Organic light-emitting device

1. An organic light-emitting device, comprising:

an anode;

a cathode; and

an organic layer between the anode and the cathode, the organic layer including:

an emission layer including a dopant,

a hole transport region between the anode and the emission layer,

an electron transport region between the emission layer and the cathode, and

a buffer layer between the emission layer and the electron transport region,

wherein:

the buffer layer includes a compound of Formula 1 and a compound of Formula 2:

wherein, in Formula 1,

A 1 and A 2 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 2 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent nonaromatic condensed heteropolycyclic group;

X 1 and X 2 are each independently selected from a single bond, a substituted or unsubstituted C 6 -C 60 arylene group, a substituted or unsubstituted C 2 -C 60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent nonaromatic condensed heteropolycyclic group;

Y 1 to Y 4 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone, 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 2 -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 2 -C 60 heteroaryl group, a substituted or unsubstituted monovalent nonaromatic condensed polycyclic group, a substituted or unsubstituted monovalent nonaromatic condensed heteropolycyclic group, —N(Q 1 )(Q 2 ), —Si(Q 3 )(Q 4 )(Q 5 ), and —B(Q 6 )(Q 7 ), wherein Y 1 to Y 4 are separate or adjacent groups of Y 1 to Y 4 are linked to one another to form a ring;

p and s are each independently an integer of 1 to 4;

q and r are each independently an integer of 1 to 3;

when p is 2 or greater, a plurality of Y 1 s are identical or different, when q is 2 or greater, a plurality of Y 2 s are identical or different, when r is 2 or greater, a plurality of Y 3 s are identical or different, or when s is 2 or greater, a plurality of Y 4 s are identical or different;

wherein at least one substituent of the substituted C 6 -C 60 arylene group, the substituted C 2 -C 60 heteroarylene group, the substituted divalent nonaromatic condensed polycyclic group, the substituted divalent nonaromatic condensed heteropolycyclic 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 2 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 2 -C 10 heterocyclolalkenyl 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 2 -C 60 heteroaryl group, the substituted monovalent nonaromatic condensed polycyclic group, and the substituted monovalent nonaromatic condensed heteropolycyclic group is selected from:

a deuterium, —F, —Cl, —Br, —I, 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 phoshoric 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, and 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, and a C 1 -C 60 alkoxy group, each substituted with at least one of a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, a monovalent nonaromatic condensed heteropolycyclic group, —N(Q 11 )(Q 12 ), —Si(Q 13 )(Q 4 )(Q 15 ), and —B(Q 16 )(Q 17 );

a C 3 -C 10 cycloalkyl group, a C 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent nonaromatic condensed heteropolycyclic group;

a C 3 -C 10 cycloalkyl group, a C 2 -C 10 to 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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent nonaromatic condensed heteropolycyclic group, each substituted with at least one of a deuterium atom, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, a monovalent nonaromatic condensed heteropolycyclic group, —N(Q 21 )(Q 22 ), —Si(Q 23 )(Q 24 )(Q 25 ), and —B(Q 26 )(Q 27 ); and

—N(Q 31 )(Q 32 ), —Si(Q 33 )(Q 34 )(Q 35 ), and —B(Q 36 )(Q 37 ),

wherein Q 1 to Q 7 , Q 11 to Q 17 , Q 21 to Q 27 , and Q 31 to Q 37 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent aromatic condensed heteropolycyclic group,

wherein, in Formula 2,

A 11 , A 22 , and A 33 are each independently selected from hydrogen, deuterium, and a group represented by one of Formulae 2a, 2b, 2e, 2j to 2l, 2o to 2r and 2w, at least one of A 11 , A 22 , and A 33 being a group represented by one of Formulae 2a, 2b, 2e, 2j to 2l, 2o to 2r and 2w:

wherein, in Formulae 2a, 2b, 2e, 2j to 2l, 2o to 2r and 2w, Z 1 is selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone, 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 20 alkyl group, a C 6 -C 20 aryl group, a C 2 -C 20 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, a monovalent nonaromatic condensed heteropolycyclic group, —N(Q 11 )(Q 12 ), and —Si(Q 13 )(Q 14 )(Q 15 );

a is an integer of 1 to 9; and

when a is 2 or greater, a plurality of Z 1 s are identical or different, and

* indicates a binding site with an adjacent atom;

X 11 , X 22 , and X 33 are each independently a group represented by one or more of Formulae 3a, 3b, 3g, 3h, 3j to 3l and 3r:

wherein, in Formulae 3a, 3b, 3g, 3h, 3j to 3l and 3r,

R 12 is selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone, 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 20 alkyl group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group, a substituted or unsubstituted monovalent nonaromatic condensed polycyclic group, and a substituted or unsubstituted monovalent nonaromatic condensed heteropolycyclic group; and

* indicates a binding site with an adjacent atom;

i, j, and k are each independently an integer of 1 to 4;

l, m, and n are each independently an integer of 0 to 2, with the proviso that 1+m+n≥l; and

when i is 2 or greater, a plurality of A 11 s are identical or different, when j is 2 or greater, a plurality of A 22 s are identical or different, when k is 2 or greater, a plurality of A 33 s are identical or different, when l is 2, a plurality of X 11 s are identical or different, when m is 2, a plurality of X 22 s are identical or different, and when n is 2, a plurality of X 33 s are identical or different,

wherein 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 2 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 2 -C 10 heterocyclolalkenyl 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 2 -C 60 heteroaryl group, the substituted monovalent nonaromatic condensed polycyclic group, and the substituted monovalent nonaromatic condensed heteropolycyclic group is selected from:

a deuterium, —F, —Cl, —Br, —I, 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 phoshoric 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, and 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, and a C 1 -C 60 alkoxy group, each substituted with at least one of a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, a monovalent nonaromatic condensed heteropolycyclic group, —N(Q 11 )(Q 12 ), —Si(Q 13 )(Q 14 )(Q 15 ), and —B(Q 16 )(Q 17 );

a C 3 -C 10 cycloalkyl group, a C 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent nonaromatic condensed heteropolycyclic group;

a C 3 -C 10 cycloalkyl group, a C 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent nonaromatic condensed heteropolycyclic group, each substituted with at least one of a deuterium atom, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, a monovalent nonaromatic condensed heteropolycyclic group, —N(Q 21 )(Q 22 ), —Si(Q 23 )(Q 24 )(Q 25 ), and —B(Q 26 )(Q 27 ); and

—N(Q 31 )(Q 32 ), —Si(Q 33 )(Q 34 )(Q 35 ), and —B(Q 36 )(Q 37 ),

wherein Q 1 to Q 7 , Q 11 to Q 17 , Q 21 to Q 27 , and Q 31 to Q 37 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent aromatic condensed heteropolycyclic group.

2. The organic light-emitting device as claimed in claim 1 , wherein adjacent groups of Y 1 to Y 4 in Formula 1 are linked to one another to form a ring.

3. The organic light-emitting device as claimed in claim 1 , wherein one of the compound of Formula 1 or the compound of Formula 2 has a triplet energy of about 2.2 eV or greater.

4. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 1 is an electron transport material.

5. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 2 is an electron transport material.

6. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 1 is a hole transport material.

7. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 2 is a hole transport material.

8. The organic light-emitting device as claimed in claim 1 , wherein:

the compound of Formula 1 and the compound of Formula 2 are each independently a hole transport material or an electron transport material, and

a weight ratio of the hole transport material to the electron transport material is in a range of about 0.1:1 to 10:1.

9. The organic light-emitting device as claimed in claim 1 , wherein:

the compound of Formula 1 and the compound of Formula 2 are each independently a hole transport material or an electron transport material, and

an electron affinity (EA1) of the hole transport material and an electron affinity (EA2) of the electron transport material satisfy the following relationship:

EA1<EA2.

10. The organic light-emitting device as claimed in claim 1 , wherein A 1 and A 2 in Formula 1 are each independently a group represented by one of Formulae 2a to 2w:

wherein, in Formulae 2a to 2w,

R 11 , R 12 , Z 1 , and Z 2 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone, 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 20 alkyl group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group, a substituted or unsubstituted monovalent nonaromatic condensed polycyclic group, a substituted or unsubstituted monovalent nonaromatic condensed heteropolycyclic group, —N(Q 11 )(Q 12 ), and —Si(Q 13 )(Q 14 )(Q 15 );

a and b are each independently an integer of 1 to 9; and

when a is 2 or greater, a plurality of Z 1 s are identical or different, and when b is 2 or greater, a plurality of Z 1 s are identical to or different,

wherein Q 11 to Q 15 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, 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 2 -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 2 -C 60 heteroaryl group, a monovalent nonaromatic condensed polycyclic group, and a monovalent aromatic condensed heteropolycyclic group; and

* indicates a binding site with an adjacent atom.

11. The organic light-emitting device as claimed in claim 1 , wherein X 1 and X 2 in Formula 1 are each independently a single bond or a group represented by one of Formulae 3a to 3w:

wherein, in Formulae 3a to 3w,

R 11 and R 12 are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone, 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 20 alkyl group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group, a substituted or unsubstituted monovalent nonaromatic condensed polycyclic group, and a substituted or unsubstituted monovalent nonaromatic condensed heteropolycyclic group; and

* indicates a binding site with an adjacent atom.

12. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 1 is one of the following compounds:

13. The organic light-emitting device as claimed in claim 1 , wherein the compound of Formula 2 is one of the following compounds:

14. The organic light-emitting device as claimed in claim 1 , wherein the organic layer is formed via a wet process.

15. A flat panel display device comprising the organic light-emitting device as claimed in claim 1 , wherein the anode or the cathode of the organic light-emitting device is electrically connected to a source electrode or a drain electrode of a thin-film transistor.