Patent ID: 7084426

Claim:
An organic electroluminescent device comprising a plurality of organic light-emitting elements each having a laminate in which an organic light-emitting layer is interposed between an anode and a cathode, wherein the organic light-emitting layer is made of a high-molecular-weight light-emitting material, the plurality of organic light-emitting elements include a first organic light-emitting element having a first organic light-emitting material which has a first lowest unoccupied molecular orbital (LUMO) level, and a second organic light-emitting element having a second organic light-emitting material which has a second LUMO level, the first LUMO level is a highest LUMO level among organic light-emitting materials constituting the plurality of organic light-emitting elements, the second LUMO level being a lowest LUMO level among the organic light-emitting materials constituting the plurality of organic light-emitting elements, and the cathode is formed common to the first organic light-emitting element and the second organic light-emitting element, and the cathode has a first layer and a second layer, the first layer being made of a fluoride or oxide of an alkali metallic material, a fluoride or oxide of an alkali earth metallic material, or a complex or compound of an organic material, and the second layer containing atoms whose work functions are different from the first LUMO level by less than 0.7 eV, and the first layer and the second layer being sequentially deposited on the organic light-emitting layer.