研究目的
To develop a single-phase white light emitting phosphor for NUV-based white LEDs by synthesizing and characterizing Dy3+ single-doped and Dy3+/Tm3+ co-doped NaBi(WO4)2 phosphors, investigating their electronic structure, luminescence properties, and energy transfer mechanisms.
研究成果
The Dy3+/Tm3+ co-doped NaBi(WO4)2 phosphor exhibits tunable white light emission under UV excitation, with optimal composition achieving chromaticity coordinates close to the standard white point, making it a promising candidate for single-phase white LEDs.
研究不足
The study is limited to the specific host material NaBi(WO4)2 and dopants Dy3+ and Tm3+; potential limitations include the scalability of the synthesis method, the efficiency of energy transfer, and the need for further optimization for practical LED applications.
1：Experimental Design and Method Selection:
The study used a high-temperature solid-state reaction method for synthesis, first-principles calculations for electronic structure analysis, and various characterization techniques including SEM, XRD, and photoluminescence spectroscopy to investigate the properties of the phosphors.
2：Sample Selection and Data Sources:
Samples were prepared with nominal chemical formulas NaBi1-x(WO4)2:xDy3+ (x = 0,
3：03, 05, 07, 09, 11, 13) and NaBi91-x(WO4)
0.09Dy3+/xTm3+ (x = 0.05, 0.07, 0.09, 0.11, 0.13, 0.15) using raw materials Na2CO3 (A.R.), Bi2O3 (A.R.), WO3 (A.R.), Dy2O3 (99.99%), and Tm2O3 (99.99%).
4：09Dy3+/xTm3+ (x = 05, 07, 09, 11, 13, 15) using raw materials Na2CO3 (A.R.), Bi2O3 (A.R.), WO3 (A.R.), Dy2O3 (99%), and Tm2O3 (99%).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a field emission scanning electron microscope with energy-dispersive spectrometer, MiniFlex 600 powder diffractometer, scanning electron microscope (SEM, JSM-6700F), fluorescence spectrophotometer (SENS-9000, Zolix), and Vienna ab initio simulation package (VASP). Materials include Na2CO3, Bi2O3, WO3, Dy2O3, Tm2O3, and alumina crucible.
5：Experimental Procedures and Operational Workflow:
Raw materials were ground, heated to 600°C for 12 hours, sintered at 850°C for 12 hours, cooled to room temperature, and ground into powder. Characterization involved XRD for structure, SEM for morphology, and photoluminescence measurements for optical properties.
6：Data Analysis Methods:
Data analysis included first-principles calculations using VASP with PBE-GGA, band structure and DOS calculations, and analysis of PL spectra to determine emission intensities and chromaticity coordinates.
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