Patent ID: 8686403

Claim:
An organic light emitting device comprising a first electrode, two or more organic compound layers, and a second electrode, wherein the first electrode comprises a conductive layer and an n-type organic compound layer which is in contact with the conductive layer, one of the organic compound layers interposed between the n-type organic compound layer of the first electrode and the second electrode is a p-type organic compound layer forming an NP junction together with the n-type organic compound layer of the first electrode, energy levels of the layers satisfy the following Expressions (1) and (2), and one or more layers interposed between the p-type organic compound layer and the second electrode are n-doped with Ca or Mg: 0 eV< E nL âˆ’E F1 â‰¦4 eVâ€ƒâ€ƒ(1) E pH âˆ’E nL â‰¦1 eVâ€ƒâ€ƒ(2) where E F1 is a Fermi energy level of the conductive layer of the first electrode, E nL is an LUMO (lowest unoccupied molecular orbital) energy level of the n-type organic compound layer of the first electrode, and E pH is an HOMO (highest occupied molecular orbital) energy level of the p-type organic compound layer forming the NP junction together with the n-type organic compound layer of the first electrode, and wherein the Ca or Mg in the organic compound layer n-doped with Ca or Mg is 0.02 to 30 volume %.