Synthesis of CaWOb>4b>:Eu³⁺ phosphor powders via ethylene glycol route and its optical properties

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• 作者：K. Gayatri Sharma ; N. Rajmuhon Singh ; ^{rajmuhon@yahoo.co.in}
• 关键词：CaWO4 ; Eu3+ ; capping agent ; photoluminescence ; dispersible ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 期刊代码：7_10020721
• 类别：ms
• 出版时间：April, 2012
• 卷：30
• 期：4
• 页码：310-314
• 文件大小：641 K

摘要

Eu³⁺ doped CaWO4 with tetragonal system were prepared at comparatively low temperature (125 掳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 CaWOb>4b> with increasing Eu³⁺ ion concentration. It indicated the homogeneous substitution of Ca²⁺ ions in CaWOb>4b> 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 (⁵Db>0b>鈫?sup>7Fb>2b>) at 614 nm dominated over the magnetic dipole transition (⁵Db>0b>鈫?sup>7Fb>1b>) 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 dispersible in water and methanol.