研究目的
To synthesize and characterize the oxonitridosilicates RE6?xCa1.5xSi11N20O (RE = Yb, Lu; x ≈ 2.2) and investigate the luminescence properties of Lu6?xCa1.5xSi11N20O:Ce3+ as a potential new yellow-emitting phosphor for warm-white single phosphor converted light emitting diodes (1pcLEDs).
研究成果
The study successfully synthesized and characterized Yb6?xCa1.5xSi11N20O and Lu6?xCa1.5xSi11N20O, with the latter doped with Ce3+ showing promising yellow luminescence properties for warm-white 1pcLED applications. The emission extends more into the red spectral range compared to YAG:Ce3+, potentially offering improved color rendering index for lighting applications.
研究不足
The quantum efficiency of Lu6?xCa1.5xSi11N20O:Ce3+ is relatively low compared to industrially optimized YAG:Ce3+. Further research is needed to optimize the quantum efficiency for practical applications.
1：Experimental Design and Method Selection:
The synthesis involved solid-state reactions starting from REF3, CaH2, and “Si(NH)2” in a radiofrequency furnace at high temperatures. The crystal structure was determined using single-crystal X-ray diffraction.
2：Sample Selection and Data Sources:
Dark red crystals of Yb6?xCa
3：5xSi11N20O were obtained, and powder samples of Lu6?xCa5xSi11N20O:
Ce3+ were prepared for luminescence studies.
4：List of Experimental Equipment and Materials:
A radiofrequency furnace, SEM for morphology and composition analysis, single-crystal X-ray diffractometer, and UV/vis spectrophotometer were used.
5：Experimental Procedures and Operational Workflow:
The synthesis was performed under argon atmosphere, followed by characterization using various spectroscopic and diffraction techniques.
6：Data Analysis Methods:
The crystal structure was refined using SHELXL-97, and luminescence data were analyzed to determine emission properties.
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