A hetero-cyclic compound represented by the following Chemical Formula 1: wherein, in Chemical Formula 1, L1 and L2 are the same as or different from each other, each independently a substituted or unsubstituted arylene group; or a substituted or unsubstituted alkenylene group; Ar1 is represented by any one of the following Chemical Formula 3 to Chemical Formula 10; wherein, in Chemical Formulae 3 to 10, a is an integer of 0 to 8; b is an integer of 0 to 7; c is an integer of 0 to 4; d is an integer of 0 to 5; e is an integer of 0 to 3; X7 is S, O, NR or CRR'; and R, R', and R1 to R14 are the same as or different from each other, each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy 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 alkylsulfoxide group; a substituted or unsubstituted arylsulfoxide 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 alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroring group including one or more of O, N and S as a heteroatom; X1 to X3 are the same as or different from each other, each independently a trivalent heteroatom or CH, and at least one of X1 to X3 is a trivalent heteroatom; and Ar2 and Ar3 are the same as or different from each other, each independently a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroring group including one or more of O, N and S as a heteroatom; characterized in that X is any one of the following structural formulae; L1 and L2 are the same as or different from each other, each independently a substituted or unsubstituted arylene group; or a substituted or unsubstituted alkenylene group; Ar1 is represented by any one of the following Chemical Formula 3 to Chemical Formula 10; a is an integer of 0 to 8; b is an integer of 0 to 7; c is an integer of 0 to 4; d is an integer of 0 to 5; e is an integer of 0 to 3; X7 is S, O, NR or CRR'; and R, R', and R1 to R14 are the same as or different from each other, each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy 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 alkylsulfoxide group; a substituted or unsubstituted arylsulfoxide 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 alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroring group including one or more of O, N and S as a heteroatom; X1 to X3 are the same as or different from each other, each independently a trivalent heteroatom or CH, and at least one of X1 to X3 is a trivalent heteroatom; and Ar2 and Ar3 are the same as or different from each other, each independently a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroring group including one or more of O, N and S as a heteroatom; characterized in that X is any one of the following structural formulae;