研究目的
To investigate the effects of temperature and pressure, as well as post-sintering treatments, on residual porosity and optical properties of transparent Ce:YAG ceramics fabricated by spark plasma sintering.
研究成果
The highest in-line transmittance was obtained for the sample sintered at 1300°C. Post-sintering treatments affected residual porosity and optical properties, with HIP reducing porosity and annealing increasing it. Controlling residual porosity allows fine-tuning of optical properties for specific applications.
研究不足
The study focuses on the effects of residual porosity on optical properties but does not extensively explore the optimization of ceramic thickness for different power outputs of blue LEDs.
1：Experimental Design and Method Selection
Ce:YAG powder was synthesized by a co-precipitation method and sintered using spark plasma sintering (SPS) at various temperatures and pressures. Post-sintering treatments included annealing and hot isostatic pressing (HIP).
2：Sample Selection and Data Sources
Commercial YAG powder and cerium nitrate hexahydrate were used as raw materials. The synthesized powder was characterized by XRD and HRSEM.
3：List of Experimental Equipment and Materials
SPS apparatus (HP-D10 FCT Systeme), freeze drier (Labconco FreeZone 1), UV-VIS spectrophotometer (V530 Jasco), spectra-fluorometer (Fluorolog-3), confocal laser scanning microscope (Zeiss LSM880).
4：Experimental Procedures and Operational Workflow
The powder was synthesized, calcined, mixed with LiF as a sintering aid, and sintered by SPS. Post-sintering treatments were applied, and samples were characterized for microstructure and optical properties.
5：Data Analysis Methods
XRD peak broadening was analyzed using the Williamson–Hall method. Residual porosity was characterized by CLSM and HRSEM. Optical properties were measured using UV-VIS spectrophotometry and spectra-fluorometry.
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