High refractive index (Rl) materials, especially radiation-curable high Rl materials, have been used in a wide variety of optical, photonic and electronic applications. Recently, there are fast-growing demands for new materials which offer even higher Rl, higher performance, and especially, are halogen-free because of the increasing environmental concerns. Achieving equivalent Rl without the use of halogenated materials, however, has been a major hurdle up until now. A unique, inorganic-organic hybrid nanocomposite technology platform has been developed which significantly improves nanoparticle compatibility with acrylated resins, and most important, minimizes viscosity increase. Unlike many nanoparticle dispersions which show various degrees of haziness because of particle agglomerations, this inorganic-organic hybrid nanocomposite technology demonstrates excellent optical transparency. Technical results from the newly developed high Rl technologies, along with existing technologies for comparison purpose, will be discussed in this paper.
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