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We investigate the electron injection mechanism of the effective cathode structure,doping cesium carbonate (Cs2CO3) into the organic electron-transport layer,which significantly enhances the electron injection in comparison with an ultra-thin Cs2CO3 injection layer,with a notable superiority in both luminance and efficiency.The results show Cs2CO3 doped tris-(8-hydroxyquinoline) aluminum(Alq3)/Al cathode exhibited better electron injection than Cs2CO3/Al bilayer cathode,thus a maximum current efficiency of 6.5 cd/A (3.1 cd/A for Cs2CO3/Al) is obtained for 30 wt% Cs2CO3 doping concentration device.It is proposed that this improved efficiency is related to the greatly enhanced electron injection at the Alq3∶Cs2CO3/Al cathode interface and efficient electron transport in the bulk of the Cs2CO3∶Alq3 layer.