Highly efficient organic light-emitting diodes (OLEDs) are fabricated with a n ovel efficient electron injection layer consisting of Cs₂CO₃:graphene.The structu re of devices is ITO/N,N′-bis-(1-naphthyl)-N, N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) (50nm)/tris-(8-hydroxy quinoline)-aluminum Alq₃(80nm)/Cs₂CO₃:Graphene (20wt.% 1nm)/Al(120nm).The test results are compared with the standard device consisting of ITO/NPB(50nm)/Alq₃(80nm)/LiF(0.5nm)/Al(120nm),and the effect of Cs₂CO₃:graphene as electron injection layer on the OLEDs properties is stud ied. The results show that the efficiency of the device based on Cs₂CO₃:graphene as an efficient electron injection layer is higher than that based on L iF as electron injection layer.The maximum current efficiency of the device reaches 2.02cd/A at 9.5V, which is 2.59times of that of standard device;the maximum luminance of this device reaches 7690cd/m^2at 12V,which is 2.07times of that of standard device.The per formance of device with an electron injection layer consisting of Cs₂CO₃:gra phene is improved,and the main reason is that it can enhance the electron electr on injection.