Heteroaromatic compound and organic electroluminescence device using the same

A heteroaromatic compound of formula (1) below:

• wherein X1 is a divalent bridge selected from the group consisting of O, S, Se, CR4R5, NR6, and SiR7R8;
• X2 is absent or a divalent bridge selected from the group consisting of O, S, Se, CR9R10, NR11, and SiR12R13;
• A represents an unsubstituted fused ring hydrocarbon unit with two to nine rings;
• m is an integer of 0 to 4;
• B represents formula (2) below:
• wherein ring C represents a phenyl ring or a fused ring hydrocarbon unit with two to five rings;
• Y represents a divalent bridge selected from the group consisting of O, S, Se, CR14R15, NR16, and SiR17R18;
• when X2 is absent, R1 and R2 are independently a hydrogen atom, an unsubstituted alkyl group having 1 to 60 carbon atoms, an unsubstituted aryl group having 6 to 60 carbon atoms, an unsubstituted aralkyl group having 6 to 60 carbon atoms, an unsubstituted heteroaryl group having 3 to 60 carbon atoms, an unsubstituted arylamine group having 6 to 60 carbon atoms, or fused with the connected phenyl group to form a naphthyl group, a dibenzofuranyl group, or a dibenzothiophenyl group;
• when X2 is a divalent bridge selected from the group consisting of O, S, Se, CR9R10, NR11, and SiR12R13, R1 and R2 are independently a hydrogen atom, an unsubstituted alkyl group having 1 to 60 carbon atoms, an unsubstituted aryl group having 6 to 60 carbon atoms, an unsubstituted aralkyl group having 6 to 60 carbon atoms, an unsubstituted heteroaryl group having 3 to 60 carbon atoms, or an unsubstituted arylamine group having 6 to 60 carbon atoms;
• and R3 to R18 are independently a hydrogen atom, an unsubstituted alkyl group having 1 to 60 carbon atoms, an unsubstituted aryl group having 6 to 60 carbon atoms, an unsubstituted aralkyl group having 6 to 60 carbon atoms, an unsubstituted heteroaryl group having 3 to 60 carbon atoms, or an unsubstituted arylamine group having 6 to 60 carbon atoms.