研究目的
To synthesize and characterize Eu2+/Dy3+ activated GdAlO3 phosphors using solid state reaction method under nitrogen atmosphere, and to study their structural and luminescent properties for potential applications in color display.
研究成果
The synthesized GdAlO3:Eu2+ and GdAlO3:Eu2+;Dy3+ phosphors exhibit tunable blue emission with peaks at 515 nm and 419 nm, showing potential for color display applications. Energy transfer from Dy3+ to Eu2+ enhances emission, with optimal concentrations identified. CIE coordinates confirm color shift from bluish green to blue.
研究不足
The study is limited to specific dopant concentrations and synthesis conditions; potential limitations include sample agglomeration observed in SEM, and the need for further optimization of synthesis parameters for enhanced luminescent properties.
1：Experimental Design and Method Selection:
The study used solid state reaction method under nitrogen atmosphere to synthesize phosphors, with characterization via PXRD, SEM, TEM, and photoluminescence spectroscopy.
2：Sample Selection and Data Sources:
Samples were prepared with stoichiometric amounts of high-purity Gd2O3, Eu2O3, and Dy2O3 for singly doped and codoped phosphors.
3：List of Experimental Equipment and Materials:
Alumina crucible, muffle furnace, PXRD equipment, SEM, TEM, photoluminescence spectrometer. Materials included Gd2O3, Eu2O3, Dy2O3, and Aluminum Oxide from Sigma Aldrich.
4：Experimental Procedures and Operational Workflow:
Mixtures were heated in a muffle furnace at 1000°C for 1 hour and then at 1400°C for 4 hours under nitrogen atmosphere, with intermediate mixing. Characterization involved PXRD for crystal structure, SEM and TEM for morphology, and emission spectra recording under 354 nm excitation.
5：Data Analysis Methods:
Particle size calculated using Debey-Scherer formula, emission spectra analyzed for peak intensities and CIE chromaticity coordinates.
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Alumina Crucible
Used for heating the mixtures in the muffle furnace during synthesis.
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Muffle Furnace
Used for heating the samples at high temperatures under nitrogen atmosphere.
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Powder X-ray Diffraction Equipment
Used for crystal structure analysis of the phosphors.
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Scanning Electron Microscope
Used for surface morphology verification.
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Transmission Electron Microscope
Used for particle size distribution analysis.
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Photoluminescence Spectrometer
Used for recording emission spectra under excitation.
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Gadolinium Oxide
Sigma Aldrich
Starting material for phosphor synthesis.
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Europium Oxide
Sigma Aldrich
Dopant material for phosphor synthesis.
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Dysprosium Oxide
Sigma Aldrich
Dopant material for phosphor synthesis.
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Aluminum Oxide
Sigma Aldrich
Starting material for phosphor synthesis.
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