Microfluidic Synthesis of CsPbBr₃ Quantum Dots with Tunable Size and Enhanced Optoelectronic Properties via Temperature-Assisted Base-Acid Ligand Modulation

All-inorganic perovskite quantum dots (PQDs) have sparked a research boom due to their superior optoelectronic properties. However, current synthesis methods are complex and unsuitable for large-scale continuous production because the rapid reaction kinetics of quantum dots (QDs) make regulating their nucleation and growth challenging. Herein, we developed an efficient microfluidic technology using temperature-assisted base-acid ligand modulation to control the nucleation and growth of PQDs for mass fabrication. The obtained CsPbBr3 PQDs exhibited high dispersion, uniform sizes, and high photoluminescence quantum yield. Moreover, CsPbBr3 maintained high photoluminescence intensity for 120 min under UV irradiation, demonstrating good stability. These results provide a promising pathway for large-scale PQD production, which is crucial for advanced optoelectronic applications. Compared with the traditional hot injection (HI) and ligand-assisted reprecipitation (LARP) methods, microfluidic technology significantly saves materials and reagents. The microfluidic technology is also helpful for precisely controlling the nucleation process of QD growth.