Enhanced performance in organic light-emitting diode by utilizing MoO3-doped C60 as effective hole injection layer

► MoO3-doped C60 is used as an efficient hole injection layer for OLED. ► Driving voltage is significantly reduced and luminance is greatly enhanced. ► Power efficiency is increased by more than 40% at 10 and 100 mA/cm2, respectively. ► The enhancement is ascribed to charge transfer complex formed between MoO3 and C60.