Mg_2Y_8Si_6O_(26):Ce^(3+),Mn^(2+)荧光粉的制备及发光性能的研究

Synthesis and Luminescence Properties of Mg_2Y_8Si_6O_(26):Ce^(3+),Mn^(2+) Phosphor

高温固相法合成了Ce3+,Mn2+共掺的Mg2Y8Si6O26荧光粉,利用X射线粉末衍射仪(XRD)、荧光分光光度计对其结构和发光性能进行了研究。表明样品为纯相的Mg2Y8Si6O26晶体,属于六方晶系,空间群为P63/m。光谱数据表明Ce3+在该晶体中占有两种不同格位,分别为C3格位和C1h格位,通过激发和发射光谱对Ce3+在两种格位的发光进行了研究。在286nm光激发下Ce3+,Mn2+共激活Mg2Y8Si6O26的发射光谱除了在400nm有Ce3+的特征发射外,还在600nm处出现了Mn2+的特征发射,表明Ce3+和Mn2+之间存在能量传递。通过改变Mn2+的浓度实现了白光发射,它可用于紫外光激发的单一基质白光发射荧光粉。

Mg2Y8Si6O26∶Ce3＋,Mn2＋ phosphor was synthesized by the high temperature solid-state reaction,and the structure and luminescence properties were characterized by X-ray diffraction（XRD） and fluorescence spectrophotometer.The XRD pattern demonstrated that the synthetic material belongs to the hexagonal phase of Mg2Y8Si6O26 crystal without detectable impurity and space group P63/m.The excitation and emission spectrum showed that there exist two lattice positions for Ce3＋ in Mg2Y8Si6O26 crystal and their luminescence properties were compared.There are two emission peaks at 400 and 600 nm in the emission spectra under excitation at 286 nm,which come from Ce3＋ and Mn2＋ emission,respectively.It was demonstrated that there exists energy transfer between Ce3＋ and Mn2＋.The white light can be achieved by changing Mn2＋ concentration.It can be used as a potential single-phased white phosphor excited by ultraviolet light.