Patent ID: 8174001
Filing Date: 2012-05-08
Classification: H01L

Abstract:
1. An organic electroluminescence element comprising at least two light-emitting layers disposed between an anode and a cathode, wherein the at least two light-emitting layers include: (1) a light-emitting layer A that contains an electron transporting light-emitting material and a hole transporting host material, wherein a concentration of the electron transporting light-emitting material gradually increases on the whole from an anode side toward a cathode side of the light-emitting layer A; and (2) a light-emitting layer B that contains a hole transporting light-emitting material and an electron transporting host material, wherein a concentration of the hole transporting light-emitting material gradually decreases on the whole from an anode side toward a cathode side of the light-emitting layer B, wherein the light-emitting layer A is disposed closer to the anode than the light-emitting layer B, and the light-emitting layer B is disposed closer to the cathode than the light-emitting layer A.