物理化学学报 >> 2006, Vol. 22 >> Issue (03): 286-290.doi: 10.3866/PKU.WHXB20060306

研究论文 上一篇    下一篇

CaSiO3∶Pb, Mn荧光粉的ZnO∶Al包覆研究

赵婧; 李怀祥; 王安河; 周宏伟; 左相青   

  1. 山东师范大学物理与电子科学学院; 山东师范大学化学化工与材料科学学院, 济南 250014
  • 收稿日期:2005-08-10 修回日期:2005-10-17 发布日期:2006-03-10
  • 通讯作者: 李怀祥 E-mail:huaixiangli@yahoo.com

A Study of CaSiO3∶Pb, Mn Phosphors Coated by ZnO∶Al

ZHAO Jing; LI Huai-Xiang; WANG An-He; ZHOU Hong-Wei; ZUO Xiang-Qing   

  1. College of Physics and Electronics; College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Ji′nan 250014, P. R. China
  • Received:2005-08-10 Revised:2005-10-17 Published:2006-03-10
  • Contact: LI Huai-Xiang E-mail:huaixiangli@yahoo.com

摘要: 以Zn(NO3)2•6H2O和AlCl3•6H2O为原料, 借助CO(NH2)2的水解反应, 采用化学均相共沉淀方法和热处理工艺, 在自制CaSiO3∶Pb, Mn红色荧光粉表面包覆ZnO∶Al, 形成透明导电层. 运用数字万用表和自制测量盒对粉体的电阻率进行测量, 比较了包覆率n(Zn)/n(Ca)、n(Al)/n(Zn), 热处理温度和热处理时间对粉体电阻率的影响; 优化出包覆条件和热处理条件: n(Zn)/n(Ca)=10%, n(Al)/n(Zn)=5%, 75 ℃水解1.5 h, 500 ℃热处理45 min. 对包覆样品进行了室温光致荧光(PL)测量, X射线衍射(XRD)结构分析和透射电子显微镜(TEM)形貌观察. 结果显示, 当n(Zn)/n(Ca)=10%时, 在CaSiO3∶Pb, Mn荧光粉表面形成了连续的ZnO∶Al敷膜, 荧光粉的电阻率明显降低, 并且保持了良好的光致发光性质.

关键词: 均相共沉淀法, 表面包覆, 光致发光, 荧光粉, 氧化锌

Abstract: CaSiO3∶Pb, Mn phosphor particles with red-luminescence were prepared by aqueous co-deposition reaction. Surface modification of CaSiO3∶Pb, Mn phosphors was carried out by coating transparent conductive films of Al-doped zinc oxide which were formed by homogeneous phase co-precipitation and heat treatment process. The coated phosphors were characterized by X-ray diffraction (XRD), photoluminescence (PL), transmittance electron microscopy (TEM) and conductance measurements. The results showed that the conductivity of ZnO∶Al-coated phosphors, n(Zn)/n(Ca)=10%, n(Al)/n(Zn)=5%, had been improved obviously while the corresponding photoluminescence intensity remained the same as the as-prepared phosphors. For lowering the resistivity of phosphors, experimental conditions have been optimized, which include hydrolyzing at 75 ℃ for 1.5 h, heat treatment at 500 ℃ for 45 min, respectively.

Key words: Homogeneous phase co-precipitation, Surface modification, Photoluminescence, Phosphor, Zinc oxide