Preparation and performance of high refractive index silicone resin-type materials for the packaging of light-emitting diodes

摘要

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 (Me 2ViSiOEt) 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.