TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The 4,9-diaza-pyrene-containing conjugated polymer (I) or (II) is prepared by adding 0.25 mmol 4,9-diaza-pyrene monomer and 0.25 mmol conjugated unit (Ar')-containing aromatic hydrocarbon monomer to reactor under nitrogen atmosphere, adding 10 mL organic solvent, adding 0.01 mmol palladium complex catalyst, reacting with heating and stirring for 48 hours, cooling, settling out polymer with methanol, dissolving dried product in toluene, processing using column chromatography using toluene as eluent, concentrating eluate, settling with methanol and drying product under vacuum. Preferred Composition: The 4,9-diaza-pyrene monomer is 5,10-dialkoxy-2,7-dihalo-4,9-diaza-pyrene of formula (III) or 5,10-dialkoxy-2,7-bis(2-halo-thiophene-5)-4,9-diaza-pyrene of formula (IV). The conjugated unit (Ar')-containing aromatic hydrocarbon monomer is carbon and nitrogen atoms-containing aromatic hydrocarbon monomer, cyano atoms-containing aromatic hydrocarbon monomer, carbon and sulfur atoms-containing aromatic hydrocarbon monomer, carbon and silicon atoms-containing aromatic hydrocarbon monomer, carbon, sulfur and nitrogen atoms-containing aromatic hydrocarbon monomer and/or carbon and silicon atoms-containing aromatic hydrocarbon monomer.X=not defined.Preferred Process: The 5,10-dialkoxy-2,7-dihalo-4,9-diaza-pyrene (III) is prepared by reacting 10 mmol 2,7-dihalo-5,10-dione-4,9-diazapyrene, 200 mL N,N-dimethylformamide and 22 mmol potassium t-butoxide for 30 hours, adding 30 mmol 1-bromoalkane, adding water, extracting mixture, separating and purifying through silica gel column chromatography. The 5,10-dialkoxy-2,7-bis(2-halo-thiophene-5)-4,9-diaza-pyrene (IV) is prepared by reacting 2 mmol 5,10-dialkoxy-2,7-dihalo-4,9-diazapyrene and 3.5 mmol 2-thiophene trimethyltin and 0.08 mmol tetrakis(triphenylphosphine)palladium as catalyst at 100 degrees C in 30 mL toluene for 18 hours, adding water and extracting, separating and purifying by silica gel column to obtain 5,10-dialkoxy-2,7-thiophene-4,9-diazapyrene, reacting 0.7 mmol 5,10-dialkoxy-2,7-thiophene-4,9-diazapyrene and 50 mL chloroform and adding 1.6 mmol N-bromosuccinimide, reacting for 12 hours, removing solvent and recrystallizing.