中文摘要：

利用快速燃烧合成方法制备了Sr2SiO4：Eu3＋纳米材料。用X射线粉末衍射、扫描电镜、稳态激发与发射光谱、高分辨发射光谱、位置选择激发光谱和发光衰减等测量对材料的结构、形貌和光致发光性质进行了研究。分析结果表明,通过二甲酰肼的快速燃烧,在800℃条件下反应3 min即可制得颗粒尺寸在80～100nm左右的α-Sr2SiO4：Eu3＋纳米材料,在紫外线激发下,所合成的样品具有良好的发光性能。由于纳米材料中表面格位的存在,Eu3＋的局域环境变得十分复杂,其发光寿命与体材料相比有明显的下降,并且发光衰减呈现由单指数衰减向双指数衰减转变的趋势。

英文摘要：

Nano-sized Sr2SiO4：Eu3＋ phosphors were successfully synthesized by a rapid synthetic route using the combustion method.Through the chemical reaction of Sr（NO3）2,Eu（NO3）3,and fumed silica,pure-phase of nano-size α-Sr2SiO4：Eu3＋ can be obtained by sintering under 800 ℃ for 3 min.The crystallization and morphology of the as-synthesized Sr2SiO4：Eu3＋ phosphors were investigated using XRD and scanning electron microscopy.The Sr2SiO4：Eu3＋ particle size is in a range of 80100 nm.Furthermore,luminescence properties of the nano-size Sr2SiO4：Eu3＋ phosphors,including photoluminescence,high-resolution emission spectra,site-selective excitation and emission spectra and excited-state decay curves are also systemically discussed in this paper and compared with that of Sr2SiO4：Eu3＋ prepared by the conventional high-temperature solid-state reaction method.Under UV light excitation,this phosphor shows intense red light.Due to the presence of the surface states that the Eu3＋ are located,the local environment of the Eu3＋ sites in nano-sized Sr2SiO4：Eu3＋ phosphor are more complicated compared with that of the bulk material,which leads to the decreased excited lifetime values.Furthermore,the luminescence decay curves of Eu3＋ changing from single-exponential to double-exponential due the presence of the surface states