研究目的
Investigating the role of antisite defect centers in determining the phosphor characteristics of MgAl2O4, including its emission behavior and decay kinetics depending on the annealing temperature.
研究成果
The study concludes that MgAl2O4 can be used as both long persistent blue emitting and short persistent red emitting phosphor material depending on the annealing temperature. Antisite defect centers play a crucial role in determining the decay kinetics, with their concentration decreasing at higher annealing temperatures, leading to reduced lifetime values.
研究不足
The study is limited to the synthesis conditions and characterization techniques used, and the findings are specific to MgAl2O4. The role of other potential defect centers not investigated may also influence the phosphor characteristics.
1：Experimental Design and Method Selection:
The study involved synthesizing MgAl2O4 through sol-gel-combustion method at different annealing temperatures to investigate the role of antisite defect centers.
2：Sample Selection and Data Sources:
Stoichiometric amounts of Magnesium carbonate and Aluminum nitrate were used as precursor materials with citric acid as a fuel.
3：List of Experimental Equipment and Materials:
Instruments included RIGAKU Miniflex-600 diffractometer for XRD, Edinburgh CD-920 unit for PL spectra, and a TL reader for thermoluminescence measurements.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing precursor solutions, forming a gel, heating to form an ash-like product, and annealing at different temperatures.
5：Data Analysis Methods:
Emission spectra were analyzed using F-900 software, and lifetime values were determined using time-correlated single-photon-counting technique.
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