Antireflective UV blocking multilayer coatings wherin film has cerium oxide

摘要

The present invention provides antireflective multilayer coatings comprising thin film optical coatings and methods of making such coatings. The thin film optical coating includes sol-gel derived cerium oxide, silicon dioxide, and oxides of one or more transition metals selected from group IIIB to VIB of the periodic table that can provide a refractive index of about 1.90 or greater. The thin film may optionally contain colloidal gold particles. The present invention relates to a process for preparing a cerium oxide nanoparticle comprising impregnating a substrate with a solution comprising cerium nitrate hexahydrate, an alcohol and a chelating agent, removing the substrate from the solution and heat treating the coated substrate to form a metal oxide, Silicon dioxide, and a layer of an oxide of at least one transition metal selected from Group IIIB to Group VIB of the periodic table.