CeO2-TiO2/SiO2 Anti-Reflecting and UV-Shielding Double-Functional Films Coated on Glass Substrates Using Sol-Gel Method

CeO2-TiO2/SiO2 double-layered films were coated on glass substrates using sol-gel method. The films, formed using spin-coating process, had two optical properties at the same time, anti-reflection in visible region and ultraviolet rays (UV) shielding. The films could be used as museum windows, commercial high-resolution displays and so on. These films were composed of CeO2 and TiO2 with molar ratio of 50 to 50 in the first layer and silica matrix in the 2nd layer. Furthermore, the 2nd layer was composed of porous silica films, which showed a lower refractive index, reducing the reflectance significantly in visible wavelength region. The reflectance of the films in visible region between 400 × 700 nm was lower than 2%, and almost 100% UV was shielded. The surface roughness of the films was observed through an atomic force microscope, a depth composition profile of the double layered film was measured with an X-ray photoelectron spectrometer (XPS).