(Sr1−xCax)WO4 and (Sr1−xCax)WO4:Eu3+ nanoparticles: synthesis and luminescence
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(Sr1−xCax)WO4 and (Sr1−xCax)WO4:0.05Eu3+ nanoparticles were synthesized by precipitation without using any complexing agent. The XRD patterns show that the obtained samples present a scheelite-type tetragonal structure without deleterious phase, and the increase of Ca concentration decreases the cell volume of materials. The TGA/DTA curve shows that the materials began to crystallize at temperature of 650 °C. The excitation and emission spectra of (Sr1−xCax)WO4 samples show bands originating from the charge transfers within WO4 2− groups. All (Sr1−xCax)WO4 samples show broad blue emission at room temperature. The excitation and emission spectra of (Sr1−xCax)WO4:0.05Eu3+ samples show bands originating from the charge transfers of Eu3+ ions. All (Sr1−xCax)WO4:0.05Eu3+ samples show prominent red emission at room temperature. The substitutions of Ca2+ ions to Sr2+ ions have obvious influence on luminescence properties. The intensity and quantum efficiency increase with the substituted Ca concentrations.
KeywordsScheelite CaWO4 SrWO4 Metal Tungstate BaWO4
This work is supported financially by Dr. Fund of Xi’an Polytechnic University (No. bs1341).
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