Controlled Synthesis of Near IR Emitting Metal Chalcogenide Quantum Dots for the Opto-electronic Applications

I. Hocaoglu, L. Eral Dogan, P. Dagtepe
Kuantag Nanotechnologies Development and Production Inc.,

Keywords: near IR, QDs, emission


Studies on the synthesis of Near IR emitting Quantum Dots have increased due to their potential in fiber optic communication systems, in photovoltaic cells, in NIR detectors-cameras, in biological applications including in vitro and in vivo cell and tissue imaging and tagging. There are few series of semiconductors made up of metal chalcogenides utilized in preparation of NIR-QDs. Several problems are encountered in the preparation and within the material itself in terms of colloidal and optical stability, quantum efficiency. In the study, QDs are synthesized colloidally in a single operation by continuous flow reactor. Reaction parameters affect the QD quality and quantity. The reaction parameters have been studied to prepare high quality particles in terms of optical and colloidal properties. These parameters are type and amount of reagent, capping agent and solvent, reaction time and, reaction temperature. In continuous flow reactor effective heat and mass transfer can be achieved. The size distribution of Near IR emitting metal chalcogenide QDs have emission profile over 700 nm. These QDs are optically and colloidally stable in different solvent in the long term even at low concentration with high PLQY.