Abstract
Highly emissive semiconductor quantum dots (QDs) with tunable color are valuable in many applications such as solid state lighting and bio-imaging. Herein, we report a facile synthetic method to Au:ZnCdS and Au:ZnCdS/ZnS core/shell QDs with tunable emission color. The highly active Au precursor (HAuCl4) is prevented to be decomposed at high reaction temperature using 1-dodecanethiol (DDT) as the surface ligand. High-quality Au:ZnCdS/ZnS core/shell QDs are prepared and the highest photoluminescence (PL) quantum yield (QY) can achieve 42% by overcoating of ZnS layer over the bare Au:ZnCdS core QDs. Furthermore, through using Au+ ion as the primary dopants and trivalent cation In3+ as co-dopants, the PL QY can be enhanced significantly because compensation of In3+ ion-codoping for the charge imbalance from Au+-doping. This codoping strategy may be applied to other related optical materials to control the optical properties based on our understanding for physical mechanism.
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