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

• Main Authors: Zhang, Hongbo, Wen, Wen, Du, Bowen, Zhou, Lei, Chen, Yu, Feng, Shun, Zou, Chenji, Wu, Lishu, Fan, Hong Jin, Gao, Weibo, Sun, Handong, Shang, Jingzhi, Yu, Ting
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics; Single-photon Emission; Perovskite
• Online Access: https://hdl.handle.net/10356/171238
• Institution: Nanyang Technological University

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.