研究目的
To develop gadolinium-based borate glasses doped with Dy3+ ions and investigate their luminescence properties for white light generation applications.
研究成果
The developed LGBaBDy and LGBiBDy glasses exhibit promising luminescence properties for white light generation, with optimal performance at 1.5 mol% Dy3+ concentration. The energy transfer is confirmed to be dipole-dipole via cross-relaxation. Color coordinates align with standard white light, suggesting potential use in white LEDs for energy-efficient lighting applications.
研究不足
The study is limited to specific glass compositions and Dy3+ doping concentrations; results may not generalize to other materials. The non-exponential decay analysis assumes specific interaction types (dipole-dipole), which might not cover all possible energy transfer mechanisms. Application is primarily for white LEDs, and scalability or commercial viability is not addressed.
1：Experimental Design and Method Selection:
The study used melt quenching technique to synthesize glass samples. The Inokuti-Hirayama model was applied to analyze non-exponential decay times, indicating dipole-dipole interactions.
2：Sample Selection and Data Sources:
Glass samples with compositions Li2O-Gd2O3-MO-B2O3-Dy2O3 (MO=Bi2O3, BaO) were prepared with varying Dy2O3 concentrations (0.0 to 2.5 mol%). High-purity chemicals (99.99%) were used.
3：0 to 5 mol%). High-purity chemicals (99%) were used.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included an electrically heated furnace for melting, alumina crucible, Abbe refractometer (ATAGO), Shimadzu Diffractometer XRD-6100, Shimadzu 3600 UV-VIS-NIR spectrophotometer, and Cary Eclipse fluorescence Spectrophotometer (Agilent technologies). Materials included H3BO3, Li2CO3, BaCO3, Gd2O3, Bi2O3, Dy2O3, and distilled water for density measurement.
4：Experimental Procedures and Operational Workflow:
Chemicals were mixed, melted at 1200°C for 3 hours, annealed at 500°C for 3 hours, then cut and polished. Measurements included density via Archimedes method, refractive index, XRD, absorption spectra, photoluminescence excitation and emission spectra, and decay time measurements at room temperature.
5：Data Analysis Methods:
Data were analyzed using software for diffraction analysis, and statistical methods for fitting decay curves with the IH model. Color coordinates and CCT were calculated using standard formulas.
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