Patent ID: 9048439
Filing Date: 2015-06-02
Classification: H01L,Y10S

Abstract:
1. A light-emitting element comprising: n EL layers between an anode and a cathode, n being a natural number greater than or equal to 2; and a first layer, a second layer, and a third layer between an m-th EL layer from the anode and an (m+1)th EL layer, m being a natural number greater than or equal to 1 and lesser than or equal to (n−1), wherein the first layer is provided between the (m+1)th EL layer and the second layer, is in contact with the (m+1)th EL layer and the second layer, and contains an organic compound and an acceptor substance, wherein the second layer is provided between the first layer and the third layer, is in contact with the first layer and the third layer, and consists essentially of a metal complex having a metal-oxygen bond and an aromatic ligand, wherein the third layer is provided between the second layer and the m-th EL layer, is in contact with the second layer and the m-th EL layer, and contains an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, or a rare earth metal compound, and wherein a LUMO level of the metal complex is greater than or equal to −5.0 eV and less than or equal to −3.0 eV.