Polycyclic compound and organic light-emitting device using same

A polycyclic compound represented by Formula I:

• wherein X is B, P═O, P═S or Al, Y1 and Y2 are each independently NR1, O, S, CRR2R3 or SiR4R5, and A1 to A3 are each independently selected from substituted or unsubstituted C5-C50 aromatic hydrocarbon rings, substituted or unsubstituted C2-C50 aromatic heterocyclic rings, substituted or unsubstituted C3-C30 aliphatic rings, and substituted or unsubstituted C3-C30 mixed aliphatic-aromatic rings, and comprising the structure represented by Structural Formula A:
• with the proviso that (i) at least one of A1 to A3 is optionally the structure represented by Structural Formula A or (ii) the polycyclic compound represented by Formula I is optionally substituted at least once with the structure represented by Structural Formula A, the structure represented by Structural Formula A is optionally substituted with one or more radicals R, R and R1 to R5 are the same as or different from each other and are each independently selected from hydrogen, deuterium, 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 C5-C30 arylthioxy, substituted or unsubstituted amine, substituted or unsubstituted silyl, substituted or unsubstituted C3-C30 mixed aliphatic-aromatic cyclic groups, nitro, cyano, and halogen, the substituents of each of the rings A1 to A3 are optionally linked to each other to form an alicyclic or aromatic monocyclic or polycyclic ring, each of R1 to R5 is optionally linked to an adjacent substituent of at least one of the rings A1 to A3 to form an alicyclic or aromatic monocyclic or polycyclic ring, the radicals R 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.