As to the crisis of energy in the recent years, devices manufacturing industry must be go toward the optimizing of energy consumption and increment in the lifetime leading to reduce production cost. Organic light emitting diodes (OLED) are one of the modern generations in the lighting industry that have many advantages such as being light and thin, flexibility, ability to be transparent, and easy to fabricate. These devices consist of hole injecting layer/electron and emissive layer. The main role of hole/electron injection layers is injection of charge carriers to emissive layer where electrons and holes recombinate and create photons. In this work we focused on optimization of hole injection in order to increase lifetime of device. We used the different composition of molybdenum oxide (MoOx) and graphene oxide (GO) in hole injection layer. The maximum efficiency of the devices owned to the composite thin film with 1:1 value ratio (MoOx:GO) that it could be reached to 7.5 lm/W.  The lifetime of the optimization of composite was compared to the standard device fabricated with PEDOT:PSS so that the results showed a 30 times enhancement in lifetime.