Synthesis and Luminescent Properties of Calcium Tungstate Nanocrystals-II

There is a facile microemulsion-mediated hydrothermal procedure to synthesize the precursor of Eu³⁺-doped CaWO₄ nanoparticles.SEM shows that the nanoparticles are similar to sphere.The Eu³⁺-doped CaWO₄ phosphor was characterized by powder X-ray diffractometer.According to our measurements with XRD,the products belong to tetragonal structure.The effects of sintering temperature and time on the luminescence of the samples were investigated.The luminescence data indicate the optimum condition for heat-treatment of the precursor was at 600℃ for 2h.The effects of different content of Eu³⁺ on the luminescence of CaWO₄∶Eu³⁺ nanoparticles were also investigated,and the results display that luminescence intensity is enhanced with the slightly increasing of Eu³⁺ content,the optimum of Eu³⁺-doped concentration is 0.1 %(mole fraction).

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