Light emitting device and polycyclic compound for the same

A light emitting device, comprising:

• a first electrode;
• a second electrode disposed on the first electrode;
• and
• an emission layer disposed between the first electrode and the second electrode and comprising a polycyclic compound represented by Formula 1:
• wherein in Formula 1,
• at least one of A1 and A2 is a group represented by
• and the remainder of A1 and A2 is a direct linkage, C(R21)(R22), B(R23), N(R24), Si(R25)(R26), P(R27), O, S, SO, SO2, or CO,
• X1 is O, S, SO, or SO2,
• Y1 is CO(R28) or R29,
• R1 to R11 and R21 to R28 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or are combined with an adjacent group to form a ring, and
• R29 is a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or is combined with an adjacent group to form a ring.