Patent ID: 8415687

Claim:
An organic light-emitting device, comprising: a substrate; a first electrode arranged on the substrate; a second electrode arranged to face the first electrode; an organic light-emitting layer arranged between the first electrode and the second electrode; and an electron transport layer arranged between the organic light-emitting layer and the second electrode, wherein the electron transport layer comprises a multi-layer structure comprising at least one of first layers and at least two of second layers, wherein ones of said at least one of first layers and ones of said at least two of second layers are alternately and sequentially stacked; ones of the at least two of second layers are arranged at both opposite ends of the electron transport layer; each of the at least two of second layers has a lower electron mobility than that of each of the at least one of first layers; and each of the first layers and the second layers is embodied as the electron transport layer.