Method of manufacturing organic electronic device, and organic electronic device
View Patent ↗Provided is a method of manufacturing an organic electronic device, wherein an organic electronic device that controls the injection and mobility of carriers in an organic charge transport layer thereof is manufactured by laminating organic layers comprising the same charge transportable organic compound, when manufacturing the organic electronic device with the coating method. In this method of manufacturing an organic electronic device, which comprises a pair of electrodes on a substrate, and at least an organic functional layer and an organic charge transport layer in between the electrodes, the organic charge transport layer is formed by, in the following order: 1) a process for forming a first organic layer by coating, on the organic functional layer, a first organic layer coating-liquid, containing a charge transportable organic compound; and 2) a process for forming a second organic layer by coating, on the first organic layer, a second organic layer coating-liquid containing the charge transportable organic compound and a metallic compound. The method of manufacturing an organic electronic device is further specified by sections 3), 4), and 5).
1. A manufacturing method of an organic electronic device having a pair of electrodes on a substrate, and at least an organic functional layer and an organic charge transport layer between the electrodes wherein the organic charge transport layer comprises a first organic layer and a second organic layer, which comprises
a process for forming a first organic layer by coating, on the organic functional layer, a first organic layer coating-liquid containing a charge transportable organic compound; and
a process for forming a second organic layer by coating, on the first organic layer, a second organic layer coating-liquid containing the charge transportable organic compound and a metallic compound, in this order,
wherein
80% by mass or more of the charge transportable organic compound in each of the first organic layer and the second organic layer, respectively, is the same compound,
content of the metallic compound contained in the second organic coating-liquid is 20 to 40% by mass based on sum of content of the charge transportable organic compound and content of the metallic compound contained in the second organic layer coating-liquid, and,
the process for forming a second organic layer by coating the second organic layer coating-liquid is conducted at a temperature of 5 to 15° C. higher than melting point of a solvent used in the second organic layer coating-liquid.
2. The manufacturing method of the organic electronic device of claim 1 , wherein drying process is conducted after forming the first organic layer by coating the first organic layer coating-liquid.
3. The manufacturing method of the organic electronic device of claim 2 , wherein drying process is heating process at a temperature of 5 to 10° C. lower than a glass transition point of the charge transportable organic compound.
4. The manufacturing method of the organic electronic device of claim 1 , wherein the charge transportable organic compound is a compound represented by Formula (1),
in Formula (1), Ar and A′ represent independently an aromatic ring, and n represents an integer of 0 to 8.
5. The manufacturing method of the organic electronic device of claim 1 , wherein the metallic compound is alkali metal salt.
6. The manufacturing method of the organic electronic device of claim 1 , wherein the metallic compound is potassium salt.
7. The manufacturing method of the organic electronic device of claim 1 , wherein solvent of the first organic layer coating-liquid or the second organic layer coating-liquid is fluorinated alcohol.
8. The manufacturing method of the organic electronic device of claim 1 , wherein sum of the content of the organic compound and the metallic compound in the second organic layer coating-liquid is 0.1 to 3.0 mass %.
9. The manufacturing method of the organic electronic device of claim 1 , wherein the organic charge transport layer has a concentration gradient of the metallic compound in the thickness direction.
10. The manufacturing method of the organic electronic device of claim 1 , wherein the organic charge transport layer is an electron transport layer.
11. The manufacturing method of the organic electronic device of claim 1 , wherein the organic functional layer is an organic electroluminescence layer.
12. An organic electronic device manufactured by the manufacturing method of the organic electronic device claim 1 .