Quantum dot microlasers, as multifunctional optical source components, are of great importance for full-color high-pixel display, miniaturized coherent lighting, and on-chip integrated photonic and electronic circuits. Since the first synthesis of colloidal quantum dots (CQD) in the 1990s, motivation to realize high-performance low-cost CQD micro-/nanolasers has been a driving force for more than three decades. However, the low packing density, inefficient coupling of CQDs with optical cavities, and the poor thermal stability of miniaturized complex systems make it challenging to achieve practical CQD micro-/nanolasers, especially to combine the continuous working ability at high temperatures and the low-cost potential with mass-produced synthesis technologies. Herein, we developed close-packed CQD-assembled microspheres and embedded them in a silica matrix through the rapid self-aggregation and solidification of CdSe/ZnS CQD. This technology addresses the core issues of photoluminescence (PL) quenching effect and low optical gain in traditional CQD laser research. High-efficiency low-threshold CQD microlasers are demonstrated together with long-playing (40 min) working stability even at 450 K under pulsed laser excitation, which is the highest operational temperature for CQD lasers. Moreover, single-mode CQD microlasers are obtained with tunable wavelengths across the entire visible spectral range. The chemosynthesis process supports the mass-produced potential of high-density integrated CQD microlasers, promoting CQD-based low-cost high-temperature microdevices.

量子点微激光器作为多功能光源组件，对于全色高像素显示器，小型化相干照明以及片上集成光子和电子电路非常重要。自1990年代首次合成胶体量子点（CQD）以来，实现高性能，低成本CQD微型/纳米激光器的动力已超过三十年。但是，低填充密度，CQD与光学腔的耦合效率低以及小型复杂系统的热稳定性差，因此要实现实用的CQD微米/纳米激光器特别是将高温下的连续工作能力与低温条件结合起来具有挑战性。大量生产的合成技术具有成本潜力。在此处，我们开发了紧密堆积的CQD组装微球，并通过CdSe / ZnS CQD的快速自聚集和固化将它们嵌入二氧化硅基质中。该技术解决了传统CQD激光器研究中的光致发光（PL）猝灭效应和低光学增益的核心问题。演示了高效低阈值CQD微型激光器以及即使在450 K下在脉冲激光激发下仍可长时间（40分钟）工作的稳定性，这是CQD激光器的最高工作温度。此外，获得的单模CQD微激光器具有在整个可见光谱范围内可调的波长。化学合成过程支持高密度集成CQD微激光器的大规模生产潜力，促进了基于CQD的低成本高温微器件的发展。