Organic light-emitting device comprising buffer layer and method for fabricating the same

Disclosed herein are an organic light-emitting device having a structure formed by the sequential deposition of a substrate, a first electrode, at least two organic layers and a second electrode, in which the organic layers include a light-emitting layer, and one of the organic layers, which is in contact with the second electrode, is a buffer layer comprising a compound of formula 1, as well as a fabrication method thereof. The buffer layer makes it possible to minimize or prevent damage to the organic layer, which can occur when forming the second electrode on the organic layer.