研究目的
To improve the light conversion efficiency of the upconversion phosphor NaYF4:Yb3+, Tm3+ for use in solar cells by removing the NaF phase from the surface of the NaYF4 host crystals.
研究成果
The removal of NaF from the surface of the NaYF4:Yb3+, Tm3+ phosphor reduces surface defects and enhances the photoluminescence characteristics of the upconversion phosphor. A simple surface treatment such as water washing is a useful way to improve the upconversion quantum efficiency.
研究不足
The study focuses on the effect of NaF removal on the photoluminescence characteristics of NaYF4:Yb3+, Tm3+ phosphor. The potential effects of other surface treatments or the combination of different treatments were not explored.
1：Experimental Design and Method Selection:
The study involved treating the surface of NaYF4:Yb3+, Tm3+ phosphor by removing the NaF phase through a simple procedure of washing, filtering, and drying.
2：Sample Selection and Data Sources:
A commercially available blue-emitting NaYF4:Yb3+, Tm3+ phosphor was used.
3：List of Experimental Equipment and Materials:
XRD (Philips X’pert Pro X-ray diffractometer), TEM (Technai G2), XPS system, PL measurement system with a 980 nm IR diode laser, spectrometer (Spex, 750M), and photomultiplier tube.
4：Experimental Procedures and Operational Workflow:
The phosphor was immersed in DI water, stirred, filtered, and dried. Structural and optical properties were analyzed using XRD, XPS, TEM, and PL measurements.
5：Data Analysis Methods:
The data were analyzed to confirm the removal of NaF and its effect on the photoluminescence characteristics.
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