Li Xueyang, Jia Yuxi, Liu Meng, He Shutong, Guo Jingwei, Wu Kaifeng
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China.
CAS Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China.
Sci Adv. 2025 Jul 11;11(28):eadq9002. doi: 10.1126/sciadv.adq9002. Epub 2025 Jul 9.
Lead halide perovskites have emerged as promising candidates for a variety of optoelectronic devices, including lasing applications. However, the intrinsic stability issue of halide perovskites, especially under strong excitation conditions required for lasing, remains to be solved. Previous development of perovskite lasing has been largely limited to proof-of-concept devices with short operation time. Here, we report remarkably stable green lasing from colloidal CsPbBr perovskite nanocrystals dispersed in liquids placed in a Fabry-Pérot cavity under excitation by nanosecond pulses. The output intensity of this laser is stable for more than 10 days of continuous operation. Transient absorption measurements reveal that the optical power efficiency of the laser is limited by the relatively short gain lifetime of NCs (160 ps), which nevertheless can be enhanced to 4.2% by implementing a double-pulse excitation scheme. Deep-red liquid lasing from CsPbI nanocrystals has also been achieved, suggesting the feasibility to develop perovskite liquid lasers that are seamlessly tunable across the whole visible spectrum.
卤化铅钙钛矿已成为包括激光应用在内的各种光电器件的有前途的候选材料。然而，卤化钙钛矿的固有稳定性问题，特别是在激光所需的强激发条件下，仍有待解决。此前钙钛矿激光的发展在很大程度上局限于操作时间短的概念验证器件。在此，我们报道了在纳秒脉冲激发下，分散在置于法布里-珀罗腔中的液体中的胶体CsPbBr钙钛矿纳米晶体发出的显著稳定的绿色激光。该激光器的输出强度在连续运行10多天内保持稳定。瞬态吸收测量表明，该激光器的光功率效率受纳米晶体相对较短的增益寿命（160皮秒）限制，不过通过实施双脉冲激发方案，其光功率效率可提高到4.2%。还实现了CsPbI纳米晶体的深红色液体激光发射，这表明开发可在整个可见光谱范围内无缝调谐的钙钛矿液体激光器是可行的。
