研究目的
To investigate the luminescent properties of GdAlO3:Tb3+ phosphors, focusing on improving particle microstructure and luminescence intensity through molten salt addition, and studying energy transfer mechanisms.
研究成果
The research successfully synthesized Tb3+-doped GdAlO3 phosphors with enhanced luminescent properties using molten salt addition. Key findings include the optimal Tb3+ concentration of 10 at% for maximum emission, the effectiveness of a NaCl/Na2SO4 mixture (5 wt% NaCl, 2:1 mass ratio to precursor) in increasing particle size and luminescence intensity, and the observation of energy transfer from Gd3+ to Tb3+. The study demonstrates the potential for improved phosphor performance in lighting and display applications, suggesting future work on other salt types and scalability.
研究不足
The study is limited to specific molten salt types (NaCl and Na2SO4) and their mixtures; other salts were not explored. The calcination process requires controlled atmospheres (H2) to prevent oxidation, which may complicate scaling. Particle size improvements are constrained by molten salt properties, and further optimization might be needed for industrial applications.
1：Experimental Design and Method Selection:
The study used ammonium bicarbonate co-precipitation technology to synthesize (Gd1–xTbx)AlO3 precursors, followed by calcination at high temperatures. Molten salts (NaCl and Na2SO4) were added to promote crystal growth and improve luminescent properties. Theoretical models include energy transfer from Gd3+ to Tb3+ and effects of molten salt composition on particle size and luminescence.
2：Sample Selection and Data Sources:
Samples were prepared with varying Tb3+ concentrations (x = 0–0.12) and different molten salt compositions. Raw materials included RE oxides (Gd2O3 and Tb4O7), aluminium nitrate, ammonium bicarbonate, and nitric acid, all of analytical or high purity grade.
3：12) and different molten salt compositions. Raw materials included RE oxides (Gd2O3 and Tb4O7), aluminium nitrate, ammonium bicarbonate, and nitric acid, all of analytical or high purity grade.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a centrifuge for separation, ultrasound technology for dispersion, drying oven at 80°C, furnace for calcination (600–1,300°C under H2 atmosphere), powder X-ray diffractometer (XRD, D8-ADVANCE, BRUKER Co), field-emission scanning electron microscope (FE-SEM, QUNATA FEG-250, FEI Co), and fluorescence spectrophotometer (FP-6500; JASCO Co) with integrating sphere (ISF-513; JASCO Co). Materials included Gd2O3, Tb4O7, Al(NO3)3?9H2O, NH4HCO3, HNO3, NaCl, Na2SO4, distilled water, and alcohol.
4：Experimental Procedures and Operational Workflow:
Precursors were synthesized by co-precipitation with ammonium bicarbonate, aged, centrifuged, washed, dispersed in ethanol using ultrasound, mixed with molten salts, dried, and calcined in two steps (600°C in air, then 800–1,300°C under H2). Phase analysis, morphology observation, and photoluminescence measurements were conducted.
5：2). Phase analysis, morphology observation, and photoluminescence measurements were conducted.
Data Analysis Methods:
5. Data Analysis Methods: XRD for phase identification, FE-SEM for particle morphology, fluorescence spectrophotometer for PL spectra and decay kinetics. Data were analyzed using exponential fitting for fluorescence lifetime.
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