| 摘要 |
<p>An organic electroluminescent element comprising a cathode, an anode, an intermediate unit arranged between a cathode and an anode, a first light emitting unit arranged between a cathode and an intermediate unit, and a second light emitting unit arranged between an anode and an intermediate unit, wherein an electron extracting layer for extracting an electron from an adjacent layer adjoining a cathode side is provided in an intermediate unit, an absolute value of an energy level of a lowest unoccupied molecular orbital (LUMO) of an electron extracting layer |LUMO(A)|, and an absolute value of an energy level of a highest occupied molecular orbital (HOMO) of the adjacent layer |HOMO(B)| are in the relationship of |HOMO(B)|-|LUMO(A)|<=1.5 eV, and an intermediate unit supplies a hole generated by extraction of an electron from an adjacent layer by an electron extracting layer and, at the same time, supplies the extracted electron to a second light emitting unit.</p> |
