Patent ID: 8486543

Claim:
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 and an electron-accepting compound, wherein the second layer comprises a second organic compound having a HOMO level differing from a HOMO level of the first organic compound by greater than or equal to −0.2 eV and less than or equal to +0.2 eV, and wherein the light-emitting layer comprises a third organic compound having a HOMO level differing from the HOMO level of the second organic compound by greater than or equal to −0.2 eV and less than or equal to +0.2 eV and a light-emitting substance having a hole-trapping property with respect to the third organic compound.