The near-infrared (NIR) organic light-emitting diodes (OLEDs) with the structure of ITO/NPB/TPBI:(4-tert)CuPc/BCP/Alq3/Al are fabricated by vacuum thermal evaporation.The emission peak is about 1 110 nm at room temperature.The emissions are from the first excited triplet state to the ground state of (4-tert)CuPc.The optimal doping concentration of (4-tert)CuPc in TPBI is 14 wt%.The devices with the structure of ITO/NPB/TPBI:(4-tert)CuPc/DCJTB/BCP/Alq3/Al are also fabricated.The results indicate that the ins...