Bottom emission type organic electroluminescent panel
View Patent ↗Provided is a bottom emission type organic EL panel capable of preventing or delaying loss of light emission from an end portion of the light emission area and reduction of the light emission area in an organic EL element. This organic electro luminescence panel includes an organic electro luminescence element having at least one organic layer between an anode and a cathode arranged on a substrate. This panel has a main light emission area emitting light with a high luminance and a non-light emission area or a low light emission area emitting light with a lower luminance than the main light emission area, arranged outside the end portion of the main light emission area. By limiting the main light emission area to a smaller size than the cathode forming area, the end portion of the cathode forming area is arranged outside the end portion of the main light emission area.
1. A bottom emission type organic electroluminescent panel equipped with an electroluminescent element comprising an anode and a cathode on a substrate and at least one organic layer between the anode and the cathode,
wherein the electroluminescent panel comprises:
a main emission area emitting light with a high luminance; and
a non-emission area or a low emission area emitting light with a relatively lower luminance than the main emission area, the non-emission area or low emission area being located outside an edge portion of the main emission area,
provided that an edge portion of a cathode forming area is arranged outside the edge portion of the main emission area by limiting the main emission area to a smaller size than the cathode forming area,
wherein, the anode lacks an insulating layer provided on a portion thereof which corresponds to the non-emission area or low emission area, and in an area of the anode which contacts the organic layer, the anode includes a first area having been subjected to a surface treatment to form the main emission area and an edge portion of the cathode forming area being arranged outside of the area having been subjected to the surface treatment, and the anode includes a second area which has not been subjected to the surface treatment and forms the non-emission area or low emission area.
2. The bottom emission type organic electroluminescent panel of claim 1 , wherein the surface treatment has been conducted via a treatment process including at least a plasma treatment.
3. The bottom emission type organic electroluminescent panel of claim 1 , wherein an emitted light is a white light.