# US 11,114,625 B2 · Organic light-emitting device

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- Number: US 11,114,625 B2
- Document ID: US11114625B2
- Status: Granted
- Kind: B2
- Application number: 14/807,778
- Filed: 2015-07-23
- Published: 2016-06-30
- Granted: 2021-09-07
- Earliest claimed: 2014-12-31
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Hwan-Hee Cho; Myeong-Suk Kim; Sung-Wook Kim
- Web page: https://patentgrep.com/patent/US11114625B2

## CPC

- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/16: Electron transporting layers
- H10K 85/321: {Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]}
- H10K 85/40: Organosilicon compounds, e.g. TIPS pentacene
- H10K 85/624: {containing six or more rings}
- H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene}
- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/6574: {comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes}
- H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene}
- H10K 2101/10: Triplet emission
- H10K 2101/90: {Multiple hosts in the emissive layer}
- H10K 2102/103: {comprising indium oxides, e.g. ITO}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light-emitting device includes a first electrode; a second electrode; an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, and an electron transport region between the emission layer and the second electrode. The emission layer includes a first compound represented by Formula 1 and a second compound represented by any one of Formulae 2-1 to 2-5. The electron transport region includes a third compound represented by Formula 7. The organic light-emitting device may have low driving voltage, high efficiency, and a long lifespan.

## Claims

### Claim 1

An organic light-emitting device comprising:
a first electrode; a second electrode; an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer, and
an electron transport region between the emission layer and the second electrode,
wherein the emission layer comprises a first compound represented by Formula 1 and a second compound represented by any one of Formulae 2-1 to 2-5; and
wherein the electron transport region comprises a third compound represented by Formula 7:
wherein in Formulae 1, 2-1 to 2-5, and 7,
A11, A12, A13, A14, A21, and A22 are each independently selected from a benzene, a naphthalene, a pyridine, a pyrimidine, a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
at least one of A21 and A22 is each independently selected from a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
X11 is N[(L12)a12-(R12)b12];
X21 is selected from N[(L22)a22-(R22)b22] and C[(L22)a22-(R22)b22][R26];
L11 to L13, and L71 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group;
L21 and L22 are each independently selected from groups represented by Formulae 3-1 to 3-19:
wherein in Formulae 3-1 to 3-19,
X31 is selected from O, S, and C(R33)(R34);
R31 to R34 are each independently selected from hydrogen, 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, 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;
b33 is selected from 1, 2, and 3; and
* and *′ each indicate a binding site to a neighboring atom;
a11 to a13, a21, a22, and a71 are each independently selected from 0, 1, 2, 3, 4, and 5;
R11 and R12 are each independently selected from RHT and RET, and at least one selected from R11 and R12 is RET;
R21 and R22 are each independently RHT,
provided that when X21 is N[(L22)a22-(R22)b22], R21 and R22 are each independently not a substituted or unsubstituted furanyl group, carbazolyl group, benzofuranyl group, benzothiophenyl group, dibenzofuranyl group, dibenzothiophenyl group, benzocarbazolyl group, dibenzocarbazolyl group, thianthrenyl group, phenoxathinyl group, or dibenzodioxinyl group, and
when X21 is C[(L22)a22-(R22)b22][R26], R21 is not a substituted or unsubstituted phenyl group or a substituted or unsubstituted fluorenyl group;
R71 is selected from groups represented by Formulae 6-1 to 6-44 and 6-46 to 6-63 below:
wherein in Formulae 6-1 to 6-44 and 6-46 to 6-63,
R61 and R62 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55);
b61 is selected from 1, 2, 3, and 4; and
b62 is selected from 1, 2, and 3;
b63 is selected from 1, 2, 3, 4, 5, and 6;
b64 is selected from 1, 2, 3, 4, and 5;
b65 is selected from 1 and 2; and
* indicates a binding site to a neighboring atom,
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group;
b11, b12, b21, and b22 are each independently selected from 1, 2, 3, and 4;
R13 to R16, R26, and R72 to R80 are each independently selected from hydrogen, 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), and —B(Q6)(Q7);
R23 to R25 are each independently selected from hydrogen and a phenyl group;
b13 to b16 and b23 to b25 are each independently selected from 1, 2, 3 and 4;
RHT is a hole transport group selected from:
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group;
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, —N(Q41)(Q42), —Si(Q43)(Q44)(Q45), and —B(Q46)(Q47); and
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group, each substituted with at least one selected from a phenyl group, a naphthyl group, a fluorenyl group, and a carbazolyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a carbazolyl group, —N(Q51)(Q52), —Si(Q53)(Q54)(Q55), and —B(Q56)(Q57);
RET is an electron transport group selected from:
a pyrrolyl 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 isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group;
a pyrrolyl 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 isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, —N(Q41)(Q42), —Si(Q43)(Q44)(Q45), and —B(Q46)(Q47); and
a pyrrolyl 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 isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group, each substituted with at least one selected from a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a carbazolyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, —N(Q51)(Q52), —Si(Q53)(Q54)(Q55), and —B(Q56)(Q57); and
at least one substituent of the substituted C3-C10 cycloalkylene group, the substituted C1-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C1-C10 heterocycloalkenylene group, the substituted C6-C60 arylene group, the substituted C1-C60 heteroarylene group, the substituted divalent non-aromatic condensed polycyclic group, the substituted divalent non-aromatic condensed heteropolycyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:
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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q11)(C12), —Si(Q13)(Q14)(Q15), and —B(Q16)(Q17);
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q21)(Q22), —Si(Q23)(Q24)(Q25), and —B(Q26)(Q27); and
—N(Q31)(Q32), —Si(Q33)(Q34)(Q35), and —B(Q36)(Q37);
wherein Q1 to Q7, Q11 to Q17, Q21 to Q27 and Q31 to Q37 are each independently selected from hydrogen, a C1-C60 alkyl group, a C1-C60 alkoxy group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, and
wherein Q41 to Q47 and Q51 to Q57 are each independently selected from a C1-C60 alkyl group, a C6-C60 aryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

### Claim 2 (depends on 1)

The organic light-emitting device of claim 1, wherein
neither the first compound nor the second compound comprises a cyano group.

### Claim 3 (depends on 1)

The organic light-emitting device of claim 1, wherein
L11 to L13, and L71 are each independently selected from groups represented by Formulae 3-1 to 3-19:
wherein in Formulae 3-1 to 3-19,
X31 is selected from O, S, and C(R33)(R34);
R31 to R34 are each independently selected from hydrogen, 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, 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;
b33 is selected from 1, 2, and 3; and
* and *′ each indicate a binding site to a neighboring atom.

### Claim 4 (depends on 1)

The organic light-emitting device of claim 1, wherein
RHT is selected from groups represented by Formulae 5-1 to 5-10 below:
wherein in Formulae 5-1 to 5-10,
X51 is selected from a single bond, N(R54), C(R54)(R55), O, and S;
X52 is selected from N(R56), C(R56)(R57), O, and S;
R51, R52 and R54 to R57 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, and a carbazolyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55);
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group;
b51 is selected from 1, 2, 3, 4, and 5;
b52 is selected from 1, 2, 3, 4, 5, 6, and 7;
b53 is selected from 1, 2, and 3;
b54 is selected from 1, 2, 3, and 4;
b55 is selected from 1, 2, 3, 4, 5, and 6; and
* indicates a binding site to a neighboring atom.

### Claim 5 (depends on 1)

The organic light-emitting device of claim 1, wherein
RET is selected from groups represented by Formulae 6-1 to 6-63 below:
wherein in Formulae 6-1 to 6-63,
R61 to R63 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55);
b61 is selected from 1, 2, 3, and 4; and
b62 is selected from 1, 2, and 3;
b63 is selected from 1, 2, 3, 4, 5, and 6;
b64 is selected from 1, 2, 3, 4, and 5;
b65 is selected from 1 and 2; and
* indicates a binding site to a neighboring atom,
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group.

### Claim 6 (depends on 1)

The organic light-emitting device of claim 1, wherein
the first compound is represented by Formula 1-1 below:

### Claim 7 (depends on 1)

The organic light-emitting device of claim 1, wherein
the second compound is represented by any one of Formulae 2-11 to 2-15 below:

### Claim 8 (depends on 1)

The organic light-emitting device of claim 1, wherein
the third compound is represented by Formula 7-1 below:

### Claim 9

An organic light-emitting device comprising:
a first electrode; a second electrode; an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer, and
an electron transport region between the emission layer and the second electrode,
wherein the emission layer comprises a first compound represented by Formula 1 and a second compound represented by one of Formulae 2-1 to 2-5; and
wherein the electron transport region comprises a third compound represented by Formula 7:
wherein in Formulae 1, 2-1 to 2-5, and 7,
A11, A12, A13, A14, A21, and A22 are each independently selected from a benzene, a naphthalene, a pyridine, a pyrimidine, a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
at least one of A21 and A22 is each independently selected from a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
X11 is N[(L12)a12-(R12)b12];
X21 is selected from O, S, N[(L22)a22-(R22)b22], and C[(L22)a22-(R22)b22][R26];
L11 and L12 are each independently selected from groups represented by Formulae 3-1 to 3-19:
wherein in Formulae 3-1 to 3-19,
X31 is selected from O, S, and C(R33)(R34);
R31 to R34 are each independently selected from hydrogen, 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, 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;
b33 is selected from 1, 2, and 3; and
* and *′ each indicate a binding site to a neighboring atom;
L13, L21, L22, and L71 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group;
a11 to a13, a21, a22, and a71 are each independently selected from 0, 1, 2, 3, 4, and 5;
R11 and R12 are each independently RHT;
R21 and R22 are each independently selected from RHT and RET, and at least one selected from R21 and R22 is RET;
R71 is selected from groups represented by Formulae 6-4 to 6-39 below:
wherein in Formulae 6-4 to 6-39,
R61 and R62 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55),
b62 is selected from 1, 2, and 3;
b63 is selected from 1, 2, 3, 4, 5, and 6;
b64 is selected from 1, 2, 3, 4, and 5; and
* indicates a binding site to a neighboring atom,
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group;
b11, b12, b21, and b22 are each independently selected from 1, 2, 3, and 4;
R13 to R16, R23 to R25, and R72 to R80 are each independently hydrogen, 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted a monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;
b13 to b16 and b23 to b25 are each independently selected from 1, 2, 3 and 4;
RHT is a hole transport group selected from:
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group;
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, —N(Q41)(Q42), —Si(Q43)(Q44)(Q45), and —B(Q46)(Q47); and
a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thianthrenyl group, a phenoxathinyl group, and a dibenzodioxinyl group, each substituted with at least one selected from a phenyl group, a naphthyl group, a fluorenyl group, and a carbazolyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a carbazolyl group, —N(Q51)(Q52), —Si(Q53)(Q54)(Q55), and —B(Q56)(Q57);
RET is an electron transport group selected from:
a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzathiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group;
a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, —N(Q41)(Q42), —Si(Q43)(Q44)(Q45), and —B(Q46)(Q47); and
a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a benzophenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a naphthoimidazolyl group, a benzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazoquinolinyl group, an imidazoisoquinolinyl group, a pyridobenzofuranyl group, a pyrimidobenzofuranyl group, a pyridobenzothiophenyl group, and a pyrimidobenzothiophenyl group, each substituted with at least one selected from a phenyl group, a naphthyl group, a fluorenyl group, and a carbazolyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl 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 C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a carbazolyl group, —N(Q51)(Q52), —Si(Q53)(Q54)(Q55), and —B(Q56)(Q57); and
at least one substituent of the substituted C3-C10 cycloalkylene group, the substituted C1-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C1-C10 heterocycloalkenylene group, the substituted C6-C60 arylene group, the substituted C1-C60 heteroarylene group, the substituted divalent non-aromatic condensed polycyclic group, the substituted divalent non-aromatic condensed heteropolycyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:
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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q11)(Q12), —Si(Q13)(Q14)(Q15), and —B(Q16)(Q17);
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q21)(Q22), —Si(Q23)(Q24)(Q25), and —B(Q26)(Q27); and
—N(Q31)(Q32), —Si(Q33)(Q34)(Q35), and —B(Q36)(Q37);
wherein Q11 to Q17, Q21 to Q27, and Q31 to Q37 are each independently selected from hydrogen, a C1-C60 alkyl group, a C1-C60 alkoxy group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, and
wherein Q41 to Q47 and Q51 to Q57 are each independently selected from a C1-C60 alkyl group, a C6-C60 aryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

### Claim 10 (depends on 9)

The organic light-emitting device of claim 9, wherein
neither the first compound nor the second compound comprises a cyano group.

### Claim 11 (depends on 9)

The organic light-emitting device of claim 9, wherein
L13, L21, L22, and L71 are each independently selected from groups represented by Formulae 3-1 to 3-19:
wherein in Formulae 3-1 to 3-19,
X31 is selected from O, S, and C(R33)(R34);
R31 to R34 are each independently selected from hydrogen, 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, 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;
b33 is selected from 1, 2, and 3; and
* and *′ each indicate a binding site to a neighboring atom.

### Claim 12 (depends on 9)

The organic light-emitting device of claim 9, wherein
RHT is selected from groups represented by Formulae 5-1 to 5-12 below:
wherein in Formulae 5-1 to 5-12,
X51 is selected from a single bond, N(R54), C(R54)(R55), O, and S;
X52 is selected from N(R56), C(R56)(R57), O, and S;
R51 to R57 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, and a carbazolyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55);
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group;
b51 is selected from 1, 2, 3, 4, and 5;
b52 is selected from 1, 2, 3, 4, 5, 6, and 7;
b53 is selected from 1, 2, and 3;
b54 is selected from 1, 2, 3, and 4;
b55 is selected from 1, 2, 3, 4, 5, and 6; and
* indicates a binding site to a neighboring atom.

### Claim 13 (depends on 9)

The organic light-emitting device of claim 9, wherein
RET is selected from groups represented by Formulae 6-10 to 6-63 below:
wherein in Formulae 6-10 to 6-63,
R61 to R63 are each independently selected from:
deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, —N(Q41)(Q42), and —Si(Q43)(Q44)(Q45); and
a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a pyridinyl group, each substituted with at least one selected from deuterium, a C1-C20 alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, —N(Q51)(Q52), and —Si(Q53)(Q54)(Q55),
b61 is selected from 1, 2, 3, and 4; and
b62 is selected from 1, 2, and 3;
b63 is selected from 1, 2, 3, 4, 5, and 6;
b64 is selected from 1, 2, 3, 4, and 5;
b65 is selected from 1 and 2; and
* indicates a binding site to a neighboring atom,
wherein Q41 to Q45 and Q51 to Q55 are each independently selected from 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, a biphenyl group, a naphthyl group, and a fluorenyl group.

### Claim 14 (depends on 9)

The organic light-emitting device of claim 9, wherein
the first compound is represented by Formula 1-1 below:

### Claim 15 (depends on 9)

The organic light-emitting device of claim 9, wherein
the second compound is represented by any one of Formulae 2-11 to 2-15 below:

### Claim 16 (depends on 9)

The organic light-emitting device of claim 9, wherein the third compound is represented by Formula 7-1 below:

### Claim 17

An organic light-emitting device comprising:
a first electrode; a second electrode; an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer, and
an electron transport region between the emission layer and the second electrode,
wherein the emission layer comprises a first compound represented by Formula 1 and a second compound represented by any one of Formulae 2-1 to 2-5; and
wherein the electron transport region comprises a third compound represented by Formula 7:
wherein in Formulae 1, 2-1 to 2-5, and 7,
A11, A12, A13, A14, A21, and A22 are each independently selected from a benzene, a naphthalene, a pyridine, a pyrimidine, a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
X11 is selected from O, S, N[(L12)a12-(R12)b12], C[(L12)a12-(R12)b12][R17], Si[(L12)a12-(R12)b12][R17], P[(L12)a12-(R12)b12], B[(L12)a12-(R12)b12], and P(═O)[(L12)a12-(R12)b12];
X21 is selected from Si[(L22)a22-(R22)b22][R26], P[(L22)a22-(R22)b22], B[(L22)a22-(R22)b22], and P(═O)[(L22)a22-(R22)b22];
L11 to L13, L21, L22, and L71 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group;
a11 to a13, a21, a22, and a71 are each independently selected from 0, 1, 2, 3, 4, and 5;
R11 and R12 are each independently selected from RHT and RET, and at least one selected from R11 and R12 is RET;
R21 and R22 are each independently RHT;
R71 is RET;
b11, b12, b21, and b22 are each independently selected from 1, 2, 3, and 4;
R13 to R17, R23 to R26, and R72 to R80 are each independently selected from hydrogen, 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), and —B(Q6)(Q7);
b13 to b16 and b23 to b25 are each independently selected from 1, 2, 3 and 4;
RHT is a hole transport group;
RET is an electron transport group; and
at least one substituent of the substituted C3-C10 cycloalkylene group, the substituted C1-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C1-C10 heterocycloalkenylene group, the substituted C6-C60 arylene group, the substituted C1-C60 heteroarylene group, the substituted divalent non-aromatic condensed polycyclic group, the substituted divalent non-aromatic condensed heteropolycyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:
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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q11)(Q12), —Si(Q13)(Q14)(Q15), and —B(Q16)(Q17);
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q21)(Q22), —Si(Q23)(Q24)(Q25), and —B(Q26)(Q27); and
—N(Q31)(Q32), —Si(Q33)(Q34)(Q35), and —B(Q36)(Q37);
wherein Q1 to Q7, Q11 to Q17, Q21 to Q27 and Q31 to Q37 are each independently selected from hydrogen, a C1-C60 alkyl group, a C1-C60 alkoxy group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

### Claim 18

An organic light-emitting device comprising:
a first electrode; a second electrode; an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer, and
an electron transport region between the emission layer and the second electrode,
wherein the emission layer comprises a first compound represented by Formula 1 and a second compound represented by one of Formulae 2-1 to 2-5; and
wherein the electron transport region comprises a third compound represented by Formula 7:
wherein in Formulae 1, 2-1 to 2-5, and 7,
A11, A12, A13, A14, A21, and A22 are each independently selected from a benzene, a naphthalene, a pyridine, a pyrimidine, a quinoline, an isoquinoline, a 2,6-naphthyridine, a 1,8-naphthyridine, a 1,5-naphthyridine, a 1,6-naphthyridine, a 1,7-naphthyridine, a 2,7-naphthyridine, a quinoxaline, a phthalazine, a quinazoline, and a cinnoline;
X11 is selected from O, S, N[(L12)a12-(R12)b12], C[(L12)a12-(R12)b12][R17], Si[(L12)a12-(R12)b12][R17], P[(L12)a12-(R12)b12], B[(L12)a12-(R12)b12], and P(═O)[(L12)a12-(R12)b12],
X21 is selected from Si[(L22)a22-(R22)b22][R26], P[(L22)a22-(R22)b22], B[(L22)a22-(R22)b22], and P(═O)[(L22)a22-(R22)b22],
L11 to L13, L21, L22, and L71 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group;
a11 to a13, a21, a22, and a71 are each independently selected from 0, 1, 2, 3, 4, and 5;
R11 and R12 are each independently RHT;
R21 and R22 are each independently selected from RHT and RET, and at least one selected from R21 and R22 is RET;
R71 is RET;
b11, b12, b21, and b22 are each independently selected from 1, 2, 3, and 4;
R13 to R17, R23 to R26, and R72 to R80 are each independently hydrogen, 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted a monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;
b13 to b16 and b23 to b25 are each independently selected from 1, 2, 3 and 4;
RHT is a hole transport group;
RET is an electron transport group; and
at least one substituent of the substituted C3-C10 cycloalkylene group, the substituted C1-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C1-C10 heterocycloalkenylene group, the substituted C6-C60 arylene group, the substituted C1-C60 heteroarylene group, the substituted divalent non-aromatic condensed polycyclic group, the substituted divalent non-aromatic condensed heteropolycyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:
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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q11)(Q12), —Si(Q13)(Q14)(Q15), and —B(Q16)(Q17);
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;
a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q21)(Q22), —Si(Q23)(Q24)(Q25), and —B(Q26)(Q27); and
—N(Q31)(Q32), —Si(Q33)(Q34)(Q35), and —B(Q36)(Q37);
wherein Q11 to Q17, Q21 to Q27, and Q31 to Q37 are each independently selected from hydrogen, a C1-C60 alkyl group, a C1-C60 alkoxy group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.