Patent ID: 8274214

Claim:
A light emitting element comprising: a first layer; a second layer; a third layer; and a fourth layer which are sequentially provided on an anode side between an anode and a cathode, wherein the first layer includes a first phosphorescent compound and a first organic compound that has a hole transporting property, wherein the second layer includes a first fluorescent organic compound and a second organic compound that has a hole transporting property, wherein the third layer includes a second fluorescent organic compound and a first organic compound that has an electron transporting property, and wherein the fourth layer includes a second phosphorescent compound and a second organic compound having an electron transporting property, wherein triplet excitation energy of the second organic compound having a hole transporting property is higher than or equal to triplet excitation energy of the first organic compound having a hole transporting property, and wherein triplet excitation energy of the first organic compound having an electron transporting property is higher than or equal to triplet excitation energy of the second organic compound having an electron transporting property.