| abstract |
The thiadiazole represented by formula ( 2 ) or ( 4 ), when used as a light-emitting material in a light-emitting element, allows the light-emitting element to emit near-infrared light: n n n n n n n n n n [In formulae ( 2 ) and ( 4 ), each R independently represents a hydrogen atom, an alkyl group, or a substituted or unsubstituted aryl group. There may be a ring formed by a carbon linkage between two adjacent R's.] |