| 摘要 |
PURPOSE: An organic electroluminescent device is provided to extend lifetime by forming a hole transport/injection layer by simultaneously depositing triphenylene compound derivatives and an organic compound which has a higher HOMO(Highest Occupied Molecular Orbital) level compared to the triphenylene compound derivatives. CONSTITUTION: A first electrode and a second electrode are provided. A light emitting material layer(140) is located between the first electrode and the second electrode and has a first HOMO(Highest Occupied Molecular Orbital) level. The first organic material layer which has a fourth HOMO level includes triphenylene compound derivatives which have a second HOMO level and an organic compound which has a third HOMO level. The third HOMO level is located between the first HOMO level and the second HOMO level. |
