) excitation cycles, and lasing persists upon exposure to ambient atmosphere. Wavelength tunability in the green and blue regions of the spectrum in conjunction with excellent stability makes these nanowire lasers attractive for device fabrication.
authors: Department of Chemistry, University of California, Berkeley, CA 94720;
authors: Samuel W
authors: SW
authors: Eaton
authors: Department of Chemistry, University of California, Berkeley, CA 94720;
authors: Minliang
authors: M
authors: Lai
authors: Department of Chemistry, University of California, Berkeley, CA 94720; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;
authors: Natalie A
authors: NA
authors: Gibson
authors: Department of Chemistry, University of California, Berkeley, CA 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;
authors: Andrew B
authors: AB
authors: Wong
authors: Department of Chemistry, University of California, Berkeley, CA 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;
authors: Letian
authors: L
authors: Dou
authors: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;
authors: Jie
authors: J
authors: Ma
authors: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;
authors: Lin-Wang
authors: LW
authors: Wang
authors: Department of Chemistry, University of California, Berkeley, CA 94720; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Department of Physics, University of California, Berkeley, CA 94720; srl@berkeley.edu p_yang@berkeley.edu.
authors: Stephen R
authors: SR
authors: Leone
authors: Department of Chemistry, University of California, Berkeley, CA 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Kavli Energy NanoSciences Institute, Berkeley, CA 94720 srl@berkeley.edu p_yang@berkeley.edu.
authors: Peidong
authors: P
authors: Yang
keywords: inorganic; laser; nanowire; perovskite; stability