中文摘要：

用溶胶-凝胶法合成绿色长余辉荧光粉Sr2ZnSi2O7：Mn2＋,Tb3＋,并研究合成工艺及Tb3＋和Mn2＋掺量对荧光粉发光性能的影响。结果表明：合成Sr2ZnSi2O7的晶体结构为立方晶系;Sr2ZnSi2O7：Mn2＋,Tb3＋荧光粉在522nm附近的主要发射峰归属为Mn2＋的4T1（4G）→6A1g（6S）跃迁,Mn2＋→2O2-的电荷迁移带跃迁可产生一系列的激发峰;经紫外灯激发10min后,样品在暗场中可持续发光2h以上。热释发光实验证实：Tb3＋掺杂能有效降低材料能级陷阱,改善荧光粉的发光性能;Sr2ZnSi2O7：Mn2＋,Tb3＋荧光粉有一个合适的能级陷阱,为0.35eV。

英文摘要：

Green long afterglow phosphors Sr2ZnSi2O7：Mn2＋,Tb3＋ were synthesized by sol–gel method.Preparation techniques and dosages of Tb3＋ and Mn2＋,in relation to the luminescence properties of the phosphors,were systematically investigated.Results show that phosphor Sr2ZnSi2O7：Mn2＋,Tb3＋ has a cubic structure.Emission spectra of phosphor Sr2ZnSi2O7：Mn2＋,Tb3＋ around 522 nm are mainly attributed to Mn2＋ transition from 4T1（4G） to 6A1g（6S）.A series of excitation peaks are attributed to the charge transfer band transition of Mn2＋→2O2–.With 10 min ultraviolet light irradiation,this phosphor shows obvious long-lasting phosphorescence that can be clearly seen with the naked eye in a dark room over 2 h after the irradiation source has been removed.Thermoluminescence spectra indicated that the addition of Tb3＋ can greatly reduce the trap depth of phosphors to improve the luminescence properties of phosphors.The depth of 0.35 eV for phosphor Sr2ZnSi2O7：Mn2＋,Tb3＋ is suitable for the production of long-lasting phosphorescence.