The preparation of colloidal suspension through a simple method, injection of a small amount of toluene solution of target materials into non-solvent acetonitrile, has been successfully demonstrated for C-60 and various conjugated polymers such as poly(3-alkylthiophene), polyfluorene derivative and MEH-PPV The colloidal suspension of mixtures of MEH-PPV and C-60 with almost equivalent weight ratio has also been obtained through the same process. The electrophoretic deposition from these suspensions results in nanostructured polymer film, as indicated by the AFM observation. Since the polymer films obtained through this process has worked as emission layer in a light-emitting device, the film obtained through this process will also be able to work in photocells. (c) 2004 Elsevier B.V. All rights reserved.