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A novel Ir complex, (BuPhNPPy)2Ir(acac) with arylamine unit, was synthesized. A peak external quantum efficiency of 10.4% photons per electron at current density of 32 mA/cm2 and a maximum luminance of 14610 cd/m2 at drive voltage of 24 V were achieved in a single-layered polymer light-emitting device using this Ir complex as dopant with 4% dopant concentration and a blend of poly(vinylcarbazole) as host matrix. The highly efficient electrophosphorescence of the Ir complex was exhibited with green emission at 533 nm.