研究目的
Investigating the effect of shell growth rate on the structure and optical properties in blue-emitting ZnSe/ZnS QDs with narrow emission linewidth.
研究成果
Thermodynamic growth conditions, achieved by reducing the reactivity of shell precursors, enable the deposition of a coherent thick shell on core QDs without inducing interfacial defects, leading to high-quality blue-emitting ZnSe/ZnS QDs with superior optical properties.
研究不足
The study is limited to ZnSe/ZnS core/shell QDs and the effects of shell growth rate on their optical properties. The applicability of the findings to other core/shell systems is not explored.
1：Experimental Design and Method Selection:
The study involves the synthesis of ZnSe core QDs followed by the growth of ZnS shells under varying precursor reactivities to control the growth regime from kinetic to thermodynamic.
2：Sample Selection and Data Sources:
ZnSe core QDs of different sizes were synthesized and used as the base for ZnS shell growth.
3：List of Experimental Equipment and Materials:
Zinc oleate and 1-octanethiol were used as shell precursors, with varying molar ratios of Zn/oleic acid to control reactivity.
4：Experimental Procedures and Operational Workflow:
ZnS shell growth was performed by continuous injection of precursors at elevated temperature, with the growth regime controlled by the precursor reactivity.
5：Data Analysis Methods:
Optical properties were characterized by absorption and photoluminescence spectroscopy, and structural properties by TEM and XRD.
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