Polycyclic compound and organic light emitting device comprising same

A multicyclic compound represented by the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• X is O;
• S;
• or NR21;
• L1 and L2 are the same as or different from each other, and each independently a direct bond;
• or a substituted or unsubstituted arylene group;
• Ar is a substituted or unsubstituted aryl group;
• a substituted or unsubstituted heteroaryl group;
• or a substituted or unsubstituted amine group;
• N-Het is a monocyclic or multicyclic heteroaryl group substituted or unsubstituted and including one or more Ns, and when L1 is a direct bond, the N-Het is a tricyclic or lower heteroaryl group substituted or unsubstituted and including one or more Ns;
• R1 to R3 are the same as or different from each other, and each independently selected from the group consisting of hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted alkenyl group;
• a substituted or unsubstituted alkynyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted heterocycloalkyl group;
• a substituted or unsubstituted aryl group;
• a substituted or unsubstituted heteroaryl group;
• a substituted or unsubstituted phosphine oxide group;
• and a substituted or unsubstituted amine group, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted aliphatic hydrocarbon ring, a substituted or unsubstituted aromatic hydrocarbon ring, a substituted or unsubstituted aliphatic heteroring, or a substituted or unsubstituted aromatic heteroring;
• R21 is a phenyl group;
• or a naphthyl group;
• m and n are each an integer of 1 to 5;
• r1 is an integer of 1 to 4;
• r2 is an integer of 0 to 2;
• r3 is an integer of 1 to 4;
• and
• when r2 is 2 and m, n, r1 and r3 are an integer of 2 or greater, substituents in the parentheses are the same as or different from each other.