Organic light-emitting device

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit under 35 U.S.C. § 119 of Korean Patent Application No. 10-2015-0108869, filed on Jul. 31, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present invention relates to an organic light-emitting device.

DISCUSSION OF RELATED ART

Organic light-emitting devices are self-emission devices and have wide viewing angles, high contrast ratios, short response times, excellent luminance, excellent driving voltage, excellent response speed characteristics, and produce full-color images.

An organic light-emitting device may include a first electrode disposed on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode sequentially disposed on the first electrode. Holes provided from the first electrode may move toward the emission layer through the hole transport region, electrons provided from the second electrode may move toward the emission layer through the electron transport region, and when holes and electrons meet in the emission layer, they may recombine to produce excitons. These excitons transit from an excited state to a ground state, thereby generating light. Using proper structures in the organic light-emitting device to obtain good electron/hole transport and to reduce electron-hole recombination loss is generally required for a high performance organic light-emitting device.

SUMMARY

Exemplary embodiments of the present invention provide an organic light-emitting device having high efficiency and long lifespan.

According to an exemplary embodiment of the present invention, there is provided an organic light-emitting device that may include: a first electrode; a second electrode facing the first electrode; an emission layer disposed between the first electrode and the second electrode and including a host and a dopant; an electron blocking layer disposed between the first electrode and the emission layer; and an electron transport region disposed between the emission layer and the second electrode, in which the electron blocking layer includes a metal halide, a metal oxide, or a combination thereof, and an actually measured lowest unoccupied molecular orbital (LUMO) value of the electron blocking layer is greater than an actually measured LUMO value of the host in the emission layer.

According to an exemplary embodiment of the present invention, there is provided an organic light-emitting device that may include: a substrate; an anode on the substrate; a cathode facing the anode; an emission layer disposed between the anode and the cathode and including a host and a dopant; an electron blocking layer disposed between the anode and the emission layer; a hole transport region disposed between the anode and the electron blocking layer; and an electron transport region disposed between the emission layer and the second electrode, in which an actually measured lowest unoccupied molecular orbital (LUMO) value of the electron blocking layer is greater than an actually measured LUMO value of the host in the emission layer with a difference in a range of about 0.3 eV to about 2.0 eV, and the electron blocking layer does not include organic material.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the present invention will become apparent and more readily appreciated from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an organic light-emitting device according to an exemplary embodiment of the present invention; and

FIG. 2 is a diagram illustrating work functions of first and second electrodes, and the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) levels of each of a hole injection layer, a hole transport layer, an electron blocking layer, an emission layer, an electron transport layer, and an electron injection layer according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout the specification. In this regard, the exemplary embodiments of the present invention may have different forms and should not be construed as being limited to the specific descriptions set forth herein. Accordingly, the exemplary embodiments are merely described below, by referring to the figures, to explain aspects of the present invention. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

The term “C₁-C₆₀alkyl group” as used herein refers to a linear or branched aliphatic saturated hydrocarbon monovalent group having 1 to 60 carbon atoms. Examples thereof may include a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group. The term “C₁-C₆₀alkylene group” as used herein refers to a divalent group having a structure the same as that of the C₁-C₆₀alkyl group.

The term “C₁-C₆₀alkoxy group” as used herein refers to a monovalent group represented by —OA₁₀₁(wherein A₁₀₁is the C₁-C₆₀alkyl group). Examples thereof may include a methoxy group, an ethoxy group, and an isopropyloxy group.

The term “C₂-C₆₀alkenyl group” as used herein refers to a hydrocarbon group having at least one carbon-carbon double bond in the middle or at the terminus of the C₂-C₆₀alkyl group. Examples thereof may include an ethenyl group, a propenyl group, and a butenyl group. The term “C₂-C₆₀alkenylene group” as used herein refers to a divalent group having a structure the same as that of the C₂-C₆₀alkenyl group.

The term “C₂-C₆₀alkynyl group” as used herein refers to a hydrocarbon group having at least one carbon-carbon triple bond in the middle or at the terminus of the C₂-C₆₀alkyl group. Examples thereof may include an ethynyl group and a propynyl group. The term “C₂-C₆₀alkynylene group” as used herein refers to a divalent group having a structure the same as that of the C₂-C₆₀alkynyl group.

The term “C₃-C₆₀cycloalkyl group” as used herein refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms. Examples thereof may include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. The term “C₃-C₁₀cycloalkylene group” as used herein refers to a divalent group having a structure the same as that of the C₃-C₁₀cycloalkyl group.

The term “C₁-C₁₀heterocycloalkyl group” as used herein refers to a monovalent monocyclic group having at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom and 1 to 10 carbon atoms. Examples thereof may include a tetrahydrofuranyl group and a tetrahydrothiophenyl group. The term “C₁-C₁₀heterocycloalkylene group” as used herein refers to a divalent group having a structure the same as that of the C₁-C₁₀heterocycloalkyl group.

The term “C₃-C₁₀cycloalkenyl group” as used herein refers to a monovalent monocyclic group that has 3 to 10 carbon atoms and at least one carbon-carbon double bond in its ring and is not aromatic. Examples thereof may include a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. The term “C₃-C₁₀cycloalkenylene group” as used herein refers to a divalent group having a structure the same as that of the C₃-C₁₀cycloalkenyl group.

The term “C₁-C₁₀heterocycloalkenyl group” as used herein refers to a monovalent monocyclic group that has at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least one carbon-carbon double bond in its ring. Non-limiting examples of the C₁-C₁₀heterocycloalkenyl group include a 2,3-dihydrofuranyl group and a 2,3-dihydrothiophenyl group. The term “C₁-C₁₀heterocycloalkenylene group” as used herein refers to a divalent group having a structure the same as that of the C₁-C₁₀heterocycloalkenyl group.

The term “C₆-C₆₀aryl group” as used herein refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. The term “C₆-C₆₀arylene group” as used herein refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Examples of the C₆-C₆₀aryl group may include a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and a chrysenyl group. When the C₆-C₆₀aryl group and the C₆-C₆₀arylene group each include two or more rings, the rings may be fused.

The term “C₁-C₆₀heteroaryl group” as used herein refers to a monovalent group having a heterocyclic aromatic system that has at least one heteroatom selected from N, O, P, and S as a ring-forming atom, in addition to 1 to 60 carbon atoms. The term “C₁-C₆₀heteroarylene group” as used herein refers to a divalent group having a heterocyclic aromatic system that has at least one heteroatom selected from N, O, P, and S as a ring-forming atom, in addition to 1 to 60 carbon atoms. Examples of the C₁-C₆₀heteroaryl group may include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group. When the C₁-C₆₀heteroaryl group and the C₁-C₆₀heteroarylene group each include two or more rings, the rings may be fused.

The term “C₆-C₆₀aryloxy group” as used herein refers to —OA₁₀₂(wherein A₁₀₂is a C₆-C₆₀aryl group). The term “C₆-C₆₀arylthio group” as used herein indicates —SA₁₀₃(wherein A₁₀₃is a C₆-C₆₀aryl group).

The term “monovalent non-aromatic condensed polycyclic group” as used herein refers to a monovalent group that has two or more rings condensed to each other, only carbon atoms (e.g., 8 to 60 carbon atoms) as ring-forming atoms, wherein the entire molecular structure is non-aromatic. Examples of the monovalent non-aromatic condensed polycyclic group may include a fluorenyl group. The term “divalent non-aromatic condensed polycyclic group” as used herein refers to a divalent group having a structure the same as that of the monovalent non-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein refers to a monovalent group that has two or more rings condensed to each other, and a heteroatom selected from N, O, Si, P, and S, in addition to carbon atoms (e.g., 1 to 60 carbon atoms), as ring-forming atoms, wherein the entire molecular structure is non-aromatic. Examples of the monovalent non-aromatic condensed heteropolycyclic group may include a carbazolyl group. The term “divalent non-aromatic condensed heteropolycyclic group” as used herein refers to a divalent group having a structure the same as that of the monovalent non-aromatic condensed heteropolycyclic group.

At least one of substituents of the substituted C₃-C₁₀cycloalkylene group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀cycloalkenylene group, substituted C₁-C₁₀heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀heteroarylene group, substituted divalent non-aromatic condensed polycyclic group, substituted divalent non-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀alkyl group, substituted C₂-C₆₀alkenyl group, substituted C₂-C₆₀alkynyl group, substituted C₁-C₆₀alkoxy group, substituted C₃-C₁₀cycloalkyl group, substituted C₁-C₁₀heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀heterocycloalkenyl group, substituted C₆-C₆₀aryl group, substituted C₆-C₆₀aryloxy group, substituted C₆-C₆₀arylthio group, substituted C₁-C₆₀heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group may be 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-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₆₀alkoxy group;

a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₆₀alkoxy 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-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q₁₁)(Q₁₂)(Q₁₃), —B(Q₁₄)(Q₁₅), —N(Q₁₆)(Q₁₇), a biphenyl group, and a terphenyl group;

a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —B(Q₂₄)(Q₂₅), —N(Q₂₆)(Q₂₇), a biphenyl group, and a terphenyl group;

and —Si(Q₃₁)(Q₃₂)(Q₃₃), —B(Q₃₄)(Q₃₅), and —N(Q₃₆)(Q₃₇), wherein Q₁₁to Q₁₇, Q₂₁to Q₂₇, and Q₃₁to Q₃₇may each independently be 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-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group.

The term “a biphenyl group” as used herein refers to a monovalent group having two benzenes linked via a single bond. The term “a terphenyl group” as used herein refers to a monovalent group having three benzenes linked via a single bond.

FIG. 1 is a schematic view of an organic light-emitting device 10 according to an exemplary embodiment of the present invention. The organic light-emitting device may include a first electrode 110, an electron blocking layer 130, an emission layer 150, an electron transport region 170, and a second electrode 190. The electron blocking layer 130 may be disposed between the first electrode 110 and the emission layer 150.

In the organic light-emitting device 10, the first electrode 110 may be an anode, the second electrode 190 may be a cathode, and the electron blocking layer 130 may directly contact the first electrode 110 (the anode) and the emission layer 150.

Hereinafter, a structure of an organic light-emitting device according to an exemplary embodiment of the present invention, and a method of manufacturing an organic light-emitting device according to an exemplary embodiment of the present invention, will be described in connection with FIG. 1.

In FIG. 1, a substrate may be additionally disposed under the first electrode 110 or above the second electrode 190. The substrate may be a glass substrate or a transparent plastic substrate, each having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water-resistance.

The first electrode 110 may be formed by depositing or sputtering a material for the first electrode 110 on the substrate. When the first electrode 110 is an anode, the material for the first electrode 110 may be selected from those materials having high work function to facilitate hole injection. The first electrode 110 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. The material for the first electrode 110 may include a transparent and highly conductive material. Examples of such kind of material may include indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO₂), and zinc oxide (ZnO). When the first electrode 110 is a semi-transmissive electrode or a reflective electrode, at least one selected from, for example, magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag) may be used as a material for the first electrode 110. The first electrode 110 may be an anode.

The first electrode 110 may have a single-layered structure, or a multi-layered structure including two or more layers. For example, the first electrode 110 may have a three-layered structure of ITO/Ag/ITO, but the structure of the first electrode 110 is not limited thereto.

The electron blocking layer 130, the emission layer 150, and the electron transport region 170 may be sequentially stacked on the first electrode 110.

The electron blocking layer 130 may prevent electrons injected from the second electrode 190 passing through the electron transport region 170 and the emission layer 150 to reach the first electrode 110.

The electron blocking layer 130 may include, for example, a metal halide, a metal oxide, or a combination thereof.

In an exemplary embodiment of the present invention, the electron blocking layer 130 may include a metal halide, a metal oxide or a combination thereof. That is, the electron blocking layer 130 may not include an organic material. For example, the metal halide may be a halide of a metal selected from lithium (Li), beryllium (Be), sodium (Na), magnesium (Mg), aluminum (Al), potassium (K), calcium (Ca), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), gallium (Ga), germanium (Ge), rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), cadmium (Cd), indium (In), tin (Sn), cesium (Cs), barium (Ba), lanthanum (La), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), thallium (Tl), lead (Pb), lanthanoids, actinoids, and any combination thereof.

In an exemplary embodiment of the present invention, the metal halide may be a halide of a metal selected from Li, Na, K, Rb, Cs, Cu, Ag, Au, Cr, Ni, V, lanthanoids, and any combination thereof.

According to an exemplary embodiment of the present invention, the metal halide may be a halide of a metal selected from Cu, Ni, Cr, and any combination thereof, but exemplary embodiments are not limited thereto.

In an exemplary embodiment of the present invention, the metal halide may be selected from CuI, CuF, CuF₂, CuCl, NiF₂, NiCl₂, NiI₂, CrF₂, CrCl₂, and any combination thereof.

In an exemplary embodiment of the present invention, the metal halide may be CuI or a combination of CuI and CuF (e.g., a mixture of CuI and CuF), but exemplary embodiments are not limited thereto. In an exemplary embodiment of the present invention, the metal halide may be a combination of CuI and NiF₂(e.g., a mixture of CuI and NiF₂), but exemplary embodiments are not limited thereto.

The metal oxide may be selected from an oxide of a metal selected from:

Li, Be, Na, Mg, Al, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Cs, Ba, La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Tl, Pb, lanthanoids, and actinoids;

an oxide of a complex metal of at least two selected from Li, Be, Na, Mg, Al, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, antimony (Sb), Cs, Ba, La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Tl, Pb, bismuth (Bi), Polonium (Po), lanthanoids, and actinoids; and any combination thereof.

In an exemplary embodiment of the present invention, the metal oxide may be selected from:

an oxide of a metal selected from Li, Al, Sn, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Nb, Ba, Ru, Hf, Ta, and Rh;

an oxide of a complex metal of at least two selected from Li, Al, Sn, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Nb, Ba, Ru, Hf, Ta, and Rh; and

any combination thereof.

According to an exemplary embodiment of the present invention, the metal oxide may be selected from:

an oxide of a metal selected from Cu, Al, Ni, Zn, and Rh;

an oxide of a complex metal of at least two selected from Cu, Al, Ni, Zn, and Rh; and

any combination thereof.

According to an exemplary embodiment of the present invention, the metal oxide may be selected from ZrO₂, Li₂O, Na₂O, RbO₂, BeO, CaO, SrO, BaO, SiO₂, TiO, Ti₂O₃, TiO₂, V₂O₃, V₂O₄, V₂O₅, Mn₃O₄, MnO, Mn₂O₃, MnO₂, FeO, Fe₃O₄, ZnO, ZnO₂, MgO, SnO₂, In₂O₃, CrO₃, CuO, Cu₂O, HfO₂, Fe₂O₃, CoO, Co₃O₄, NiO, NiO₂, CeO₂, Y₂O₃, NbO, NbO₂, Nb₂O₅, MoO₂, MoO₃, RuO₂, Rh₂O₃, RhO₂, PdO, AgO, Ag₂O, CdO, Ta₂O₅, WO₃, WO₂, ReO₃, OsO₄, IrO₂, PtO₂, Au₂O₃, HgO, Ga₂O₃, GeO₂, SnO, PbO₂, PbO, PbO₄, Sb₂O₃, Sb₂O₄, Sb₂O₅, Bi₂O₃, As₂O₃, As₂O₅, SeO₂, Eu₂O₃, CuAlO₂, CuGaO₂, CuYO₂, ZnRh₂O₄, ZrSiO₄, RbTiO₃, RbSeO₃, FeLiO₂, FeMoO₄, FeO₃Ti, Fe₂O₄Zn, Fe₂O₅Ti, Fe₅O₁₂Y₃, Fe₁₂O₁₉Sr, NiFeO₄, Nb₂O₆Pb, NbO₆Zn, MoO₄Pb, MoO₄Sr, MoO₄Zn, AgOV, AgO₄Re, Ag₂CrO₄, Ag₂O, Ag₂O₄W, CdO₃Zr, Ga₅Gd₃O₁₂, TiReO₄, PbSeO₃, PbTiO₃, PbZrO₃, Bi₂O₇Ti₂, Ce₂O₁₂W₃, and any combination thereof, but exemplary embodiments are not limited thereto.

According to an exemplary embodiment of the present invention, the metal oxide may be selected from CuO, Cu₂O, CuAlO₂, CuGaO₂, CuYO₂, NiO, ZnRh₂O₄, and any combination thereof. For example, the metal oxide may be CuO or a combination of CuO and Cu₂O (e.g., a mixture of CuO and Cu₂O), but exemplary embodiments are not limited thereto. In an exemplary embodiment of the present invention, the metal oxide may be a combination of CuO and NiO (e.g., a mixture of CuO and NiO) or a combination of CuO and ZnRh₂O₄(e.g., a mixture of CuO and ZnRh₂O₄), but exemplary embodiments are not limited thereto.

The thickness of the electron blocking layer 130 may be in a range of about 5 Angstroms (□) to about 100□, for example, about 10□ to about 20□. When the thickness of the electron blocking layer 130 is within this range, excellent electron blocking characteristics may be achieved.

The hole mobility of the electron blocking layer 130 may be in a range of about 10⁻²cm²/Vs to about 10²cm²/Vs. The foregoing hole mobility range may be higher than the hole mobility of an electron blocking layer (e.g., an electron blocking layer including an organic material) not including the metal halide, the metal oxide, or any combination thereof (e.g., about 10⁻³cm²/Vs to about 10⁻⁴cm²/Vs). Due to the high hole mobility, characteristics of hole injection into the emission layer 150 may be better, leading to enhancing the probability of recombination of electrons and holes in the emission layer 150. Thus, an organic light-emitting device having the above described electron blocking layer 130 including the metal halide, the metal oxide, or any combination thereof may exhibit high efficiency.

In an exemplary embodiment of the present invention, in the organic light-emitting device 10, the first electrode 110 may be an anode, the second electrode 190 may be a cathode, a hole transport region may be included between the anode and the electron blocking layer 130, and the electron blocking layer 130 may directly contact the hole transport region and the emission layer 150.

According to an exemplary embodiment of the present invention, in the organic light-emitting device 10, the first electrode 110 may be an anode, the second electrode 190 may be a cathode, a hole transport region may be included between the anode and the electron blocking layer 130, and the hole transport region may include at least one selected from a hole injection layer, a hole transport layer, and a buffer layer.

The hole transport region may have a single-layered structure formed of a single material, a single-layered structure formed of a plurality of different materials, or a multi-layered structure including a plurality of layers formed of a plurality of different materials. For example, the hole transport region may have a single-layered structure including a plurality of different materials, or may have a hole injection layer/hole transport layer structure, a hole injection layer/hole transport layer/buffer layer structure, a hole injection layer/buffer layer structure, or a hole transport layer/buffer layer structure, wherein layers of each structure are sequentially stacked from the first electrode 110 in the stated order, but exemplary embodiments are not limited thereto.

The electron blocking layer 130 may directly contact at least one selected from the hole injection layer, the hole transport layer, and the buffer layer.

According to an exemplary embodiment of the present invention, the electron blocking layer 130 may directly contact the hole transport layer.

Because the organic light-emitting device 10 includes the electron blocking layer 130, carriers may accumulate at an interface between layers, e.g., an interface between a hole transport layer and an emission layer, which results in forming a strong electric field. This may suppress denaturation of materials, thus contributing to enhancing the durability and lifespan characteristics of the organic light-emitting device 10.

When the hole transport region includes a hole injection layer, the hole injection layer may be formed on the first electrode 110 by using one or more suitable methods selected from vacuum deposition, spin coating, casting, langmuir-blodgett (LB) deposition, ink-jet printing, laser-printing, and laser-induced thermal imaging (LITI).

When a hole injection layer is formed by vacuum deposition, for example, the vacuum deposition may be performed at a deposition temperature of about 1000□ to about 500□, at a vacuum degree of about 10⁻⁸torr to about 10⁻³torr, and at a deposition rate of about 0.01 □/sec to about 100 □/sec by taking into account the compound for the hole injection layer to be deposited and the structure of a hole injection layer to be formed.

When a hole injection layer is formed by spin coating, the spin coating may be performed at a spin speed of about 2,000 revolutions per minute (rpm) to about 5,000 rpm and at a baking temperature of about 80□ to 200□ by taking into account the compound for the hole injection layer to be deposited and the structure of the hole injection layer to be formed.

Methods of forming the hole transport layer, the buffer layer, and the electron blocking layer 130 may be the same as that of forming a hole injection layer.

The hole transport region may include at least one selected from m-MTDATA, TDATA, 2-TNATA, NPB, β-NPB, TPD, spiro-TPD, spiro-NPB, methylated-NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenyl amine (TCTA), polyaniline/dodecylbenzenesulfonic acid (Pani/CSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (Pani/CSA), (polyaniline)/poly(4-styrene sulfonate) (Pani/PSS), a compound represented by Formula 201, and a compound represented by Formula 202, in which some structures are shown below:

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wherein, in Formulae 201 and 202,

L₂₀₁to L₂₀₅may each independently be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,

xa1 to xa4 may each independently be selected from 0, 1, 2, and 3,

xa5 may be selected from 1, 2, 3, 4, and 5, and

R₂₀₁to R₂₀₄may each independently be selected from a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀arylthio group, a substituted or unsubstituted C₁-C₆₀heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group.

In an exemplary embodiment of the present invention, in Formulae 201 and 202,

L₂₀₁to L₂₀₅may each independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, a spiro-fluorenylene group, a benzofluorene group, a dibenzofluorene group, a phenanthrenylene group, an anthracenylene group, a pyrenylene group, a chrysenylene group, a pyridinylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, a quinolinyiene group, an isoquinolinylene group, a quinoxalinylene group, a quinazolinylene group, a carbazolylene group, and a triazinylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, a spiro-fluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenanthrenylene group, an anthracenylene group, a pyrenylene group, a chrysenylene group, a pyridinylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, a quinolinylene group, an isoquinolinylene group, a quinoxalinylene group, a quinazolinylene group, a carbazolylene group, and a triazinylene 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group,

xa1 to xa4 may each independently be selected from 0, 1, and 2,

xa5 may be selected from 1, 2, and 3, and

R₂₀₁to R₂₀₄may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, an azulenyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group, but exemplary embodiments are not limited thereto.

The compound represented by Formula 201 may be represented by Formula 201A:

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In an exemplary embodiment of the present invention, the compound represented by Formula 201 may be represented by Formula 201A-1, but embodiments are not limited thereto:

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In an exemplary embodiment of the present invention, the compound represented by Formula 202 may be represented by Formula 202A, but embodiments are not limited thereto:

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wherein, in Formulae 201A, 201A-1, and 202A, L₂₀₁to L₂₀₃, xa1 to xa3, xa5, and R₂₀₂to R₂₀₄may be the same as those described above in connection with Formulae 201 and 202; R₂₁₁and R₂₁₂may be the same as described herein in connection with R₂₀₃; and R₂₁₃to R₂₁₆may each independently be 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-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group.

In an exemplary embodiment of the present invention, in Formulae 201A, 201A-1, and 202A,

L₂₀₁to L₂₀₃may each independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, a spiro-fluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenanthrenylene group, an anthracenylene group, a pyrenylene group, a chrysenylene group, a pyridinylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, a quinolinylene group, an isoquinolinylene group, a quinoxalinylene group, a quinazolinylene group, a carbazolylene group, and a triazinylene 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group,

xa1 to xa3 may each independently be selected from 0 and 1,

R₂₀₃, R₂₁₁, and R₂₁₂may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group,

R₂₁₃and R₂₁₄may each independently be selected from:

a C₁-C₂₀alkyl group and a C₁-C₂₀alkoxy group;

a C₁-C₂₀alkyl group and a C₁-C₂₀alkoxy 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 phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group, and

R₂₁₅and R₂₁₆may each independently be 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-C₂₀alkyl group, and a C₁-C₂₀alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group, and

xa5 may be selected from 1 and 2.

R₂₁₃and R₂₁₄in Formulae 201A and 201A-1 may be bound to form a saturated ring or an unsaturated ring.

The compound represented by Formula 201 and the compound represented by Formula 202 may each include compounds HT1 to HT20 illustrated below, but are not limited thereto:

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The thickness of the hole transport region may be in a range of about 100□ to about 10,000□, for example, about 100□ to about 1,000□. When the hole transport region includes a hole injection layer and a hole transport layer, the thickness of the hole injection layer may be in a range of about 100□ to about 10,000□, for example, about 100□ to about 1,000□, and the thickness of the hole transport layer may be in a range of about 50□ to about 2,000□, for example, about 100□ to about 1,500□.

When the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer are within any of these ranges described above, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.

The hole transport region may further include, in addition to above described materials, a charge-generation material for the enhancement of the conductivity properties. The charge-generation material may be homogeneously or non-homogeneously dispersed in the hole transport region.

The charge-generation material may be, for example, a p-dopant. The p-dopant may be selected from a quinone derivative and a cyano group-containing compound, but exemplary embodiments are not limited thereto. Non-limiting examples of the p-dopant may include quinone derivatives, such as tetracyanoquinonedimethane (TCNQ) or 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); and Compound HT-D1, but exemplary embodiments are not limited thereto:

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The hole transport region may further include, in addition to the hole injection layer and the hole transport layer, a buffer layer. Since the buffer layer may compensate for an optical resonance distance depending on a wavelength of light emitted from the emission layer, the light-emission efficiency of a formed organic light-emitting device may be enhanced. Any of the materials included in the hole transport region may be included in the buffer layer.

The emission layer 150 may be formed on the electron blocking layer 130 by using one or more suitable methods, such as, for example, vacuum-deposition, spin coating, casting, LB deposition, ink-jet printing, laser-printing, or LITI. When an emission layer is formed by vacuum deposition or spin coating, deposition and coating conditions for the emission layer may be the same as those for the hole injection layer.

When the organic light-emitting device 10 is a full color organic light-emitting device, the emission layer 150 may be patterned into a red emission layer, a green emission layer, or a blue emission layer, according to a sub-pixel. In an exemplary embodiment of the present invention, the emission layer may have a stacked structure including a red emission layer, a green emission layer, and a blue emission layer, or may have a single layer structure including a red-light emission material, a green-light emission material, and a blue-light emission material mixed together, to thereby emit white light.

The emission layer 150 may include a host and a dopant.

In an exemplary embodiment of the present invention, the host of the emission layer 150 may include a compound represented by Formula 301:

Ar₃₀₁-[(L₃₀₁)_xb1-R₃₀₁]_xb2 Formula 301

wherein, in Formula 301,

Ar₃₀₁may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, a benzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, an anthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, naphthacene, a picene, a perylene, a pentaphene, and an indenoanthracene, 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, a terphenyl group, and —Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃), wherein Q₃₀₁to Q₃₀₃may each independently be selected from hydrogen, a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₆-C₆₀aryl group, and a C₁-C₆₀heteroaryl group,

L₃₀₁may be the same as described herein in connection with L₂₀₁,

R₃₀₁may be selected from:

a C₁-C₂₀alkyl group and a C₁-C₂₀alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, and a triazinyl group,

xb1 may be selected from 0, 1, 2, and 3, and

xb2 may be selected from 1, 2, 3, and 4.

In an exemplary embodiment of the present invention, in Formula 301,

L₃₀₁may be selected from:

R₃₀₁may be selected from:

a C₁-C₂₀alkyl group and a C₁-C₂₀alkoxy group;

a C₁-C₂₀alkyl group and a C₁-C₂₀alkoxy group, each substituted with at least one 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 phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, and a chrysenyl group;

In an exemplary embodiment of the present invention, the host of the emission layer 150 may include a compound represented by Formula 301A:

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Substituents of Formula 301A may be the same as those described herein in connection therewith.

The compound represented by Formula 301 may include at least one compound selected from Compounds H1 to H42, but exemplary embodiments are not limited thereto:

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In an exemplary embodiment of the present invention, the host of the emission layer 150 may include at least one selected from Compounds H43 to H49, but exemplary embodiments are not limited thereto:

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In an exemplary embodiment of the present invention, the host of the emission layer 150 may include at least one selected from the compounds shown below, but exemplary embodiments are not limited thereto:

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In an exemplary embodiment of the present invention, the host of the emission layer 150 may be represented by Formula 50 or 51:

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wherein, in Formulae 50 and 51,

A₁may be CR₁₁or N, A₂may be CR₁₂or N, A₃may be CR₁₃or N, A₄may be CR₁₄or N, A₅may be CR₁₅or N, A₆may be CR₁₆or N, A₇may be CR₁₇or N, A₈may be CR₁₈or N, A₉may be CR₁₉or N, A₁₀may be CR₂₀or N, A₁₁may be CR₂₁or N, A₁₂may be CR₂₂or N, A₁₃may be CR₂₃or N, A₁₄may be CR₂₄or N, A₁₆may be CR₂₅or N, A₁₆may be CR₂₆or N, A₁₇may be CR₂₇or N, A₁₈may be CR₂₈or N, A₁₉may be CR₂₉or N, A₂₀may be CR₃₀or N, A₂₁may be CR₃₁or N, A₂₂may be CR₃₂or N, A₂₃may be CR₃₃or N, A₂₄may be CR₃₄or N,

B₁and B₂rings may each independently be selected from a benzene, a pyridine, a pyrimidine, a pyrazine, a naphthalene, a quinoline, an isoquinoline, a quinoxaline, a quinazoline, a cinnoline, a fluorene, a carbazole, a dibenzofuran, and a dibenzothiophene,

X may be selected from —C(R₄₀)(R₄₁)—, —N(R₄₂)—, —S—, —O—, —Si(R₄₃)(R₄₄)—, —P(R₄₅)—, —P(═O)(R₄₆)—, and —B(R₄₇)—,

Ar₁may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,

R₁₁to R₃₆and R₄₀to R₄₇may each independently be 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-C₆₀alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀alkynyl group, a substituted or unsubstituted C₁-C₆₀alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀arylthio group, a substituted or unsubstituted C₁-C₆₀heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(O₂), —Si(Q₃)(Q₄)(Q₅), and —B(Q₆)(Q₇),

e and f1 may each independently be an integer selected from 0 to 2,

f2 and f3 may each independently be an integer selected from 0 to 7, and

at least one of substituents of the substituted C₃-C₁₀cycloalkylene group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀cycloalkenylene group, substituted C₁-C₁₀heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀heteroarylene group, substituted divalent non-aromatic condensed polycyclic group, substituted divalent non-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀alkyl group, substituted C₂-C₆₀alkenyl group, substituted C₂-C₆₀alkynyl group, substituted C₁-C₆₀alkoxy group, substituted C₃-C₁₀cycloalkyl group, substituted C₁-C₁₀heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀heterocycloalkenyl group, substituted C₆-C₆₀aryl group, substituted C₆-C₆₀aryloxy group, substituted C₆-C₆₀arylthio group, substituted C₁-C₆₀heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group may be 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-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₅₀alkoxy group;

a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₆₀alkoxy 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-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), a biphenyl group, and a terphenyl group;

a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₃cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(C₂₇), a biphenyl group, and a terphenyl group; and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), and —B(Q₃₆)(Q₃₇), wherein Q₁to Q₇, Q₁₁to Q₁₇, Q₂₁to Q₂₇, and Q₃₁to Q₃₇may each independently be 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-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₃alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group.

According to an exemplary embodiment of the present invention,

at least one selected from A₁₅to A₁₉in Formula 50 may be N, at least one selected from A₂₀to A₂₄in Formula 51 may be N,

B₁and B₂rings in Formula 51 may each independently be selected from a benzene, a fluorene, a dibenzofuran, and a dibenzothiophene,

Ar₁in Formulae 50 and 51 may be selected from:

a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an indacenylene group, an acenaphthylene group, a fluorenylene group, a spiro-fluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, a pentaphenylene group, a hexacenylene group, a pentacenylene group, a rubicenylene group, a coronenylene group, an ovalenylene group, a pyrrolylene group, a thiophenylene group, a furanylene group, an imidazolylene group, a pyrazolylene group, a thiazolylene group, an isothiazolylene group, an oxazolylene group, an isoxazolylene group, a pyridinylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, an isoindolylene group, an indolylene group, an indazolylene group, a purinylene group, a quinolinylene group, an isoquinolinylene group, a benzoquinolinylene group, a phthalazinylene group, a naphthyridinylene group, a quinoxalinylene group, a quinazolinylene group, a cinnolinylene group, a carbazolylene group, a phenanthridinylene group, an acridinylene group, a phenanthrolinylene group, a phenazinylene group, a benzimidazolylene group, a benzofuranylene group, a benzothiophenylene group, an isobenzothiazolylene group, a benzoxazolylene group, an isobenzoxazolylene group, a triazolylene group, a tetrazolylene group, an oxadiazolylene group, a triazinylene group, a dibenzofuranylene group, a dibenzothiophenylene group, a benzocarbazolylene group, a dibenzocarbazolylene group, a thiadiazolylene group, an imidazopyridinylene group, and an imidazopyrimidinylene 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl 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 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 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 carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl 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, a thiadiazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group, and

R₁₁to R₃₆and R₄₀to R₄₇may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl 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 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 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 carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl 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, a dibenzosilolyl group, a thiadiazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl 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 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 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 carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl 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, a thiadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, and —Si(Q₃₃)(Q₃₄)(Q₃₅),

wherein Q₃₃to Q₃₅may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl 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, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a thiadiazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group, but embodiments are not limited thereto.

In an exemplary embodiment of the present invention, the host may include a compound represented by one of the formulae below, but exemplary embodiments are not limited thereto:

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The dopant in the emission layer 150 may include a phosphorescent dopant or a fluorescent dopant.

The phosphorescent dopant may include an organometallic complex represented by Formula 401:

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wherein, in Formula 401,

M may be selected from Ir, Pt, Os, Ti, Zr, Hf, europium (Eu), terbium (Tb), and thulium (Tm),

X₄₀₁to X₄₀₄may each independently be nitrogen or carbon,

A₄₀₁and A₄₀₂rings may each independently be selected from a substituted or unsubstituted benzene, a substituted or unsubstituted naphthalene, a substituted or unsubstituted fluorene, a substituted or unsubstituted spiro-fluorene, a substituted or unsubstituted indene, a substituted or unsubstituted pyrrole, a substituted or unsubstituted thiophene, a substituted or unsubstituted furan, a substituted or unsubstituted imidazole, a substituted or unsubstituted pyrazole, a substituted or unsubstituted thiazole, a substituted or unsubstituted isothiazole, a substituted or unsubstituted oxazole, a substituted or unsubstituted isoxazole, a substituted or unsubstituted pyridine, a substituted or unsubstituted pyrazine, a substituted or unsubstituted pyrimidine, a substituted or unsubstituted pyridazine, a substituted or unsubstituted quinoline, a substituted or unsubstituted isoquinoline, a substituted or unsubstituted benzoquinoline, a substituted or unsubstituted quinoxaline, a substituted or unsubstituted quinazoline, a substituted or unsubstituted carbazole, a substituted or unsubstituted benzimidazole, a substituted or unsubstituted benzofuran, a substituted or unsubstituted benzothiophene, a substituted or unsubstituted isobenzothiophene, a substituted or unsubstituted benzoxazole, a substituted or unsubstituted isobenzoxazole, a substituted or unsubstituted triazole, a substituted or unsubstituted oxadiazole, a substituted or unsubstituted triazine, a substituted or unsubstituted dibenzofuran, and a substituted or unsubstituted dibenzothiophene,

at least one of substituents of the substituted benzene, substituted naphthalene, substituted fluorene, substituted spiro-fluorene, substituted indene, substituted pyrrole, substituted thiophene, substituted furan, substituted imidazole, substituted pyrazole, substituted thiazole, substituted isothiazole, substituted oxazole, substituted isoxazole, substituted pyridine, substituted pyrazine, substituted pyrimidine, substituted pyridazine, substituted quinoline, substituted isoquinoline, substituted benzoquinoline, substituted quinoxaline, substituted quinazoline, substituted carbazole, substituted benzimidazole, substituted benzofuran, substituted benzothiophene, substituted isobenzothiophene, substituted benzoxazole, substituted isobenzoxazole, substituted triazole, substituted oxadiazole, substituted triazine, substituted dibenzofuran, and substituted dibenzothiophene may be selected from:

a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, and a C₁-C₅₀alkoxy 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-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₄₀₁)(Q₄₀₂), —Si(Q₄₀₃)(Q₄₀₄)(Q₄₀₅), —B(Q₄₀₆)(Q₄₀₇), a biphenyl group, and a terphenyl group;

a C₃-C₁₀cycloalkyl group, a C₁-C₁₀, heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group;

a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₄₁₁)(Q₄₁₂), —Si(Q₄₁₃)(Q₄₁₄)(Q₄₁₅), —B(Q₄₁₆)(Q₄₁₇), a biphenyl group, and a terphenyl group; and

—N(Q₄₂₁)(Q₄₂₂), —Si(Q₄₂₃)(Q₄₂₄)(Q₄₂₅); and —B(Q₄₂₆)(Q₄₂₇),

L₄₀₁may be an organic ligand,

xc1 may be selected from 1, 2, and 3, and

xc2 may be selected from 0, 1, 2, and 3,

wherein Q₄₀₁to Q₄₀₇, Q₄₁₁to Q₄₁₇, and Q₄₂₁to Q₄₂₇may each independently be selected from hydrogen, a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₆-C₆₀aryl group, and a C₂-C₆₀heteroaryl group.

L₄₀₁may be any suitable monovalent, divalent, or trivalent organic ligand. For example, L₄₀₁may be selected from: a halogen ligand, e.g., Cl or F; a diketone ligand, e.g., acetylacetonate, 1,3-diphenyl-1,3-propanedionate, 2,2,6,6-tetramethyl-3,5-heptanedionate, or hexafluoroacetonate; a carboxylic acid ligand, e.g., picolinate, dimethyl-3-pyrazolecarboxylate, or benzoate; a carbon monoxide ligand; an isonitrile ligand; a cyano ligand; and a phosphorous ligand, e.g., phosphine or phosphite, but exemplary embodiments are not limited thereto.

When A₄₀₁in Formula 401 includes a plurality of substituents, the plurality of substituents of A₄₀₁may be bound to each other to form a saturated or unsaturated ring.

When A₄₀₂in Formula 401 includes a plurality of substituents, the plurality of substituents of A₄₀₂may be bound to each other to form a saturated or unsaturated ring.

When xc1 in Formula 401 is 2 or greater, a plurality of ligands

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in Formula 401 may be identical to or different from each other. In Formula 401, when xc1 is 2 or greater, A₄₀₁and A₄₀₂of one ligand may be each connected to A₄₀₁and A₄₀₂of another adjacent ligand, respectively, either directly or via a linking group (e.g., a C₁-C₅alkylene group, —N(R′)— (where R′ is a C₁-C₁₀alkyl group or a C₆-C₂₀aryl group), or —C(═O)—).

The phosphorescent dopant may include, for example, at least one selected from Compounds PD1 to PD75, but exemplary embodiments are not limited thereto:

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In an exemplary embodiment of the present invention, the fluorescent dopant may include a compound represented by Formula 501:

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wherein, in Formula 501,

Ar₅₀₁may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, a benzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, an anthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, naphthacene, a picene, a perylene, a pentaphene, and an indenoanthracene, 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₂-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₅₀arylthio group, a C₂-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, a terphenyl group, and −Si(Q₅₀₁)(C₅₀₂)(Q₅₀₃), wherein Q₅₀₁to Q₅₀₃may each independently be selected from hydrogen, a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₆-C₆₀aryl group, and a C₂-C₆₀heteroaryl group,

L₅₀₁to L₅₀₃may be the same as described herein in connection with L₂₀₁,

R₅₀₁and R₅₀₂may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,

xd1 to xd3 may each independently be selected from 0, 1, 2, and 3, and

xd4 may be selected from 1, 2, 3, and 4.

The amount of the dopant in the emission layer 150 may be in a range of about 0.01 parts by weight to about 15 parts by weight based on 100 parts by weight of the host, but is not limited thereto.

The thickness of the emission layer 150 may be in a range of about 100□ to about 1,000□, and in an exemplary embodiment of the present invention, may be in a range of about 200□ to about 600□. When the thickness of the emission layer 150 is within these ranges, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.

In an exemplary embodiment of the present invention, the fluorescent dopant may be selected from the following compounds, but is not limited thereto:

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The electron transport region 170 may be disposed on the emission layer 150.

The electron transport region 170 may include at least one selected from a hole blocking layer, an electron transport layer, and an electron injection layer. The methods of forming the hole blocking layer, the electron transport layer, and the electron injection layer may be understood by referring to the method used to form the hole injection layer.

The electron transport region may have an electron transport layer/electron injection layer structure or a hole blocking layer/electron transport layer/electron injection layer structure, wherein layers of each structure are sequentially stacked from the emission layer 150 in the stated order, but the structure thereof is not limited thereto.

In an exemplary embodiment of the present invention, the electron transport layer may include at least one compound selected from a compound represented by Formula 601 and a compound represented by Formula 602, in which Formula 601 is shown below:

Ar₆₀₁-[(L₆₀₁)_xe1-E₆₀₁]_xe2 Formula 601

wherein, in Formula 601,

Ar₆₀₁may be selected from:

a naphthalene, a heptalene, a fluorene, a spiro-fluorene, a benzofluorene, a dibenzofluorene, a phenalene, a phenanthrene, an anthracene, a fluoranthene, a triphenylene, a pyrene, a chrysene, naphthacene, a picene, a perylene, a pentaphene, and an indenoanthracene, 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 C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, a terphenyl group, and —Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃), wherein Q₃₀₁to C₃₀₃may each independently be selected from hydrogen, a C₁-C₆₀alkyl group, a C₂-C₆₀alkenyl group, a C₆-C₆₀aryl group, or a C₁-C₆₀heteroaryl group,

L₆₀₁may be the same as described herein in connection with L₂₀₁,

E₆₀₁may be selected from:

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 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 carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl 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, an imidazopyridinyl group, and an imidazopyrimidinyl 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 C₁-C₂₀alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl 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 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 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 carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl 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, an imidazopyridinyl group, and an imidazopyrimidinyl group,

xe1 may be selected from 0, 1, 2, and 3, and

xe2 may be selected from 1, 2, 3, and 4.

Formula 602 is shown below:

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wherein, in Formula 602,

X₆₁₁may be N or C-(L₆₁₁)_xe611-R₆₁₁, X₆₁₂may be N or C-(L₆₁₂)_xe612-R₆₁₂, X₆₁₃may be N or C-(L₆₁₃)_xe613-R₆₁₃, and at least one selected from X₆₁₁to X₆₁₃may be N,

L₆₁₁to L₆₁₆may be the same as described herein in connection with L₂₀₁,

R₆₁₁to R₆₁₆may each independently be selected from:

xe611 to xe616 may each independently be selected from 0, 1, 2, and 3. The compound represented by Formula 601 and the compound represented by Formula 602 may each independently be selected from Compounds ET1 to ET15:

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In an exemplary embodiment of the present invention, the electron transport layer may include at least one selected from BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), Bphen (4,7-diphenyl-1,10-phenanthroline), Alq₃, BAlq, TAZ, and NTAZ:

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The thickness of the electron transport layer may be in a range of about 100□ to about 1,000□, and in an exemplary embodiment of the present invention, may be in a range of about 150□ to about 500□. When the thickness of the electron transport layer is within these ranges, excellent electron transport characteristics may be achieved without a substantial increase in driving voltage.

In addition to the materials described above, the electron transport layer may further include a metal-containing material.

The metal-containing material may include a Li complex. The Li complex may include, e.g., Compound ET-D1 (lithium quinolate, LiQ) or ET-D2:

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The electron transport region may include an electron injection layer that facilitates electron injection from the second electrode 190.

The electron injection layer may be formed on the electron transport layer by using one or more suitable methods selected from vacuum deposition, spin coating, casting, LB deposition, ink-jet printing, laser-printing, and LITI. When an electron injection layer is formed by vacuum deposition or spin coating, deposition and coating conditions for the electron injection layer may be the same as those for the hole injection layer.

The electron injection layer may include at least one selected from LiF, NaCl, CsF, Li₂O, BaO, and LiQ.

The thickness of the electron injection layer may be in a range of about 1□ to about 100□, and in an exemplary embodiment of the present invention, may be in a range of about 3□ to about 90□. When the thickness of the electron injection layer is within these ranges, the electron injection layer may have satisfactory electron injection characteristics without a substantial increase in driving voltage.

The second electrode 190 may be disposed on the electron transport region 170. The second electrode 190 may be a cathode which is an electron injection electrode, and in this regard, a material for forming the second electrode 190 may be selected from a metal, an alloy, an electrically conductive compound, and a mixture thereof, which have a relatively low work function. Examples of the second electrode 190 may include lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag). In an exemplary embodiment of the present invention, the material for forming the second electrode 190 may be ITO or IZO. The second electrode 190 may be a semi-transmissive electrode or a transmissive electrode.

FIG. 2 is a diagram illustrating the work functions of first and second electrodes, and the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) levels of each of a hole injection layer NIL, a hole transport layer HTL, an electron blocking layer EBL, an emission layer EML, an electron transport layer ETL, and an electron injection layer EIL.

The actually measured LUMO value of the electron blocking layer EBL may be greater than that of a host in the emission layer EML.

In an exemplary embodiment of the present invention, a difference between the actually measured LUMO value of the electron blocking layer EBL and the actually measured LUMO value of the host in the emission layer EML may be in a range of about 0.3 electron volts (eV) to about 2.0 eV.

When the difference between the actually measured LUMO value of the electron blocking layer EBL and that of the host in the emission layer EML is within this range described above, electrons injected from the second electrode can be prevented from passing through the emission layer EML followed by leaking of the electrons toward the first electrode. Correspondingly, electrons may be more prone to be in the emission layer EML, resulting in enhancement of emission characteristics.

According to an exemplary embodiment of the present invention, the actually measured LUMO value of the electron blocking layer EBL may be in a range of about −2.7 eV to about −1.0 eV, and the actually measured LUMO value of the host of the emission layer EML may be in a range of about −3.0 eV to about −2.0 eV.

In an exemplary embodiment of the present invention, the actually measured LUMO value of a dopant may be in a range of about −3.2 eV to about −2.2 eV.

The actually measured HOMO value of the electron blocking layer EBL may be lower than the actually measured value of the work function of the first electrode and greater than the actually measured HOMO value of the emission layer EML. The actually measured HOMO value of the electron blocking layer EBL may be close to the work function of the first electrode, the actually measured HOMO value of the emission layer EML, and the actually measured HOMO value of the hole transport region, so as to assist in hole transporting. When the actually measured HOMO value of the electron blocking layer EBL meets this condition, migration of holes from the first electrode to the emission layer EML may be facilitated.

As described above, the organic light-emitting device may have enhanced efficiency and long lifespan.

It should be understood that the exemplary embodiments of the present invention described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.

While specific embodiments of the present invention have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.

Number	Name	Date	Kind
8866128	Cho et al.	Oct 2014	B2
20040048101	Thompson et al.	Mar 2004	A1
20060042685	Wang	Mar 2006	A1
20090001878	Qiu et al.	Jan 2009	A1
20090206741	Yoon et al.	Aug 2009	A1
20100253212	Cheng	Oct 2010	A1
20110303901	Cheng et al.	Dec 2011	A1
20120098079	Suzuki	Apr 2012	A1
20170117477	D'Lavari	Apr 2017	A1

Number	Date	Country
1020060012120	Feb 2006	KR
1020080015356	Feb 2008	KR
1020080090350	Oct 2008	KR

Organic light-emitting device

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