TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali in the alkaline environment is alkali metal hydroxide, alkali carbonate and/or tetraethyl ammonium hydroxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Prepared Process: The fluorene copolymer is prepared by subjecting suzuki coupling reaction for substituted indene compound of formula (A), bromine substituted methane compound of formula (B) and substituted quinoxaline compound of formula (C) under anaerobic and alkaline environment in presence of catalyst and organic solvent at 65-130 degrees C for 12-72 hours to obtain the fluorene copolymer comprising quinoxaline unit. The substituted indene compound A is prepared by reacting 2,7-dibromo-9,9-dialkyl fluorene, alkyl derivative of lithium and 2-isopropoxy-4,4,5,5-tetramethyl- 1,3,2-dioxpentaborane in anhydrous and anaerobic environment at -100--20 degrees C in the organic solvent system, where molar ratio of the 2,7-dibromo-9,9-dialkyl fluorene, alkyl derivative of lithium and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2dioxpentaboran is 1: (2.0-4.0): (2.0-4.0). The alkyl derivative of lithium is n-butyl lithium, tertbutyl lithium, lithium methide and/or phenyl lithium. The organic solvent is tetrahydrofuran, aether, methylene dichloride, trichloromethane and/or ethyl acetate. The bromine substituted methane compound B is prepared by reacting thiofuran unit (Ar1 compound) such as substituted thiofuran compound (II), substituted thiofuran compound (III), substituted thiofuran compound (IV), substituted thiofuran compound (V), substituted thiofuran compound (VI), substituted thiofuran compound (VII) and substituted thiofuran compound (VII), which are not substituted by the bromine and the N-bromosuccinimide in presence of organic solvent at -5-30 degrees C to generate the bromine substituted methane compound B, where molar ratio of the Ar1 compound to the N- bromosuccinimide is 1: (2.0-2.5). The organic solvent is N-dimethyllformamide, tetrahydrofuran, aether, methylene dichloride, trichloromethane, ethyl acetate and/or acetic acid. The substituted quinoxaline compound C is prepared by reacting 3,6-dibromo-benzene1,2-diamine and alkyldione in presence of catalyst and organic solvent at 20-40 degrees C, where the molar ratio of the 3,6-dibromo-benzene-1,2-diamine to the alkyldione is 1: (1-2). The catalyst is toluenesulfonic acid, acetic acid or NH4Cl. The dosage of catalyst is 0.01-10 times of the molar amount of the 3,6-dibromo-benzene-1,2-diamine. The organic solvent is trichloromethane, tetrahydrofuran, aether, methylene dichloride or ethyl acetate. The molar ratio of the substituted indene compound A to the bromine substituted methane compound B to the substituted quinoxaline compound C is 1.0: a: b in the suzuki coupling reaction. The catalyst for suzuki coupling reaction is organic palladium catalyst or mixture of the organic palladium catalyst and organic phosphorus ligand with dosage of 0.05-20% of the molar amount of the compound A. The organic solvent is toluene, tetrahydrofuran, trichloromethane and/or ethyl acetate. The organic palladium catalyst is tris(dibenzylideneacetone)dipalladium, tetrakis(triphenylphosphine)palladium and bis(triphenylphosphine)palladiumchloride. The organic phosphorus ligand catalyst is tri(o-tolyl)phosphine.