A compound represented by the following Chemical Formula 1: in Chemical Formula 1, A1 is a monocyclic or polycyclic heteroring substituted or unsubstituted, and including a 5-membered ring including O or S; R1 to R7, R' and R" are the same as or different from each other, and each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted haloalkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted haloalkoxy group; a substituted or unsubstituted alkylthioxy group; a substituted or unsubstituted aryloxy group; a substituted or unsubstituted arylthioxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted amine group; a substituted or unsubstituted arylalkyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted hydrocarbon ring group; or a substituted or unsubstituted heterocyclic group, or bond to adjacent groups to form a substituted or unsubstituted ring, and wherein "substituted or unsubstituted" means being substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; a cyano group; an alkyl group; a cycloalkyl group; an alkoxy group; an aryloxy group; an alkylthioxy group; an arylthioxy group; an alkenyl group; a haloalkyl group; a haloalkoxy group; an arylalkyl group; a silyl group; a boron group; an amine group; an aryl group; a fused ring group of aromatic hydrocarbon and aliphatic hydrocarbon; and a heterocyclic group, or being substituted with a substituent linking two or more substituents among the substituents illustrated above, or having no substituents. A1 is a monocyclic or polycyclic heteroring substituted or unsubstituted, and including a 5-membered ring including O or S; R1 to R7, R' and R" are the same as or different from each other, and each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted haloalkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted haloalkoxy group; a substituted or unsubstituted alkylthioxy group; a substituted or unsubstituted aryloxy group; a substituted or unsubstituted arylthioxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted amine group; a substituted or unsubstituted arylalkyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted hydrocarbon ring group; or a substituted or unsubstituted heterocyclic group, or bond to adjacent groups to form a substituted or unsubstituted ring, and wherein "substituted or unsubstituted" means being substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; a cyano group; an alkyl group; a cycloalkyl group; an alkoxy group; an aryloxy group; an alkylthioxy group; an arylthioxy group; an alkenyl group; a haloalkyl group; a haloalkoxy group; an arylalkyl group; a silyl group; a boron group; an amine group; an aryl group; a fused ring group of aromatic hydrocarbon and aliphatic hydrocarbon; and a heterocyclic group, or being substituted with a substituent linking two or more substituents among the substituents illustrated above, or having no substituents. <EOS>