研究目的
Investigating the hydrothermal synthesis and upconversion properties of Sc2O3: Er3+, Yb3+ nanoparticles with detailed investigation of the energy transfer mechanism.
研究成果
Sc2O3: Er3+, Yb3+ nanoparticles about 19 nm were synthesized by a simple oleic acid-mediated hydrothermal process. The nanoparticles exhibit stronger upconversion luminescence, with red UCL enhanced by a factor of 4 compared to samples prepared by solvothermal method. The UCL enhancement is attributed to reduced surface groups and longer lifetimes. The material shows promise for achieving intense UCL with small size in biological fields.
研究不足
The study focuses on the synthesis and characterization of Sc2O3: Er3+, Yb3+ nanoparticles, with limited discussion on potential applications beyond biological fields. The experimental conditions and material compositions are specific, which may limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The Sc2O3: Er3+, Yb3+ nanoparticles were synthesized by a simple oleic acid-mediated hydrothermal process. X-ray diffraction (XRD), transmission electron microscopy (TEM), upconversion luminescence (UCL) spectra, and decay curves were used to characterize the resulting samples.
2：Sample Selection and Data Sources:
High purity raw materials of Sc2O3, Er2O3, and Yb2O3 powers were dissolved in dilute HNO3 and deionized water to obtain cationic nitrates solutions.
3：List of Experimental Equipment and Materials:
Powder X-ray diffraction (XRD) datum was collected using Cu-Kα radiation on an X-ray powder diffractometer (Rigaku D/Max IIA). Transmission electron microscopy (TEM) image was obtained by using a transmission electron microscope (JEM-2000EX). The UCL spectra were recorded with a spectrophotometer (Hitachi F-7000) and infrared spectra were performed by using a Triax 550 spectrometer pumped with a power-controllable 980 nm diode laser.
4：Experimental Procedures and Operational Workflow:
The resulting suspension was placed in a close Teflon-lined stainless steel autoclave with 50 ml capacity and heated at 180 °C for 24 h. After the autoclave was cooled to room temperature, naturally the precipitate was then centrifuged and washed several times with deionized water and absolute ethanol, respectively. The powder was obtained after being dried in a vacuum oven at 80 °C for 15 h and annealed 700 °C for 2 h.
5：Data Analysis Methods:
The decay times for red and green emissions are calculated by integrating the area under the corresponding decay curves with the normalized initial intensity.
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