Heterocyclic compound and organic light emitting element including same

A heterocyclic compound of Chemical Formula 1:

• wherein, in Chemical Formula 1:
• Z is O or S;
• R1 to R4 are the same as or different from each other, and each independently is hydrogen, deuterium, a nitrile group, a nitro group, a hydroxyl group, a carbonyl group, an ester group, an imide group, an amide group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkylthioxy group, a substituted or unsubstituted arylthioxy group, a substituted or unsubstituted alkylsulfoxy group, a substituted or unsubstituted arylsulfoxy group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted amine group, a substituted or unsubstituted arylphosphine group, a substituted or unsubstituted phosphine oxide group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• n1 to n4 are the same as or different from each other and each independently is an integer of 0 to 3, and when n1 to n4 are an integer of 2 or greater, substituents in the parentheses are the same as or different from each other;
• A1 is hydrogen or -L1-Ar1, A2 is hydrogen or -L2-Ar2, A3 is hydrogen or -L3-Ar3, and A4 is hydrogen or -L4-Ar4;
• L1 and L3 are the same as or different from each other, and each independently is a direct bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group;
• L2 and L4 are the same as or different from each other, and each independently is a direct bond or a substituted or unsubstituted arylene group;
• at least two of A1 to A4 are not hydrogen;
• A1 and A2 bond to a symmetric position of a core structure;
• A3 and A4 bond to a symmetric position of a core structure;
• and
• Ar1 and Ar3 are the same as or different from each other and each independently by is one of the following Chemical Formula A;
• and
• Ar2 and Ar4 are the same as or different from each other and each independently is a nitrile group or one selected from among the following Chemical Formulae B to D, D-2, D-3, and D-5 to D7:
• wherein in Chemical Formulae A to D, D-2, D-3, and D-5 to D-7:
• is a bonding site;
• X1 to X3 are the same as or different from each other and each independently is N or CR5, and at least two of X1 to X3 are N;
• R5 to R8, Y1 and Y2 are the same as or different from each other, and each independently is hydrogen, deuterium, a nitrile group, a nitro group, a hydroxyl group, a carbonyl group, an ester group, an imide group, an amide group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkylthioxy group, a substituted or unsubstituted arylthioxy group, a substituted or unsubstituted alkylsulfoxy group, a substituted or unsubstituted arylsulfoxy group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted amine group, a substituted or unsubstituted arylphosphine group, a substituted or unsubstituted phosphine oxide group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• and
• n6 is an integer of 0 to 4, n7 is an integer of 0 to 3, and n8 is an integer of 0 to 6, and when n6 to n8 are an integer of 2 or greater, substituents in the parentheses are the same as or different from each other.