Two color white organic light-emitting diode (WOLED) that uses a co-host system in a solution process method was achieved. The device configuration was ITO/PEDOT:PSS (40nm)/emitting layer (50nm) / BCP (10nm) / Alq3 (20nm) / LiF (1nm) / Al. The emitting layer consists of two co-hosts of TATa and NPB and dopants of DPAVBi (blue) and rubrene (yellow). As the ratio of the host material NPB was increased, the operating voltage of the device was reduced. Luminance efficiency and power efficiency were also increased according to the NPB ratio. For the white device using host of TATa 40%:NPB 60%, the efficiency was 5.17 cd/A and 3.23 lm/W with color coordinates of (0.29, 0.38).