Polycyclic compound, light emitting element including the same, and display device including the same

A polycyclic compound represented by Formula 1:

• wherein, in Formula 1,
• X is a direct linkage,
• Y is C or Si,
• R1 to R6 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine 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, and/or are bonded to an adjacent group to form a ring,
• at least one R3 is a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms,
• n is 0 or 1,
• m1 is an integer from 0 to 5 when m1+n is 5 or less,
• m2 is an integer from 0 to 4 when m2+n is 4 or less,
• p is an integer from 0 to 5, and
• q1 to q3 are each independently an integer from 0 to 5, and
• wherein, when n is 1, Y is Si, each of R2 and R4 to R6 is a hydrogen atom, and R1 is an unsubstituted triphenylsilyl group, then R3 is not a hydrogen atom, and
• wherein, when n is 1 and Y is Si and R1 is a phenyl group, then the phenyl group is unsubstituted.

A display device comprising a plurality of light emitting elements, wherein each of the plurality of light emitting elements comprises:

• 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 hole transport region comprises a polycyclic compound represented by Formula 1 and a compound represented by Formula H-1:
• wherein, in Formula 1,
• X is a direct linkage,
• Y is C or Si,
• R1 to R6 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine 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, and/or are bonded to an adjacent group to form a ring,
• at least one R3 is a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms,
• n is 0 or 1,
• m1 is an integer from 0 to 5 when m1+n is 5 or less,
• m2 is an integer from 0 to 4 when m2+n is 4 or less,
• p is an integer from 0 to 5,
• q1 to q3 are each independently an integer from 0 to 5, and
• wherein, when n is 1, Y is Si, each of R2 and R4 to R6 is a hydrogen atom, and R1 is an unsubstituted triphenylsilyl group, then R3 is not a hydrogen atom, and
• wherein, when n is 1 and Y is Si and R1 is a phenyl group, then the phenyl group is unsubstituted:
• wherein, in Formula H-1,
• Ar1 and Ar2 are each independently 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,
• Ar3 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,
• L1 and L2 are each independently 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
• a and b are each independently an integer from 0 to 10.