研究目的
To develop high-efficiency red-emitting phosphors for high-performance white light-emitting diodes (LEDs) with good thermal stability and high color purity.
研究成果
The novel Ca2Gd(1-x)EuxSbO6 red-emitting phosphors exhibit high efficiency, good thermal stability, and high color purity, making them promising candidates for use in white LEDs. The optimal doping concentration of Eu3+ ions was found to be x = 0.5, with an internal quantum efficiency of 73% and color purity of 94.9%. The phosphors demonstrated stable emission at high temperatures and were successfully applied in a prototype white LED device.
研究不足
The study focuses on the synthesis and photoluminescence properties of Ca2Gd(1-x)EuxSbO6 phosphors, with potential limitations in scalability and cost-effectiveness for industrial applications. The thermal stability and quantum efficiency are high but may require further optimization for specific LED applications.
1：Experimental Design and Method Selection:
High-temperature solid-state reaction method was used to synthesize a series of Ca2Gd(1-x)EuxSbO6 red phosphors with different Eu3+ doping concentrations.
2：Sample Selection and Data Sources:
Raw materials including CaCO3, Gd2O3, Sb2O5, and Eu2O3 were weighed and mixed based on stoichiometric amounts.
3：List of Experimental Equipment and Materials:
Powder X-ray diffraction (PXRD) with Cu-Kα radiation, Edinburgh FS5 spectrometer, integrating sphere spectroradiometer (HAAS2000, Everfine).
4：Experimental Procedures and Operational Workflow:
The mixed powders were calcined at 1500°C for 6 h in air, cooled to room temperature, and ground into fine powders. PXRD, PLE, PL spectra, decay curves, and IQE were measured.
5：Data Analysis Methods:
The PXRD pattern Rietveld refinement was performed with GSAS, and the Vesta software was used for generating the crystal structure. The luminescence properties were analyzed based on the measured spectra.
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