[The spectral properties of fullerences doped conjugated polymer composite films].

In this paper, we studied the optical properties of the charge transfer system in poly2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene, which was doped by C60 with different consistence, by means of ultraviolet-visible absorption spectrum, steady-state photoluminescence (PL) and time-resolved photoluminescence (TRPL). We observed the restraining effect of absorption peak and PL quenching of fluorescence, which is regarded as the formation of complex compound in the mixed conjugated polymer. The formation is the result of the strong interaction of pi-pi conjugated system in the base state in the films, which associated with the direct MEH-PPV to C60 charge transfer. In the excited state, the excited charge transfer advanced the restraint of luminant transition process, which strengthen the PL quenching of MEH-PPV.