Organic EL element, organic EL panel, organic EL light-emitting apparatus and organic EL display apparatus
View Patent ↗An organic EL element including: pixel electrode on a section of TFT substrate corresponding to pixel region; auxiliary connector on a section of TFT substrate corresponding to auxiliary region; hole injection layer on pixel electrode and auxiliary connector; and light-emitting layer on a section of hole injection layer corresponding to pixel region. The organic EL element additionally includes: electron injection layer on light-emitting layer and a section of hole injection layer corresponding to auxiliary region; and seamless common electrode on electron injection layer. Hole injection layer contains WO x . Electron injection layer contains NaF. Common electrode contains Al that causes the reduction of NaF contained in electron injection layer.
1. An organic EL element including: a substrate; and a pixel region and an auxiliary region formed adjacent to each other on the substrate, comprising:
a pixel electrode formed on a section of the substrate corresponding to the pixel region;
an auxiliary connector formed on a section of the substrate corresponding to the auxiliary region;
a first functional layer formed to cover the pixel electrode and the auxiliary connector;
a light-emitting layer containing organic light-emitting material and formed on a section of the first functional layer corresponding to the pixel region;
a second functional layer formed to cover the light-emitting layer and formed on a section of the first functional layer corresponding to the auxiliary region; and
a common electrode formed to seamlessly cover a section of the second functional layer corresponding to the pixel region and a section of the second functional layer corresponding to the auxiliary region, wherein
the first functional layer consists of an oxide compound of a transition metal,
the second functional layer contains a fluoride compound of at least one of an alkali metal and an alkaline-earth metal,
the common electrode contains a metal that causes reduction of the fluoride compound contained in the second functional layer,
a maximum thickness of the section of the second functional layer corresponding to the auxiliary region is equal to or smaller than a maximum peak-to-valley height Rmax in a roughness profile of a surface of the section of the first functional layer corresponding to the auxiliary region, and
the section of the second functional layer corresponding to the auxiliary region consists of portions of the second functional layer corresponding to the auxiliary region, wherein the portions of the second functional layer corresponding to the auxiliary region are in valleys of the surface of the section of the first functional layer corresponding to the auxiliary region with peaks of the surface of the section of the first functional layer corresponding to the auxiliary region being in direct contact with the common electrode.
2. The organic EL element of claim 1 , wherein
an XPS spectrum of the section of the first functional layer corresponding to the auxiliary region exhibits a greater upward protrusion than an XPS spectrum of the section of the first functional layer corresponding to the pixel region within a range between a lowest binding energy level corresponding to respective peaks of the XPS spectra and a binding energy level that is 3.6 eV lower than the lowest binding energy level.
3. The organic EL element of claim 1 , wherein
an average oxidation number of the transition metal contained in the section of the first functional layer corresponding to the auxiliary region is smaller than an average oxidation number of the transition metal contained in the section of the first functional layer corresponding to the pixel region.
4. The organic EL element of claim 1 , wherein
the transition metal is W, Mo, or V.
5. The organic EL element of claim 1 , wherein
the fluoride compound contained in the second functional layer is NaF, BaF 2 , CaF 2 , CsF, or MgF 2 .
6. The organic EL element of claim 1 , wherein
the metal that causes the reduction is Al, Cu, Ag, or Mg.
7. An organic EL panel having the organic EL element according to claim 1 provided in a plurality.
8. An organic EL light-emitting apparatus having the organic EL element according to claim 1 and a drive circuit for driving the organic EL element.
9. An organic EL display apparatus having the organic EL element according to claim 1 and a drive circuit for driving the organic EL element.
10. The organic EL element of claim 1 , wherein the first functional layer is formed by a sputtering method.
11. The organic EL element of claim 1 , wherein the transition metal is tungsten.
12. The organic EL element of claim 1 , wherein
the first functional layer has a thickness of 1 nm to 50 nm, and
the portions of the second functional layer corresponding to the auxiliary region and in the valleys of the surface of the section of the first functional layer corresponding to the auxiliary region have a thickness of 0.1 nm to 1 nm.
13. The organic EL element of claim 1 , wherein portions of the common electrode corresponding to the auxiliary region are in the valleys of the surface of the section of the first functional layer corresponding to the auxiliary region.
14. The organic EL element of claim 1 , wherein a surface of a section of the common electrode corresponding to the auxiliary region is in contact with the peaks of the surface of the section of the first function layer corresponding to the auxiliary region, and in contact with the portions of the second functional layer corresponding to the auxiliary region which are in the valleys of the surface of the section of the first functional layer corresponding to the auxiliary region.
15. The organic EL element of claim 1 , wherein a surface of a section of the common electrode corresponding to the auxiliary region and in contact with the peaks of the surface of the section of the first function layer corresponding to the auxiliary region is not planar.