Heterocyclic compound, composition for organic layer including the same and light emitting device including the same

A heterocyclic compound represented by Formula 1:

• wherein two adjacent groups of R1 to R4 are linked to form an aromatic ring represented by
• and
• among the remaining two groups of R1 to R4 that do not form the aromatic ring and R5 to R12:
• one is a group represented by Formula 2;
• another is a benzocarbazole group having 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 bonded to a nitrogen atom;
• and
• the remaining ones are each independently selected from the groups consisting of hydrogen, deuterium, a halogen, a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms, a substituted or unsubstituted alkoxy 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, a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, —SiRR′R″, or —P(═O)RR′, wherein two or more adjacent groups among the remaining ones are optionally linked to form a substituted or unsubstituted 5- to 9-membered saturated or unsaturated ring;
• and
• R, R′ and R″ are each independently hydrogen, deuterium, —CN, 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 aryl group having 6 to 60 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms:
• in Formula 2, Ar1 and Ar2 are each independently 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,
• L1, L2, and L3 are each independently a direct linkage, a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms,
• a, b and c are each independently an integer of 0 to 5,
• when a is an integer of 2 to 5, a plurality of L1 groups are the same or different,
• when b is an integer of 2 to 5, a plurality of L2 groups are the same or different,
• when c is an integer of 2 to 5, a plurality of L3 groups are the same or different, and
• * represents a bonding site.