A novel high refractive index and highly transparent silicone resin-type material for the packaging of high-power light-emitting diodes (LEDs) is introduced, which was synthesized by hydrosilylation of vinyl end-capped methylphenyl silicone resin and methylphenyl hydrosilicone oil catalyzed by Karstedt's catalyst. The vinyl end-capped methylphenyl silicone resins were prepared by hydrolysis−polycondensation method from methylphenyl diethoxysilane (MePhSi(OEt)2), phenyl triethoxysilane (PhSi(OEt)3), and vinyl dimethylethoxy silane (Me2ViSiOEt) in toluene/water mixture catalyzed by cation-exchange resin. The vinyl end-capped methylphenyl silicone resins were characterized by 1H-NMR and Fourier-transform infrared. The performances of the cured silicone resin-type materials for LED packaging have been examined in detail. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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