Patent ID: 9012034
Filing Date: 2015-04-21
Classification: C09K,H01L,H05B

Abstract:
1. An organic electroluminescence element comprising at least a light-emitting layer interposed between a pair of electrodes, wherein: 1) the light-emitting layer is divided into at least three layers in a thickness direction thereof, wherein each of the divided light-emitting layers independently contains a light-emitting material and a host material, and at least two intermediate layers each containing an electron blocking material and wherein the at least two intermediate layers are respectively disposed between and connect the divided light-emitting layers; wherein a first intermediate layer is closer to an anode and a second intermediate layer is closer to a cathode; 2) an Ea (electron affinity) value of the electron blocking material contained in the first intermediate layer is smaller than an Ea value of the host material contained in the divided light-emitting layer adjacent on a cathode side of the first intermediate layer; and 3) a difference ΔEa