A mixture of polysiloxane (PSO) and polysilazane (PSZ) was used to prepare a crosslinked organosilicon material for use as an LED encapsulant. The crosslinking was conducted by using two different chemistries: platinum-catalyzed hydrosilylation and peroxide- initiated radical reaction. Successful crosslinking was confirmed by FT-IR spectroscopy, which showed decreased intensities of vinyl (3,100 cm^-1) and hydrosilane (2,140 cm^-1) peaks. The prepared films showed high transparency (>90% at 400 nm) because of the high compatibility between PSO and PSZ. The crosslinked organosilicon films showed higher hardness values when both PSO and PSZ were used at the same time, indicating higher crosslinking density.