All-inorganic lead halide perovskite nanocrystals (NCs) have been widely investigated as highly promising optical gain materials due to their compelling electrical and optical properties. Although many efforts have been carried out, a deep understanding of perovskite NC vertical-cavity surface-emitting lasers (VCSELs) is elusive, which is very important in the development of photoelectronic integrated circuits. Along these lines, in this work, a low lasing threshold (22 μJ/cm2) single-mode VCSEL consisting of CsPbBr3 NCs film and two distributed Bragg reflectors was successfully constructed. The CsPbBr3 NCs were synthesized by using the supersaturated recrystallization method. Interestingly, benefiting from the strong coupling between the active layer and the optical field in the cavity, a single-mode lasing at 527 nm was demonstrated under femtosecond optical pumping. The carrier dynamics of the perovskite NC VCSEL was also thoroughly investigated by performing pump intensity-dependent time-resolved photoluminescence measurements. The typical gain-switching phenomenon was observed with an ultrafast decay of the laser pulse of ∼10 ps. Our work provides valuable insights for the implementation of the CsPbBr3 NC VCSEL for various optoelectronic applications.

中文翻译：

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CsPbBr3 钙钛矿纳米晶垂直腔面发射激光器的激光特性和载流子动力学

全无机卤化铅钙钛矿纳米晶体 (NCs) 由于其引人注目的电学和光学特性，已被广泛研究为非常有前途的光学增益材料。尽管已经进行了许多努力，但对钙钛矿 NC 垂直腔表面发射激光器 (VCSEL) 的深入了解仍然难以捉摸，这在光电集成电路的发展中非常重要。沿着这些思路，在这项工作中，低激光阈值（22 μJ/cm2个) 由 CsPbBr 组成的单模 VCSEL3个成功构建了 NCs 薄膜和两个分布式布拉格反射器。CsPbBr3个NCs的合成采用过饱和重结晶法。有趣的是，受益于活性层和腔内光场之间的强耦合，在飞秒光泵浦下展示了 527 nm 的单模激光。钙钛矿 NC VCSEL 的载流子动力学也通过执行泵浦强度依赖时间分辨光致发光测量进行了彻底研究。观察到典型的增益切换现象，激光脉冲的超快衰减为 ~10 ps。我们的工作为 CsPbBr 的实施提供了宝贵的见解3个用于各种光电应用的 NC VCSEL。