THIN FILM FOR ORGANIC EL DEVICE AND MANUFACTURING METHOD THEREOF

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The present invention relates to a method for manufacturing a thin film of a rare earth complex polymer with low solubility in an organic solvent and to an organic EL device including a thin film of a rare earth complex polymer obtained using this method, the thin film used as a light-emitting layer. A method for manufacturing a rare earth complex polymer thin film includes a step (1) in which a micelle-containing solvent (A) that includes a rare-earth complex and a ferrocenyl surfactant and a micelle-containing solvent (B) that includes a polydentate ligand and a ferrocenyl surfactant are mixed to form a mixed micelle-containing solvent, and a step (2) in which electrolysis is performed using the mixed micelle-containing solvent as an electrolyte, and formed on a positive electrode surface is a thin film of a rare earth complex polymer that includes the rare earth complex and polydentate ligand.