Ag-In-Ga-S (AIGS) quantum dots (QDs) are eco-friendly alternatives to Pb/Cd-based QDs, offering tunable emission, high photoluminescence quantum yield (PLQY), and solution-based processing. However, their practical performance is constrained by the reactivity mismatch among Ag, In, and Ga precursors, which can be rationalized by Hard and Soft Acids and Bases (HSAB) considerations, hindering Ga/In incorporation and causing defect-related broadening, along with poor thermal-humidity stability that degrades color purity and device lifetimes in WLEDs. We present a ligand-mediated compositional engineering strategy where tuning oleylamine (OLA) content during synthesis regulates precursor reactivity and Ga/In incorporation, enabling fine control of emission wavelength, line width, and PLQY. Growing a heteroepitaxial AgGaS
Farid et al. (Fri,) studied this question.