Lin Xuyang, Yang Yang, Li Xueyang, Lv Yongshun, Wang Zhaolong, Du Jun, Luo Xiaohan, Zhou Dongjian, Xiao Chunlei, Wu Kaifeng
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
University of Chinese Academy of Sciences, Beijing, China.
Nat Nanotechnol. 2025 Feb;20(2):229-236. doi: 10.1038/s41565-024-01812-0. Epub 2024 Nov 1.
Blue lasers play a pivotal role in laser-based display, printing, manufacturing, data recording and medical technologies. Colloidal quantum dots (QDs) are solution-grown materials with strong, tunable emission covering the whole visible spectrum, but the development of QD lasers has largely relied on Cd-containing red-emitting QDs, with technologically viable blue QD lasers remaining out of reach. Here we report on the realization of tunable and robust lasing using low-toxicity blue-emitting ZnSe-ZnS core-shell QDs that are compact in size yet still feature suppressed Auger recombination and long optical gain lifetime approaching 1 ns. These characteristics allow us to handle the blue QDs like laser dyes for liquid-state amplified spontaneous emission and lasing. The blue QD laser is operated under quasi-continuous-wave excitation by solid-state nanosecond lasers. A Littrow-configuration cavity enables narrow linewidth (<0.2 nm), wavelength-tunable, coherent and stable laser outputs without circulating the solution. These results indicate the promise of ZnSe-ZnS QDs to fill the 'blue gap' of QD lasers and to replace less stable blue laser dyes for a multitude of applications.
蓝光激光器在基于激光的显示、打印、制造、数据记录和医疗技术中发挥着关键作用。胶体量子点（QDs）是通过溶液生长的材料，具有覆盖整个可见光谱的强且可调谐发射，但量子点激光器的发展很大程度上依赖于含镉的红色发射量子点，技术上可行的蓝色量子点激光器仍难以实现。在此，我们报告了使用低毒性蓝色发射的ZnSe-ZnS核壳量子点实现可调谐且稳健的激光发射，这些量子点尺寸紧凑，但仍具有抑制的俄歇复合以及接近1纳秒的长光学增益寿命。这些特性使我们能够像处理激光染料一样处理蓝色量子点，用于液态放大自发发射和激光发射。蓝色量子点激光器在固态纳秒激光器的准连续波激发下运行。利特罗配置腔能够实现窄线宽（<0.2纳米）、波长可调谐、相干且稳定的激光输出，而无需循环溶液。这些结果表明ZnSe-ZnS量子点有望填补量子点激光器中的“蓝色空白”，并在众多应用中替代稳定性较差的蓝色激光染料。
