NEAR IR PHOTOLUMINESCENCE IN MIXED FILMS OF CONJUGATED POLYMERS AND FULLERENES

The photoinduced electron transfer between conjugated polymers and a s eries of functionalized fullerenes was studied, A new photoluminescenc e signal was observed in the near IR (similar to 1,4 eV), This weak IR photoluminescence does not result from direct excitation of the fulle rene, but from radiative electron-hole recombination between the fulle rene excited state and the polymer ground state. The intensity of this recombination luminescence depends on the electrochemical nature of t he functional group; it is observed only for fullerenes with first red uction potential higher than that of C-60. (C) 1997 American Institute of Physics.