Patent ID: 7768195

Claim:
An organic electroluminescent device comprising: an anode, a first emitting layer, a carrier barrier layer, a second emitting layer, and a cathode stacked in that order; the first emitting layer being formed of a hole transporting material, and the second emitting layer being formed of an electron transporting material; the affinity level of the carrier barrier layer being smaller than the affinity level of the second emitting layer in an amount of 0.2 eV or more; and the ionization potential (Ie 1 ) of the carrier barrier layer and the ionization potential (Ih 1 ) of the first emitting layer satisfying Ie 1 <Ih 1 +0.1 (eV) (1), wherein the energy gap of the first emitting layer is from 1.8 to 2.8 eV and the energy gap of the second emitting layer is from 2.2 to 3.3 eV.