| 摘要 |
<p>Disclosed is 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 alkali earth metal: 0 eV < E nL - E Fl ‰¤ 4 eV E pH - E nL ‰¤ 1 eV
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.</p> |
