Film forming method, method for manufacturing organic electroluminescent device, organic electroluminescent device, and electronic apparatus
View Patent ↗A film forming method for forming a film including arranging a liquid composition on a substrate and drying the liquid composition, the liquid composition being obtained by dissolving a functional material in a solvent with a plurality of species of liquid mixed therein, is provided. The method includes: a) firstly reducing a pressure surrounding the liquid composition arranged on the substrate at a first depressurizing speed; b) increasing the pressure surrounding the liquid composition to a predetermined pressures after the step a); and c) secondly reducing the pressure surrounding the liquid composition at a second depressurizing speed, after the step b).
1. A film forming method for forming a film including arranging a liquid composition on a substrate and drying the liquid composition, the liquid composition being obtained by dissolving a functional material in a solvent with a plurality of species of liquid mixed therein, the method comprising:
a) firstly reducing a pressure surrounding the liquid composition arranged on the substrate to a first pressure level;
b) increasing the pressure surrounding the liquid composition to a predetermined second pressure level, after the step a); and
c) secondly reducing the pressure surrounding the liquid composition after the step b) to a third pressure level,
wherein the third pressure level of the step c) is lower than the first pressure level of the step a).
2. The film forming method according to claim 1 , wherein the step b) further includes supplying inert gas around the liquid composition.
3. The film forming method according to claim 1 , wherein the step b) further includes supplying vapor of the solvent around the liquid composition.
4. The film forming method according to claim 1 , further comprising applying the liquid composition by an ink jet method.
5. A method for manufacturing an organic electroluminescent device having a charge transport layer and a light emitting layer, comprising:
forming at least one of the charge transport layer and the light emitting layer by the film forming method according to claim 1 .
6. A film forming method for forming a film including arranging a liquid composition on a substrate and drying the liquid composition, the liquid composition being obtained by dissolving a functional material in a solvent with a plurality of species of liquid mixed therein, the method comprising:
a) firstly reducing a pressure surrounding the liquid composition arranged on the substrate at a first depressurizing speed;
b) increasing the pressure surrounding the liquid composition to a predetermined pressure, after the step a); and
c) secondly reducing the pressure surrounding the liquid composition at a second depressurizing speed, after the step b),
wherein the first depressurizing speed is less than the second depressurizing speed.
7. The film forming method according to claim 6 ,
wherein step a) occurs over a period of time that is greater than a period of time over which step c) occurs.
8. The film forming method according to claim 6 ,
wherein the first depressurizing step occurs over 180 seconds and the second depressurizing step occurs over 50 seconds.
9. The film forming method according to claim 6 , wherein the step b) further includes supplying inert gas around the liquid composition.
10. The film forming method according to claim 6 , wherein the step b) further includes supplying vapor of the solvent around the liquid composition.
11. The film forming method according to claim 6 , further comprising applying the liquid composition by an ink jet method.
12. A method for manufacturing an organic electroluminescent device having a charge transport layer and a light emitting layer, comprising:
forming at least one of the charge transport layer and the light emitting layer by the film forming method according to claim 6 .