To further balance the of injection hole and electron carriers in the organic li ght-emitting diode (OLED),the OLED device with the structure of ITO/NPB(40nm)/Alq₃(45nm)/Bphen:(X%)BCP: (5%)Cs₂CO₃(15nm)/Cs₂CO₃(1.5nm)/Al(100nm) is prepared.The effect of Bphen:BCP:Cs₂CO_3as electron transport layer on the l uminescence brightness,current density and current efficiency O LED devices of is studied by changing the doping concentration of BCP.Results show that Bphen:BCP:Cs₂CO_3used as electron transport layer can improve the electron injection and the performance of devices.Compared with the device without BCP,Bphen:(10%)BCP:Cs₂CO_3as electron transport layer can increase the maximum current efficiency by 46% and reach 3.89cd/A.The Commission International de l′Eclaiage CIE chromaticity coordinate keeps (0.35,0.55) as the voltage increases from 5V to 10V,and it has high stab ility.Because the high lowest unocoupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels of BCP ca n effectively block the hole to reach the cathode and reduce hole leakage current,and at the same time,the electron injection is easier. So the injection of electrons and holes becomes more balanced,and the luminescence is also more stable.