In the past few decades, considerable efforts have been devoted to investigating and developing CQD lasers, and significant progress has been achieved. The well-separated delta function-like density of electronic states and their large optical oscillator strength promise CQD with low threshold and temperature-insensitive optical gain that make them excellent candidates for laser gain materials 12, 13. Low-dimensional CQD have attracted significant attention because of their unique structures, extraordinary optical properties, and low-cost preparation processes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. The chemosynthesis process supports the mass-produced potential of high-density integrated CQD microlasers, promoting CQD-based low-cost high-temperature microdevices. Moreover, single-mode CQD microlasers are obtained with tunable wavelengths across the entire visible spectral range. High-efficiency low-threshold CQD microlasers are demonstrated together with long-playing (40вЂ‰min) working stability even at 450вЂ‰K under pulsed laser excitation, which is the highest operational temperature for CQD lasers. This technology addresses the core issues of photoluminescence (PL) quenching effect and low optical gain in traditional CQD laser research. 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. 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. 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.

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.

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