TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The oxide semiconductor fine particles contain titanium dioxide, zinc oxide or tin oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): An oxygen-containing aromatic compound of formula (IIIa) is reacted in presence of N-iodosuccinic acid imide to obtain iodine-substituted oxygen-containing compound of formula (IIIb), which is further reacted with tetramethyl dioxaborolane derivative of formula (IIIc) in presence of palladium catalyst to obtain bromine-containing aromatic compound of formula (IIId). The compound (IIId) is reacted with dioxaborolane unit-containing compound of formula (IIIe) in presence of palladium catalyst to obtain precursor compound of formula (IIIf), which is reacted with methyl derivative to obtain aromatic compound (I). Preferred Definitions:    R1=residue obtained by removing H from benzene ring b1 of compound of formula (IIc);    Z3,Z4=halo;    A23,A24=H, halo, aliphatic hydrocarbyl, or alkoxy;    R14,R15=group of formula (IId);    R12,R13=H or 1-8C alkyl;    R16-R19=H or 1-4C alkoxy;and    R2=group chosen from groups of formulae (IIe)-(IIj).    SPECIFIC COMPOUNDS - 1 Aromatic compound is specifically claimed i.e. 7-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-2-(5-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-3-yl)-12,12-difluoro-10,14-bis(2-methoxyphenyl)-11,13-diaza-12-borapentacyclo(11.7.0.03,11.04,9.015,20)icosa-1(20),2,4(9),5,7,10,14,16,18-nonaen-11-ylium-12-uide of formula (Ia).    EXAMPLE - 0.13 pts. wt. 7-(5-(4-(Bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-2-(5-(5-formylthiophen-2-yl)thiophen-2-yl)thiophen-3-yl)-12,12-difluoro-10,14-bis(2-methoxyphenyl)-11,13-diaza-12-borapentacyclo(11.7.0.03,11.04,9.015,20)icosa-1(20),2,4(9),5,7,10,14,16,18-nonaen-11-ylium-12-uide and 0.047 pts. wt. cyanoacetic acid were dissolved in 18 pts. wt. ethanol:toluene (2:1) liquid mixture, 0.005 pts. wt. anhydrous piperazine was added and reacted for 1 hour. 0.047 pts. wt. cyanoacetic acid was added to the resultant mixture, and reacted for further 3 hours, 0.047 pts. wt. cyanoacetic acid and 0.005 pts. wt. anhydrous piperazine were added, and reacted for 3 hours. Chloroform-water was separated from the product and the reaction mixture was purified by column chromatography after concentrating extraction to obtain 0.051 pts. wt. 7-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-2-(5-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-3-yl)-12,12-difluoro-10,14-bis(2-methoxyphenyl)-11,13-diaza-12-borapentacyclo(11.7.0.03,11.04,9.015,20)icosa-1(20),2,4(9),5,7,10,14,16,18-nonaen-11-ylium-12-uide, as black green solid.