Patent ID: 8053980

Claim:
A light-emitting device comprising: a first light-emitting element, a second light-emitting element, and a third light-emitting element which emit light having different color from each other; the first light-emitting element comprising: a first anode; a first cathode; and a first light-emitting layer and a second light-emitting layer between the first anode and the first cathode, wherein the first light-emitting layer includes a first light-emitting substance and a first organic compound, and the second light-emitting layer includes the first light-emitting substance and a second organic compound, wherein the first light-emitting layer is in contact with the first anode side of the second light-emitting layer, and wherein the first organic compound is an organic compound having a hole-transporting property and the second organic compound is an organic compound having an electron-transporting property, the second light-emitting element comprising: a second anode; a second cathode; and a third light-emitting layer and a layer for controlling carrier transfer between the second anode and the second cathode, wherein the third light-emitting layer includes a second light-emitting substance, wherein the layer for controlling carrier transfer includes a third organic compound and a fourth organic compound, and is provided between the third light-emitting layer and the second cathode, wherein the third organic compound is an organic compound having an electron-transporting property and the fourth organic compound is an organic compound having an electron-trapping property; wherein the third organic compound is included more than the fourth organic compound in the layer for controlling carrier transfer, and wherein the layer for controlling carrier transfer is in direct contact with the third light-emitting layer, the third light-emitting element comprising: a third anode; a third cathode; and a fourth light-emitting layer, wherein the fourth light-emitting layer includes a fifth organic compound, a sixth organic compound, and a third light-emitting substance, wherein the fifth organic compound is an organic compound having a hole-transporting property, and the sixth organic compound is an organic compound having an electron-transporting property, and wherein the third light-emitting substance is a substance which emits phosphorescence.