SOL-GEL BASED ANTIREFLECTIVE COATINGS USING PARTICLE-BINDER APPROACH WITH HIGH DURABILITY, MOISTURE RESISTANCE, CLOSED PORE STRUCTURE AND CONTROLLABLE PORE SIZE

摘要

Durable porous low refractive index coatings, methods and compositions for forming the porous low refractive index coatings are provided. The method comprises coating a substrate with a sol formulation comprising a silane-based binder having one or more reactive groups and silica based nanoparticles and annealing the coated substrate. The silane-based binder comprises from about 30 wt. % to about 70 wt. % ash contribution in the total ash content of the sol formulation. Porous coatings formed according to the embodiments described herein demonstrate good optical properties (e.g., a low refractive index) while maintaining good mechanical durability due to the presence of a high amount of binder and a closed pore structure.