研究目的
To tune and enhance the red upconversion emission of Er3+ in LiYF4 nanoparticles by adjusting Yb3+ concentrations and constructing core-shell nanostructures.
研究成果
Tetragonal-phased LiYF4:Yb3+/Er3+ UC NPs were successfully synthesized, and their UC emission was tuned from green to red by adjusting Yb3+ concentrations. The construction of LiYbF4:Er3+@LiYF4 core-shell nanostructures significantly enhanced the red UC emission intensity and R/G ratios. These findings have potential applications in biological imaging, diagnosis, and treatment.
研究不足
The overall integral upconversion intensity of LiYF4:Yb3+/Er3+ nanoparticles decreased with increased Yb3+ doping concentrations. The study focuses on the red upconversion emission enhancement but does not extensively explore other potential applications or limitations of the nanoparticles.
1：Experimental Design and Method Selection:
A modified solution-based method was used to synthesize tetragonal-phased LiYF4:Yb3+/Er3+ nanoparticles with different core-shell nanostructures.
2：Sample Selection and Data Sources:
Lanthanide chlorides (YCl3·6H2O, YbCl3·6H2O, ErCl3·6H2O,) were used as starting materials.
3：List of Experimental Equipment and Materials:
X-ray diffraction (XRD) patterns were recorded using the D/Max2550 diffraction meter. TEM images were measured by transmission electron microscopy (TEM) analysis. The UC emission signals were detected and collected by a spectrometer (SP2750i).
4：Experimental Procedures and Operational Workflow:
The synthesis involved heating a mixture of lanthanide chlorides, ODE, and OA to form a clear solution, followed by the addition of NH4F and LiOH in methanol, heating to remove methanol, and finally heating to 310 °C.
5：Data Analysis Methods:
The UC emission spectra and fluorescence lifetimes were analyzed to understand the upconversion mechanisms.
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