研究目的
To synthesize color tunable quantum dots (QDs) based on Cu, Mn, Ag co-doped ZnInS core and ZnS outer-shell for potential applications in high quality white LED.
研究成果
Single-doped, dual-doped and multi-doped ZnInS/ZnS core-shell QDs with the average size of 3.85 nm were successfully synthesized. The as-prepared doped QDs exhibit tunable emission from green to near-red under a single excitation wavelength. Importantly, quasi-white emission can be achieved from the Cu, Mn, Ag multi-doped ZnInS/ZnS QDs, demonstrating their promising potential as alternative materials for white LED applications.
研究不足
The interaction of multi-doped metal-ions still lacks answers. Performance could be further improved by optimizing the synthesis.
1：Experimental Design and Method Selection
One-pot synthesis followed by a hot injection method with n-dodecanethiol (DDT) and oleylamine (OLA) as stabilizers in oil phase.
2：Sample Selection and Data Sources
Zinc acetate (Zn(AcO)2, 99.0%), indium sulfate (In2(SO4)3, 99.7%), copper chloride (CuCl2, 99.7%), silver nitrate (AgNO3, 99.9%), manganese acetate (Mn(AcO)2, 95.0%), n-dodecanethiol (DDT, 98%), oleic acid (OA, 98%), sulfur powder (S, 99.5%), oleylamine (OLA, 80%?90%) and 1-octadecene (ODE, 90%) were used.
3：List of Experimental Equipment and Materials
Shimadzu UV?3600 ultraviolet spectrophotometer, Shimadzu RF?5301PC fluorescence spectrophotometer, JEM?2100F HRTEM.
4：Experimental Procedures and Operational Workflow
Degassed mixture heated to 200 °C with stirring, growth continued at 200 °C for 1 h. ZnS shell formation steps conducted without intermediate purification.
5：Data Analysis Methods
PL quantum yield (QY) calculated by using the relative quantum efficiency of the QDs compared with the reference of Rhodamine 6G.
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