Hybrid organic–inorganic perovskites have emerged as promising gain media for tunable, solution-processed semiconductor lasers. However, continuous-wave operation has not been achieved so far^1,2,3. Here, we demonstrate that optically pumped continuous-wave lasing can be sustained above threshold excitation intensities of ~17 kW cm^–2 for over an hour in methylammonium lead iodide (MAPbI₃) distributed feedback lasers that are maintained below the MAPbI₃ tetragonal-to-orthorhombic phase transition temperature of T ≈ 160 K. In contrast with the lasing death phenomenon that occurs for pure tetragonal-phase MAPbI₃ at T > 160 K (ref. ⁴), we find that continuous-wave gain becomes possible at T ≈ 100 K from tetragonal-phase inclusions that are photogenerated by the pump within the normally existing, larger-bandgap orthorhombic host matrix. In this mixed-phase system, the tetragonal inclusions function as carrier recombination sinks that reduce the transparency threshold, in loose analogy to inorganic semiconductor quantum wells, and may serve as a model for engineering improved perovskite gain media.

混合的有机-无机钙钛矿已经成为可调谐，溶液处理的半导体激光器的有前途的增益介质。但是，到目前为止，^1,2,3尚未实现连续波操作。在这里，我们证明了在甲基铵碘化铅（MAPbI ₃）分布反馈激光器中，光泵浦连续波激射可以在高于阈值激发强度〜17 kW cm ^{–2的条件下}持续超过一个小时，并且保持在MAPbI _3的四方角以下。的-orthorhombic相变温度Ť  ≈与发生对纯四方相MAPbI激射死亡现象160 K.相反₃在Ť  > 160 K（参考文献⁴），我们发现，连续波增益在变得可能Ť  ≈从四方相包裹100 K时由常现有，较大的能带隙的斜方晶主体基质内的泵光产生。在这种混合相系统中，与无机半导体量子阱类似，四方包合物作为载流子复合阱，降低了透明性阈值，并且可以用作工程设计改进的钙钛矿增益介质的模型。