研究目的
To improve the quality and performance of YAG:Ce3+ transparent ceramic phosphors (TCPs) for high-efficiency laser-driven (LD) lighting devices by controlling defects and crystal fields through the addition of MgO and SiO2 and annealing in air.
研究成果
The study demonstrates that optimizing YAG:Ce3+ TCPs by adding MgO and SiO2 and annealing in air can significantly improve their quality and performance for LD lighting. The luminous efficiency reaches 223 lm W?1, the best value reported for TCPs. The optimized TCPs show much better optical properties in LD lighting devices than commercial YAG:Ce3+ phosphor ceramics, indicating their potential for next-generation LD lighting.
研究不足
The study acknowledges that the thermal stability of the TCPs declines with the substitution of Mg2+–Si4+ for Al3+–Al3+, attributed to the enlarged Stokes shift. Additionally, the annealing process, while improving luminous efficiency, reduces the transmittance of the TCPs due to defects generated during the process.
1：Experimental Design and Method Selection:
The study involved the preparation of YAG:Ce3+ TCPs using nano-sized raw materials in a vacuum ambience, with the addition of nano-sized MgO and SiO2 to control defects. Annealing in air was performed to enhance luminous efficiency.
2：Sample Selection and Data Sources:
Nano-sized Y2O3 and Al2O3 were used as raw materials to synthesize YAG:Ce3+ TCPs.
3：List of Experimental Equipment and Materials:
Scanning electron microscopy (SEM) coupled with a cathodoluminescence (CL) system was used to identify defects and Ce3+ distributions in grains.
4：Experimental Procedures and Operational Workflow:
The TCPs were sintered in a vacuum ambience, followed by annealing in air. The transmittance, luminous efficiency, and conversion efficiency from blue laser light to white light were measured.
5：Data Analysis Methods:
The performance of the TCPs was analyzed based on transmittance curves, PL spectra, and temperature-dependent PL spectra.
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