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

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 340,000 and equal to or less than 400,000;
• 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:
• 3≦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≦−0.95 Ln(Z)+7.63 (Formula 3).