研究目的
To investigate the structure variation and luminescence enhancement of BaLaMg(Sb, Nb)O6:Eu3+ double perovskite red phosphors based on composition modulation for applications in white LEDs.
研究成果
Doping with Nb5+ ions enhances luminescence intensity under NUV and blue light excitation, improves color purity, but reduces thermal stability due to narrowed band gap and increased energy loss. The phosphors are suitable for white LED applications.
研究不足
The phosphors are sensitive to temperature, showing reduced thermal stability with Nb5+ doping. The study is limited to solid-state synthesis and specific compositional ranges; other methods or dopants were not explored.
1：Experimental Design and Method Selection:
The study used a solid-state reaction method to synthesize BaLaMgSb1-xNbxO6:Eu3+ phosphors, with NH4Cl as a flux. X-ray diffraction (XRD) and Rietveld refinement were employed for structural analysis, and photoluminescence properties were measured using a fluorescent spectrophotometer.
2：Sample Selection and Data Sources:
Samples were prepared with varying Nb5+ concentrations (x from 0 to 1) using stoichiometric amounts of BaCO3, La2O3, MgO, Sb2O3, Nb2O5, NH4Cl, and Eu2O
3：List of Experimental Equipment and Materials:
Equipment included a ball mill with agate jar and zirconia balls, an oven, a muffle furnace, XRD (SmartLab TM 9kW, Rigaku), fluorescent spectrophotometer (Lumina), heating furnace for thermal quenching, and spectrophotometer (UV-3600, Shimadzu). Materials were analytically pure chemicals.
4：Experimental Procedures and Operational Workflow:
Starting materials were ball-milled for 8 hours with ethanol, dried at 90°C for 4 hours, and calcined at 1400°C for 4 hours. XRD patterns were collected from 5° to 80° at 5°/min. Luminescence and reflectance spectra were measured at specified excitations.
5：Data Analysis Methods:
Rietveld refinement was done using GSAS software. Band gap energy was estimated from reflectance spectra using the formula [F(R)hν]^2 vs. hν. Intensity ratios and CIE coordinates were calculated using appropriate software.
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X-ray diffractometer
SmartLab TM 9kW
Rigaku
Used for X-ray diffraction analysis to determine phase information and structure parameters of the phosphors.
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Spectrophotometer
UV-3600
Shimadzu
Used for ultraviolet-vis diffuse reflectance spectra to analyze band gap energy.
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Fluorescent spectrophotometer
Lumina
Used to measure excitation and emission spectra for luminescence properties.
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Ball mill
Used for milling the starting materials with zirconia balls and ethanol.
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Muffle furnace
Used for calcining the powders at high temperature.
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Heating furnace
Used for thermal quenching property measurements.
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