Heterocyclic compound and organic light-emitting device including the same

1. A heterocyclic compound represented by Formula 2a or 2b:

wherein:

X 1 is an oxygen atom (—O—) or a sulfur atom (—S—); and

R 1 to R 8 are each independently one of a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, an amino group, a nitro group, a carboxyl group, a substituted or unsubstituted C 3 -C 30 alkynyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 6 -C 30 arylthio group, a substituted or unsubstituted C 2 -C 30 heteroaryl group, or a —N(Q 1 )(Q 2 ) group,

wherein at least one of R1 or R2, at least one of R3 or R4, at least one of R5 or R6, and at least one of R7 or R8 are independently one of a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a carboxyl group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 6 -C 30 arylthio group, a substituted or unsubstituted C 2 -C 30 heteroaryl group, or a —N(Q 1 )(Q 2 ) group,

wherein at least one of R 2 or R 3 is independently one of a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a carboxyl group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 6 -C 30 arylthio group, a substituted or unsubstituted C 2 -C 30 heteroaryl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted chrysenyl group, a substituted or unsubstituted naphthacenyl group, a substituted or unsubstituted fluorenyl group, or N(Q 1 )(Q 2 ) group,

wherein Q 1 and Q 2 are each independently one of a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, an amino group, a nitro group, a carboxyl group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 6 -C 30 arylthio group, or a substituted or unsubstituted C 2 -C 30 heteroaryl group, and

wherein rings A 1 and rings B 1 are each independently one of a substituted or unsubstituted C 6 -C 30 aromatic ring or a substituted or unsubstituted C 2 -C 30 heteroaromatic ring.

2. The heterocyclic compound of claim 1 , wherein the rings A 1 and the rings B 1 are each independently one of a substituted or unsubstituted benzene ring, a substituted or unsubstituted anthracene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted pyridine ring, a substituted or unsubstituted carbazole ring, a substituted or unsubstituted thiophene ring, a substituted or unsubstituted dibenzothiophene ring, or a substituted or unsubstituted dibenzofuran ring.

3. The heterocyclic compound of claim 1 , wherein the rings A 1 and the rings B 1 are each independently a group represented by one of Formulae 3a to 3f:

wherein:

Z 1 to Z 4 are each independently one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group;

p and q are each independently an integer of from 2 to 4; and

* indicates a binding site of the ring A 1 or ring B 1 to the heterocyclic compound.

4. The heterocyclic compound of claim 1 , wherein the rings A 1 and the rings B 1 are each independently a group represented by one of Formulae 4a to 4f:

wherein * indicates a binding site of the ring A 1 or ring B 1 to the heterocyclic compound.

5. The heterocyclic compound of claim 1 , wherein R 1 to R 8 are each independently one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted chrysenyl group, a substituted or unsubstituted naphthacenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted bipyridinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, or a group represented by -ph-N(Q 3 )(Q 4 ),

wherein at least one of R1 or R2, at least one of R3 or R4, at least one of R5 or R6, and at least one of R7 or R8 are each independently one of a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted chrysenyl group, a substituted or unsubstituted naphthacenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted bipyridinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, or a group represented by -ph-N(Q 3 )(Q 4 ),

wherein Q 3 and Q 4 are each independently one of a substituted or unsubstituted C 6 -C 30 aryl group or a substituted or unsubstituted C 2 -C 30 heteroaryl group.

6. The heterocyclic compound of claim 1 , wherein R 1 , R 4 , R 5 and R 8 are each independently one of a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, or a group represented by -ph-N(ph)(ph); and

R 2 , R 3 , R 6 and R 7 are each independently a hydrogen atom or a deuterium atom.

7. The heterocyclic compound of claim 6 , wherein R 1 , R 4 , R 5 and R 8 are each independently a group represented by one of Formulae 5a to 5g:

wherein:

Z 11 to Z 13 are each independently one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted methoxy group, a substituted or unsubstituted ethoxy group, a substituted or unsubstituted propoxy group, a substituted or unsubstituted butoxy group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group;

r, s, and t are each independently an integer from 1 to 5; and

* indicates a binding site of R 1 , R 4 , R 5 and R 8 to the heterocyclic compound.

8. The heterocyclic compound of claim 6 , wherein R 1 , R 4 , R 5 and R 8 are each independently a group represented by one of Formulae 6a to 6g:

wherein * indicates a binding site of R 1 , R 4 , R 5 and R 8 to the heterocyclic compound.

9. The heterocyclic compound of claim 1 , wherein the heterocyclic compound is one of Compounds 1 to 168:

10. An organic light-emitting device comprising a first electrode, a second electrode facing the first electrode, and an organic layer between the first electrode and the second electrode, the organic layer comprising the heterocyclic compound of claim 1 .

11. The organic light-emitting device of claim 10 , wherein the organic layer comprises at least one of a hole injection layer, a hole transport layer, a functional layer having both hole injection and hole transport capabilities, a buffer layer, an emission layer, a hole blocking layer, an electron transport layer, an electron injection layer, and/or a functional layer having both electron injection and electron transport capabilities.

12. The organic light-emitting device of claim 10 , wherein the organic layer comprises at least one of a hole injection layer, a hole transport layer, and/or a functional layer having both hole injection and hole transport capabilities, and at least one of the hole injection layer, the hole transport layer, and/or the functional layer having both hole injection and hole transport capabilities comprises the heterocyclic compound.

13. The organic light-emitting device of claim 12 , wherein at least one of the hole injection layer, the hole transport layer, and/or the functional layer having both hole injection and hole transport capabilities further comprises a charge-generating material, and the charge-generating material is at least one of a quinone derivative, a metal oxide, and/or a cyano group-containing compound.

14. The organic light-emitting device of claim 10 , wherein the organic layer comprises at least one of an electron injection layer, an electron transport layer, and/or a functional layer having both electron injection and electron transport capabilities, and at least one of the electron injection layer, the electron transport layer, and/or the functional layer having both electron injection and electron transport capabilities comprises the heterocyclic compound.

15. The organic light-emitting device of claim 10 , wherein the organic layer comprises an emission layer, and the emission layer comprises the heterocyclic compound.

16. The organic light-emitting device of claim 15 , wherein the heterocyclic compound is a fluorescent or phosphorescent host.

17. The organic light-emitting device of claim 15 , wherein the heterocyclic compound is a fluorescent dopant.

18. The organic light-emitting device of claim 10 , wherein the organic layer comprises at least one of an emission layer, an electron injection layer, an electron transport layer, and/or a functional layer having both electron injection and electron transport capabilities, wherein at least one of the electron injection layer, the electron transport layer, and/or the functional layer having both electron injection and electron transport capabilities comprises the heterocyclic compound; and the emission layer comprises an arylamine compound.

19. An organic light-emitting display apparatus comprising: a transistor comprising a source, a drain, a gate, and an active layer; and the organic light-emitting device according to claim 10 , wherein one of the source and the drain of the transistor is electrically connected to the first electrode of the organic light-emitting device.