We have investigated the class of disubstituted polyacatylene (PDPA) such a
s pristine and doped with C-60, using both transient and steady state spect
roscopies. These polymers show high yield photoluminescence which causes sp
ectral narrowing at high excitation intensities, despite of their ground st
ate degeneracy. In PDPA-nBu/C-60 mixture we found photoinduced charge trans
fer from the degenerate ground state polymer chains to the C-60 molecules.