| abstract |
Provided is a composition comprising a condensed heterocyclic compound represented by the following formula (I), (a) an organic material, and (b) at least one of the condensed heterocyclic compounds. (Y represents a chemical single bond, —S (═O) —, or —SO 2 —. R a and R b each represents an optionally substituted organic group having 1 to 30 carbon atoms. Z a and Z b represent a chemical single bond or —SO 2 —, X 1 and X 2 represent a hydrogen atom, etc. n and m each independently represent an integer of 0 to 2, n And one of m and m is not 0.) |