Effect of SPFGraphene dopant in MEH–PPV organic light-emitting devices

In this paper, graphene acts as the acceptor material in the luminous layer. The doping behavior of graphene in MEH–PPV has improved the device performance due to the efficient electron injection and transport through highly conductive graphene. When the graphene content is 0.02 wt%, the highest EL brightness reaches 1960 cd/m2 and the threshold voltage declines from 8 V to 5 V. When the graphene content is 0.02 wt%, the device has the highest EL brightness compared with the devices of other graphene content at the same current density. The doping graphene into MEH–PPV results in the best luminous efficiency and balanced electron and hole mobilities in the active layer.