Method for producing organic light-emitting element, organic display panel, organic light-emitting device, method for forming functional layer, ink, substrate, organic light-emitting element, organic display device, and inkjet device

摘要

To provide a method of efficiently manufacturing an organic light-emitting element with excellent light-emitting characteristics by application, the method includes: preparing ink and filling an inkjet device having an ink ejection nozzle with ink; preparing a substrate having a base layer including a first electrode; and positioning the inkjet device above the substrate, and causing the inkjet device to eject a drop of the ink onto the base layer, wherein, in the preparation of the ink, a value Z denoting a reciprocal of the Ohnesorge number Oh determined by density ρ (g/dm3), surface tension γ (mN/m), and viscosity η (mPa·s) of the ink and a diameter r (mm) of the ink ejection nozzle satisfies Formula 1, in the ejection of the drop of the ink, speed V (m/s) of the ejected drop satisfies Formula 2, and the value Z and the speed V (m/s) satisfy Formula 3.

主权项

1. A method of manufacturing an organic light-emitting element, comprising:
preparing ink including functional material as a material for a functional layer and a solvent dissolving the functional material, and filling an inkjet device having an ink ejection nozzle with the ink, the functional material having a weight-average molecular weight equal to or greater than 200,000 and equal to or less than 250,000; preparing a substrate having a base layer including a first electrode; positioning the inkjet device above the substrate, and causing the inkjet device to eject a drop of the ink onto the base layer of the substrate; forming the functional layer by drying the ink ejected onto the base layer of the substrate; and forming a second electrode above the functional layer, wherein in the preparation of the ink, when a value Z denotes a reciprocal of the Ohnesorge number Oh determined by density ρ (g/dm3), surface tension γ (mN/m), and viscosity η (mPa·s) of the ink and a diameter r (mm) of the ink ejection nozzle, the value Z is within a range of Formula 1, in the ejection of the drop of the ink, speed V (m/s) of the ejected drop of the ink is within a range of Formula 2, and the value Z and the speed V (m/s) satisfy Formula 3:
1≦Z≦30;where Z=1/Ohnesorge number Oh;
1/Ohnesorge number Oh=(r·ρ·γ)1/2/η  (Formula 1); 3≦V≦6  (Formula 2); and V≦−1.18Ln(Z)+7.52  (Formula 3).