研究目的
To investigate the tunable luminescent properties of Sr4Al14O25: Eu2+/3+ phosphors via co-doping Tb3+ as the regulatory ion for the application of white-light-emitting diodes (wLEDs).
研究成果
The phosphor Sr4Al14O25: Eu2+/3+ with tunable luminescent properties was prepared by the conventional solid-state method in a non-reducing atmosphere. The emission spectrum of the sample Sr4Al14O25: 0.01Eu2+/3+, 0.06Tb3+ covered the whole visible spectral region and presented a good color rendering index of 63.3, indicating that the studied phosphor can be regarded as a candidate for the application of the wLEDs.
研究不足
The study focuses on the luminescent properties of Sr4Al14O25: Eu2+/3+ co-doped with Tb3+ and does not explore the potential for further optimization or application in different environments.
1：Experimental Design and Method Selection:
The phosphor was synthesized through the conventional solid-state reaction in a non-reducing atmosphere. The phase purity was examined by XRD analysis, and the luminescent properties were discussed systematically depending on the room- and low-temperature photoluminescence spectra.
2：Sample Selection and Data Sources:
The samples Sr4Al14O25 with varied Tb3+ concentration and the fixed concentration of Eu were synthesized.
3：List of Experimental Equipment and Materials:
SrCO3 (A.R.), Al(OH)3 (A.R.), MnCO3 (A.R.), Eu2O3 (4 N) and excess of 4 wt% of H3BO3 (A.R.) were used as raw materials.
4：Experimental Procedures and Operational Workflow:
The stoichiometric amount of raw materials were well homogenized in an agate mortar, and all samples were pre-sintered in corundum crucibles in air at 700 °C for 2 h, and further heat-treated at 1400 °C for 5 h with intermediate grindings in the processes.
5：Data Analysis Methods:
The crystal structures of synthesized samples were analyzed by x-ray diffraction (XRD). The emission and excitation spectra were detected with a Hitachi F-4600 fluorescence spectrophotometer.
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