A low refractive index composition that forms a low refractive index layer
on an optical display is formed having a co-crosslinked interpenetrating
polymer network of a fluoropolymer phase and an acrylate phase. The
fluoropolymer phase is preferably formed from fluoropolymers based on THV
or FKM and having either a degree of unsaturation and/or containing a
reactive cure site monomer in its polymer backbone. The acrylate phase
includes a multifunctional acrylate crosslinker, and more preferably
includes a perfluoropolyether acrylate crosslinker. The formed low
refractive index layer has improved interfacial adhesion to other layers
or substrates contained in the optical display. Further, the mechanical
strength and scratch resistance of the either of above low refractive
index compositions can be further enhanced through the incorporation of
surface functionalized inorganic particle into the formed layer.