Issue 10, 2023

Stable continuous-wave lasing from discrete cesium lead bromide quantum dots embedded in a microcavity

Abstract

All-inorganic cesium lead bromide (CsPbBr3) quantum dots (QDs) with high photoluminescence (PL) quantum efficiency have been reported as ideal gain materials for high-performance lasers. Nevertheless, isolated CsPbBr3 QDs have not achieved lasing emission (LE) due to finite absorption cross-section. Here, we demonstrate continuous-wave lasing of isolated CsPbBr3 QDs embedded in a microcavity. Distributed Bragg reflectors (DBRs), together with isolated CsPbBr3 QDs in a polymer matrix, are introduced to construct a vertical-cavity surface-emitting laser (VCSEL), which exhibits stable single-mode lasing emissions with an ultra-low threshold of 8.8 W cm−2 and a high Q factor of 1787. Such perovskite-based microcavity structures sustain highly stable excitons at room temperature and can provide an excellent experimental platform to further study the single-particle nano-lasers and quantum physics frontiers such as exciton–polariton condensation, single-photon emission, and optical quantum communication.

Graphical abstract: Stable continuous-wave lasing from discrete cesium lead bromide quantum dots embedded in a microcavity

Supplementary files

Article information

Article type
Communication
Submitted
12 apr 2023
Accepted
14 jul 2023
First published
14 jul 2023

Nanoscale Horiz., 2023,8, 1403-1410

Stable continuous-wave lasing from discrete cesium lead bromide quantum dots embedded in a microcavity

H. Zhang, W. Wen, B. Du, L. Zhou, Y. Chen, S. Feng, C. Zou, L. Wu, H. J. Fan, W. Gao, H. Sun, J. Shang and T. Yu, Nanoscale Horiz., 2023, 8, 1403 DOI: 10.1039/D3NH00139C

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