HETEROCYCLIC COMPOUND, ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME, AND ELECTRONIC APPARATUS INCLUDING THE ORGANIC LIGHT-EMITTING DEVICE

1 . A heterocyclic compound represented by Formula 1:

wherein, in Formula 1,

E 1 is a group represented by Formula A, and

k1 is an integer from 1 to 5,

in Formulae 1 and A,

n1 is 1,

n2 is 0,

R 1 to R 4 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 2 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q 1 )(Q 2 ), —Si(Q 3 )(Q 4 )(Q 5 ), —Ge(Q 3 )(Q 4 )(Q 5 ), —B(Q 6 )(Q 7 ), —P(═O)(Q 8 )(Q), or —P(Q 8 )(Q),

R 5 to R 7 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 2 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, —N(Q 1 )(Q 2 ), —Si(Q 3 )(Q 4 )(Q 5 ), —Ge(Q 3 )(Q 4 )(Q 5 ), —B(Q 6 )(Q 7 ), —P(═O)(Q 8 )(Q 9 ), or —P(Q 8 )(Q 9 ),

d1, d2, d3, d5, and d6 are each independently an integer from 0 to 4, d4 is an integer from 0 to 3,

d7 is an integer from 0 to 5,

the heterocyclic compound represented by Formula 1 comprises at least one deuterium, and

a moiety represented by

 in Formula 1 is a group represented by Formula 4-2 or 4-3

wherein, in Formulae 4-2 and 4-3,

E 11 is the same as described in connection with E 1 ,

R 51 to R 55 are each independently the same as described in connection with R 5 ,

* indicates a binding site to a neighboring atom,

at least one substituent of the substituted C 1 -C 60 alkyl group, the substituted C 2 -C 60 alkenyl group, the substituted C 2 -C 60 alkynyl group, the substituted C 1 -C 60 alkoxy group, the substituted C 3 -C 10 cycloalkyl group, the substituted C 1 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 2 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 6 -C 60 aryloxy group, the substituted C 6 -C 60 arylthio group, the substituted C 1 -C 60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is

deuterium, —F, —Cl, —Br, —I, -CD 3 , -CD 2 H, -CDH 2 , —CF 3 , —CF 2 H, —CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group;

a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group, each substituted with deuterium, —F, —Cl, —Br, —I, -CD 3 , -CD 2 H, -CDH 2 , —CF 3 , —CF 2 H, —CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 2 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q 11 )(Q 12 ), —Si(Q 13 )(Q 14 )(Q 15 ), —Ge(Q 13 )(Q 14 )(Q 15 ), —B(Q 16 )(Q 17 ), —P(═O)(Q 18 )(Q 19 ), —P(Q 18 )(Q 19 ), or any combination thereof;

a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 2 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each unsubstituted or substituted with at least one of deuterium, —F, —Cl, —Br, —I, -CD 3 , -CD 2 H, -CDH 2 , —CF 3 , —CF 2 H, —CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 2 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q 21 )(Q 22 ), —Si(Q 23 )(Q 24 )(Q 25 ), —Ge(Q 23 )(Q 24 )(Q 25 ), —B(Q 26 )(Q 27 ), —P(═O)(Q 28 )(Q 29 ), —P(Q 28 )(Q 29 ) or any combination thereof;

—N(Q 31 )(Q 32 ), —Si(Q 33 )(Q 34 )(Q 35 ), —Ge(Q 33 )(Q 34 )(Q 35 ), —B(Q 36 )(Q 37 ), —P(═O)(Q 38 )(Q 39 ), or —P(Q 38 )(Q 39 ); or

any combination thereof, and

Q 1 to Q 9 , Q 11 to Q 19 , Q 21 to Q 29 , and Q 31 to Q 39 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C 1 -C 60 alkyl group which is unsubstituted or substituted with deuterium, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or any combination thereof, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 2 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group which is unsubstituted or substituted with deuterium, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or any combination thereof, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group.

2 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound represented by Formula 1 satisfies at least one of Conditions 1 to 7:

Condition 1

d1 is at least 1, and at least one R 1 is deuterium;

Condition 2

d2 is at least 1 and at least one R 2 is deuterium;

Condition 3

n1 and d3 are each at least 1, and at least one R 3 is deuterium;

Condition 4

n1 and d4 are each as least one, and at least one R 4 is deuterium;

Condition 5

d5 is at least 1, and at least one R 5 is deuterium;

Condition 6

k1, n2, and d6 are each at least 1, and at least one R 6 is deuterium; and

Condition 7

k1 and d7 are each at least 1, and at least one R 7 is deuterium.

3 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound represented by Formula 1 satisfies at least one of Conditions 1′ to 7′:

Condition 1′

d1 is 4, and all R 1 (s) are deuterium;

Condition 2′

d2 is 4, and all R 2 (s) are deuterium;

Condition 3′

d3 is 4, and all R 3 (s) are deuterium;

Condition 4′

d4 is 3, and all R 4 (s) are deuterium;

Condition 5′

k1 is 1, d5 is 4, and all R 5 (s) are deuterium;

Condition 6′

d6 is 4, and all R 6 (s) are deuterium; and

Condition 7′

d7 is 4, and all R 7 (s) are deuterium.

4 . The heterocyclic compound of claim 1 , wherein a substitution ratio of deuterium in the heterocyclic compound represented by Formula 1 is greater than or equal to 10%, and wherein the substitution ratio is the ratio of the number of deuterium atoms in R 1 to R 7 to the total number hydrogen atoms and deuterium atoms in R 1 to R 7 .

5 . The heterocyclic compound of claim 1 , wherein a moiety represented by

 in Formula 1 is a group represented by one of Formulae 4-201 to 4-279 and 4-301 to 4-356:

wherein, in Formulae 4-201 to 4-279 and 4-301 to 4-356,

D is a deuterium atom, and

* indicates a binding site to a neighboring atom.

6 . The heterocyclic compound of claim 1 , wherein a moiety represented by

 in Formula 1 is a group represented by one of Formulae 2-1 to 2-4:

wherein, in Formulae 2-1 to 2-4,

R 3 , R 4 , d3, and d4 are each the same as defined for claim 1 , and

* and *′ each indicate a binding site to a neighboring atom.

7 . The heterocyclic compound of claim 1 , wherein a moiety represented by

 in Formula 1 is a group represented by one of Formulae 3-1 to 3-4:

wherein, in Formulae 3-1 to 3-4,

R 11 to R 14 are each the same as defined for R 1 in claim 1 ,

R 21 to R 24 are each the same as defined for R 2 in claim 1 ,

R 31 to R 34 are each the same as defined for R 3 in claim 1 ,

R 41 to R 44 are each the same as defined for R 4 in claim 1 , and

* indicates a binding site to a neighboring atom.

8 . The heterocyclic compound of claim 7 , wherein the group represented by one of Formulae 3-1 to 3-4 satisfies one of Conditions 8-1 to 8-4:

Condition 8-1

at least one of R 11 to R 14 is deuterium;

Condition 8-2

at least one of R 21 to R 24 is deuterium;

Condition 8-3

at least one of R 31 to R 34 is deuterium; and

Condition 8-4

at least one of R 41 to R 44 is deuterium.

9 . The heterocyclic compound of claim 1 , wherein a moiety represented by

 in Formula 1 is a group represented by one of Formulae 3-101 to 3-112, 3-201 to 3-212, 3-301 to 3-312, and 3-401 to 3-412:

wherein, in Formulae 3-101 to 3-112, 3-201 to 3-212, 3-301 to 3-312, and 3-401 to 3-412,

D is a deuterium atom, and

* indicates a binding site to a neighboring atom.

10 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound represented by Formula 1 is represented by Formula 1-1 or 1-2:

wherein, in Formulae 1-1 and 1-2,

R 1 to R 5 are each the same as defined for claim 1 ,

d75 is an integer from 0 to 5,

d14, d24, d34, and d54 are each independently an integer from 0 to 4,

d43 is an integer from 0 to 3, and

the heterocyclic compounds represented by Formulae 1-1 and 1-2 each comprise at least one deuterium.

11 . The heterocyclic compound of claim 1 , wherein

R 1 and R 2 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 2 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, —N(Q 1 )(Q 2 ), —Si(Q 3 )(Q 4 )(Q 5 ), —Ge(Q 3 )(Q 4 )(Q 5 ), —B(Q 6 )(Q 7 ), —P(═O)(Q 8 )(Q 9 ), or —P(Q 8 )(Q), and

Q 1 to Q 9 are each the same as defined for claim 1 .

12 . An organic light-emitting device comprising:

a first electrode,

a second electrode, and

an organic layer arranged between the first electrode and the second electrode and comprising an emission layer,

wherein the organic layer comprises at least one heterocyclic compound of claim 1 .

13 . The organic light-emitting device of claim 12 , wherein

the organic layer further comprises a hole transport region between the first electrode and the emission layer and an electron transport region between the emission layer and the second electrode,

the hole transport region comprises a hole injection layer, a hole transport layer, an electron blocking layer, an auxiliary layer, or any combination thereof, and

the electron transport region comprises a buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

14 . The organic light-emitting device of claim 12 , wherein the emission layer comprises the heterocyclic compound.

15 . The organic light-emitting device of claim 13 , wherein the hole transport region comprises the heterocyclic compound.

16 . The organic light-emitting device of claim 13 , wherein the electron transport region comprises the heterocyclic compound.

17 . The organic light-emitting device of claim 14 , wherein the emission layer further comprises a phosphorescent dopant.

18 . The organic light-emitting device of claim 17 , wherein the emission layer further comprises a fluorescent dopant.

19 . The organic light-emitting device of claim 14 , wherein the emission layer further comprises an electron-transporting host.

20 . An electronic apparatus comprising the organic light-emitting device of claim 12 .