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An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer further includes: i) a hole transport regi

An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer further includes: i) a hole transport region between the first electrode and the emission layer, the hole transport region including at least one selected from a hole transport layer, a hole injection layer, and a buffer layer, and ii) an electron transport region between the emission layer and the second electrode, the electron transport region including an electron transport layer and at least one selected from a hole blocking layer and an electron injection layer; and wherein the electron transport region includes a compound represented by Formula 1 or a compound represented by Formula 2:

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1. An organic light-emitting device comprising: a first electrode;a second electrode facing the first electrode; andan organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer,wherein the organic layer further comprises: i) a hole transport r

1. An organic light-emitting device comprising: a first electrode;a second electrode facing the first electrode; andan organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer,wherein the organic layer further comprises: i) a hole transport region between the first electrode and the emission layer, the hole transport region comprising at least one selected from a hole transport layer, a hole injection layer, and a buffer layer, and ii) an electron transport region between the emission layer and the second electrode, the electron transport region comprising an electron transport layer and at least one selected from a hole blocking layer and an electron injection layer; andwherein the electron transport region comprises a compound represented by Formula 1 or a compound represented by Formula 2: wherein in Formulae 1 and 2,R1, R2 and R3 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 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 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 C2-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C2-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, —P(═O)R11R12, —P(═S)R13R14, —S(═O)2R15, and —S(═O)R16;L1, L2 and L3 are each independently selected from a single bond, a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C2-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C2-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, a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group, —P(═O)R17—, —P(═S)R18—, —S(═O)2—, and —S(═O)—;X is —O— or —S—;R11 to R18 are each independently selected from a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;a1 to a3 are each independently an integer of 0 to 3;l to n are each independently an integer of 0 to 2; andat least one substituent of the substituted C3-C10 cycloalkylene group, the substituted C2-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C2-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 C2-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C2-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 group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C3-C10 cycloalkyl group, a C2-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C2-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 C2-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C2-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 group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C2-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C2-C60 alkoxy group, a C3-C10 cycloalkyl group, a C2-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C2-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, 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, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C2-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C2-C10 heterocycloalkenyl 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. 2. The organic light-emitting device of claim 1, wherein R1 to R3 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted C6-C60 aryl 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, —P(═O)R11R12, —P(═S)R13R14, —S(═O)2R15, and —S(═O)R16. 3. The organic light-emitting device of claim 1, wherein R1 to R3 are each independently selected from hydrogen, deuterium, a cyano group, —P(═O)R11R12, —S(═O)2R15, —S(═O)R16 and groups represented by the Formulae 2a to 2g: wherein in Formulae 2a to 2g,H1 is NR21, CR22R23, —O—, or —S—,R21, R22, R23 and Z1 are each independently selected from hydrogen, deuterium, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C1-C20 heteroaryl group, a halogen group, a cyano group, a nitro group, a hydroxyl group, and a carboxy group;p is an integer of 1 to 9, and* indicates a binding site to an adjacent atom. 4. The organic light-emitting device of claim 1, wherein L1, L2 and L3 are each independently selected from a single bond, a substituted or unsubstituted C6-C60 arylene group, and a substituted or unsubstituted C1-C60 heteroarylene group. 5. The organic light-emitting device of claim 1, wherein L1, L2 and L3 are each independently selected from a single bond and groups represented by Formulae 3a to 3c: where in Formulae 3a to 3c, * indicates a binding site to an adjacent atom. 6. The organic light-emitting device of claim 1, wherein the compound of Formula 1 is represented by Formula 3: 7. The organic light-emitting device of claim 1, wherein the compound of Formula 2 is represented by Formula 4: 8. The organic light-emitting device of claim 1, wherein the electron transport layer comprises the compound represented by Formula 1 or the compound represented by Formula 2. 9. The organic light-emitting device of claim 1, wherein the compound represented by Formula 1 and the compound represented by Formula 2 are each independently selected from Compounds 1-89: 10. The organic light-emitting device of claim 1, wherein the hole transport region comprises a charge-generating material. 11. The organic light-emitting device of claim 10, wherein the charge-generating material is a p-dopant. 12. The organic light-emitting device of claim 11, wherein the p-dopant is selected from a quinone derivative, a metal oxide, and a cyano group-containing compound. 13. The organic light-emitting device of claim 12, wherein the quinone derivative is tetracyanoquinonedimethane (TCNQ) or 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ). 14. The organic light-emitting device of claim 12, wherein the metal oxide is a tungsten oxide or a molybdenum oxide. 15. The organic light-emitting device of claim 12, wherein the cyano group-containing compound is Compound HT-D1: 16. The organic light-emitting device of claim 1, wherein the electron transport region comprises a metal complex. 17. The organic light-emitting device of claim 16, wherein the metal complex is a Li complex. 18. The organic light-emitting device of claim 16, wherein the metal complex is a lithium quinolate (LiQ) or Compound ET-D2: 19. The organic light-emitting device of claim 1, wherein the organic layer is formed by using a wet process. 20. A flat display apparatus comprising the organic light-emitting device of claim 1, wherein the first electrode of the organic light-emitting device is electrically connected to a source electrode or a drain electrode of a thin film transistor.