Method for manufacturing organic functional layer and organic functional device, and organic functional device manufacturing apparatus

1. A method for manufacturing an organic functional layer, comprising the steps of:

forming a coated film of an organic functional material by applying a coating liquid to a substrate by a printing method, the coating liquid including an organic functional material dissolved or dispersed in a first organic solvent;

bringing the coated film into contact with vapor or liquid of a second organic solvent, and

removing the first organic solvent inside the coated film,

the second organic solvent having the following properties:

(1) chemically non-active;

(2) the second organic solvent can be mixed with the first solvent;

(3) the second organic solvent can not substantially dissolve the organic functional material; and

(4) a vapor pressure of the second organic solvent is higher than that of the first organic solvent at a room temperature,

wherein the step of forming the coating film includes a relief printing type offset printing method or an ink-jet printing method,

wherein the first organic solvent is a mixed solvent of 50% toluene and 50 para diethylbenzene, and

wherein the second organic solvent is ethyl nona fluorobutyl ether.

2. The method for manufacturing an organic functional layer according to claim 1 ,

wherein the step of bringing the coated film into contact with vapor or liquid of the second organic solvent includes a step of dipping the substrate in a rinse bath, the bath filled with the liquid second organic solvent, and a step of bringing the coated film into contact with the vapor of the second organic solvent.

3. The method for manufacturing an organic functional layer according to claim 1 ,

wherein the step of bringing the coated film into contact with the vapor or liquid of the second organic solvent includes a step of spraying a mist of the second organic solvent to the substrate.

4. The method for manufacturing an organic functional layer according to claim 1 , further comprising a step of heating the substrate after the step of bringing the coated film into contact with the vapor or liquid of the second organic solvent, in which both steps are performed in an identical space filled with a non-active gas.

5. The method for manufacturing an organic functional layer according to claim 1 ,

wherein the step of bringing the coated film into contact with the vapor or liquid of the second organic solvent is a step of bringing the coated film into contact with the vapor of the second organic solvent, and

wherein the method further comprises a step of bringing a fluid including the second organic solvent into contact with a back surface of the substrate, the back surface being an opposite surface to a surface where the coated film is formed, or into contact with a substrate installing part in contact with the back surface.

6. The method for manufacturing an organic functional layer according to claim 5 ,

wherein the following two steps are performed simultaneously:

the step of bringing the coated film into contact with the vapor of the second organic solvent; and the step of bringing a fluid including the second organic solvent into contact with a back surface of the substrate, the back surface being an opposite surface to a surface where the coated film is formed, or into contact with a substrate installing part in contact with the back surface.

7. The method for manufacturing an organic functional layer according to claim 5 ,

wherein a temperature of the second organic solvent used in the following step is more than a dew point of an ambient gas in a place where the substrate is installed, and is lower than a boiling point of the second organic solvent: the step of bringing a fluid including the second organic solvent into contact with a back surface of the substrate, the back surface being an opposite surface to a surface where the coated film is formed, or into contact with a substrate installing part contact with the back surface.

8. The method for manufacturing an organic functional layer according to claim 5 ,

wherein the second organic solvent and a chemically non-active gas are simultaneously brought into contact with the back surface or the substrate installing part in the following step: the step of bringing a fluid including the second organic solvent into contact with a back surface of the substrate, the back surface being an opposite surface to a surface where the coated film is formed, or into contact with a substrate installing part contact with the back surface.

9. The method for manufacturing an organic functional layer according to claim 1 ,

wherein a change of a surface roughness Ra of the organic functional layer from a time when the organic functional layer is dipped in the liquid second organic solvent to a time when 24 hours passed is less than 1%, and

wherein a weight of the organic functional layer which is dissolved in the second organic solvent after 24 hours has passed is less than 0.1% of a weight of the organic functional layer after a dry processing.

10. The method for manufacturing an organic functional layer according to claim 1 ,

wherein a surface tension of the second organic solvent is equal to or less than 25 mN/m.

11. The method for manufacturing an organic functional layer according to claim 1 ,

wherein a molecule in the second organic solvent has 5 or more fluorine atoms.

12. A method for manufacturing an organic functional device, comprising:

forming at least one layer of an organic functional layer included in an organic functional device by a method for manufacturing a functional layer according to claim 1 .