研究目的
To investigate the enhancement of photoluminescence in alkali metal sulfate-doped zinc tungstate and understand the effects of different dopants on luminescence properties.
研究成果
Doping with alkali metal sulfates, particularly K2SO4, Rb2SO4, and Cs2SO4, enhances the photoluminescence intensity of zinc tungstate due to improved crystallinity and structural changes. Alkali metals with larger ionic radii and sulfates play key roles in modifying optical transitions, leading to higher emission in the blue wavelength region.
研究不足
Limitations include the inability of XRF equipment to detect Li+ and Na+ ions, potential effects of particle size on vibrational transitions, and the need for further optimization of doping concentrations and conditions.
1：Experimental Design and Method Selection:
The study used a solid-state reaction method to prepare doped zinc tungstate samples, with sintering at 800°C in air. Theoretical models included X-ray diffraction for phase confirmation and Rietveld refinement for structural analysis.
2：Sample Selection and Data Sources:
Samples were prepared with ZnO, WO3, and alkali metal sulfates (Li2SO4, Na2SO4, K2SO4, Rb2SO4, Cs2SO4) in molar ratios of 1:1:0.02, based on previous research for optimal photoluminescence enhancement.
3：02, based on previous research for optimal photoluminescence enhancement. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included X-ray diffractometer (RIGAKU Multiflex), fluorescence spectrophotometer (Hitachi F-7000), X-ray fluorescence spectrometer (ZSX Primus II), scanning electron microscope (JEOL JSM-5510), and laser Raman spectrometer (JASCO NRS-7200). Materials were ZnO (99.99%, Furuuchi Chemical Co., Ltd.), WO3 (99.99%, Kojundo Chemical Lab.), and alkali metal sulfates (>99.00%, Junsei Chemical Co., Ltd.).
4：0). Materials were ZnO (99%, Furuuchi Chemical Co., Ltd.), WO3 (99%, Kojundo Chemical Lab.), and alkali metal sulfates (>00%, Junsei Chemical Co., Ltd.). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Powders were mixed, ground in distilled water and 2-propanol, pressed into pellets, sintered at 800°C for 3 hours, ground into powders for testing, and characterized using XRD, XRF, SEM, Raman spectroscopy, and photoluminescence measurements.
5：Data Analysis Methods:
Data were analyzed using Rietveld refinement (Profex program) for structural parameters, and photoluminescence intensity was normalized and compared.
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X-ray diffractometer
Multiflex
RIGAKU
Used to measure the crystalline phase of the samples by X-ray diffraction with Cu Kα radiation.
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Fluorescence spectrophotometer
F-7000
Hitachi
Used to measure the photoluminescence of the samples.
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Scanning electron microscope
JSM-5510
JEOL
Used to observe the morphologies of the samples.
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Laser Raman spectrometer
NRS-7200
JASCO
Used to investigate the effects of structural order-disorder on the properties of the samples.
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X-ray fluorescence spectrometer
ZSX Primus II
Used to confirm the amount of dopant in the samples by X-ray fluorescence.
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ZnO
Furuuchi Chemical Co., Ltd.
Used as a starting powder in the solid-state reaction for sample preparation.
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WO3
Kojundo Chemical Lab.
Used as a starting powder in the solid-state reaction for sample preparation.
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Alkali metal sulfates
Junsei Chemical Co., Ltd.
Used as dopants in the solid-state reaction for sample preparation.
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