TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Thio group-containing compound of formula (VII) is reacted with fluoride ion source in presence of halonium ion generating agent to obtain fluorine-containing compound (I).Ar1,Ar2,R2,R3,s,t=same as defined above;andX,Y=alkyl thio or alkylene dithio formed by connecting alkyl portion of alkyl thio group, or thio carbonyl.Preferred Compound: The fluorine-containing compound (I) is preferably of formula (II).R1-R3=same as defined above;Z1,Z2=group of formula (i-viii), preferably group of formula (i);u,v=0-2;andR4,R5=H or monovalent substituent, and group of formula (viii) is optionally left inverting.Preferred Components: The fluoride ion source is chosen from hydrogen chloride, complex of hydrogen fluoride and amine, complex of hydrogen fluoride and pyridine, dihydrogen trifluoride quaternary ammonium, and dihydrogen trifluoride quaternary phosphonium. The halonium ion generating agent is 1,3-dibromo-5,5-dimethyl hydantoin, N-bromo succinimide, N-bromo acetamide, 2,4,4,6-tetrabromo-2,5-cyclohexa dienone or N-iodo succinimide. Preferred Process: An organic thin film is formed using the fluorine-containing compound and/or its polymer by vacuum evaporation method, spin coat method, inkjet printing method, dispenser printing method or flexographic printing method.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: A fluoropolymer having fluorine-containing repeating unit of formula (III) is formed using the fluorine-containing compound (I).Ar1,Ar2,R1-R3,s,t=same as defined above.The repeating unit (III) is preferably of formula (IV). The fluoropolymer further contains bivalent group-containing repeating unit of formula (V): -(Ar3)-.R1-R5,Z1,Z2,u,v=same as defined above;Ar3=(un)substituted bivalent aromatic hydrocarbon or bivalent heterocyclic group, preferably group of formula (VI);R6-R9=H or monovalent substituent;andZ3=group of formula (i-ix), preferably group of formula (i), and combines with each other and R6 and R7 or R8 and R9 to form ring. Preferred Definitions:    R1=fluorine atom.    SPECIFIC COMPOUNDS - 15 examples for fluorine-containing compound of formula (I), such as fluorine-containing compounds of formulae (A1-A5) are disclosed.    EXAMPLE - N-bromo succinimide (in mg) (489) and dichloro methane (4 ml) were mixed and cooled at -78degreesC. Hydrogen fluoride pyridine (1 ml) having hydrogen fluoride content of 60-70% was added. Dichloromethane solution of thio phenyl compound (formula (78)) (105) was added. The dichloromethane solution was stirred and heated at 0degreesC. The obtained reaction solution was diluted with 0degreesC hexane and passed through basic alumina column. The diluted solution was concentrated and purified to obtain yellow solid of fluorine-containing compound of formula (A1) (83) with yield of 57%. The obtained compound (A1) was used for forming fluorine-containing polymer. The obtained polymer was used for forming organic thin film. The obtained organic thin film had excellent electron transport property or hole transport property.