| 초록 |
Quantum dots (QDs) have attracted significant attention because of their unique size dependent properties, including a high absorption coefficient and widely tunable emission. Many efforts have been made to increase the efficiency of QDs by using a core/shell structure. This study was synthesized using the One-pot Synthesis and adjusting the precursor concentration to prepared CdSe/ZnS1-xSex QDs. For the synthesis of QDs, the Zn-Cd Precursor (zinc acetate (99.99%, Sigma-Aldrich), Cadmium oxide (99.99%, Sigma-Aldrich)) solution was maintained at 310 °C under continuous stirring in a 500 mL three-neck flask. The S-Se precursor (sulfur powder (99.98%, Sigma-Aldrich), selenium powder (99.99%, Sigma-Aldrich)) solution was then rapidly injected into the reaction flask. Subsequently the formed QDs were annealed at 300 °C for various reaction time under continuous stirring. Finally, we confirmed that the chemical composition gradient inside a single quantum dot and the composite behavior of the quantum dots changes with the precursor concentration ratio using results of the thermodynamics simulation, XRD, Cs-corrected STEM, UV-vis and PL. |
