The application provides an organic light emitting device, a method of fabricating the organic light emitting device, and a display device. The organic light emitting device comprises an anode layer, a cathode layer, and a light emitting layer provided between the anode layer and the cathode layer, and further comprises a carrier velocity adjustment layer provided between the light emitting layer and at least one of the anode layer and the cathode layer, and the carrier velocity adjustment layer is used for adjusting an injection rate of a carrier.