Photoluminescence properties of (Ba_{1鈭?span style='font-style: italic'>x}Eu_x)WO₄ red synthesized by the coprecipitation/calcination method

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• 作者：Wen-Lin Feng^a ; ^c ; ^{wenlinfeng@126.com} ; Ming-Fu Zhao^b ; Ji-Yuan Xue^b ; Xiao-Jiao Tian^a
• 关键词：Photoluminescence ; Phosphor ; Coprecipitation ; (Ba1&minus ; xEux)WO4
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 April, 2012
• 卷：521
• 期：Complete
• 页码：146-149
• 文件大小：552 K

摘要

In this paper, we report on the series of novel red phosphors (Ba_1鈭?em>xEu_x)WO₄ were synthesized by coprecipitation/calcination method. The morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photoluminescence (PL) excitation and emission spectra were also used to characterize the (Ba_1鈭?em>xEu_x)WO₄. The results showed that all phosphors present a scheelite-type tetragonal structure with space group (I4₁/a). The SEM images showed that the grains were like shuttles with sizes ranging from 3.0 to 7.0 渭m. The obtained (Ba_1鈭?em>xEu_x)WO₄ phosphor emitted red emission centered at 612 nm corresponding to the ⁵D₀ 鈫?#xA0;⁷F₂ transition of Eu³⁺ when was excited by 394 nm and 465 nm which well matched with near-ultraviolet and blue chips. The optimized concentration of Eu³⁺ was 20 mol.%for the highest PL emission intensity which was excited at 534 nm. The concentration quenching occurred when the Eu³⁺ concentration was beyond 20 mol.%.