ANNEALING EFFECT ON PHOTOLUMINESCENCE AND DOPABILITY OF POLY(3-OCTADECYLTHIOPHENE) AND ITS COMPOSITES WITH FULLERENE

The effect of annealing on the optical properties and dopability of pr istine and C-60 - intercalated poly (3 - octadecylthiophene) (P3ODT) h ave been studied. After heat treatment of thin films of P3ODT increase d structuring in the optical absorption spectra and also significant c hange in Franck-Condon factors in photoluminescence spectra were obser ved. The shape of PL spectra of heated P3ODT become more wide. It is e xplained by better ordering and concentrating of polymer chains with l ong side groups (n=18) due to a ''zipper effect''. The PL of P3ODT(C-6 0)y (with y=0.01) thin film after moderate annealing was recovered to initial intensity and the shape of spectra was changed to the original one of pristine P3ODT. This behavior is explained by aggregation of C -60 molecules into large clusters, so that PL quenching effect of sing le C-60 molecules is suppressed.