| 摘要 |
PURPOSE:To reduce non-light emitting parts in a light emission surface, and improve light emission efficiency in an organic electroluminescent element having an organic layer between a positive electrode and a negative electrode by providing an island-like silver distribution layer between the organic layer and the negative electrode. CONSTITUTION:In an organic electroluminescent element having an organiclayer between electrodes comprising a positive electrode and a negative electrode, a silver distribution layer which is seen like an island by observation by a scan type electron microscope or a transmission type electron microscope is provided between the layer most on the negative electrode side and the negative electrode. The organic electroluminescent element emits light when holes charged from the positive electrode and electrons charged from the negative electrode are recombined with each other in a light emission layer, where charge of the electrons have effects of an interface condition because it is performed at the interface between the negative electrode and the organic layer. By providing the silver distribution layer at the interface between the negative electrode and the organic layer, tightness between the negative electrode and the organic layer is improved to form a new hierarchy at the interface. As a result, non-light emitting parts in the light emission surface can be reduced, thereby light emission efficiency can be improved regardless of what is used for material of the negative electrode. |
