Solution-processed semiconductor lasers have achieved much success across the nanomaterial research community, including in relation to organic semiconductors^1,2, perovskites^3,4 and colloidal semiconductor nanocrystals^5,6. The ease of integration with other photonic components and the potential for upscaling using emerging large-area fabrication technologies (such as roll-to-roll⁷) make these lasers attractive as low-cost photonic light sources that can find use in a variety of applications, including integrated photonic circuitry^8,9, telecommunications^10,11, chemo-/bio-sensing^12,13, security¹⁴ and lab-on-chip experiments¹⁵. However, for fibre-optic or free-space optical communications and eye-safe LIDAR applications, room-temperature solution-processed lasers have remained elusive. Here, we report a solution-processed laser comprising PbS colloidal quantum dots integrated on a distributed feedback cavity, with tunable lasing wavelength from 1.55 μm to 1.65 μm. These lasers operate at room temperature and exhibit linewidths as low as ~0.9 meV.

溶液处理的半导体激光器在纳米材料研究界取得了很大的成功，包括与有机半导体^1,2、钙钛矿^3,4和胶体半导体纳米晶体^5,6有关。易于与其他光子组件集成以及使用新兴的大面积制造技术（例如卷对卷⁷）进行放大的潜力使这些激光器成为具有吸引力的低成本光子光源，可用于各种应用，包括集成光子电路^8,9、电信^10,11、化学/生物传感^12,13、安全¹⁴和芯片实验室实验¹⁵ . 然而，对于光纤或自由空间光通信和人眼安全激光雷达应用，室温溶液处理激光器仍然难以捉摸。在这里，我们报告了一种溶液处理激光器，包括集成在分布式反馈腔上的 PbS 胶体量子点，可调谐激光波长为 1.55 μm 至 1.65 μm。这些激光器在室温下工作，线宽低至~0.9 meV。