▎ 摘　　要

Highly efficient organic light-emitting diodes are fabricated with a novel electron injection layer consisting of Cs2CO3: graphene. The structure of devices is ITO/N, N'-bis-(1-naphthyl)-N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) (50 nm)/tris-(8-hydroxy quinoline)-aluminum (Alq(3)) (80 nm)/Cs2CO3: graphene (20 wt.% 1 nm)/Al(120 nm). Compared with the standard devices consisting of ITO/NPB(50 nm)/Alq(3)(80 nm)/LiF(0.5 nm)/Al(120 nm), the maximum current efficiency of the Cs2CO3: graphene-based device was 2.02 cd/A at 9.5 V, which was 2.59 times higher than that of LiF-based device, the maximum luminance of the Cs2CO3: graphene-based device was 7690 cd/m(2) at 12 V, which was 2.07 times higher than that of LiF-based device. The results showed that the performance of the devices with an electron injection layer of Cs2CO3: graphene were significantly improved due to enhancing the electron injection capacity.