Nitrogen-heterocyclic compound, display panel and display apparatus

A nitrogen-heterocyclic compound, having a structure according to Chemical Formula 1:

• wherein
• X1 and X2 are each independently a carbon atom or a nitrogen atom, and at least one of X1 and X2 is N;
• X3 to X7 are each independently a nitrogen atom or —CRa, wherein one, two, three or four of X3 to X7 are a nitrogen atom, Ra is selected from a group consisting of hydrogen, deuterium, a substituted or unsubstituted C1-C20 alkyl, a substituted or unsubstituted C1-C20 alkoxy, a substituted or unsubstituted C1-C20 thioalkyl, a substituted or unsubstituted C6-C30 aryl, and a substituted or unsubstituted C3-C30 heteroaryl;
• and Ra is present independently or forms, with adjacent carbon atoms, an aliphatic ring, an aromatic ring, or a heteroaromatic ring;
• Ar1 and Ar2 are each independently selected from a group consisting of a substituted or unsubstituted C6-C30 aryl and a substituted or unsubstituted C3-C30 heteroaryl;
• and
• L1 and L2 are each independently selected from a group consisting of a single bond, a substituted or unsubstituted C6-C30 arylene, and a substituted or unsubstituted C3-C30 heteroarylene;
• m is a number of L1,
• n is a number of L2, and
• m and n are each an integer independently selected from 1, 2, and 3.