Tuning Optical Properties of AgInS2 Quantum Dots by the Change of Ag-In Stoichiometry for their Light-emitting Applications

Due to environmental friendly composition and low toxicity together with high quantum yield ternary I-III-IV semiconductor nanocrystals competes successfully with wellunderstood II-IV quantum dots. However, the undeveloped synthesis procedure, a vast number of compounds, and competing reactions as well as poor understanding of the origin of their optical properties leave a wide place to research. AgInS}}$_{\mathbf{2}}$ quantum dots were synthesized in aqueous media by adding of sulfur precursor solution to the solution containing Ag and different concentrations of In cations together with mercaptoacetic acid as a stabilizer. We have shown the complex dependence of the optical properties of AgInS}$_{\mathbf{2}}$ quantum dots on In to Ag precursor ratio arising from the changing of intrinsic point defect structure. This dependence opens the way of tuning their color emission for light-emitting devises creation.