Patent ID: 8853680

Claim:
A light-emitting element comprising: a first electrode; a hole-injection layer over the first electrode; a first layer over the hole-injection layer, the first layer containing a first organic compound which has a hole-transport property; a light-emitting layer over the first layer, the light-emitting layer containing a phosphorescent compound, the first organic compound, and a second organic compound which has an electron-transport property; a second layer over the light-emitting layer, the second layer containing the second organic compound; an electron-injection layer over the second layer; and a second electrode over the electron-injection layer, wherein the first organic compound and the second organic compound are selected so that an exciplex is formed therebetween, and wherein the phosphorescent compound is an organometallic complex whose absorption originating from a triplet metal-to-ligand charge transfer transition overlaps with an emission of the exciplex.