In this research, we develop a nearly white light emitting device by integrating blue/green emission from a GaN based light emitting diode (LED) with red emission from a porous SiO2 layer. The porous SiO2 layer was fabricated by a novel process procedure to create Si nanocrystals on top of the n-type GaN layer. Red light is generated from the metal-oxide-semiconductor (Ni/Au–SiO2 oxide-n-type GaN) structure due to the electron-hole recombination in the Si nanocrystals. The device shows a blue light emission at a low biased voltage and nearly white light emission (green and red colors) at a bias voltage between 14V and 16V. Our results show the potential of applying such an integrated structure to white light illumination.