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Erschienen in:
01.05.2014
Molten salt synthesis, characterization, and luminescence of SrWO4, SrWO4:Tb3+ and SrWO4:Eu3+ powders
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 5/2014
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Abstract
SrWO4, SrWO4:Tb3+, and SrWO4:Eu3+ powders were synthesized by a method of molten salt. XRD patterns showed that the synthesized powders have a pure tetragonal scheelite structure without the presence of deleterious phases. Scanning electron microscopy images show that powders are in the range of 20–35 nm. The emission spectrum of SrWO4 shows the emission peak in the blue spectral region. The excitation spectra of SrWO4:Tb3+ and SrWO4:Eu3+ show the energy transfer from WO4
2− group to Tb3+ and Eu3+ ions with a high efficiency. The emission spectrum of SrWO4:Tb3+ shows the green emission at 545 nm corresponding to the 5D4 → 7F5 transition of Tb3+. The emission spectrum of SrWO4:Eu3+ shows the red emission located at 612 nm corresponding to the 5D0 → 7F2 transition of Eu3+. The asymmetry ratio of SrWO4:Eu3+ is found to be 5.54, which indicates that the Eu3+ ions are located in a lower symmetric site.