摘要
以Zn(NO3)·26H2O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1.5h,500℃热处理45min.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.
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 rain, respectively.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第3期286-290,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(60071006)
山东省自然科学基金(Y2002G11)资助项目
关键词
均相共沉淀法
表面包覆
光致发光
荧光粉
氧化锌
Homogeneous phase co-precipitation, Surface modification, Photoluminescence, Phosphor, Zinc oxide
