A compound represented by Formula 1 below: In Formula 1 above, Z ring is a C 10 -C 20 aryl group, X is O or S, L 1 is selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, and a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, Ar 1 is selected from the group consisting of a C 6 -C 60 aryl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, a fluorenyl group, and a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, m, n and o are each an integer of 0 to 4, R 1, R 2 and R 3 are independently selected from the group consisting of hydrogen, deuterium, halogen, a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and -L'-N(R a)(R b), and each of R 1 s or R 2 s or R 3 S of any adjacent groups is optionally linked together to form at least one fused ring, L' is selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from O, N, S, Si, and P, R a and R b are independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from O, N, S, Si, and P, and with the proviso that, the aryl group, heterocyclic group, fluorenyl group, fused ring group, arylene group, and fluorenylen group are optionally substituted by one or more substituents selected from the group consisting of deuterium, halogen, a C 6 -C 20 aryl group, a C 6 -C 20 aryl group substituted by deuterium, a fluorenyl group, a C 2 -C 20 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, and a C 3 -C 20 cycloalkyl group. Z ring is a C 10 -C 20 aryl group, X is O or S, L 1 is selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, and a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, Ar 1 is selected from the group consisting of a C 6 -C 60 aryl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, a fluorenyl group, and a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, m, n and o are each an integer of 0 to 4, R 1, R 2 and R 3 are independently selected from the group consisting of hydrogen, deuterium, halogen, a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and -L'-N(R a)(R b), and each of R 1 s or R 2 s or R 3 S of any adjacent groups is optionally linked together to form at least one fused ring, L' is selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from O, N, S, Si, and P, R a and R b are independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a fused ring group of a C 3 -C 60 aliphatic ring and a C 6 -C 60 aromatic ring, and a C 2 -C 60 heterocyclic group containing at least one heteroatom selected from O, N, S, Si, and P, and with the proviso that, the aryl group, heterocyclic group, fluorenyl group, fused ring group, arylene group, and fluorenylen group are optionally substituted by one or more substituents selected from the group consisting of deuterium, halogen, a C 6 -C 20 aryl group, a C 6 -C 20 aryl group substituted by deuterium, a fluorenyl group, a C 2 -C 20 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P, and a C 3 -C 20 cycloalkyl group.