A hetero-cyclic compound represented by the following Chemical Formula 1, or Compounds 14, 31, 32 or 33 shown below: in Chemical Formula 1, X1 to X3 are the same as or different from each other, and are each independently CR or N, Q is a substituted or unsubstituted monocyclic to tetracyclic ring, L is a direct bond; or a substituted or unsubstituted arylene having 6 to 30 carbon atoms, Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted phenyl group R and R1 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy group; a carbonyl group; an ester group; an imide group; an amino group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron 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 aralkyl group; a substituted or unsubstituted aralkenyl group; a substituted or unsubstituted alkylaryl group; a substituted or unsubstituted alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted arylheteroarylamine 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 hetero-cyclic group, or combine with an adjacent group to form a substituted or unsubstituted ring, a is an integer of 0 to 4, p is an integer of 0 to 5, and when a and p are each 2 or more, the structures in the parenthesis are the same as or different from each other; X1 to X3 are the same as or different from each other, and are each independently CR or N, Q is a substituted or unsubstituted monocyclic to tetracyclic ring, L is a direct bond; or a substituted or unsubstituted arylene having 6 to 30 carbon atoms, Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted phenyl group R and R1 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy group; a carbonyl group; an ester group; an imide group; an amino group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron 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 aralkyl group; a substituted or unsubstituted aralkenyl group; a substituted or unsubstituted alkylaryl group; a substituted or unsubstituted alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted arylheteroarylamine 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 hetero-cyclic group, or combine with an adjacent group to form a substituted or unsubstituted ring, a is an integer of 0 to 4, p is an integer of 0 to 5, and when a and p are each 2 or more, the structures in the parenthesis are the same as or different from each other;