Synthesis of CaWO4:Eu3+ phosphor powders via ethylene glycol route and its optical properties
来源期刊：JOURNAL OF RARE EARTHS2012年第4期
论文作者：K.Gayatri Sharma N.Rajmuhon Singh
文章页码：310 - 314
摘 要：Eu3+ doped CaWO4 with tetragonal system were prepared at comparatively low temperature （125 ?C） in ethylene glycol medium. The phosphor was further investigated by X-ray diffractometer （XRD）, photoluminescence spectrophotometer （PL）, Fourier transform infra red （FT-IR） spectroscopy and transmission electron microscopy （TEM）. XRD analysis indicated a decrease in the unit cell volume of CaWO4 with increasing Eu3+ ion concentration. It indicated the homogeneous substitution of Ca2+ ions in CaWO4 by the Eu3+ ions. TEM images showed that the particle size ranged from 20 to 200 nm and it could extend the application of the nanoparticles. The photoluminescence study showed that the intensity of electric dipole transition （5D0→7F2） at 614 nm dominated over the magnetic dipole transition （5D0→7F1） at 592 nm. The optimum concentration of Eu3+ for the highest luminescence was found to be 20 at.%. The as prepared samples were found to be dis-persible in water and methanol.
K.Gayatri Sharma，N.Rajmuhon Singh
Department of Chemistry, Manipur University, Canchipur-795003, Imphal, Manipur, India
摘 要：Eu3+ doped CaWO4 with tetragonal system were prepared at comparatively low temperature （125 ?C） in ethylene glycol medium. The phosphor was further investigated by X-ray diffractometer （XRD）, photoluminescence spectrophotometer （PL）, Fourier transform infra red （FT-IR） spectroscopy and transmission electron microscopy （TEM）. XRD analysis indicated a decrease in the unit cell volume of CaWO4 with increasing Eu3+ ion concentration. It indicated the homogeneous substitution of Ca2+ ions in CaWO4 by the Eu3+ ions. TEM images showed that the particle size ranged from 20 to 200 nm and it could extend the application of the nanoparticles. The photoluminescence study showed that the intensity of electric dipole transition （5D0→7F2） at 614 nm dominated over the magnetic dipole transition （5D0→7F1） at 592 nm. The optimum concentration of Eu3+ for the highest luminescence was found to be 20 at.%. The as prepared samples were found to be dis-persible in water and methanol.
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