研究目的
To develop novel phosphors with tunable emission colors and high efficiency under near-UV excitation for solid-state lighting applications, specifically by investigating the energy transfer between Tb3+ and Eu3+ in Ca5(BO3)3F host.
研究成果
The Ca5(BO3)3F: Tb3+/Eu3+ phosphors exhibit tunable emission from green to red, efficient energy transfer via electric dipole-dipole interaction, high quantum yield (55.2%), and good thermal stability (T50 > 478 K), making them promising for solid-state lighting applications.
研究不足
The study is limited to the specific host material Ca5(BO3)3F and dopants Tb3+/Eu3+; potential limitations include scalability of synthesis, cost of rare-earth materials, and need for further testing in actual LED devices.
1:Experimental Design and Method Selection:
The study used a conventional solid-state reaction method to synthesize Ca5(BO3)3F: Tb3+/Eu3+ phosphors, with XRD for phase confirmation, and various spectroscopic techniques for luminescence analysis. Theoretical models included Dexter's energy transfer formula and Arrhenius equation for thermal stability.
2:Sample Selection and Data Sources:
Samples were prepared with varying concentrations of Tb3+, Eu3+, and charge compensators (Li+, Na+, K+), using raw materials like CaCO3, H3BO3, CaF2, Eu2O3, Tb4O7, and M2CO
3:List of Experimental Equipment and Materials:
Equipment included Rigaku D/max-ⅡB X-ray diffractometer, Philips-FEI Tecnai G2 S-Twin F20 TEM, JSM-6700F SEM with EDX, Edinburgh Instruments FLS920 fluorescence spectrometer with R928 photomultiplier tube and 450 W xenon lamp, and integrating sphere for quantum efficiency.
4:Experimental Procedures and Operational Workflow:
Raw materials were ground, sintered at 1050°C for 5 hours, cooled, and ground again. Measurements involved XRD for structure, TEM/SEM for morphology, PL/PLE spectra for luminescence, decay curves for lifetimes, and temperature-dependent spectra for thermal stability.
5:Data Analysis Methods:
Data were analyzed using GSAS for Rietveld refinement, linear fits for energy transfer mechanisms, and Arrhenius plots for activation energy calculation.
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