Patent ID: 9698354
Date: 2017-07-04
CPC Classifications: C09K,H01L

Claim:
1. A light-emitting element comprising: between an anode and a cathode, at least a stack structure including a first layer, a second layer, and a light-emitting layer, wherein the first layer is between the anode and the second layer, the second layer is between the first layer and the light-emitting layer, and the light-emitting layer is between the second layer and the cathode, wherein the first layer comprises a first organic compound having a first hole-transport skeleton and an electron-accepting compound, wherein the second layer comprises a second organic compound having a second hole-transport skeleton, wherein the light-emitting layer comprises a third organic compound having a third hole-transport skeleton and a light-emitting substance having a hole-trapping property with respect to the third organic compound, wherein the second organic compound and the third organic compound are the same, and wherein the first hole-transport skeleton and the second hole-transport skeleton each separately comprise a skeleton of at least any one of a π excessive heteroaromatic ring, a tricyclic condensed aromatic hydrocarbon ring, and a tetracyclic condensed aromatic hydrocarbon ring.