Patent ID: 8664849

Claim:
A light-emitting element comprising: an anode and a cathode over a substrate; and a first layer, a second layer and a third layer between the anode and the cathode, wherein the first layer is between the anode and the second layer, wherein the third layer is between the second layer and the cathode, wherein the first layer is a mixture including a first organic compound having a hole-transporting property and a second organic compound having a light-emitting property, wherein the second layer is a mixture including a third organic compound having a hole-transporting property and a fourth organic compound having a light-emitting property, wherein the third layer is a mixture including a fifth organic compound having an electron-transporting property and the second organic compound, wherein the fourth organic compound is a different compound from the second organic compound, wherein a color of light emitted from the second organic compound and a color of light emitted from the fourth organic compound have a relationship of complementary colors, and wherein the color of light emitted from the second organic compound is blue, and the color of light emitted from the fourth organic compound is yellow.