研究目的
To develop a facile growth-doping method in aqueous solution for synthesizing Cu-doped ZnSe QDs and investigate their potential applications in optoelectronic devices.
研究成果
High-quality Cu-doped ZnSe QDs with excellent green emission were successfully synthesized. The QDs have a cubic zinc blende structure with an average size of 3.0 nm, a PLQY of 20%, and a radiative lifetime of 113.8 ns. The ZnSe:Cu QDs thin film showed potential for color conversion applications, with a color coordinate at (0.2182, 0.4352) and a PLQY of 9.64% when excited by blue LEDs with DBR structures.
研究不足
The PLQY of the color conversion-based ZnSe:Cu QDs thin film is relatively low (9.64%), and the thickness of the thin film (~5 μm) may not fully absorb blue photons, leading to leaked blue light.
1：Experimental Design and Method Selection:
A growth-doping method in aqueous solution was used to synthesize ZnSe:Cu QDs with TGA as a stabilizer. The effects of Cu doping concentration, reaction temperature, and pH value were systematically investigated.
2：Sample Selection and Data Sources:
ZnSe:Cu QDs were synthesized under various conditions to study their optical properties and structural characteristics.
3：List of Experimental Equipment and Materials:
Zinc acetate dihydrate, cupric acetate monohydrate, sodium borohydride, selenium powder, thioglycolic acid, sodium hydroxide, and isopropyl alcohol were used. Equipment included a fluorescence spectrophotometer, TEM, HRTEM, XRD, XPS, and a zeta potential analyzer.
4：Experimental Procedures and Operational Workflow:
The synthesis involved preparing NaHSe as the Se precursor, mixing with Zn and Cu precursors, adjusting pH, and refluxing at 90°C. The QDs were characterized for their structural and optical properties.
5：Data Analysis Methods:
PL spectra, UV-Vis absorption, TEM, HRTEM, XRD, XPS, and zeta potential measurements were analyzed to determine the properties of ZnSe:Cu QDs.
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