A compound represented by the following Chemical Formula 1: wherein, in Chemical Formula 1, R is Si(R 1)(R 2)(R 3), R 1 to R 3 are each independently hydrogen; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 6-60 aryl; a (tri(C 1-60 alkyl)silyl)-(C 1-10 alkylene)-; or a (tri(C 6-60 aryl)silyl)-(C 1-10 alkylene)-, or R 1 and R 2 are linked together to form a ring, provided that the case wherein R 1 to R 3 are all a substituted or unsubstituted C 1-60 alkyl is excluded, a to c are each independently an integer of 0 to 4, R 4 to R 6 are each independently hydrogen; deuterium; a halogen; a cyano; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 1-60 alkoxy; a substituted or unsubstituted C 1-60 thioalkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 5-60 heteroaryl containing one or more heteroatoms selected from the group consisting of N, O, and S, L 1 is a single bond; or phenylene, L 2 is a single bond; or a substituted or unsubstituted C 6-60 arylene, and Ar is a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 5-60 heteroaryl containing one or more heteroatoms selected from the group consisting of N, O, and S, wherein the term "substituted" means substituted with one or more substituents selected from the group consisting of 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 phosphine oxide group; an alkoxy group; an aryloxy group; an alkylthioxy group; an arylthioxy group; an alkylsulfoxy group; an arylsulfoxy group; a silyl group; a boron group; an alkyl group; a cycloalkyl group; an alkenyl group; an aryl group; an aralkyl group; an aralkenyl group; an alkylaryl group; an alkylamine group; an aralkylamine group; a heteroarylamine group; an arylamine group; an arylphosphine group; and a heterocyclic group containing at least one of N, O, and S atoms, or being substituted with a substituent to which two or more substituents are linked among said substituents. R is Si(R 1)(R 2)(R 3), R 1 to R 3 are each independently hydrogen; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 6-60 aryl; a (tri(C 1-60 alkyl)silyl)-(C 1-10 alkylene)-; or a (tri(C 6-60 aryl)silyl)-(C 1-10 alkylene)-, or R 1 and R 2 are linked together to form a ring, provided that the case wherein R 1 to R 3 are all a substituted or unsubstituted C 1-60 alkyl is excluded, a to c are each independently an integer of 0 to 4, R 4 to R 6 are each independently hydrogen; deuterium; a halogen; a cyano; a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 1-60 alkoxy; a substituted or unsubstituted C 1-60 thioalkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 5-60 heteroaryl containing one or more heteroatoms selected from the group consisting of N, O, and S, L 1 is a single bond; or phenylene, L 2 is a single bond; or a substituted or unsubstituted C 6-60 arylene, and Ar is a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 5-60 heteroaryl containing one or more heteroatoms selected from the group consisting of N, O, and S, wherein the term "substituted" means substituted with one or more substituents selected from the group consisting of 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 phosphine oxide group; an alkoxy group; an aryloxy group; an alkylthioxy group; an arylthioxy group; an alkylsulfoxy group; an arylsulfoxy group; a silyl group; a boron group; an alkyl group; a cycloalkyl group; an alkenyl group; an aryl group; an aralkyl group; an aralkenyl group; an alkylaryl group; an alkylamine group; an aralkylamine group; a heteroarylamine group; an arylamine group; an arylphosphine group; and a heterocyclic group containing at least one of N, O, and S atoms, or being substituted with a substituent to which two or more substituents are linked among said substituents.