Organic light-emitting device

1. 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 and comprising an emission layer,

wherein the emission layer comprises a first material represented by Formula 1, a second material represented by Formula 2, and a third material different from the second material and represented by Formula 8:

wherein, in Formulae 1, 2 and 8,

L 11 and L 12 are each independently selected from a substituted or unsubstituted C 6 -C 60 arylene group, and a substituted or unsubstituted C 1 -C 60 heteroarylene group;

a11 and a12 are each independently selected from 0, 1, 2, and 3;

R 11 and R 12 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

b11 and b12 are each independently selected from 1, 2, and 3;

R 13 to R 20 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 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 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, and —Si(Q 1 )(Q 2 )(Q 3 );

Ar 21 is selected from a mono, di, or tri-valent substituted or unsubstituted C 6 -C 60 arene and a mono, di, or tri-valent substituted or unsubstituted non-aromatic condensed polycycle, a valency of the C 6 -C 60 arene and the non-aromatic condensed polycycle corresponding to a value of n21;

L 21 to L 23 are each independently selected from a substituted or unsubstituted C 6 -C 60 arylene group, and a substituted or unsubstituted C 1 -C 60 heteroarylene group;

a21 to a23 are each independently selected from 0, 1, 2, and 3;

R 21 and R 22 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

n21 is selected from 1, 2, and 3;

Ar 81 is selected from a mono, di, or tri-valent substituted or unsubstituted C 6 -C 60 arene, a mono, di, or tri-valent substituted or unsubstituted non-aromatic condensed polycycle, a mono, di, or tri-valent substituted or unsubstituted non-aromatic condensed heteropolycycle, and a mono, di, or tri-valent substituted or unsubstituted C 2 -C 60 alkene, a valency of the C 6 -C 60 arene, the non-aromatic condensed polycycle, the non-aromatic condensed heteropolycycle, and the C 2 -C 60 alkene corresponding to a value of n81;

L 81 to L 83 are each independently selected from a substituted or unsubstituted C 6 -C 60 arylene group, and a substituted or unsubstituted C 1 -C 60 heteroarylene group;

a81 to a83 are each independently selected from 0, 1, 2, and 3;

R 81 and R 82 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group; and

n81 is selected from 1, 2, and 3,

wherein at least one substituent of the substituted C 6 -C 60 arene, the substituted non-aromatic condensed polycycle, the substituted non-aromatic condensed heteropolycycle, the substituted C 2 -C 60 alkene, the substituted C 6 -C 60 arylene group, the substituted C 1 -C 60 heteroarylene 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 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 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 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; 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 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 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, —Si(Q 11 )(Q 12 )(Q 13 ), —N(Q 14 )(Q 15 ), and —B(Q 16 )(Q 17 );

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; and a monovalent non-aromatic condensed heteropolycyclic 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, and a monovalent non-aromatic condensed heteropolycyclic 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 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 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, —Si(Q 21 )(Q 22 )(Q 23 ), —N(Q 24 )(Q 25 ), and —B(Q 26 )(Q 27 ); and

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

wherein Q 1 to Q 3 , Q 11 to Q 17 , Q 21 to Q 27 , and Q 31 to Q 37 are each independently selected from a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

2. The organic light-emitting device of claim 1 , wherein L 11 , L 12 , L 21 to L 23 , and L 81 to L 83 are each independently selected from groups represented by Formulae 3-1 to 3-15:

wherein, in Formulae 3-1 to 3-15,

R 31 is selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, and a naphthyl group;

b31 is selected from 1, 2, 3, and 4;

b32 is selected from 1, 2, 3, 4, 5, and 6; and

* and *′ are binding sites with an adjacent atom.

3. The organic light-emitting device of claim 1 , wherein R 11 and R 12 are each independently selected from:

a phenyl group; a naphthyl group; a fluorenyl group; a phenanthrenyl group; an anthracenyl group; a dibenzofuranyl group; and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, each substituted with at least one of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a sec-butyl group, an iso-butyl group, a tert-butyl group, a phenyl group, and a naphthyl group.

4. The organic light-emitting device of claim 1 , wherein R 11 and R 12 are each independently selected from groups represented by Formulae 5-1 to 5-26:

wherein, in Formulae 5-1 to 5-26,

Ph is a phenyl group; and

* is a binding site with an adjacent atom.

5. The organic light-emitting device of claim 1 , wherein Ar 21 is selected from:

a mono, di, or tri-valent benzene; a mono, di, or tri-valent naphthalene; a mono, di, or tri-valent anthracene; a mono, di, or tri-valent phenanthrene; a mono, di, or tri-valent triphenylene; and a mono, di, or tri-valent fluorene; and

a mono, di, or tri-valent benzene, a mono, di, or tri-valent naphthalene, a mono, di, or tri-valent anthracene, a mono, di, or tri-valent phenanthrene, a mono, di, or tri-valent triphenylene, and a mono, di, or tri-valent fluorene, each substituted with at least one of a methyl group, a phenyl group, and a naphthyl group.

6. The organic light-emitting device of claim 1 , wherein R 21 and R 22 are each independently selected from:

a phenyl group; a naphthyl group; a phenalenyl group; a phenanthrenyl group; an anthracenyl group; a triphenylenyl group; a pyrenyl group; a chrysenyl group; a perylenyl group; a hexacenyl group; a pentacenyl group; a thiophenyl group; a furanyl group; a benzofuranyl group; a benzothiophenyl group; a fluorenyl group; a spiro-fluorenyl group; a carbazolyl group; a dibenzofuranyl group; and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a benzofuranyl group, a benzothiophenyl group, a fluorenyl group, a spiro-fluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl 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 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 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, and —N(Q 34 )(Q 35 ),

wherein Q 34 and Q 35 are each independently selected from a C 6 -C 60 aryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

7. The organic light-emitting device of claim 1 , wherein R 21 and R 22 are each independently selected from groups represented by Formulae 6-1 to 6-49:

wherein, in Formulae 6-1 to 6-49,

Ph is a phenyl group; and

* is a binding site with an adjacent atom.

8. The organic light-emitting device of claim 1 , wherein n21 is selected from 1 and 2.

9. The organic light-emitting device of claim 1 , wherein Ar 81 is selected from:

a mono, di, or tri-valent anthracene; a mono, di, or tri-valent fluoranthene; a mono, di, or tri-valent triphenylene; a mono, di, or tri-valent pyrene; a mono, di, or tri-valent chrysene; a mono, di, or tri-valent perylene; a mono, di, or tri-valent hexacene; a mono, di, or tri-valent pentacene; a mono, di, or tri-valent fluorene; a mono, di, or tri-valent benzofluorene; a mono, di, or tri-valent dibenzofluorene; a mono, di, or tri-valent indenophenanthrene; a mono, di, or tri-valent dibenzofuran; a mono, di, or tri-valent dibenzothiophene; a mono, di, or tri-valent benzonaphthofuran; a mono, di, or tri-valent benzonaphthothiophene; and a mono, di, or tri-valent ethene; and

a mono, di, or tri-valent anthracene, a mono, di, or tri-valent fluoranthene, a mono, di, or tri-valent triphenylene, a mono, di, or tri-valent pyrene, a mono, di, or tri-valent chrysene, a mono, di, or tri-valent perylene, a mono, di, or tri-valent hexacene, a mono, di, or tri-valent pentacene, a mono, di, or tri-valent fluorene, a mono, di, or tri-valent benzofluorene, a mono, di, or tri-valent dibenzofluorene, a mono, di, or tri-valent indenophenanthrene, a mono, di, or tri-valent dibenzofuran, a mono, di, or tri-valent dibenzothiophene, a mono, di, or tri-valent benzonaphthofuran, a mono, di, or tri-valent benzonaphthothiophene, and a mono, di, or tri-valent ethene, each substituted with at least one of a deuterium, —F, —Cl, —Br, —I, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, and —Si(Q 31 )(Q 32 )(Q 33 ),

wherein Q 31 to Q 33 are each independently selected from a C 1 -C 60 alkyl group and a C 6 -C 60 aryl group.

10. The organic light-emitting device of claim 1 , wherein Ar 81 is selected from:

a mono, di, or tri-valent anthracene; a mono, di, or tri-valent pyrene; a mono, di, or tri-valent chrysene; a mono, di, or tri-valent fluorene; a mono, di, or tri-valent benzofluorene; a mono, di, or tri-valent dibenzofluorene; a mono, di, or tri-valent indenophenanthrene; a mono, di, or tri-valent dibenzofuran; a mono, di, or tri-valent dibenzothiophene; a mono, di, or tri-valent benzonaphthofuran; a mono, di, or tri-valent benzonaphthothiophene; and a mono, di, or tri-valent ethene; and

a mono, di, or tri-valent anthracene, a mono, di, or tri-valent pyrene, a mono, di, or tri-valent chrysene, a mono, di, or tri-valent fluorene, a mono, di, or tri-valent benzofluorene, a mono, di, or tri-valent dibenzofluorene, a mono, di, or tri-valent indenophenanthrene, a mono, di, or tri-valent dibenzofuran, a mono, di, or tri-valent dibenzothiophene, a mono, di, or tri-valent benzonaphthofuran, a mono, di, or tri-valent benzonaphthothiophene, and a mono, di, or tri-valent ethene, each substituted with at least one of a deuterium, —F, —Cl, —Br, —I, a cyano group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a sec-butyl group, an iso-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a pyridinyl group and —Si(Q 31 )(Q 32 )(Q 33 ),

wherein Q 31 to Q 33 are each independently selected from a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, and a phenyl group.

11. The organic light-emitting device of claim 1 , wherein R 81 and R 82 are each independently selected from:

a phenyl group; a naphthyl group; a phenalenyl group; a phenanthrenyl group; an anthracenyl group; a triphenylenyl group; a pyrenyl group; a chrysenyl group; a perylenyl group; a hexacenyl group; a pentacenyl group; a pyrrolyl group; a thiophenyl group; a furanyl group; an imidazolyl group; a pyridinyl group; a pyrazinyl group; a pyrimidinyl group; an indolyl group; a quinolinyl group; an isoquinolinyl group; a benzoquinolinyl group; a phthalazinyl group; a naphthyridinyl group; a quinoxalinyl group; a quinazolinyl group; a phenanthridinyl group; an acridinyl group; a phenanthrolinyl group; a phenazinyl group; a benzimidazolyl group; a benzofuranyl group; a benzothiophenyl group; a triazolyl group; a triazinyl group; a fluorenyl group; a benzofluorenyl group; a spiro-fluorenyl group; a carbazolyl group; a benzocarbazolyl group; a dibenzofuranyl group; and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a hexacenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a fluorenyl group, a benzofluorenyl group, a spiro-fluorenyl group, a carbazolyl group, a benzocarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl 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 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 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an indazolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, and —Si(Q 31 )(Q 32 )(Q 33 ),

wherein Q 31 to Q 33 are each independently selected from a C 1 -C 20 alkyl group, a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

12. The organic light-emitting device of claim 1 , wherein R 81 and R 82 are each independently selected from:

a phenyl group; a naphthyl group; a fluorenyl group; a carbazolyl group; a dibenzofuranyl group; and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl 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 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 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, and —Si(Q 31 )(Q 32 )(Q 33 ),

wherein Q 31 to Q 33 are each independently selected from a C 1 -C 20 alkyl group and a C 6 -C 60 aryl group.

13. The organic light-emitting device of claim 1 , wherein n81 is 2.

14. The organic light-emitting device of claim 1 , wherein the first material is represented by Formula 1-11:

wherein, in Formula 1-11,

a11 and a12 are each independently selected from 0 and 1.

15. The organic light-emitting device of claim 1 , wherein the second material is represented by one of Formulae 2-1 and 2-2:

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

L 25 to L 27 are each independently selected from a substituted or unsubstituted C 6 -C 60 arylene group, and a substituted or unsubstituted C 1 -C 60 heteroarylene group;

a25 to a27 are each independently selected from 0, 1, 2, and 3; and

R 23 and R 24 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group.

16. The organic light-emitting device of claim 1 , wherein the third material is represented by one of Formulae 8-11 and 8-12:

wherein, in Formulae 8-11 and 8-12,

L 85 to L 87 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

a85 to a87 are each independently selected from 0, 1, 2, and 3; and

R 83 and R 84 are each independently selected from a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group.

17. The organic light-emitting device of claim 1 , wherein the third material is a fluorescent dopant.

18. The organic light-emitting device of claim 1 , wherein the third material has a maximum emission wavelength of about 400 nm to about 550 nm.

19. The organic light-emitting device of claim 1 , wherein the organic light-emitting device comprises one or more subpixels; and each subpixel comprises a single emission layer.

20. The organic light-emitting device of claim 1 , wherein the organic light-emitting device further comprises a hole transport region and an electron transport region; and stacked upon one another in an order of the first electrode, the hole transport region, the emission layer, the electron transport region, and the second electrode.