Premium
Low Threshold Fabry–Pérot Mode Lasing from Lead Iodide Trapezoidal Nanoplatelets
Author(s) -
Zhong Yangguang,
Wei Qi,
Liu Zhen,
Shang Qiuyu,
Zhao Liyun,
Shao Ruiwen,
Zhang Zhepeng,
Chen Jie,
Du Wenna,
Shen Chao,
Zhang Jun,
Zhang Yanfeng,
Gao Peng,
Xing Guichuan,
Liu Xinfeng,
Zhang Qing
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801938
Subject(s) - lasing threshold , materials science , optoelectronics , wurtzite crystal structure , laser , semiconductor , iodide , whispering gallery wave , planar , population inversion , exciton , optics , condensed matter physics , chemistry , physics , wavelength , computer graphics (images) , resonator , zinc , computer science , metallurgy , organic chemistry
Lead Iodide (PbI 2 ) is a layered semiconductor with direct band gap holding great promises in green light emission and detection devices. Recently, PbI 2 planar lasers are demonstrated using hexagonal whispering‐gallery‐mode microcavities, but the lasing threshold is quite high. In this work, lasing from vapor phase deposition derived PbI 2 trapezoidal nanoplatelets (NPs) with threshold that is at least an order of magnitude lower than the previous value is reported. The growth mechanism of the trapezoidal NPs is explored and attributed to the synergistic effects of van der Waals interactions and lattice mismatching. The lasing is enabled by the population inversion of n = 1 excitons and the optical feedback is provided by the Fabry–Pérot oscillation between the side facets of trapezoidal NPs. The findings not only advance the understanding of growth and photophysics mechanism of PbI 2 nanostructures but also provide ideas to develop low threshold ultrathin lasers.