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Continuous‐Wave Lasing in Cesium Lead Bromide Perovskite Nanowires
Author(s) -
Evans Tyler J. S.,
Schlaus Andrew,
Fu Yongping,
Zhong Xinjue,
Atallah Timothy L.,
Spencer Michael S.,
Brus Louis E.,
Jin Song,
Zhu X.Y.
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700982
Subject(s) - lasing threshold , materials science , perovskite (structure) , polariton , optoelectronics , continuous wave , nanowire , halide , population inversion , laser , exciton , resonance (particle physics) , excitation , condensed matter physics , optics , atomic physics , wavelength , physics , inorganic chemistry , chemistry , quantum mechanics , chemical engineering , engineering
Abstract Lead halide perovskite nanowires (NWs) have been demonstrated in pulsed lasing with high quantum yields, low thresholds, and broad tunability. However, continuous‐wave (CW) lasing, necessary for many optoelectronic applications, has not been achieved to date. This is thought to be due to many‐body screening, which reduces the excitonic resonance enhancement of the oscillator strength at high excitation densities necessary for population inversion. Here CW lasing in CsPbBr 3 perovskite NWs is reported. Analysis of the cavity modes and their temperature dependence reveals that both CW and pulsed lasing originate from polariton modes near the bottleneck region on the lower polariton branch, with a vacuum Rabi splitting of 0.20 ± 0.03 eV. These findings suggest that lead halide perovskite NWs may serve as low‐power CW coherent light sources and as model systems for polaritonics in the strong‐coupling regime.