MANUFACTURING METHOD OF ORGANIC ELECTROLUMINESCENT ELEMENT AND ORGANIC ELECTROLUMINESCENT ELEMENT

• Main Authors: SAKURAI MANABU, BANDO AKIMASA, SAITO KEIKO, OSHIMA YUKI
• Format: Patent
• Language: English; Japanese
• Published: 20.09.2023
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

To improve uniformity of a film thickness in a region surrounded by a bank in the case where a functional membrane constructing an organic electroluminescent element is formed by a wet type film formation.SOLUTION: A manufacturing method of an organic electroluminescent element, comprises the steps of, in order: providing a plurality of open parts in a fine region by a photo-lithography method by applying a liquid-repellent resist onto a glass substrate having a conductive electrode pattern; applying functional inc containing at least one kind of functional material and at least one kind of organic solvent to the open part by a printing method; vaporizing the organic solvent contained in the functional inc by a depression drying; and sintering a film obtained by the depression drying at a temperature of 150°C or higher to obtain a functional membrane. The organic solvent contains an organic solvent having a contact angle of 26° or more and 50° or less with respect to a predetermined film.SELECTED DRAWING: Figure 1 【課題】有機電界発光素子を構成する機能性膜を湿式成膜により形成する場合において、バンクに囲まれた領域内における膜厚の均一性を改善する。【解決手段】導電性の電極パターンを有するガラス基板上に撥液レジストを塗布して、フォトリソグラフィー法によって微小領域の開口部を複数設ける工程と、少なくとも１種の機能性材料と少なくとも１種の有機溶媒とを含む機能性インクを、印刷法によって前記開口部に塗布する工程と、前記機能性インクに含まれる前記有機溶媒を減圧乾燥によって揮発させる工程と、前記減圧乾燥によって得られた膜を１５０℃以上の温度で焼結し、機能性膜を得る工程と、をこの順で含み、所定の膜に対して、２６°以上５０°未満の接触角を有する有機溶媒を前記有機溶媒が含む、有機電界発光素子の製造方法。【選択図】図１