Patent ID: 8920940

Claim:
A light-emitting element comprising: a hole injecting layer, a hole transporting layer, a light-emitting layer, an electron transporting layer, an electron injecting layer, and a second electrode which are stacked sequentially over a first electrode; wherein the light-emitting layer comprises a host material and an organometallic complex having a structure represented by a general formula (6), wherein the hole injecting layer comprises a mixture of a molybdenum oxide and an aromatic amine based compound, wherein the electron injecting layer comprises an organic compound and a substance showing an electron donating property to the organic compound, wherein the host material has a triplet excitation energy higher than the organometallic complex, wherein the substance showing an electron donating property to the organic compound is lithium, and wherein R 1 is a methyl group; R 2 to R 5 is selected from the group consisting of hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, and a heterocyclic group; R 6 to R 9 is hydrogen or a halogen element; at least one of R 6 to R 9 represents a fluorine atom; M is iridium; n=2; and L is a monoanionic ligand.