Polycyclic compound and organic light emitting device using same

A polycyclic compound represented by Formula A-1:

• wherein X is selected from B, P═O, and P═S, each Z is independently N or CR, with the proviso that at least one of the moieties Z is CR, Y1 and Y2 are each independently selected from NR1, CR2R3, O, S, Se, and Si R4R5, Y3 is O or S, A1 and A2 are each independently selected from substituted or unsubstituted C6-C50 aromatic hydrocarbon rings and substituted or unsubstituted C2-C50 aromatic heterocyclic rings, R1 to R5 are the same as or different from each other and are each independently selected from hydrogen, deuterium (D), substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C50 aryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C3-C30 heterocycloalkyl, substituted or unsubstituted C2-C50 heteroaryl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthioxy, substituted or unsubstituted C6-C30 arylthioxy, substituted or unsubstituted amine, substituted or unsubstituted silyl, nitro, cyano, and halogen, provided that when both Y1 and Y2 are NR1 and at least one of the two groups R1 is heteroaryl, C12+ heteroaryl containing O or S as a heteroatom is excluded, with the proviso that each of R1 to R5 are optionally bonded to one or more of the rings A1 and A2 to form an alicyclic or aromatic monocyclic or polycyclic ring, and the groups R are the same as or different from each other and are each independently selected from hydrogen, substituted or unsubstituted C6-C50 aryl, substituted or unsubstituted C2-C50 heteroaryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C3-C30 heterocycloalkyl, and substituted or unsubstituted C3-C30 mixed aliphatic-aromatic rings, with the proviso that at least one of the groups R is an aryl, heteroaryl or mixed aliphatic-aromatic cyclic group substituted with at least one deuterium (D), the substituents of each of the rings A1 and A2 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring, R2 and R3 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring, and R4 and R5 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring.