Patent ID: 8389979
Filing Date: 2013-03-05
Classification: H01L

Abstract:
1. A light-emitting element comprising: an EL layer between an anode and a cathode; a first layer including a substance having a hole-transport property and an acceptor substance being in contact with the cathode and between the cathode and the EL layer; a second layer including a first donor substance and a first substance having an electron-transport property and being in contact with the first layer and between the cathode and the EL layer; and a third layer including a second donor substance and a second substance having an electron-transport property and being in contact with the second layer and with the EL layer and between the cathode and the EL layer, wherein a LUMO level of the first substance having an electron-transport property is lower than a LUMO level of the second substance having an electron-transport property.