Light emitting element and polycyclic compound for the same

A light emitting element 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 polycyclic compound represented by Formula 1:
• and
• wherein in Formula 1,
• X1 and X2 are each independently O, S, Se, CRaRb, SiRcRa, or NR12, and X1 and X2 are not both O,
• at least one selected from among R1 to R12 is an N-containing tricyclic heteroaryl group, and the remainder are each independently hydrogen, deuterium, a halogen, a cyano group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 ring-forming 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,
• the N-containing tricyclic heteroaryl group is substituted with at least one substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms,
• when the at least one substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms is a crosslinked cycloalkyl group, each of a plurality of rings in the crosslinked cycloalkyl group has 5 to 30 ring-forming carbon atoms,
• Ra to Ra are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, and
• Formula 1 comprises a structure in which one or more hydrogens are substituted with deuterium.

A polycyclic compound represented by Formula 1:

• wherein in Formula 1,
• X1 and X2 are each independently O, S, Se, CRaRb, SiRcRd, or NR12, and X1 and X2 are not both O,
• Ra to Rd are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, and
• at least one selected from among R1 to R12 is represented by Formula 2, and the remainder are each independently hydrogen, deuterium, a halogen, a cyano group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 ring-forming 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
• wherein in Formula 2,
• L is a direct linkage or a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms,
• Y is a direct linkage, O, S, Se, CReRf, SiRgRn, or NRi,
• Re to Ri are each independently a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,
• at least one selected from among R14 to R19 is a substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms, and the remainder are each independently hydrogen or deuterium,
• when R14 to R19 are a crosslinked cycloalkyl group, each of a plurality of rings in the crosslinked cycloalkyl group has 5 to 10 ring-forming carbon atoms,
• R13 and R20 are each independently hydrogen, deuterium, or a substituted or unsubstituted cycloalkyl group having 3 to 30 ring-forming carbon atoms, and
• Formula 1 comprises a structure in which one or more hydrogens are substituted with deuterium.