研究目的
Investigating the upconversion fluorescence and upconversion-driven photodegradation properties of small lanthanide-doped Sr2YbF7 nanocrystals.
研究成果
Lanthanide-doped Sr2YbF7 nanocrystals were successfully synthesized and showed intense upconversion emissions from UV to NIR regions. The Sr2YbF7: Tm3+@TiO2 nanocomposites were applied to upconversion-driven photodegradation of RhB, demonstrating the potential of these nanocrystals in luminescence and photocatalysis.
研究不足
The study focuses on the synthesis and characterization of lanthanide-doped Sr2YbF7 nanocrystals and their application in upconversion-driven photodegradation. The limitations include the specific conditions required for synthesis and the focus on Rhodamine B as the photocatalytic volunteer.
1：Experimental Design and Method Selection:
The study employed a solvothermal method using oleic acid as the stabilizing agent to prepare lanthanide-doped Sr2YbF7 nanocrystals. The phase structure, morphology, and upconversion fluorescence properties were investigated.
2：Sample Selection and Data Sources:
Samples were prepared with different Ln3+ doping concentrations (Ln3+ = Ho3+, Tm3+, Er3+).
3：List of Experimental Equipment and Materials:
Materials included SrCl2, NH4F, oleic acid, TiO2, tetrabutyl titanate (TBOT), and Ln(NO3)
4：6H2O (Ln = Yb, Tm, Er, Ho). Equipment included a powder X-ray diffraction (XRD) apparatus, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), a fluorescence spectrophotometer, and X-ray photoelectron spectra (XPS). Experimental Procedures and Operational Workflow:
The synthesis involved mixing chemicals, transferring to an autoclave, heating, cooling, washing, and drying. Characterization involved XRD, TEM, HRTEM, fluorescence spectrophotometry, and XPS.
5：Data Analysis Methods:
The dependency of the UC emission intensities on pump power was analyzed, and the number of photons involved in the UC process was verified through power study.
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tetrabutyl titanate
TBOT
Sigma-Aldrich
Used in the synthesis of Sr2YbF7: Tm3+@TiO2 nanocomposites.
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Ln(NO3)3.6H2O
Ln = Yb, Tm, Er, Ho
Sigma-Aldrich
Used in the synthesis of lanthanide-doped Sr2YbF7 nanocrystals.
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high resolution transmission electron microscopy
HRTEM, JEOL 2100
JEOL
Used to characterize the morphology, microstructure, and element constitution of the samples.
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spectrophotometer
PerkinElmer, Lambda 35
PerkinElmer
Used to measure the concentrations of RhB.
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SrCl2
Sigma-Aldrich
Used in the synthesis of lanthanide-doped Sr2YbF7 nanocrystals.
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NH4F
Sigma-Aldrich
Used in the synthesis of lanthanide-doped Sr2YbF7 nanocrystals.
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oleic acid
Sigma-Aldrich
Used as the stabilizing agent in the synthesis of lanthanide-doped Sr2YbF7 nanocrystals.
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TiO2
Sigma-Aldrich
Used in the synthesis of Sr2YbF7: Tm3+@TiO2 nanocomposites.
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powder X-ray diffraction apparatus
D/Max 2500
Used to characterize the crystal structures of as-prepared samples.
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transmission electron microscopy
TEM
Used to characterize the morphology, microstructure, and element constitution of the samples.
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fluorescence spectrophotometer
R500
Used to record upconversion emission spectra under the excitation of a 980 nm laser.
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X-ray photoelectron spectra
XPS, ESCALAB 250Xi
Used to analyze the surface chemical environments.
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