| 摘要 |
<p>An organic EL element (1) is formed by laminating two emitting layers (5, 7) between an anode (3) and a cathode (9) with a hole transporting non-emitting layer (6) being interposed between the two emitting layers (5, 7). The emitting layer (5) on an anode side is a hole transporting emitting layer, the emitting layer (7) on a cathode side is an electron transporting emitting layer. The non-emitting layer (6) includes at least one energy transfer auxiliary material in a hole transporting material. In the organic EL element (1), the energy transfer auxiliary material transfers excitation energy in the non-emitting layer (6) to the emitting layers (5, 7) adjacent to the non-emitting layer (6) effectively, so that luminous efficiency of the emitting layers (5, 7) can be enhanced. Moreover, it is difficult for holes to reach an electron transport layer (8), so that the electron transport layer (8) is not deteriorated, and the organic EL element (1) can thereby have a long life.</p> |
