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Published on: October 1, 2019
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Lasing in robust cesium lead halide perovskite nanowires
Samuel W Eaton1, Minliang Lai1, Natalie A Gibson2
1Department of Chemistry, University of California, Berkeley, CA 94720;
Summary
Cesium lead halide nanowires demonstrate tunable, low-threshold lasing with exceptional stability, advancing nanoscale laser technology. These robust materials offer a promising alternative for fabricating stable, efficient, and tunable laser devices.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Nanoscale lasers require new, tunable light sources for advancement.
- Perovskite materials offer tunable emission but often suffer from instability.
- Cesium lead halides present a stable alternative to traditional perovskites.
Purpose of the Study:
- To report the synthesis of cesium lead halide nanowires for nanoscale lasers.
- To investigate the lasing properties and stability of these nanowires.
- To assess their potential for device fabrication.
Main Methods:
- Low-temperature, solution-phase growth of cesium lead halide nanowires.
- Characterization of nanowire crystallinity, facets, and optical properties.
- Optical excitation to induce and measure Fabry-Pérot lasing and quality factors.
Main Results:
- Single crystalline cesium lead halide nanowires with well-formed facets were synthesized.
- Low-threshold Fabry-Pérot lasing observed in CsPbBr3 nanowires (onset 5 μJ cm⁻²).
- High quality factor (1,009 ± 5) and excellent stability under ambient conditions and prolonged excitation were achieved.
Conclusions:
- Cesium lead halide nanowires exhibit promising properties for nanoscale laser applications.
- Their tunable emission in the green/blue spectrum and high stability are advantageous.
- These nanowires are attractive candidates for fabricating robust and efficient laser devices.
