A novel conductive polymer poly{2,7-(9,9-didodecyl-fluorene)-alt-[3,3′-p-di(dicyanide-vinylidene-phenyl)-bithiophene]}(PFC12Th-DCN) is synthesized by Suzuki cross-coupling reaction. The photoluminescence (PL) spectra, ultraviolet-visible absorption spectra and excited spectra of PFC12Th-DCN thin films are investigated in detail. The experimental results show that the conductive polymer has strong absorption from 300 nm to 450 nm and an absorption peak at 375 nm. Excited by 375 nm light, the PL spectrum of PFC12Th-DCN has a peak emission at about 625 nm, showing that it is an orange-yellow luminescent material. The electroluminescence (EL) device: ITO/PEDOTPSS/PFC12Th-DCN/Al is prepared. The turn-on voltage of the device is 5 V. The peak emission wavelength is about 649 nm and the chromaticity coordinate locates at (0.62, 0.36). Compared with its PL spectrum, the EL spectrum shows a red shift of about 25 nm. Based on the experimental results, the emission red shift is attributed to the PFC12Th-DCN molecules aggregation induced emission.