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

A heterocyclic compound represented by the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• R1 to R3 are the same as or different from each other, and each independently selected from the group consisting of hydrogen;
• deuterium;
• halogen;
• a cyano group;
• a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C2 to C60 alkenyl group;
• a substituted or unsubstituted C2 to C60 alkynyl group;
• a substituted or unsubstituted C1 to C60 alkoxy group;
• a substituted or unsubstituted C3 to C60 cycloalkyl group;
• a substituted or unsubstituted C2 to C60 heterocycloalkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• a substituted or unsubstituted C2 to C60 heteroaryl group;
• —P(═O)R101R102;
• —SiR101R102R103;
• and —NR101R102, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted C6 to C60 aromatic hydrocarbon ring;
• or a substituted or unsubstituted C2 to C60 heteroring, and R101, R102 and R103 are the same as or different from each other and each independently a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group;
• a is an integer of 0 to 4, and when a is 2 or greater, R1s are the same as or different from each other;
• b is an integer of 0 to 4, and when b is 2 or greater, R2s are the same as or different from each other;
• c is an integer of 0 to 5, and when c is 2 or greater, R3s are the same as or different from each other;
• Ar1 and Ar2 are the same as or different from each other, and each independently a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group including one or more of O;
• or S as a heteroatom;
• L1 to L3 are the same as or different from each other, and each independently a direct bond;
• a substituted or unsubstituted C6 to C60 arylene group;
• or a substituted or unsubstituted C2 to C60 heteroarylene group including one or more of O;
• or S as a heteroatom;
• and
• l, m and n are an integer of 0 to 5, and when 1 is 2 or greater, L1s are the same as or different from each other, when m is 2 or greater, L2s are the same as or different from each other, and when n is 2 or greater, L3s are the same as or different from each other.