CsPbBr3 Perovskite Quantum Dot Vertical Cavity Lasers with Low Threshold and High Stability

All-inorganic cesium lead bromide (CsPbBr3) perovskite quantum dots (QDs) have recently emerged as highly promising solution-processed materials for nextgeneration light-emitting applications. They combine the advantages of QD and perovskite materials, which makes them an attractive platform for achieving high optical gain with high stability. Here, we report an ultralow lasing threshold (0.39 μJ/cm) from a hybrid vertical cavity surface emitting laser (VCSEL) structure consisting of a CsPbBr3 QD thin film and two highly reflective distributed Bragg reflectors (DBRs). Temperature dependence of the lasing threshold and longterm stability of the device were also characterized. Notably, the CsPbBr3 QDs provide superior stability and enable stable device operation over 5 h/1.8 × 10 7 optical pulse excitations under ambient conditions. This work demonstrates the significant potential of CsPbBr3 perovskite QD VCSELs for highly reliable lasers, capable of operating in the short-pulse (femtosecond) and quasi-continuous-wave (nanosecond) regimes.