HETEROCYCLIC COMPOUND, ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME, AND DIAGNOSTIC COMPOSITION INCLUDING THE HETEROCYCLIC COMPOUND

1 . A heterocyclic compound represented by Formula 1:

wherein, in Formulae 1 and 2,

Y 1 is B, N, P, P(═O), or P(═S),

X 1 and X 2 are each independently a single bond, O, S, Se, N[(CY 5 )—Ar 2 ], N(R 1 ), C(R 1 )(R 2 ), S 1 (R 1 )(R 2 ), Ge(R 1 )(R 2 ), B(R 1 ), P(R 1 ), P(═O)(R 1 ), S(═O) 2 , or C(═O),

k1 is 0 or 1,

k2 is 0 or 1,

the sum of k1 and k2 is greater than or equal to 1,

CY 1 to CY 3 are each independently a C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group,

CY 4 and CY 5 are each independently a C 5 -C 30 carbocyclic group that is unsubstituted or substituted with at least one R 40 or a C 1 -C 30 heterocyclic group that is unsubstituted or substituted with at least one R 40 ,

Ar 1 and Ar 2 are each independently a group represented by Formula 2,

L 1 is a single bond, a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group,

a1 is 1, 2, or 3,

CY 10 is a C 3 -C 10 non-aromatic carbocyclic group or a C 1 -C 10 non-aromatic heterocyclic group,

R 1 , R 2 , R 10 , R 20 , R 30 , and R 40 are each independently a group represented by Formula 2, hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono 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 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl 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 C 2 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio 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 ), —S 1 (Q 1 )(Q 2 )(Q 3 ), —Ge(Q 1 )(Q 2 )(Q 3 ), —C(═O)(Q 1 ), —S(═O)(Q 1 ), —S(═O) 2 (Q 1 ), —B(Q 1 )(Q 2 ), —P(Q 1 )(Q 2 ), —P(═O)(Q 1 )(Q 2 ), —P(═S)(Q 1 )(Q 2 ), or a group represented by Formula 3,

R 50 and R 60 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono 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 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl 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 C 2 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio 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 ), —S 1 (Q 1 )(Q 2 )(Q 3 ), —Ge(Q 1 )(Q 2 )(Q 3 ), —C(═O)(Q 1 ), —S(═O)(Q 1 ), —S(═O) 2 (Q 1 ), —B(Q 1 )(Q 2 ), —P(Q 1 )(Q 2 ), —P(═O)(Q 1 )(Q 2 ), —P(═S)(Q 1 )(Q 2 ), or a group represented by Formula 3,

wherein, in Formula 3

X 31 is a single bond, O, S, N(R 301 ), or C(R 301 )(R 302 ),

k31 is 0 or 1,

CY 31 and CY 32 are each independently a C 5 -C 30 carbocyclic group or a C 1 -C 30 heterocyclic group,

L 30 is a single bond, a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group,

a30 is 0, 1, 2, or 3,

R 301 , R 302 , R 310 , and R 320 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono 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 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl 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 C 2 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio 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 ), —S 1 (Q 1 )(Q 2 )(Q 3 ), —Ge(Q 1 )(Q 2 )(Q 3 ), —C(═O)(Q 1 ), —S(═O)(Q 1 ), —S(═O) 2 (Q 1 ), —B(Q 1 )(Q 2 ), —P(Q 1 )(Q 2 ), —P(═O)(Q 1 )(Q 2 ), or —P(═S)(Q 1 )(Q 2 ),

b310 and b320 are each independently 1, 2, 3, 4, 5, 6, 7, or 8,

b10, b20, b30, b40, and b60 are each independently 1, 2, 3, 4, 5, 6, 7, or 8,

b50 is 1, 2, or 3,

a substituent of the substituted C 5 -C 30 carbocyclic group, the substituted C 1 -C 30 heterocyclic group, 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 1 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 7 -C 60 alkylaryl 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 C 2 -C 60 alkylheteroaryl group, the substituted C 1 -C 60 heteroaryloxy group, the substituted C 1 -C 60 heteroarylthio 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 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, 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid 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 1 -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 ), —S 1 (Q 11 )(Q 12 )(Q 13 ), —Ge(Q 11 )(Q 12 )(Q 13 ), —C(═O)(Q 11 ), —S(═O)(Q 11 ), —S(═O) 2 (Q 11 ), —B(Q 11 )(Q 12 ), —P(Q 11 )(Q 12 ), —P(═O)(Q 11 )(Q 12 ), —P(═S)(Q 11 )(Q 12 ), 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 1 -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 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 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, 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 1 -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 ), —S 1 (Q 21 )(Q 22 )(Q 23 ), —Ge(Q 21 )(Q 22 )(Q 23 ), —C(═O)(Q 21 ), —S(═O)(Q 21 ), —S(═O) 2 (Q 21 ), —B(Q 21 )(Q 22 ), —P(Q 21 )(Q 22 ), —P(═O)(Q 21 )(Q 22 ), —P(═S)(Q 21 )(Q 22 ), or any combination thereof;

—N(Q 31 )(Q 32 ), —S 1 (Q 31 )(Q 32 )(Q 33 ), —Ge(Q 31 )(Q 32 )(Q 33 ), —C(═O)(Q 31 ), —S(═O)(Q 31 ), —S(═O) 2 (Q 31 ), —B(Q 31 )(Q 32 ), —P(Q 31 )(Q 32 ), —P(═O)(Q 31 )(Q 32 ), or —P(Q 31 )(Q 32 );

Q 1 to Q 3 , Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 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 that 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 1 -C 10 heterocycloalkenyl group; a C 6 -C 60 aryl group that 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, and

* indicates a binding site to a neighboring atom.

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

wherein, in Formulae 1A and 1B,

X 11 is a single bond, O, S, Se, N(R 1 ), C(R 1 )(R 2 ), S 1 (R 1 )(R 2 ), Ge(R 1 )(R 2 ), B(R 1 ), P(R 1 ), P(═O)(R 1 ), S(═O) 2 , or C(═O).

3 . The heterocyclic compound of claim 1 , wherein CY 1 to CY 3 are each independently a C 6 -C 30 aromatic carbocyclic group or a C 1 -C 30 aromatic heterocyclic group.

4 . The heterocyclic compound of claim 1 , wherein CY 4 and CY 5 are each independently represented by one of Formulae 4-1 to 4-3:

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

R 41 to R 44 are each independently the same as described in connection with R 40 in claim 1 , and

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

5 . The heterocyclic compound of claim 1 , wherein CY 10 is a cyclopentane group, a cyclohexane group, a cycloheptane group, a cyclopentene group, a cyclohexene group, or a cycloheptene group.

6 . The heterocyclic compound of claim 1 , wherein Ar 1 and Ar 2 are each independently a group represented by Formula 2A or 2B:

wherein, in Formulae 2A and 2B,

* indicates a binding site to a neighboring atom.

7 . The heterocyclic compound of claim 1 , wherein Ar 1 and Ar 2 are each independently a group represented by one of Formulae 5-1 to 5-4:

wherein, in Formulae 5-1 to 5-4,

R 51 to R 53 are each the same as described in connection with R 50 in claim 1 ,

R 61 to R 68 are each the same as described in connection with R 60 in claim 1 , and

* indicates a binding site to a neighboring atom.

8 . The heterocyclic compound of claim 1 , wherein at least one of R 10 , at least one of R 20 , and/or at least one of R 30 is a group represented by Formula 3.

9 . The heterocyclic compound of claim 1 , wherein a group represented by Formula 3 is a group represented by one of Formulae 3-1 to 3-3:

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

X 301 is the same as described in connection with X 31 in claim 1 ,

X 311 is C(R 311 ) or N, X 312 is C(R 312 ) or N, X 313 is C(R 313 ) or N, X 314 is C(R 314 ) or N,

X 321 is C(R 321 ) or N, X 322 is C(R 322 ) or N, X 323 is C(R 323 ) or N, X 324 is C(R 324 ) or N,

R 311 to R 314 are each independently the same as described in connection with R 310 in claim 1 ,

R 321 to R 324 are each independently the same as described in connection with R 320 in claim 1 , and

* indicates a binding site to a neighboring atom.

10 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound is represented by one of Formulae 11-1 to 11-9:

wherein, in Formulae 11-1 to 11-9,

X 11 is a single bond, O, S, Se, N(R 1 ), C(R 1 )(R 2 ), S 1 (R 1 )(R 2 ), Ge(R 1 )(R 2 ), B(R 1 ), P(R 1 ), P(═O)(R 1 ), S(═O) 2 , or C(═O),

R 11 to R 14 are each independently the same as described in connection with R 10 in claim 1 ,

R 21 to R 24 are each independently the same as described in connection with R 20 in claim 1 ,

R 31 to R 33 are each independently the same as described in connection with R 30 in claim 1 , and

R 411 to R 414 and R 421 to R 424 are each independently the same as described in connection with R 40 in claim 1 .

11 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound has a symmetric structure or an asymmetric structure.

12 . The heterocyclic compound of claim 1 , wherein the heterocyclic compound is one of Compounds 1 to 792:

13 . 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 the heterocyclic compound of claim 1 .

14 . The organic light-emitting device of claim 13 , wherein the emission layer comprises the heterocyclic compound.

15 . The organic light-emitting device of claim 14 , wherein the emission layer comprises a host and an emitter, and

the emitter comprises the heterocyclic compound.

16 . The organic light-emitting device of claim 15 , wherein an amount of the host is greater than an amount of the heterocyclic compound.

17 . The organic light-emitting device of claim 15 , wherein the emission layer further comprises a sensitizer.

18 . The organic light-emitting device of claim 17 , wherein the sensitizer comprises a phosphorescent compound, a delayed fluorescence compound, or any combination thereof.

19 . The organic light-emitting device of claim 14 , wherein the emission layer emits blue light having a maximum emission wavelength of about 400 nm to about 490 nm.

20 . A diagnostic composition comprising the heterocyclic compound of claim 1 .