Further, the hole transport layer of the organic light emitting device is a layer that is disposed on the anode or the hole injection layer, and receives holes from the hole injection layer and transports the holes to the light emitting layer.

The hole transport layer is composed of a hole transport material, and the hole transport material is suitably a material having large mobility to the holes, which may receive holes from the anode or the hole injection layer to transfer the holes to the light emitting layer. Specific examples thereof include an arylamine-based organic material, a conductive polymer, a block copolymer in which a conjugate portion and a non-conjugate portion are present together, etc., but are not limited thereto.

Further, the organic light emitting device may further include an electron blocking layer between the hole transport layer and the light emitting layer. Preferably, the electron blocking layer is disposed in contact with the light emitting layer, and prevents excess electron transfer to increase probability of hole-electron recombination, thereby improving efficiency of the organic light emitting device. The electron blocking layer includes an electron blocking material. The electron blocking material may include arylamine-based organic materials, but is not limited thereto.

Further, the light emitting layer of the organic light emitting device is a layer that emits light in the visible light region by combining holes and electrons, each transported from the hole transport layer and the electron transport layer. The light emitting layer preferably includes a material having high quantum efficiency for fluorescence or phosphorescence. Specifically, the light emitting layer may include a host material and a dopant material.