TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Processes: The copolymer is prepared by utilizing dibromo-anthra-diisoquinoline tetrone compound of formula (I1) and methyl-cyclopenta-pyrrole-dione compound of formula (I2). The dibromo-anthra-diisoquinoline tetrone compound is prepared by dissolving a perylene compound of formula (A) and a phenylamine compound of formula (B) in a second organic solvent, and performing condensation reaction to obtain finished product. The methyl-cyclopenta-pyrrole-dione compound is prepared by utilizing a dibromo-thieno-pyrrole compound of formula (C) and a methyl-thiophene compound of formula (D), performing Stille coupling reaction to the dibromo-thieno-pyrrole compound and methyl-thiophene compound in presence of a second catalyst and a third organic solvent at 60-110 degrees C for 72 hours to generate the dicyclopenta-dienyl-pyrrole compound of formula (I21). The dicyclopenta-dienyl-pyrrole compound is added to bromosuccinimide in a mole ratio of 1:2-2.5, and bromination reaction is performed in presence of a fourth organic solvent at 20-120 degrees C to generate an 4,6-Bis-bromo-cyclopenta pyrrole compound of formula (I22). The 4,6-Bis-bromo-cyclopenta pyrrole compound is added with lithium and tributyltin chloride or methyltin chloride in the mole ratio of 1:1-2:2, reacted in presence of a fifth organic solvent at -50-20 degrees C for 0.5-2 hours, cooled to room temperature, and continuously reacted for 5-40 hours to obtain methyl-cyclopenta-pyrrole-dione compound. Preferred Components: The first catalyst is a mixture of organic palladium catalyst and organic phosphine ligand or organic palladium catalyst. The first organic solvent is tetrahydrofuran, ethylene glycol dimethyl ether, benzene or toluene. The second organic solvent is quinoline, imidazole, butanol or N-methyl-2-pyrrolidone. The second catalyst is a mixture of organic palladium catalyst and organic phosphine ligand or organic palladium catalyst. The third organic solvent is tetrahydrofuran, ethylene glycol dimethyl ether, benzene or toluene. The fourth organic solvent is tetrahydrofuran, chloroform, 2, 5-dichlorobenzene. The fifth organic solvent is tetrahydrofuran, ether or dioxane. The organic palladium is tris(dibenzylideneacetone)dipalladium(0), tetrakis(triphenylphosphine)palladium(0) or bis(triphenylphosphine)palladium(II)chloride. The organic phosphorus ligand is tri(o-tolyl)phosphine. Preferred Composition: The mole ratio of the perylene compound and phenylamine compound is 1:3-10. The adding amount of the second catalyst is 0.01-10% of the total mass. The mole ratio of the dibromo-thieno-pyrrole compound and methyl-thiophene compound is 1: 2. The ratio of the organic palladium catalyst and organic phosphine ligand is 1:2-20. Preferred Properties: The condensation reaction is performed at reaction temperature of 60-100 degrees C for 1-72 hours. The reaction temperature of the Stille coupling reaction is 50 to 120 degrees C and time is 24 to 72 hours.