Light emitting device

A light emitting device, comprising:

• a first electrode;
• a second electrode facing the first electrode;
• and
• a plurality of organic layers between the first electrode and the second electrode,
• wherein at least one organic layer of the plurality of organic layers comprises a fused polycyclic compound, and
• the fused polycyclic compound is represented by Formula 1:
• wherein in Formula 1,
• X1 to X4 are each independently CR4R5, NR6, O, S or Se,
• Y1 and Y2 are each B,
• R1 to R6 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted carbonyl group, a substituted or unsubstituted alkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 60 ring-forming carbon atoms, and/or combined with an adjacent group to form a ring,
• “n1” and “n2” are each independently an integer of 0 to 3,
• “n3” is an integer of 0 to 2,
• Cy1 and Cy2 are each independently represented by Formula 2 or Formula 3, and
• Cy1 and/or Cy2 is represented by Formula 2:
• wherein in Formula 2,
• Z1 is CR8R9, NR10, O, S, or Se,
• R7 to R10 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted carbonyl group, a substituted or unsubstituted alkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 60 ring-forming carbon atoms, and/or combined with an adjacent group to form a ring,
• “n4” is an integer of 0 to 4, and
• represents a position connected with X1 or Y1, or a position connected with X4 or Y2,
• and
• wherein in Formula 3,
• R11 is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted carbonyl group, a substituted or unsubstituted alkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 60 ring-forming carbon atoms, and/or combined with an adjacent group to form a ring,
• “n5” is an integer of 0 to 4, and
• represents a position connected with X1 or Y1, or a position connected with X4 or Y2.