Controlled morphology and EDTA-induced pure green upconversion luminescence of Er3+/Ho3+-Yb3+ co-doped NaCe(MoO4)2 phosphor
Controlled morphology and EDTA-induced pure green upconversion luminescence of Er3+/Ho3+-Yb3+ co-doped NaCe(MoO4)2 phosphor
复制标题
DOI：
10.1039/c5ra09103a
复制
发表时间：
2015-08
期刊：
影响因子：
3.9
通讯作者：
Xingxing Yang;Z. Fu;Guofeng Liu;Chunpeng Zhang;Yanling Wei;Zhijian Wu;Tianqi Sheng
中科院分区：
文献类型：
--
作者：
Xingxing Yang;Z. Fu;Guofeng Liu;Chunpeng Zhang;Yanling Wei;Zhijian Wu;Tianqi Sheng
采用水热法在180 °C、pH = 9条件下合成了NaCe（MoO 4）2：Er 3 +/Ho 3+，Yb 3+上转换荧光粉。采用X射线粉末衍射（XRD）和场发射扫描电子显微镜（FE-SEM）对样品的晶相、尺寸和形貌进行了系统的表征。实验结果表明，乙二胺四乙酸（EDTA）是决定纳米粒子空间排列的关键因素，也是影响最终产物粒度分布的重要因素。此外，我们还发现EDTA可以通过改变晶格参数来调节Er ~（3+）/Ho ~（3+）-Yb ~（3+）共掺NaCe（MoO_4）_2的带边吸收，从而首次实现了它们的双色可调发光。作为掺杂剂浓度的函数的行为的研究都进行了描述。系统地描述了不同的UC机制的样品与无EDTA以及。研究发现，在0.1 g EDTA的辅助下制备的Er 3 +/Ho 3 +-Yb 3+共掺杂NaCe（MoO 4）2中，出现了一种提高绿色UC发光的同时抑制红色UC发光的新途径，提高了单一绿色发光的效率。
Uniform and well-crystallized NaCe(MoO4)2: Er3+/Ho3+, Yb3+ up-conversion (UC) phosphors have been successfully synthesized by a facile hydrothermal route at 180 °C for 12 h at pH = 9. The crystalline phase, size and morphology were systematically characterized using powder X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). The experimental results showed that the ethylene diamine tetraacetic acid (EDTA) was a key parameter which not only determined their spacial arrangement, but also affected the size distributions of the final products. Moreover, we found that EDTA could tune the band edge absorption of the molybdate system by changing the lattice parameters, so as to realize their bicolour tunable luminescence of Er3+/Ho3+-Yb3+ co-doped NaCe(MoO4)2 for the first time. Studies of the behavior as a function of dopant concentration were all described. The different UC mechanisms of the samples with and without EDTA were systematically depicted as well. It was found that an innovative route to increase the green UC emission and simultaneously suppress red UC emission in Er3+/Ho3+-Yb3+ co-doped NaCe(MoO4)2 prepared with the assistance of 0.1 g EDTA, which enhanced the efficiency of the single green color.