Fused polycyclic compound and light emitting device including the same

A light emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• and
• an emission layer between the first electrode and the second electrode,
• wherein the emission layer comprises a host and a dopant, and
• wherein the host comprises a compound represented by Formula E-2a or Formula E-2b, and
• the dopant comprises a fused polycyclic compound represented by Formula 1:
• wherein, in Formula 1,
• C1, C2, C4, and C5 are each independently a monocyclic aromatic hydrocarbon ring having 6 ring-forming carbon atoms, or a monocyclic aromatic heterocycle having 2 to 5 ring-forming carbon atoms,
• C3 is a monocyclic aromatic hydrocarbon ring having 6 ring-forming carbon atoms, or a monocyclic aromatic heterocycle having 3 to 5 ring-forming carbon atoms,
• R1 to R5 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted boron group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or are bonded to an adjacent group to form a ring, or a substituent represented by Formula 2, or a substituent represented by Formula 3,
• R1 to R3 are all represented by Formula 2, or at least one selected from among R1 to R5 is represented by Formula 3,
• n1 and n5 are each independently an integer of 1 to 4,
• n2 and n4 are each independently an integer of 1 to 5, and
• n3 is an integer of 1 to 3,
• wherein, in Formula 2,
• A1 and A2 are each independently an alkyl group having 1 to 20 carbon atoms, and
• Ra1 to Ra3 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms,
• wherein, in Formula 3,
• a is 0 or 1,
• when a is 1, Y is a direct linkage,
• Z1 and Z2 are each independently represented by Formula 2,
• R6 and R7 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and
• n6 and n7 are each independently an integer of 0 to 4,
• wherein, in Formula E-2a,
• b is an integer of 0 to 10,
• La is a direct linkage, a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms,
• Aa to Ae are each independently N or CRi,
• Ra to Ri are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted amine group, a substituted or unsubstituted thio group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or are bonded to an adjacent group to form a ring, and
• two or three selected from among Aa to Ae are N, and the others are CRi, and
• wherein, in Formula E-2b,
• Cbz1 and Cbz2 are each independently an unsubstituted carbazole group, or a carbazole group substituted with an aryl group having 6 to 30 ring-forming carbon atoms,
• Lb is a direct linkage, a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms, and
• c is an integer of 0 to 10.