研究目的
Investigating the effects of halogen anions on the photoluminescence properties of Sr4La6(SiO4)6M2:Eu3+ (M = F/Cl) phosphors for potential application in NUV white light emitting diodes.
研究成果
The SLSOF:Eu3+ and SLSOC:Eu3+ phosphors exhibit strong red emission under NUV excitation, with SLSOF:Eu3+ showing higher luminescence intensity due to the greater electronegativity of F?. Both phosphors have excellent thermal stability and high quantum efficiency, making them promising candidates for NUV white light emitting diodes.
研究不足
The study focuses on the photoluminescence properties and does not explore the mechanical or electrical properties of the phosphors. The synthesis process requires high temperatures, which may limit practical applications.
1：Experimental Design and Method Selection:
The phosphors were prepared via the traditional solid-state reaction process. The structure and photoluminescence properties were investigated using SEM, XRD, PL spectroscopy, UV-Vis spectra, and temperature-dependent emission spectra.
2：Sample Selection and Data Sources:
Stoichiometrical amounts of highly pure SrCl2, SrCO3, NH4F, SiO2, La2O3, and Eu2O3 were used as raw materials.
3：List of Experimental Equipment and Materials:
SEM (Hitachis-4800), XRD (D/MAX 2500TC), UV-Vis-NIR spectrophotometer (U-4100), fluorescence spectrometer (FLS920), and temperature controller.
4：Experimental Procedures and Operational Workflow:
The raw materials were mixed, pre-sintered at 750°C for 4h, and re-sintered at 1300°C for 6h. The samples were then ground into powder for characterization.
5：6h. The samples were then ground into powder for characterization.
Data Analysis Methods:
5. Data Analysis Methods: The band gaps were calculated using the Kubelka–Munk function, and the activation energy was evaluated using the Arrhenius equation.
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