Organic-inorganic hybrid films are fabricated by applying a sol-gel method using perhydropolysilazane (PHPS), which are then applied on the active layers of quadruple-layer structure organic light-emitting diodes (OLEDs). All organic layers are fabricated using wet-process. In the quadruple-layer OLEDs consisting of the active layer without the sol-gel reaction, electroluminescence (EL) emissions from the active layer is not observed. This is because the electron-transporting layer and the adjacent active layer are mixed. However, if the sol-gel reaction is performed the EL emissions from the active layer are clearly observed. This is because the active layer is not destroyed due to its insolubility.