Glycothermal Synthesis of Scheelite-Type LiEuW2O8 Nanophosphors and Their Structural Characterization
Glycothermal Synthesis of Scheelite-Type LiEuW2O8 Nanophosphors and Their Structural Characterization
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DOI：
10.1143/jjap.46.5879
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发表时间：
2007-09
影响因子：
1.5
通讯作者：
Ryo Kasuya;T. Isobe;Shinobu Yamao
中科院分区：
文献类型：
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作者：
Ryo Kasuya;T. Isobe;Shinobu Yamao
通过在1，4-丁二醇中高压釜处理由钨源和锂和铕（III）的乙酸盐形成LiEuW 2 O 8，即，通过糖热反应，探索了一种新的低温湿化学合成含WO 4单元的白钨矿型钨酸盐化合物的方法。当选择六水合十二钨磷酸（DPA）作为钨源时，在300 °C下的糖热反应产生单相的结晶白钨矿型LiEuW 2 O 8（LEW）纳米荧光体。相比之下，使用其他钨源不能获得纯相结晶LEW。根据电感耦合等离子体原子发射光谱、红外吸收光谱和拉曼光谱获得的结果，DPA衍生的样品含有PO 4基团，其可能取代了WO 4。PO 4基团在由WO 4基团组成的白钨矿型LEW的成核过程中起重要作用。我们还讨论了结晶白钨矿型LEW的非化学计量结构特性。LEW纳米荧光粉作为有机染料的替代品，具有近紫外和蓝光到红光的颜色转换功能，是一种很有前途的材料。
The formation of LiEuW2O8 from a tungsten source and acetates of lithium and europium(III) by autoclave treatment in 1,4-butylene glycol, i.e., by a glycothermal reaction, was studied to explore a novel low-temperature wet chemical synthesis of scheelite-type tungstate compounds with WO4 units. When dodecatungstophosphoric acid hexahydrate (DPA) was chosen as a tungsten source, a glycothermal reaction at 300 °C produced crystalline scheelite-type LiEuW2O8 (LEW) nanophosphors in a single phase. In contrast, phase-pure crystalline LEW was not obtained using the other tungsten sources. According to the results obtained by inductively coupled plasma atomic emission spectroscopy, infrared absorption spectroscopy, and Raman spectroscopy, the DPA-derived sample contained PO4 groups, which had probably substitutionally replaced WO4. PO4 groups could play a significant role in the nucleation of scheelite-type LEW, which is composed of WO4 groups. We also discuss the nonstoichiometric structural properties of the crystalline scheelite-type LEW. LEW nanophosphors, which are an alternative for organic dyes, may be one of promising materials because of their optical function of color conversion from near UV and blue to red.