Solution-processed whispering-gallery-mode microsphere lasers based on colloidal CsPbBr3perovskite nanocrystals

Minghong Xie; Wenxiao Gong; Lei Kong; Yang Liu; Yang Mi; Heng Guo; Sheng-Nian Luo

doi:10.1088/1361-6528/ac4131

Solution-processed whispering-gallery-mode microsphere lasers based on colloidal CsPbBr₃perovskite nanocrystals

Nanotechnology. 2021 Dec 23;33(11). doi: 10.1088/1361-6528/ac4131.

Authors

Minghong Xie¹, Wenxiao Gong², Lei Kong¹, Yang Liu¹, Yang Mi¹, Heng Guo³, Sheng-Nian Luo¹

Affiliations

¹ Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
² School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
³ School of New Energy and Materials, State Key Laboratory of Oil and Gas Reservoir and Exploitation, Southwest Petroleum University, Chengdu 610500, People's Republic of China.

PMID: 34879353
DOI: 10.1088/1361-6528/ac4131

Abstract

Perovskite nanocrystals (NCs) have emerged as attractive gain materials for solution-processed microlasers. Despite the recent surge of reports in this field, it is still challenging to develop low-cost perovskite NC-based microlasers with high performance. Herein, we demonstrate low-threshold, spectrally tunable lasing from ensembles of CsPbBr₃NCs deposited on silica microspheres. Multiple whispering-gallery-mode lasing is achieved from individual NC/microspheres with a low threshold of ∼3.1μJ cm^-2and cavity quality factor of ∼1193. Through time-resolved photoluminescence measurements, electron-hole plasma recombination is elucidated as the lasing mechanism. By tuning the microsphere diameter, the desirable single-mode lasing is successfully achieved. Remarkably, the CsPbBr₃NCs display durable room-temperature lasing under ∼10⁷shots of pulsed laser excitation, substantially exceeding the stability of conventional colloidal NCs. These CsPbBr₃NC-based microlasers can be potentially useful in photonic applications.

Keywords: CsPbBr3 perovskite nanocrystals; low-threshold; microlasers; single-mode lasing; whispering-gallery-mode.