Low refractive index diffuser element having interconnected voids

Abstract

An optical diffuser layer includes a binder, a plurality of metal oxide particles dispersed in the binder, and a plurality of interconnected voids. A plurality of haze generating particles are dispersed in the binder. The optical diffuser layer has an effective refractive index of 1.3 or less.

Description

Background technique [0001] Articles with nanoscale pore or void structures are useful in a variety of applications based on the optical, physical or mechanical properties provided by their nanovoided compositions. For example, a nanovoided article comprises a polymeric solid network or matrix at least partially surrounding pores or voids. The pores or voids are usually filled with a gas such as air. The size of the pores or voids in a nanovoided article can generally be described as having an average effective diameter that can range from about 1 nanometer to about 1000 nanometers. The International Union of Pure and Applied Chemistry (IUPAC) has defined three size categories of nanoporous materials: micropores with voids smaller than 2 nm, mesopores with voids between 2 nm and 50 nm, and voids larger than 50nm macropores. Each of the above different sizes can provide unique properties to the nanovoided article. [0002] Several techniques have been used to create porous ...

AI Technical Summary

Problems solved by technology

Washing steps can limit the size range and uniformity of the resulting pores or voids

These techniques are also limited by the type of materials available

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