Patent ID: 8129897

Claim:
An organic electroluminescence element comprising at least a light-emitting layer disposed between a pair of electrodes, wherein the light-emitting layer comprises at least two electron transporting materials and a hole transporting host material, with at least one of the electron transporting materials being an electron transporting light-emitting material, each of the at least two electron transporting materials is present over the entire region of the light-emitting layer, and a concentration of each of the at least two electron transporting materials in the light-emitting layer decreases from a cathode side toward an anode side; and wherein the total concentration of the at least two electron transporting materials is 20% by weight or less in an interface region of the light-emitting layer on the anode side and the total concentration of the at least two electron transporting materials is 80% by weight or more in an interface region of the light-emitting layer on the cathode side.