The white organic light emitting device for improved efficiencies includes an anode and a cathode opposing each other on a substrate, a charge generation layer between the anode and the cathode, a first stack and a second stack interposed between the anode and the charge generation layer, and between the charge generation layer and the cathode, respectively, wherein at least one of a first hole transport layer and a second hole transport layer has a triplet energy level higher than a triplet energy level of the light emitting layer adjacent thereto, and a difference between a triplet energy level and a singlet energy level of 0.01 eV to 0.6 eV.