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