Patent ID: 9543538
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. An organic light-emitting device comprising: a positive electrode; a negative electrode; and at least one organic material layer between the positive electrode and the negative electrode, wherein the at least one organic material layer comprises a hole-injecting layer, a hole-transporting layer, an emission layer comprising a host material and a dopant material, an electron-transporting layer, an electron-injecting layer, and a lifetime enhancement layer between the emission layer and the electron-transporting layer, the lifetime enhancement layer comprising a bipolar compound comprising an electron withdrawing group (EWG) and an electron donating group (EDG), the bipolar compound having an ionization potential of 5.5 eV or greater, a difference between an energy of the highest occupied molecular orbital and an energy of the lowest occupied molecular orbital of greater than 3.0 eV, a triplet energy of 2.3 eV or greater, and a difference between a singlet energy and the triplet energy of less than 0.5 eV, wherein the bipolar compound is a compound represented by Formula 1: where X Y X R a C