摘要
采用溶胶凝胶-沉淀法制备掺杂Tb^(3+)的ZnO/ZnS绿色荧光粉。通过XRD与IR手段对所制备的绿色荧光粉的结构进行分析。XRD测试结果表明,荧光粉主要以ZnO和ZnS形式存在,其中ZnO属于六方相结构(No.74-0534)、ZnS属于三角晶结构(No.89-2427)。TEM显示荧光粉呈无规则块状,S的含量为1.85%(原子分数)。IR测试结果表明:绿色荧光粉主要含有Zn-S键、Zn-O键,其相应吸收峰的位置随退火温度的升高而发生变化。利用激发谱图和发射谱图的分析,探讨荧光粉的发光性能及发光机制。荧光粉制备的最佳退火温度为800℃,Tb^(3+)以磁偶极跃迁为主(^(5)D_(4)→^(7)F_(5));掺入ZnS可形成新的能带结构且增大复合几率,从而提高了荧光粉的发光性能,即ZnO/ZnS:Tb^(3+)荧光粉的发光性能强于ZnO:Tb^(3+)荧光粉的发光性能。
Tb^(3+):ZnO/ZnS phosphor was prepared by sol-gel-precipitation method.XRD results showed that the phosphor mainly exists in the form of ZnO and ZnS,where ZnO belongs to hexagonal phase structure(No.74-0534)and ZnS belongs to triangular crystal structure(No.89-2427).TEM showed that the phosphor is irregular and the content of S is 1.85%(atom fraction).IR results showed that Zn-S bond and Zn-O bond are the main components in the phosphor,and the positions of Zn-S bond and Zn-o bond change with the increase of annealing temperature.The luminescence properties and mechanism of the samples were discussed by the analysis of excitation and emission spectra.The optimal annealing temperature for phosphor preparation was 800℃,and Tb^(3+)was dominated by magnetic dipole transition(^(5)D_(4)→^(7)F_(5)).The results showed that add ZnS can form the new energy band structure,and increase the recombination probability,thus improve the luminescence performance of the green phosphors,that is,the luminescence performance of ZnO/ZnS:Tb^(3+)phosphors is stronger than that of ZnO:Tb^(3+)phosphors.
作者
张岚
王喜贵
Zhang Lan;Wang Xigui(Wulanchabu Medical College,Wulanchabu 012000,China;College of Chemistry and Environment Science,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2021年第2期232-237,I0002,共7页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(21261010)
内蒙古自治区高等学校科学研究项目(NJZY13046)
内蒙古师范大学“十百千”人才工程第二层次人选(学科带头人)研究基金项目(RCPY-2-2012-K-046)资助。
