研究目的
To investigate the effects of Gd3+ codoping on the enhancement of the luminescent properties of NaBi(MoO4)2:Eu3+ red-emitting phosphors for application in white light-emitting diodes.
研究成果
Gd3+ codoping enhances the luminescent intensity of NaBi(MoO4)2:Eu3+ phosphors through energy transfer, with optimal performance at 6% Gd3+ concentration. The phosphors exhibit strong red emission suitable for blue-based white light-emitting diodes, offering high color purity and potential for warm white light applications.
研究不足
The study is limited to specific dopant concentrations and synthetic temperatures; higher temperatures lead to larger particle sizes that reduce luminescence intensity. The energy transfer mechanism is specific to Gd3+ and Eu3+ codoping, and applicability to other systems may vary.
1：Experimental Design and Method Selection:
The study used a sol-combustion method for synthesis due to its advantages of simple process, low temperature, and uniform product composition. The effects of synthetic temperature and dopant concentrations were systematically investigated.
2：Sample Selection and Data Sources:
High-purity starting materials including Gd2O3, Eu2O3, (NH4)6Mo7O24·4H2O, C6H8O7·H2O, Bi(NO3)3·5H2O, and CH3COONa·H2O were used. Eu3+ and Gd3+ concentrations ranged from 1 mol% to 8 mol% of Bi3+ sites.
3：List of Experimental Equipment and Materials:
Equipment included X-ray diffractometer (XRD, DX-2700), fluorescence spectrophotometer (F-4600), fluorescence spectrophotometer for lifetime (Fluorolog-3-Tau), UV-Vis-NIR diffuse reflectance spectrophotometer (Cary 5000), and X-ray photoelectron spectrometer (XPS, ESCALAB250). Materials were the chemical compounds listed.
4：0). Materials were the chemical compounds listed.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Stoichiometric amounts of materials were dissolved and mixed in distilled water, stirred at 60°C to form a sol precursor, heated to 600–800°C for 2 hours under atmospheric conditions, and cooled to room temperature.
5：Data Analysis Methods:
Crystal structures were analyzed using XRD with Rietveld refinement. Photoluminescence spectra, lifetimes, and reflectance spectra were measured. Energy transfer mechanisms were analyzed using Dexter theory and Reisfeld approximation.
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