2,2'-BIBENZODIMIDAZOLIDENE COMPOUND HAVING CONDENSED RINGS AT THE 1-, 1'-, 3- AND 3'-POSITIONS, AND ORGANIC LIGHT-EMITTING ELEMENT, DISPLAY DEVICE, IMAGE INFORMATION PROCESSING APPARATUS, LIGHTING DEVICE, IMAGE FORMING APPARATUS AND EXPOSURE UNIT, EACH CONTAINING THE SAME

摘要

A stable 2,2'-bibenzo[d]imidazolidene compound is provided. The 2,2'-bibenzo[d]imidazolidene compound is expressed by the following General Formula (1). In General Formula (1), Ar1 to Ar8 each represent a substituted or unsubstituted condensed ring. R1 to R8 each represent a hydrogen atom or a substituent.