研究目的
Investigating the effect of Ce3+ concentration on the microstructure and optical characteristics of laser-sintered YAG ceramics for applications in white LEDs.
研究成果
The laser sintering process was efficient in producing Ce-doped YAG ceramics with high relative density, narrow grain size distribution, and homogeneous microstructure. The presence of a single valence Ce3+ was confirmed, crucial for high luminescence response. The study observed luminescence quenching and a redshift in the emission spectrum with increasing Ce concentration, attributed to lattice expansion and energy transfer processes between Ce ions.
研究不足
The study notes luminescence quenching at Ce concentrations above 0.5 mol% and a redshift in the emission spectrum with increasing Ce concentration. The high sintering speeds may result in incomplete removal of residual porosity.
1：Experimental Design and Method Selection:
The study employed a modified polymeric precursor method for synthesizing YAG:Ce powders, followed by laser sintering using a CO2 laser as the heating source.
2：Sample Selection and Data Sources:
Cerium-doped YAG powders were prepared in stoichiometries (Y1-xCex)3Al5O12 (X =
3：001, 003, 005, 01, 02) using yttrium nitrate, aluminum chloride, and ammonium cerium nitrate as raw materials. List of Experimental Equipment and Materials:
CO2 laser (GEM-100L–Coherent), X-ray diffractometer (Rigaku RINT 2000/PC), scanning electron microscope (JEOL JSM6510-LV), Fluorolog 3 Horiba spectrofluorometer.
4：Experimental Procedures and Operational Workflow:
Powders were calcined, pressed into disks, and sintered using the CO2 laser. The structure, microstructure, and luminescence properties were then characterized.
5：Data Analysis Methods:
XRD patterns were analyzed using the Rietveld method with GSAS software. SEM images were used to estimate average grain sizes. Photoluminescence measurements were performed to analyze emission and excitation spectra.
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