Patent ID: 9548468
Date: 2017-01-17
CPC Classifications: G09G,H01L

Claim:
1. A light-emitting element comprising: a first electrode; a second electrode; and an EL layer between the first electrode and the second electrode, wherein the EL layer comprises a first light-emitting layer and a second light-emitting layer, wherein the first light-emitting layer comprises a fluorescent material and a host material, wherein the second light-emitting layer comprises a phosphorescent material, a first organic compound, and a second organic compound, wherein an emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region, wherein the first organic compound and the second organic compound form an exciplex, wherein energy is transferred from the exciplex to the phosphorescent material, and wherein a triplet excited level of the host material is lower than triplet excited levels of the first organic compound and the second organic compound.