摘要
采用溶胶-凝胶法合成了一系列适合紫外-近紫外激发的(1-X)Sr_2SiO_4:XTb^(3+)(X=0,0.01,0.02,0.03,0.04,0.05,0.06)绿色荧光粉,并采用X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱(PL)研究了样品的结构及发光性能.由XRD的检测结果可知,合成样品属于单斜晶系的β-Sr_2SiO_4相.由SEM图可知,所有样品都呈无规则块状结构.当监测波长为546 nm,样品的激发光谱的主峰位于370 nm处,属于Tb^(3+)的4f-4f特征跃迁吸收.当激发波长分别为285 nm和250 nm,所有样品在488 nm,547 nm,586 nm,623 nm处都出现了1个强发射峰,分别对应Tb^(3+)的~5D_4→~7F_6、~5D_4→~7F_5、~5D_4→~7F_4和~5D_4→~7F_3电子跃迁.最强发射峰位于547 nm处,呈现特征为绿光发射.随Tb^(3+)掺杂量增大,发射强度呈现出先增大后减小的变化趋势,即存在浓度猝灭效应.当Tb^(3+)掺杂量为X=0.03时,样品的发光强度最大.
A series of(1-X)Sr2SiO4:XTb3+(X=0,0.01,0.02,0.03,0.04,0.05,0.06)green phosphors were synthesized by the sol-gel method,which weresuitable for UV and near-UV excitation.The structure and the luminescence properties of phosphors were characterized by X-ray diffraction,scanning electron microscopy and fluorescence spectra.The results of XRD show that the synthesized samples belong to the monoclinicβ-Sr2SiO4 phase.It can be seen from the SEM diagram that all synthesized samples are presented as irregular block structures.The main excitation peak of Sr2SiO4:Tb3+phosphor appears at 370 nm when the monitoring waveleng this 547 nm,which belongs to the 4f-4f characteristic transition absorption of Tb3+.The emission spectra of Sr2SiO4:Tb3+phosphors shows four strong emission peaks at 488 nm,547 nm,586 nm,623 nm,which originates from 5D4→7F6,5D4→7F5,5D4→7F4 and 5D4→7F3 transitions of Tb3+when the excitation wavelengths are 285 nm and 250 nm,respectively.The strongest emission peak appears at 547 nm,characterized by green light emission.With the increase of doping amount of Tb3+,the emission intensity shows a trend of decreasing after increasing at the beginning period,that is,there is a concentration quenching effect.The luminous intensity of the sample is the strongest when the Tb3+doping amount is X=0.03.
作者
刘峰生
舒庆
张彩霞
楼鑫飚
LIU Fengsheng;SHU Qing;ZHANG Caixia;LOU Xinbiao(School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《有色金属科学与工程》
CAS
2018年第1期60-65,共6页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(21206062
21466013)
关键词
荧光粉
溶胶-凝胶法
稀土铽掺杂
硅酸锶
phosphor
sol-gel method
rare earth terbium doping
strontium silicate
