Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method
Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method
复制标题
水辅助固相反应(WASSR)法温和条件无高温合成Eu2掺杂原硅酸钡纳米荧光粉
DOI：
10.1016/j.jallcom.2019.02.295
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发表时间：
2019
影响因子：
6.2
通讯作者：
Mineo Sato
中科院分区：
文献类型：
--
作者：
Yusuke Shibuta;Takuya Hasegawa;Sun-Woog Kim;Kazuyoshi Uematsu;Kenji Toda;Mineo Sato
采用本课题组开发的水辅助固相反应法制备了Ba2SiO4：Eu2+绿色发光纳米荧光粉，其最低温度为220 °C。利用不同的Ba2SiO4和硅源制备了Ba2SiO4，反应仅在Ba2SiO4的Ba2SiO4和无定形SiO_2的混合物中进行。此外，X射线粉末衍射结果表明，Ba2SiO4相是以Ba2[SiO_2(OH)_2]_2为中间相合成的。由于采用了温和的条件，没有高温处理，得到的一次粒径为15-20 nm。此外，在360→nm的近紫外光激发下，Eu2+的4f65d1 4f7跃迁产生了绿色发光。结果表明，在不使用还原气体的情况下，Eu3+被部分还原为Eu2+。
A green-emissive Ba2SiO4:Eu2+nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 °C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)2·8H2O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4phase was formed through a Ba2[SiO2(OH)2]2phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15–20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f65d1→4f7transition of Eu2+under the near UV excitation of 360 nm. The result indicates that Eu3+is partly reduced to Eu2+without using reduction gas.