研究目的
Investigating the synthesis, controllable emission, and cytotoxicity of Tm3+/Er3+-doped and -co-doped α-NaYbF4 upconversion nanocrystals for potential applications in multicolor bioimaging and anti-counterfeiting.
研究成果
The study successfully synthesized Tm3+/Er3+-doped and -co-doped α-NaYbF4 nanoparticles with controllable emission colors and low cytotoxicity, making them promising for applications in multicolor bioimaging and anti-counterfeiting. The energy transfer mechanism among Yb3+/Tm3+/Er3+ was proposed, providing insights into the luminescence properties of these materials.
研究不足
The study focuses on the synthesis and basic characterization of Tm3+/Er3+-doped and -co-doped α-NaYbF4 nanoparticles. The potential for optimization in terms of luminescence efficiency and application-specific performance in bioimaging and anti-counterfeiting is not fully explored.
1：Experimental Design and Method Selection:
The study employed a facile hydrothermal method with oleic acid as the capping agent to synthesize Tm3+/Er3+-doped and -co-doped α-NaYbF4 nanoparticles.
2：Sample Selection and Data Sources:
Rare-earth nitrates RE(NO3)3 (RE3+ = Yb3+, Tm3+, and Er3+) were used as precursors.
3：List of Experimental Equipment and Materials:
A stainless-steel Teflon autoclave, X-ray diffractometer (XRD, D8 advance, Bruker), field emission scanning electron microscopy (FE-SEM, Merlin, Zeiss), high-resolution transmission electron microscopy (HRTEM, Talos F200X, FEI), spectrophotometer (Ocean Optics), and a 980 nm laser (BWT Beijing Ltd.) were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing ethanol, NaOH, deionized water, oleic acid, and RE(NO3)3 solution, followed by hydrothermal treatment at 120 °C for 12 h. The products were characterized by XRD, TEM, HRTEM, and EDS. Upconversion luminescence (UCL) properties were investigated under 980 nm laser excitation.
5：Data Analysis Methods:
The UCL intensity dependence on pump-laser power density was analyzed to understand the energy transfer mechanism. Fluorescence lifetime was measured to further demonstrate the energy transfer process.
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