Organic light-emitting device including a heteroaryl compound

An organic light emitting device comprising:

• a first electrode;
• a second electrode provided to face the first electrode;
• and
• one or two or more organic material layers provided between the first electrode and the second electrode,
• wherein one or more layers of the organic material layers comprise a compound represented by the following Chemical Formula 1:
• (HAr)a[L1-Ar1-L2-(CN)b]c [Chemical Formula 1]
• in Chemical Formula 1,
• a to c are each an integer of 1 to 3,
• when a to c are each 2 or more, two or more structures in the parenthesis are the same as or different from each other,
• L1 and L2 are the same as or different from each other, and are each independently a substituted or unsubstituted divalent to tetravalent aromatic ring group,
• Ar1 is a direct bond;
• or a substituted or unsubstituted arylene group, and
• HAr is a heteroaryl group represented by the following Chemical Formula A or B;
• in Chemical Formulae A and B,
• X1 to X3 are the same as or different from each other, and are each independently N, CH or CD,
• at least two of X1 to X3 is N,
• Ar2, Ar3, and R1 are the same as or different from each other, and are each independently hydrogen;
• or a substituted or unsubstituted aryl group, or combine with an adjacent group to form a substituted or unsubstituted ring,
• n is an integer of 1 to 7,
• when n is 2 or more, two or more R1's are the same as or different from each other, and
• --- is a moiety linked to L1,
• wherein in Chemical Formula 1, when HAr is Chemical Formula A, and b is 2, Ar1 is not a direct bond, and
• when HAr is Chemical Formula B, c is 1.