Heterocyclic compound, and composition for forming organic light-emitting element and organic material layer comprising same

A heterocyclic compound represented by the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• L1 and L2 are each independently a direct bond;
• a phenylene group;
• or a naphthylene group,
• l1 and l2 are each independently an integer from 0 to 3, and when l1 and l2 are each 2 or higher, substituents in the parenthesis are the same as or different from each other,
• R1 is hydrogen;
• or deuterium,
• r1 is an integer from 0 to 8, and when r1 is 2 or higher, R1's are the same as or different from each other,
• Z is —NR′R″;
• a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms;
• a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms;
• a substituted or unsubstituted heterocycloalkyl group having 3 to 60 carbon atoms;
• an aryl group having 6 to 15 carbon atoms, which is unsubstituted or substituted with deuterium or an aryl group;
• a triphenylene group which is unsubstituted or substituted with deuterium or an aryl group;
• an aryl group having 20 to 60 carbon atoms, which is unsubstituted or substituted with deuterium or an aryl group;
• a substituted or unsubstituted dibenzofuran group;
• a substituted or unsubstituted dibenzothiophene group;
• or a substituted or unsubstituted benzocarbazole group,
• X1 to X3 are each independently N or CR, and at least one thereof is N,
• Ar1 and Ar2 are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms;
• a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms;
• a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms;
• an aryl group having 6 to 60 carbon atoms, which is unsubstituted or substituted with deuterium or an aryl group;
• or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms,
• R, R′ and R″ are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms;
• a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms;
• a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms;
• a substituted or unsubstituted aryl group having 6 to 60 carbon atoms;
• or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, or
• R is bonded to Ar1 or Ar2 to form a substituted or unsubstituted hetero ring having 2 to 60 carbon atoms, and
• when Z is an aryl group having 6 to 15 carbon atoms, which is unsubstituted or substituted with an aryl group, Ar1 and Ar2 are hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms;
• a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms;
• a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms;
• an aryl group having 6 to 60 carbon atoms, which is unsubstituted or substituted with deuterium or an aryl group;
• a substituted or unsubstituted dibenzofuran group;
• or a substituted or unsubstituted dibenzothiophene group.