Pumped Stimulated Vertical Cavity Surface Emitting Laser by Solution-processed Method

In this paper, It is fully demonstrated that the characteristics of the vertical cavity surface emitting laser (VCSEL) can be versatilely engineered by independent adjustment of the cavity and solution-processable CdSe/ZnS quantum dots (QDs), featuring low threshold (8.9 µJ/cm
²
), directional output (beam divergence of ≈ 10 degree), and favorable stability. Importantly, the lasing wavelength can be broadcasted to cover across the red, green, and blue region maintaining comparable thresholds, which is promising in developing single-source-pumped full-color visible lasers. The results unambiguously reveal the feasibility of CdSe/ZnS QDs as practical laser media.