氧空位缺陷对绿色长余辉发光材料α-Zn_3(PO_4)_2:Mn^(2+),Na^+发光性能的改善作用  

Effect of Oxygen Vacancies on Luminescent Performance of Green Long-Lasting Phosphor Material of α-Zn_3(PO_4)_2:Mn^(2+), Na^+

作　　者：谢婷[1] 郭鸿旭[1] 何裕能 陈垚[1] 陈棽[1] 林珩[1] 陈国良[1] 郑子山[1] 

机构地区：[1]闽南师范大学化学与环境学院,福建漳州363000

出　　处：《硅酸盐学报》2015年第7期969-974,共6页Journal of The Chinese Ceramic Society

基　　金：福建省科技厅产学研重大项目(2010H6029和2012H6026);福建省科技厅科技重点项目(2013H0053);福建省高等学校学科带头人培养计划;闽南师范大学研究生科研创新项目支持

摘　　要：利用溶胶–凝胶结合高温煅烧法制备了绿色长余辉发光材料α-Zn3(PO4)2:Mn2+,Na+。通过X射线衍射对产物的相结构进行分析,通过荧光光谱和热释光谱研究其发光本质,并探究了Na+掺杂量对余辉性质的影响。结果表明:制备的样品的结构与α-Zn3(PO4)2相同。样品发射峰位于548 nm处,为绿色发光材料,归属于Mn2+的4T1g–6A1g跃迁。当Na+掺杂量为4%时,样品的发光性能最佳。样品经过紫外光照射后,在暗室中目测其余辉时间约2 h。热释光谱分析表明,掺杂Na+可以增加晶体中Vo¨氧空位缺陷浓度。Vo¨氧空位缺陷浓度的提高有利于捕获更多的激发态电子,延缓激发态电子跃迁回基态,从而达到延长样品的余辉时间。The long-lasting phosphor （LLP） of α-Zn3（PO4）2：Mn2＋, Na＋ was prepared by a sol–gel method and subsequent conventional solid-state sintering. The phase composition of the sample was characterized by X-ray diffraction. The luminescent properties were investigated by using fluorescence spectra and thermoluminescence spectra, and the effect of Na＋-doped content on the luminescence properties of the samples was analyzed. The results show that the structure of the samples prepared is the same as that of α-Zn3（PO4）2. The emission peak of green afterglow phosphor is located at 548 nm, assigned to the 4T1g–6A1g transition of Mn2＋. The optimal luminescent property of the sample is obtained at the Na＋ content of 4% in mole. The long-lasting phosphorescence appears for ~ 2 h in the absence of the irradiation light source. The thermoluminescence spectra indicate that the doping of Na＋ ions results in the increase of Vo＆#168; oxygen vacancies. Vo＆#168; oxygen vacancies catch and store the excited electrons, and postpone their transition back to the ground levels, which can effectively extend the decay time of the samples.

关 键 词：长余辉发光材料 掺杂 正磷酸锌 发光机理 

分 类 号：TB321[一般工业技术—材料科学与工程]