Polycyclic compound and organic electroluminescence device including the same

A polycyclic compound represented by the following Formula 5:

• in Formula 5,
• X2 is a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, or a substituted or unsubstituted silyl group,
• R12 to R15 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 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, and each Y is represented by the following Formula 6:
• in Formula 6,
• L3 is a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms,
• R16 to R23 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 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms.

An organic electroluminescence device, comprising:

• a first electrode;
• a hole transport region on the first electrode;
• an emission layer on the hole transport region;
• an electron transport region on the emission layer;
• and
• a second electrode on the electron transport region,
• wherein the emission layer includes a polycyclic compound represented by the following Formula 1:
• in Formula 1,
• X1 is a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, or a substituted or unsubstituted silyl group,
• R1 to R11 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 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms,
• L1 and L2 are each independently a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, and
• “n1” to “n4” are each independently an integer of 0 to 4.