Single-source precursor synthesis of quinary AgInGaZnS QDs with tunable photoluminescence emission

A single source molecular precursor synthesis of new quinary Ag-In-Ga-Zn-S (AIGZS) QDs is presented. Dithiocarbamate complexes with varied Ag/In/Ga/Zn ratios were prepared from AgNO3, In(NO3)3, Ga(NO3)3 and Zn(diethyldithiocarbamate)2. The thermal decomposition these at 220 °C in oleylamine produces AIGZS emitting the visible to near-infrared region photoluminescence quantum yields (PL QYs) up 48.3%. For a (Ag + In Ga)/Zn molar ratio 1, intragap states likely involving Ag+ ions are responsible PL emission lifetime could reach 278 ns. marked increase (up 915 ns) was observed when decreasing 0.5. optical properties be maintained after transfer aqueous solution. should high potential for various applications due their tunability QYs.