Patent ID: 9172055
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. An organic light-emitting device, comprising: a substrate; a first electrode on the substrate; a second electrode opposing the first electrode; an emission layer between the first electrode and the second electrode; a first hole transport layer between the emission layer and the first electrode, the first hole transport layer including a first hole transport compound and a first electron acceptor; a second hole transport layer between the emission layer and first hole transport layer, the second hole transport layer including a second hole transport compound; a third hole transport layer between the emission layer and the second hole transport layer, the third hole transport layer including a third hole transport compound and a second electron acceptor; a fourth hole transport layer between the emission layer and the third hole transport layer, the fourth hole transport layer including a fourth hole transport compound; a buffer layer between the emission layer and the fourth hole transport layer; and an electron transport layer between the emission layer and the second electrode, the electron transport layer including a pyrimidine-based compound, wherein the first hole transport compound and the third hole transport compound each independently include a compound represented by Formula 1, and the second hole transport compound and the fourth hole transport compound each independently include a compound represented by Formula 2: wherein, in Formula 1, Ar e and f are each independently an integer from 0 to 5; R R wherein, in Formula 2, Ar a and b are each independently an integer from 0 to 5; c is an integer from 1 to 5; R d is an integer from 0 to 5; R wherein, R the nitrogen atom-containing group is a ring group with at least one nitrogen as a ring atom selected from among a 5-membered aromatic ring group, a 6-membered aromatic ring group, and a 9-membered aromatic ring group fused from 5-membered and 6-membered aromatic groups.