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

Abstract

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.