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

1 . A light emitting element comprising:

a first electrode;

a first hole transport region on the first electrode;

a first emission layer on the first hole transport region;

a first electron transport region on the first emission layer; and

a second electrode on the first electron transport region,

wherein the first 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,

R 1 to R 6 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 R 3 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,

wherein, when n is 1, Y is Si, each of R 2 and R 4 to R 6 is a hydrogen atom, and R 1 is an unsubstituted triphenylsilyl group, then R 3 is not a hydrogen atom, and

wherein, when n is 1 and Y is Si and R 1 is a phenyl group, then the phenyl group is unsubstituted:

wherein, in Formula H-1,

Ar 1 and Ar 2 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, and

Ar 3 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,

L 1 and L 2 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.

2 . The light emitting element of claim 1 , wherein R 3 is a hydrogen atom, a substituted or unsubstituted t-butyl group, a substituted or unsubstituted cycloalkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted adamantyl group.

3 . The light emitting element of claim 1 , wherein the polycyclic compound represented by Formula 1 is represented by Formula 2:

wherein, in Formula 2,

R 31 is a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms, and

in Formula 2, X, Y, R 1 , R 2 , R 4 to R 6 , n, m1, m2, and q1 to q3 are the same as defined in Formula 1.

4 . The light emitting element of claim 3 , wherein the polycyclic compound represented by Formula 2 is represented by Formula 2-1:

wherein, in Formula 2-1, X, Y, R 1 , R 2 , R 4 to R 6 , n, m1, m2, and q1 to q3 are the same as defined in Formula 1, and R 31 is the same as defined in Formula 2.

5 . The light emitting element of claim 3 , wherein R 31 is a hydrogen atom, a substituted or unsubstituted t-butyl group, a substituted or unsubstituted cyclohexyl group, or a substituted or unsubstituted adamantyl group.

6 . The light emitting element of claim 1 , wherein the polycyclic compound represented by Formula 1 is represented by Formula 3-1 or Formula 3-2:

wherein, in Formula 3-1 and Formula 3-2,

Z is C or Si,

R 11 and R 12 are each independently a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms,

R 7 to R 9 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,

m11 is an integer from 0 to 5 when m11+n is 5 or less,

m12 is an integer from 0 to 4 when m12+n is 4 or less,

r1 to r3 are each independently an integer from 0 to 5, and

in Formula 3-1 and Formula 3-2, X, Y, R 1 to R 6 , n, m2, p, and q1 to q3 are the same as defined in Formula 1.

7 . The light emitting element of claim 6 , wherein the polycyclic compound represented by Formula 1 is represented by any one selected from among Formula 4-1 to Formula 4-6:

wherein, in Formula 4-1 to Formula 4-6, X, R 2 to R 9 , n, m2, p, q1 to q3, and r1 to r3 are the same as defined in Formula 1, Formula 3-1, and Formula 3-2.

8 . The light emitting element of claim 7 , wherein each of R 2 to R 9 is a hydrogen atom.

9 . The light emitting element of claim 1 , wherein the polycyclic compound represented by Formula 1 is represented by one selected from among compounds in Compound Group 1:

10 . The light emitting element of claim 1 , wherein the first hole transport region comprises a hole injection layer on the first electrode, a hole transport layer on the hole injection layer, and an electron blocking layer on the hole transport layer, and

the hole transport layer comprises the polycyclic compound represented by Formula 1.

11 . The light emitting element of claim 10 , wherein the hole transport layer has a thickness of about 250 Å or more.

12 . The light emitting element of claim 10 , wherein the hole transport layer has a refractive index of less than about 1.8.

13 . The light emitting element of claim 1 , wherein the first emission layer is configured to emit light having a center wavelength of about 430 nm to about 470 nm.

14 . The light emitting element of claim 1 , further comprising:

a second hole transport region between the first electron transport region and the second electrode;

a second emission layer between the second hole transport region and the second electrode; and

a second electron transport region between the second emission layer and the second electrode,

wherein the second hole transport region comprises the polycyclic compound represented by Formula 1.

15 . The light emitting element of claim 14 , wherein the second hole transport region further comprises a compound represented by Formula H-1:

wherein, in Formula H-1,

Ar 1 and Ar 2 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,

Ar 3 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,

L 1 and L 2 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.

16 . A polycyclic compound represented by Formula 1:

wherein, in Formula 1,

X is a direct linkage,

Y is C or Si,

R 1 to R 6 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 R 3 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 R 2 and R 4 to R 6 is a hydrogen atom, and R 1 is an unsubstituted triphenylsilyl group, then R 3 is not a hydrogen atom, and

wherein, when n is 1 and Y is Si and R 1 is a phenyl group, then the phenyl group is unsubstituted.

17 . The polycyclic compound of claim 16 , wherein the polycyclic compound represented by Formula 1 has a refractive index of about 1.6 to about 1.76.

18 . The polycyclic compound of claim 16 , wherein the polycyclic compound represented by Formula 1 is represented by Formula 2:

wherein, in Formula 2,

R 31 is a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms, and

in Formula 2, X, Y, R 1 , R 2 , R 4 to R 6 , n, m1, m2, and q1 to q3 are the same as defined in Formula 1.

19 . The polycyclic compound of claim 16 , wherein the polycyclic compound represented by Formula 1 is represented by Formula 3-1 or Formula 3-2:

wherein, in Formula 3-1 and Formula 3-2,

Z is C or Si,

R 11 and R 12 are each independently a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms,

R 7 to R 9 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,

m11 is an integer from 0 to 5 when m11+n is 5 or less,

m12 is an integer from 0 to 4 when m12+n is 4 or less,

r1 to r3 are each independently an integer from 0 to 5, and

in Formula 3-1 and Formula 3-2, X, Y, R 1 to R 6 , n, m2, p, and q1 to q3 are the same as defined in Formula 1.

20 . 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,

R 1 to R 6 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 R 3 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 R 2 and R 4 to R 6 is a hydrogen atom, and R 1 is an unsubstituted triphenylsilyl group, then R 3 is not a hydrogen atom, and

wherein, when n is 1 and Y is Si and R 1 is a phenyl group, then the phenyl group is unsubstituted:

wherein, in Formula H-1,

Ar 1 and Ar 2 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,

Ar 3 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,

L 1 and L 2 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.

21 . The display device of claim 20 , wherein the hole transport region comprises a hole injection layer on the first electrode, a hole transport layer on the hole injection layer, and an electron blocking layer on the hole transport layer, and

the hole transport layer comprises the polycyclic compound represented by Formula 1.

22 . The display device of claim 21 , wherein the hole transport layer has a thickness of about 250 Å or more.

23 . The display device of claim 21 , wherein the hole transport layer has a refractive index of less than about 1.8.

24 . The display device of claim 21 , wherein at least one selected from among the plurality of light emitting elements is configured to emit light having a center wavelength of about 430 nm to about 470 nm.