HETEROCYCLE COMPOUND, ORGANIC LIGHT-EMPLOYING DEVICE WITH THE HETEROCYCLE COMPOUND AND ELECTRONIC DEVICE WITH THE ORGANIC LIGHT-EMPLOYING DEVICE

Description

FIELD OF THE INVENTION

[0001] The present disclosure relates to heterocyclic compounds, organic light-emitting devices including the heterocyclic compounds, and electronic apparatuses including the organic light-emitting devices.BACKGROUND OF THE INVENTION

[0002] Organic light-emitting devices are self-emissive devices that produce full-color images, and also have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of luminance, driving voltage, and response speed, compared to devices in the art.

[0003] In an example, an organic light-emitting device includes an anode, a cathode, and an organic layer arranged between the anode and the cathode and including an emission layer. A hole transport region may be arranged between the anode and the emission layer, and an electron transport region may be arranged between the emission layer and the cathode. Holes provided from the anode may move toward the emission layer through the hole transport region, and electrons provided from the cathode may move toward the emission layer through the electron transport region. The holes and the electrons recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state, thereby generating light. Fused polycyclic organoboranes used for OLEDs are disclosed in CN 113072571A.SUMMARY OF THE INVENTION

[0004] Provided are heterocyclic compounds, organic light-emitting devices including the heterocyclic compounds, and electronic apparatuses including the organic light-emitting devices.

[0005] Additional aspects will be set forth in part in the description, which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0006] According to an aspect of an embodiment, provided is a heterocyclic compound represented by Formula 1-1 or 1-2: In Formulae 1-1 and 1-2, A 11 to A 16 are each independently a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, X 11 to X 16 are each independently a group represented by Formula 2-1 or 2-2, n11 to n16 are each independently 0, 1, or 2, the sum of n11 to n16 in Formula 1-1 is 1 or more, and the sum of n11 to n15 in Formula 1-2 is 1 or more, Y 11 to Y 16 are each independently a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, or a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, m11 to m16 are each independently 0, 1, or 2, the sum of n11 to n16 and m11 to m16 in Formula 1-1 is 2 or more, the sum of n11 to n15 and m11 to m15 in Formula 1-2 is 2 or more, Z 11 to Z 16 are each independently a carbon atom, and a bond between Z 11 and Z 12 , a bond between Z 13 and Z 14 , and a bond between Z 15 and Z 16 are each independently a single bond or a double bond, wherein, in Formulae 2-1 and 2-2, X 21 is a single bond, O, S, N(R 25 ), or C(R 25 )(R 26 ), L 21 and L 22 are each independently a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, a21 and a22 are each independently 0, 1, or 2, R 21 and R 22 are each independently a substituted or unsubstituted C 6 -C 60 aryl group, R 11 to R 18 and R 23 to R 26 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted C 2 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - Si(Q 1 )(Q 2 )(Q 3 ), -C(Q 1 )(Q 2 )(Q 3 ), -B(Q 1 )(Q 2 ), -N(Q 1 )(Q 2 ), -P(Q 1 )(Q 2 ), -C(=O)(Q 1 ), -S(=O)(Q 1 ), -S(=O) 2 (Q 1 ), -P(=O)(Q 1 )(Q 2 ), or -P(=S)(Q 1 )(Q 2 ), b11 to b16 are each independently 0, 1, 2, or 3, b23 and b24 are each independently 0, 1, 2, 3, or 4, Q 1 to Q 3 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 7 -C 60 alkylaryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a C 2 -C 60 alkylheteroaryl group, a C 1 -C 60 heteroaryloxy group, a C 1 -C 60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group that is substituted with at least one deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof, or a C 6 -C 60 aryl group that is substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof, and * indicates a binding site to a neighboring atom and,the substituted C5 -C30 carbocyclic group, the substituted C1 -C30 heterocyclic group, the substituted C1 -C60 alkyl group, the substituted C2 -C60 alkenyl group, the substituted C2 -C60 alkynyl group, the substituted C1 -C60 alkoxy group, the substituted C3 -C10 cycloalkyl group, the substituted C1 -C10 heterocycloalkyl group, the substituted C3 -C10 cycloalkenyl group, the substituted C1 -C10 heterocycloalkenyl group, the substituted C6 -C60 aryl group, the substituted C7 -C60 alkylaryl group, the substituted C6 -C60 aryloxy group, the substituted C6 -C60 arylthio group, the substituted C1 -C60 heteroaryl group, the substituted C2 -C60 alkylheteroaryl group, the substituted C1 -C60 heteroaryloxy group, the substituted C1 -C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group are substituted with:deuterium, -F, -CI, -Br, -I, -CD3 , -CD2 H, -CDH2 , -CF3 , -CF2 H, -CFH2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, or a C1 -C60 alkoxy group;a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, or a C1 -C60 alkoxy group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3 ,-CD2 H, -CDH2 , -CF3 , - CF2 H, -CFH2 , 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic 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 ), -P(=O)(Q18 )(Q19 ), or any combination thereof;a C3 -C10 cycloalkyl group, a C1 -C10 heterocycloalkyl group, a C3 - C10 cycloalkenyl group, a C1 -C10 heterocycloalkenyl group, a C6 -C60 aryl group, a C6 - C60 aryloxy group, a C6 -C60 arylthio group, a C1 -C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, or 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2 H, -CDH2 , -CF3 , -CF2 H, -CFH2 , 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -N(Q21 )(Q22 ), -Si(Q23 ) (Q24 )(Q25 ), -B(Q26 )(Q27 ), - P(=O)(Q28 )(Q29 ), or any combination thereof; or-N(Q31 ) (Q32 ), -Si(Q33 )(Q34 )(Q35 ), -B(Q36 )(Q37 ), or -P(=O)(Q38 )(Q39 ), andQ11 to Q19, Q21 to Q29, and Q31 to Q39 are each independently hydrogen, deuterium, -F, -CI, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, a C1 -C60 alkoxy group, a C3 -C10 cycloalkyl group, a C1 -C10 heterocycloalkyl group, a C3 -C10 cycloalkenyl group, a C1 -C10 heterocycloalkenyl group, a C6 -C60 aryl group, a C6 -C60 aryl group substituted with at least one a C1 -C60 alkyl group, and a C6 -C60 aryl group, a C6 -C60 aryloxy group, a C6 -C60 arylthio group, a C1 -C60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group.

[0007] According to an aspect of another embodiment, provided is an organic light-emitting device including: a first electrode; a second electrode; and an organic layer arranged between the first electrode and the second electrode and including an emission layer, wherein the organic layer includes the heterocyclic compound.

[0008] According to an aspect of another embodiment, provided is an electronic apparatus including the organic light-emitting device.BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: FIG. 1 shows a schematic cross-sectional view of an organic light-emitting device according to an exemplary embodiment; FIG. 2 is a schematic cross-sectional view of an organic light-emitting device according to another exemplary embodiment; FIG. 3 is a schematic cross-sectional view of an organic light-emitting device according to another exemplary embodiment; and FIGS. 4A to 4E are each diagram illustrating energy levels in an emission layer of an organic light-emitting device according to an exemplary embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout the specification. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects. As used herein, the term "and / or" includes any and all combinations of one or more of the same associated listed items. Expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

[0011] It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present

[0012] It will be understood that, although the terms "first," "second," "third" etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section Thus, "a first element," "component," "region," "layer" or "section" discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.

[0013] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, "a," "an," "the," and "at least one" do not denote a limitation of quantity, and are intended to cover both the singular and plural, unless the context clearly indicates otherwise. For example, "an element" has the same meaning as "at least one element," unless the context clearly indicates otherwise.

[0014] "Or" means "and / or." As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items It will be further understood that the terms "comprises" and / or "comprising," or "includes" and / or "including" when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0015] Furthermore, relative terms, such as "lower" or "bottom" and "upper" or "top," may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements The exemplary term "lower," can therefore, encompasses both an orientation of "lower" and "upper," depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. The exemplary terms "below" or "beneath" can, therefore, encompass both an orientation of above and below.

[0016] "About" or "approximately" as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ± 30%, 20%, 10% or 5% of the stated value.

[0017] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0018] Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and / or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.

[0019] An aspect of the present disclosure provides a heterocyclic compound represented by Formula 1-1 or 1-2:

[0020] In Formulae 1-1 and 1-2, A 11 to A 16 may each independently be a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group.

[0021] In an embodiment, in Formulae 1-1 and 1-2, A 11 to A 16 may each independently be a benzene group, a naphthalene group, a phenanthrene group, a furan group, a thiophene group, a pyrrole group, a cyclopentene group, a silole group, a germole group, a benzofuran group, a benzothiophene group, an indole group, an indene group, a benzosilole group, a benzogermole group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, a dibenzosilole group, or a dibenzogermole group.

[0022] In one or more embodiments, in Formulae 1-1 and 1-2, A 11 to A 16 may each independently be a benzene group, a naphthalene group, a benzofuran group, a benzothiophene group, an indole group, an indene group, a benzosilole group, or a benzogermole group.

[0023] In one or more embodiments, in Formulae 1-1 and 1-2, A 11 to A 16 may each independently be a benzene group or a naphthalene group.

[0024] In one or more embodiments, in Formulae 1-1 and 1-2, A 11 to A 16 may each independently be a benzene group.

[0025] In an embodiment, in Formulae 1-1 and 1-2, X 11 to X 16 may each independently be a group represented by Formula 2-1 or 2-2:

[0026] In Formulae 2-1 and 2-2, X 21 may be a single bond, O, S, N(R 25 ), or C(R 25 )(R 26 ), L 21 and L 22 may each independently be a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, a21 and a22 may each independently be 0, 1, or 2, R 21 and R 22 may each independently be a substituted or unsubstituted C 6 -C 60 aryl group, R 23 to R 26 may each independently be hydrogen, deuterium, -F, -Cl, - Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted C 2 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q 1 )(Q 2 )(Q 3 ), -C(Q 1 )(Q 2 )(Q 3 ), -B(Q 1 )(Q 2 ), -N(Q 1 )(Q 2 ), -P(Q 1 )(Q 2 ), -C(=O)(Q 1 ), -S(=O)(Q 1 ), - S(=O) 2 (Q 1 ), -P(=O)(Q 1 )(Q 2 ), or -P(=S)(Q 1 )(Q 2 ), Q 1 to Q 3 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 7 -C 60 alkylaryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a C 2 -C 60 alkylheteroaryl group, a C 1 -C 60 heteroaryloxy group, a C 1 -C 60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group that is substituted with at least one deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, and a C 6 -C 60 aryl group, and a C 6 -C 60 aryl group that is substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, or a C 6 -C 60 aryl group, b23 and b24 may each independently be 0, 1, 2, 3, or 4, and * indicates a binding site to a neighboring atom, and the substituted C5 -C30 carbocyclic group, the substituted C1 -C30 heterocyclic group, the substituted C1 -C60 alkyl group, the substituted C2 -C60 alkenyl group, the substituted C2 -C60 alkynyl group, the substituted C1 -C60 alkoxy group, the substituted C3 -C10 cycloalkyl group, the substituted C1 -C10 heterocycloalkyl group, the substituted C3 -C10 cycloalkenyl group, the substituted C1 -C10 heterocycloalkenyl group, the substituted C6 -C60 aryl group, the substituted C7 -C60 alkylaryl group, the substituted C6 -C60 aryloxy group, the substituted C6 -C60 arylthio group, the substituted C1 -C60 heteroaryl group, the substituted C2 -C60 alkylheteroaryl group, the substituted C1 -C60 heteroaryloxy group, the substituted C1 -C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group are substituted with:deuterium, -F, -CI, -Br, -I, -CD3 , -CD2 H, -CDH2 , -CF3 , -CF2 H, -CFH2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, or a C1 -C60 alkoxy group;a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, or a C1 -C60 alkoxy group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3 ,-CD2 H, -CDH2 , -CF3 , - CF2 H, -CFH2 , 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic 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 ), -P(=O)(Q18 )(Q19 ), or any combination thereof;a C3 -C10 cycloalkyl group, a C1 -C10 heterocycloalkyl group, a C3 - C10 cycloalkenyl group, a C1 -C10 heterocycloalkenyl group, a C6 -C60 aryl group, a C6 - C60 aryloxy group, a C6 -C60 arylthio group, a C1 -C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, or 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2 H, -CDH2 , -CF3 , -CF2 H, -CFH2 , 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -N(Q21 )(Q22 ), -Si(Q23 ) (Q24 )(Q25 ), -B(Q26 )(Q27 ), - P(=O)(Q28 )(Q29 ), or any combination thereof; or-N(Q31 ) (Q32 ), -Si(Q33 )(Q34 )(Q35 ), -B(Q36 )(Q37 ), or -P(=O)(Q38 )(Q39 ), andQ11 to Q19, Q21 to Q29, and Q31 to Q39 are each independently hydrogen, deuterium, -F, -CI, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1 -C60 alkyl group, a C2 -C60 alkenyl group, a C2 -C60 alkynyl group, a C1 -C60 alkoxy group, a C3 -C10 cycloalkyl group, a C1 -C10 heterocycloalkyl group, a C3 -C10 cycloalkenyl group, a C1 -C10 heterocycloalkenyl group, a C6 -C60 aryl group, a C6 -C60 aryl group substituted with at least one a C1 -C60 alkyl group, and a C6 -C60 aryl group, a C6 -C60 aryloxy group, a C6 -C60 arylthio group, a C1 -C60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group.

[0027] In an embodiment, in Formula 2-2, X 21 may be a single bond.

[0028] In an embodiment, in Formulae 2-1 and 2-2, L 21 and L 22 may each independently be a substituted or unsubstituted C 5 -C 30 carbocyclic group.

[0029] In an embodiment, in Formulae 2-1 and 2-2, a21 and a22 may each independently be 0 or 1.

[0030] In an embodiment, in Formula 2-1, R 21 and R 22 may each independently be a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, or a chrysenyl group, each substituted or unsubstituted with deuterium, -F, -CI, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a deuterated C 2 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a (C 1 -C 20 alkyl)cyclopentyl group, a (C 1 -C 20 alkyl)cyclohexyl group, a (C 1 -C 20 alkyl)cycloheptyl group, a (C 1 -C 20 alkyl)cyclooctyl group, a (C 1 -C 20 alkyl)adamantanyl group, a (C 1 -C 20 alkyl)norbornanyl group, a (C 1 -C 20 alkyl)norbornenyl group, a (C 1 -C 20 alkyl) cyclopentenyl group, a (C 1 -C 20 alkyl)cyclohexenyl group, a (C 1 -C 20 alkyl)cycloheptenyl group, a (C 1 -C 20 alkyl)bicyclo[1.1.1]pentyl group, a (C 1 -C 20 alkyl)bicyclo[2.1.1]hexyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.1]heptyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, or any combination thereof.

[0031] In one or more embodiments, in Formula 2-1, R 21 and R 22 may each independently be hydrogen, deuterium, -F, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, - CFH 2 , a C 2 -C 10 alkenyl group, a C 1 -C 10 alkoxy group, a C 1 -C 10 alkylthio group, a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130, a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130 in which at least one hydrogen is substituted with deuterium group, or a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130 in which at least one hydrogen is substituted with -F:

[0032] In Formulae 10-12 to 10-23 and 10-38 to 10-130, "Ph" represents a phenyl group, and * indicates a binding site to a neighboring atom.

[0033] In an embodiment, in Formula 2-2, R 23 to R 26 may each independently be: 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, -SF 5 , a C 1 -C 20 alkyl group, a C 1 -C 20 alkenyl group, a C 1 -C 20 alkoxy group, or a C 1 -C 20 alkylthio group; a C 1 -C 20 alkyl group, a C 1 -C 20 alkenyl group, a C 1 -C 20 alkoxy group, or a C 1 -C 20 alkylthio group, each substituted with deuterium, -F, -CI, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 10 alkyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a (C 1 -C 20 alkyl)cyclopentyl group, a (C 1 -C 20 alkyl)cyclohexyl group, a (C 1 -C 20 alkyl)cycloheptyl group, a (C 1 -C 20 alkyl)cyclooctyl group, a (C 1 -C 20 alkyl)adamantanyl group, a (C 1 -C 20 alkyl)norbornanyl group, a (C 1 -C 20 alkyl)norbornenyl group, a (C 1 -C 20 alkyl)cyclopentenyl group, a (C 1 -C 20 alkyl)cyclohexenyl group, a (C 1 -C 20 alkyl)cycloheptenyl group, a (C 1 -C 20 alkyl)bicyclo[1.1.1]pentyl group, a (C 1 -C 20 alkyl)bicyclo[2.1.1]hexyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.1]heptyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, or any combination thereof; a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl 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, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzoisothiazolyl 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, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, or an azadibenzothiophenyl group, each unsubstituted or substituted with deuterium, -F, -Cl, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C 1 -C 20 alkyl group, a deuterated C 2 -C 20 alkyl group, a fluorinated alkyl group, a C 1 -C 20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a (C 1 -C 20 alkyl)cyclopentyl group, a (C 1 -C 20 alkyl)cyclohexyl group, a (C 1 -C 20 alkyl)cycloheptyl group, a (C 1 -C 20 alkyl)cyclooctyl group, a (C 1 -C 20 alkyl)adamantanyl group, a (C 1 -C 20 alkyl)norbornanyl group, a (C 1 -C 20 alkyl)norbornenyl group, a (C 1 -C 20 alkyl)cyclopentenyl group, a (C 1 -C 20 alkyl)cyclohexenyl group, a (C 1 -C 20 alkyl)cycloheptenyl group, a (C 1 -C 20 alkyl)bicyclo[1.1.1]pentyl group, a (C 1 -C 20 alkyl)bicyclo[2.1.1]hexyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.1]heptyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl 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, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzoisothiazolyl 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, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, or any combination thereof; or -Si(Q 1 )(Q 2 )(Q 3 ), -C(Q 1 )(Q 2 )(Q 3 ), -B(Q 1 )(Q 2 ), or -N(Q 1 )(Q 2 ), and Q 1 to Q 3 may each independently be: deuterium, -F, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CH 2 CH 3 , -CH 2 CD 3 , - CH 2 CD 2 H, -CH 2 CDH 2 , -CHDCH 3 , -CHDCD 2 H, -CHDCDH 2 , -CHDCD 3 , - CD 2 CD 3 , -CD 2 CD 2 H, -CD 2 CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , -CH 2 CF 3 , -CH 2 CF 2 H, - CH 2 CFH 2 , -CHFCH 3 , -CHFCF 2 H, -CHFCFH 2 , -CHFCF 3 , -CF 2 CF 3 , -CF 2 CF 2 H, or -CF 2 CFH 2 ; or an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neopentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, a phenyl group, a biphenyl group, or a naphthyl group, each unsubstituted or substituted with deuterium, -F, a C 1 -C 10 alkyl group, a phenyl group, or any combination thereof.

[0034] In one or more embodiments, in Formula 2-2, R 23 to R 26 may each independently be hydrogen, deuterium, -F, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, - CFH 2 , a C 2 -C 10 alkenyl group, a C 1 -C 10 alkoxy group, a C 1 -C 10 alkylthio group, a group represented by one of Formulae 9-1 to 9-39, a group represented by one of Formulae 9-1 to 9-39 in which at least one hydrogen is substituted with deuterium, a group represented by one of Formulae 9-1 to 9-39 in which at least one hydrogen is substituted with -F, a group represented by one of Formulae 9-201 to 9-236, a group represented by one of Formulae 9-201 to 9-236 in which at least one hydrogen is substituted with deuterium, a group represented by one of Formulae 9-201 to 9-236 in which at least one hydrogen is substituted with -F, a group represented by one of Formulae 10-1 to 10-130, a group represented by one of Formulae 10-1 to 10-130 in which at least one hydrogen is substituted with deuterium, a group represented by one of Formulae 10-1 to 10-130 in which at least one hydrogen is substituted with -F, a group represented by one of Formulae 10-201 to 10-358, a group represented by one of Formulae 10-201 to 10-358 in which at least one hydrogen is substituted with deuterium, a group represented by one of Formulae 10-201 to 10-358 in which at least one hydrogen is substituted with -F, -Si(Q 1 )(Q 2 )(Q 3 ), or -Ge(Q 1 )(Q 2 )(Q 3 ), and

[0035] Q 1 to Q 3 may each independently be: deuterium, -F, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CH 2 CH 3 , -CH 2 CD 3 , - CH 2 CD 2 H, -CH 2 CDH 2 , -CHDCH 3 , -CHDCD 2 H, -CHDCDH 2 , -CHDCD 3 , - CD 2 CD 3 , -CD 2 CD 2 H, -CD 2 CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , -CH 2 CF 3 , -CH 2 CF 2 H, - CH 2 CFH 2 , -CHFCH 3 , -CHFCF 2 H, -CHFCFH 2 , -CHFCF 3 , -CF 2 CF 3 , -CF 2 CF 2 H, or -CF 2 CFH 2 ; or an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neopentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, a phenyl group, a biphenyl group, or a naphthyl group, each unsubstituted or substituted with deuterium, -F, a C 1 -C 10 alkyl group, a phenyl group, or any combination thereof:

[0036] In Formulae 9-1 to 9-39, 9-201 to 9-236, 10-1 to 10-130, and 10-201 to 10-358, * indicates a binding site to a neighboring atom, Ph represents a phenyl group, TMS and SiMe 3 each represent a trimethylsilyl group, and TMG and GeMe 3 each represent a trimethylgermyl group.

[0037] The "group represented by one of Formulae 9-1 to 9-39 in which at least one hydrogen is substituted with deuterium" and the "group represented by one of Formulae 9-201 to 9-236 in which at least one hydrogen is substituted with deuterium" may each independently be, for example, a group represented by one of Formulae 9-501 to 9-514 and 9-601 to 9-636:

[0038] The "group represented by one of Formulae 9-1 to 9-39 in which at least one hydrogen is substituted with -F" and the "group represented by one of Formulae 9-201 to 9-236 in which at least one hydrogen is substituted with -F" may each independently be, for example, a group represented by one of Formulae 9-701 to 9-710:

[0039] The "group in which at least one hydrogen of one of Formulae 10-1 to 10-130 is substituted with deuterium" and "the group in which at least one hydrogen of one of Formulae 10-201 to 10-358 is substituted with deuterium" may each independently be, for example, a group represented by one of Formulae 10-501 to 10-576:

[0040] The "group in which at least one hydrogen of one of Formulae 10-1 to 10-130 is substituted with -F" and "the group in which at least one hydrogen of one of Formulae 10-201 to 10-358 is substituted with -F" may each independently be, for example, a group represented by one of Formulae 10-601 to 10-617:

[0041] In an embodiment, in Formulae 1-1 and 1-2, X 11 to X 16 may each independently be a group represented by Formula 2-11 or 2-21:

[0042] In Formulae 2-11 and 2-21, L 21 and L 22 may respectively be the same as described herein, a21 and a22 may each independently be 0 or 1, and R 201 to R 218 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, or a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group.

[0043] In one or more embodiments, in Formulae 1-1 and 1-2, X 11 to X 16 may each independently be represented by one of Formulae 2-111 to 2-122:

[0044] In Formulae 2-111 to 2-122, t-Bu represents a tert-butyl group, and * indicates a binding site to a neighboring atom.

[0045] In Formulae 1-1 and 1-2, n11 to n16 may each independently be 0, 1, or 2. Here, n11 to n16 indicate the number of substitutions, X 11 to X 16 , respectively.

[0046] The sum of n11 to n16 in Formula 1-1 may be 1 or more, and the sum of n11 to n15 in Formula 1-2 may be 1 or more.

[0047] In an embodiment, the sum of n11 to n15 in Formula 1-1 may be 1 or more.

[0048] In an embodiment, the sum of n11 to n15 in Formulae 1-1 and 1-2 may be 1 or 2.

[0049] In an embodiment, in Formulae 1-1 and 1-2, Y 11 to Y 16 may each independently be a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, or a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group.

[0050] In one or more embodiments, in Formulae 1-1 and 1-2, Y 11 to Y 16 may each independently be a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, or a chrysenyl group, each substituted or unsubstituted with deuterium, -F, -Cl, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a deuterated C 2 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a (C 1 -C 20 alkyl)cyclopentyl group, a (C 1 -C 20 alkyl)cyclohexyl group, a (C 1 -C 20 alkyl)cycloheptyl group, a (C 1 -C 20 alkyl)cyclooctyl group, a (C 1 -C 20 alkyl)adamantanyl group, a (C 1 -C 20 alkyl)norbornanyl group, a (C 1 -C 20 alkyl)norbornenyl group, a (C 1 -C 20 alkyl)cyclopentenyl group, a (C 1 -C 20 alkyl)cyclohexenyl group, a (C 1 -C 20 alkyl)cycloheptenyl group, a (C 1 -C 20 alkyl)bicyclo[1.1.1]pentyl group, a (C 1 -C 20 alkyl)bicyclo[2.1.1]hexyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.1]heptyl group, a (C 1 -C 20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C 1 -C 20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, or any combination thereof.

[0051] In one or more embodiments, in Formulae 1-1 and 1-2, Y 11 to Y 16 may each independently be hydrogen, deuterium, -F, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, - CFH 2 , a C 2 -C 10 alkenyl group, a C 1 -C 10 alkoxy group, a C 1 -C 10 alkylthio group, a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130, a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130 in which at least one hydrogen is substituted with deuterium group, or a group represented by one of Formulae 10-12 to 10-23 and 10-38 to 10-130 in which at least one hydrogen is substituted with -F:

[0052] In Formulae 10-12 to 10-23 and 10-38 to 10-130, "Ph" represents a phenyl group, and * indicates a binding site to a neighboring atom.

[0053] In Formulae 1-1 and 1-2, m11 to m16 may each independently be 0, 1, or 2. In Formulae 1-1 and 1-2, m11 to m16 indicate the number of substituents, Y 11 to Y 16 , respectively.

[0054] In an embodiment, the sum of m11 to m16 in Formula 1-1 may be 1 or more, and the sum of m11 to m15 in Formula 1-2 may be 1 or more.

[0055] In one or more embodiments, in Formulae 1-1 and 1-2, the sum of m11 to m15 may be 1 or more.

[0056] In one or more embodiments, in Formulae 1-1 and 1-2, m11 to m15 may each independently be 1 or 2.

[0057] In Formula 1-1, the sum of n11 to n16 and m11 to m16 may be 2 or more. In Formula 1-2, the sum of n11 to n15 and m11 to m15 may be 2 or more.

[0058] In an embodiment, in Formulae 1-1 and 1-2, the sum of n11 to n15 and m11 to m15 may be 2, 3, 4, or 5.

[0059] In one or more embodiments, in Formulae 1-1 and 1-2, the sum of n11 to n15 and m11 to m15 may be 4 or 5.

[0060] In Formulae 1-1 and 1-2, Z 11 to Z 16 may each independently be a carbon atom, and a bond between Z 11 and Z 12 , a bond between Z 13 and Z 14 , and a bond between Z 15 and Z 16 may each independently be a single bond or a double bond.

[0061] In Formulae 1-1 and 1-2, R 11 to R 18 may each independently be the same as described in connection with R 23 .

[0062] In Formulae 1-1 and 1-2, b11 to b16 may each independently be 0, 1, 2, or 3. In Formulae 1-1 and 1-2, b11 to b16 indicate the number of substituents, R 11 to R 16 , respectively.

[0063] In an embodiment, the heterocyclic compound may be represented by one of Formulae 1-111 and 1-211:

[0064] In Formulae 1-111 and 1-211, R110 to R 114 may each independently be X 11 , Y 11 , or R 11 , R 121 to R 124 may each independently be X 12 , Y 12 , or R 12 , R 131 to R 133 may each independently be X 13 , Y 13 , or R 13 , R 141 to R 143 may each independently be X 14 , Y 14 , or R 14 , R 151 to R 154 may each independently be X 15 , Y 15 , or R 15 , R 161 to R 164 may each independently be X 16 , Y 16 , or R 16 , at least one of R 110 to R 114 , R 121 to R 124 , R 131 to R 133 , R 141 to R 143 , and R 151 to R 154 may be X 11 , X 12 , X 13 , X 14 , or X 15 , at least two of R 110 to R 114 , R 121 to R 124 , R 131 to R 133 , R 141 to R 143 , and R 151 to R 154 may each independently be X 11 , X 12 , X 13 , X 14 , X 15 , Y 11 , Y 12 , Y 13 , Y 14 , or Y 15 , and X 11 to X 16 , Y 11 to Y 16 , and R 11 to R 18 may respectively be the same as described in connection with Formulae 1-1 and 1-2.

[0065] In one or more embodiments, the heterocyclic compound may be represented by one of Formulae 1-11 to 1-24 and 1-31 to 1-44:

[0066] In Formulae 1-11 to 1-24 and 1-31 to 1-44, A 11 to A 16 , X 11 to X 15 , Y 11 to Y 15 , Z 11 to Z 16 , R 11 to R 18 , and b11 to b16 may respectively be the same as described in connection with Formulae 1-1 and 1-2, n11 to n15 may each independently be 1 or 2, m11 to m15 may each independently be 0, 1, or 2, and the sum of n11 to n15 and m11 to m15 may be 2 or more.

[0067] For example, in Formulae 1-11 to 1-24 and 1-31 to 1-44, A 11 to A 16 may each independently be a benzene group.

[0068] For example, in Formulae 1-11 to 1-24 and 1-31 to 1-44, the sum of m11 to m15 may be 1 or more.

[0069] For example, in Formulae 1-11 to 1-24 and 1-31 to 1-44, m11 to m15 may each independently be 1 or 2.

[0070] For example, in Formulae 1-11 to 1-24 and 1-31 to 1-44, the sum of n11 to n15 and m11 to m15 may each independently be 4 or 5.

[0071] In one or more embodiments, the heterocyclic compound may be of Compounds 1 to 78:

[0072] Since the heterocyclic compound has a rigid structure in which aromatic hydrocarbon rings or heteroaromatic rings are condensed with each other, structural relaxation in an excited state may be suppressed. As a result, the heterocyclic compound may have a narrow width of blue emission spectrum and exhibit improved color purity.

[0073] In detail, since the heterocyclic compound includes an N atom in a moiety structure represented by then the heterocyclic compound may have a relatively narrow full width at half maximum (FWHM), and more specifically, may have a narrower FWHM than that of a heterocyclic compound including an O atom or an S atom. For example, it is known that a FWHM of each of TMCz-BO and TMCz-3P that include an O atom or an S atom is 59 nm and 61 nm, respectively (J. U. Kim, I. S. Park, C.-Y. Chan, M. Tanaka, Y. Tsuchiya, H. Nakanotani, C. Adachi, Nat. Commun. 2020, 11, 1765), but a FWHM of TBN-TPA including an N atom with relatively low structural fluidity is 27 nm (X. Liang, Z.-P. Yan, H.-B. Han, Z.-G. Wu, Y.-X. Zheng, H. Meng, J.-L. Zuo, W. Huang, Angew. Chem., Int. Ed. 2018, 57, 11316).

[0074] In addition, in the heterocyclic compound of the present disclosure, the sum of n11 to n16 in Formula 1-1 may be 1 or more, and the sum of n11 to n15 in Formula 1-2 may be 1 or more. In this regard, the heterocyclic compound may have improved luminescence efficiency, and as compared to a compound including an alkylamino group or the like, the heterocyclic compound has a substituent in which an aryl group is substituted for N so that the compound stability may be improved. Accordingly, an organic light-emitting device including the heterocyclic compound may have improved efficiency and / or a long lifespan.

[0075] In the heterocyclic compound, the sum of n11 to n16 and m11 to m16 in Formula 1-1 may each be 2 or more, and the sum of n11 to n15 and m11 to m15 in Formula 1-2 may each be 2 or more. In this regard, due to the extended conjugated bonds in the heterocyclic compound, stabilization of the heterocyclic compound may be achieved. Accordingly, an organic light-emitting device including the heterocyclic compound may have improved efficiency and / or a long lifespan.

[0076] In addition, since the heterocyclic compound has an asymmetric structure in its core, a dense wavelength control may be possible along with shortening of an emission wavelength, thereby providing an organic light emitting device with high efficiency and / or a long life.

[0077] A peak wavelength in photoluminescence (PL) of the heterocyclic compound according to an embodiment is not particularly limited, but may be about 430 nm or more. In one or more embodiments, the peak wavelength may be about 435 nm or more, about 440 nm or more, about 500 nm or less, about 490 nm or less, or about 480 nm or less. When the peak wavelength is within these ranges, the heterocyclic compound according to an embodiment may be particularly suitable for emission of blue light.

[0078] The heterocyclic compound according to an embodiment may have a small FWHM value of an emission intensity of a peak having the PL peak wavelength above. In detail, the heterocyclic compound may have a FWHM value of about 45 nm or less, about 40 nm or less, or about 35 nm or less. When the FWHM is within these ranges, the heterocyclic compound according to an embodiment may have further improved color purity.

[0079] The peak wavelength and the FWHM in the PL may each be measured and / or calculated using a spectrofluorophotometer.

[0080] A highest occupied molecular orbital (HOMO) energy level, a lowest unoccupied molecular orbital (LUMO) energy level, an S 1 energy level, and a T 1 energy level of some compounds of the heterocyclic compound represented by Formula 1-1 or 1-2 are evaluated using the Gaussian 09 program with the molecular structure optimization obtained by B3LYP-based density functional theory (DFT), and results thereof are shown in Table 1. Table 1Compound No.HOMO (eV)LUMO (eV)S 1 (eV)T 1 (eV)1-5.04-1.572.992.586-4.96-1.493.002.628-4.81-1.343.002.6510-5.15-1.683.002.6113-5.00-1.513.012.65

[0081] Referring to Table 1, it is confirmed that the heterocyclic compound represented by Formula 1-1 or 1-2 has electric characteristics suitable for use as a dopant in an emission layer of an electronic device, for example, an organic light-emitting device.

[0082] Synthesis methods of the heterocyclic compound according to an embodiment is not particularly limited, and the heterocyclic compound may be synthesized according to a known synthesis method. In particular, the heterocyclic compound may be synthesized according to or in view of methods described in Examples below. For example, in the methods described in Examples below, the heterocyclic compound according to an embodiment may be synthesized through modifications such as changing raw materials and reaction conditions, adding or excluding some processes, or appropriately combining with other known synthesis methods.

[0083] A method of identifying a structure of the heterocyclic compound according to an embodiment is not particularly limited. The heterocyclic compound including nitrogen according to an embodiment may be identified by a known method (for example, NMR, LC-MS, or the like).Description of FIG. 1

[0084] FIG. 1 is a schematic view of an organic light-emitting device 10 according to an exemplary embodiment. Hereinafter, a structure and a manufacturing method of an organic light-emitting device according to an example of the present disclosure will be described with reference to FIG. 1.

[0085] The organic light-emitting device 10 of FIG. 1 includes a first electrode 11, a second electrode 19 facing the first electrode 11, and an organic layer 10A between the first electrode 11 and the second electrode 19.

[0086] The organic layer 10A may include an emission layer 15, a hole transport region 12 may be arranged between the first electrode 11 and the emission layer 15, and an electron transport region 17 may be arranged between the emission layer 15 and the second electrodes 19.

[0087] A substrate may be additionally arranged under the first electrode 11 or above the second electrode 19. For use as the substrate, any substrate that is used in organic light-emitting devices available in the art may be used, and 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.[First electrode 11]

[0088] The first electrode 11 may be, for example, formed by depositing or sputtering a material for forming the first electrode 11 on the substrate. The first electrode 11 may be an anode. The material for forming the first electrode 11 may be a material with a high work function to facilitate hole injection.

[0089] The first electrode 11 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. In an embodiment, when the first electrode 11 is a transmissive electrode, the material for forming the first electrode 11 may be indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO 2 ), zinc oxide (ZnO), or any combination thereof, but embodiments of the present disclosure are not limited thereto. In one or more embodiments, when the first electrode 110 is a semi-transmissive electrode or a reflective electrode, the material for forming the first electrode 11 may be magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), or any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0090] The first electrode 11 may have a single-layered structure or a multi-layered structure including two or more layers.[Emission layer 15]

[0091] The emission layer 15 may include the heterocyclic compound.

[0092] A thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å, for example, about 200 Å to about 600 Å. When the thickness of the emission layer is within these ranges, excellent luminescence characteristics may be obtained without a substantial increase in driving voltage.First Embodiment - Descriptions of FIG. 4A

[0093] In the First Embodiment, the heterocyclic compound may be a fluorescence emitter. According to the First Embodiment, the emission layer may further include a host (hereinafter, referred to as 'Host A' which is not identical to the heterocyclic compound). Host A may be understood by referring to a host material described below, but embodiments are not limited thereto. Host A may be a fluorescent host.

[0094] FIG. 4A depicts the general energy transfer of the First Embodiment.

[0095] Singlet excitons may be generated in Host A included in the emission layer, and these singlet excitons may be transferred to a fluorescence emitter through Förster energy transfer (FRET).

[0096] Since the singlet excitons generated in Host A accounts for only 25 % of the total excitons, triplet excitons which accounts for 75 % of the total excitons may be fused to one another to be converted into singlet excitons. Accordingly, efficiency of the organic light-emitting device may be further improved. That is, by using a triplet-triplet fusion mechanism, the efficiency of the organic light-emitting device may be further improved.

[0097] According to the First Embodiment, emission components emitted from the heterocyclic compound may account for about 80 % or more, for example, about 90 % or more, of the total emission components emitted from the emission layer. For example, emission components emitted from the heterocyclic compound may account for about 95 % or more of the total emission components emitted from the emission layer.

[0098] Here, the heterocyclic compound may emit fluorescence, and the host may not emit light.

[0099] In the First Embodiment, when the emission layer further includes Host A in addition to the heterocyclic compound, an amount of the heterocyclic compound may be about 50 parts by weight or less, for example, about 30 parts by weight or less, based on 100 parts by weight of the emission layer, and an amount of Host A in the emission layer may be about 50 parts by weight or more, for example, about 70 parts by weight or more, based on 100 parts by weight of the emission layer. However, embodiments of the present disclosure are not limited thereto.

[0100] In the First Embodiment, when the emission layer further includes Host A in addition to the heterocyclic compound, Host A and the heterocyclic compound may satisfy Condition A: E H A S 1 > E S 1 wherein, in Condition A, E(H A ) S1 indicates a lowest excited singlet energy level of Host A, and E S1 indicates a lowest excited singlet energy level of the heterocyclic compound.

[0101] Here, E(H A ) S1 and E S1 may be evaluated using the DFT method of the Gaussian program with structure optimization performed at a degree of B3LYP / 6-31 G(d,p).Second Embodiment - Descriptions of FIG. 4B

[0102] In the Second Embodiment, the heterocyclic compound may be a delayed fluorescence emitter. According to the Second Embodiment, the emission layer may further include a host (hereinafter, referred to as 'Host B' which is not identical to the heterocyclic compound). Host B may be understood by referring a host material described below, but embodiments are not limited thereto.

[0103] FIG. 4B depicts the general energy transfer of the Second Embodiment.

[0104] Singlet excitons generated at a ratio of 25 % in Host B included in the emission layer may be transferred to a delayed fluorescence emitter through FRET. In addition, triplet excitons generated at a ratio of 75 % in Host B included in the emission layer may be transferred to a delayed fluorescence emitter through Dexter energy transfer. The energy transferred to a triplet state of the delayed fluorescence emitter may undergo reverse intersystem crossing (RISC) to a singlet state. Accordingly, by transferring all the singlet excitons and triplet excitons generated in the emission layer to the heterocyclic compound, the organic light-emitting device with improved efficiency may be obtained.

[0105] According to the Second Embodiment, emission components emitted from the heterocyclic compound may account for about 80 % or more, for example, about 90 % or more, of the total emission components emitted from the emission layer. For example, emission components emitted from the heterocyclic compound may account for about 95 % or more of the total emission components emitted from the emission layer.

[0106] Here, the heterocyclic compound may emit fluorescence and / or delayed fluorescence, and the emission components of the heterocyclic compound may be a total of prompt emission components of the heterocyclic compound and delayed fluorescence components by RISC of the heterocyclic compound. In addition, Host B may not emit light.

[0107] In the Second Embodiment, when the emission layer further includes Host B in addition to the heterocyclic compound, an amount of the heterocyclic compound may be about 50 parts by weight or less, for example, about 30 parts by weight or less, based on 100 parts by weight of the emission layer, and an amount of Host B in the emission layer may be about 50 parts by weight or more, for example, about 70 parts by weight or more, based on 100 parts by weight of the emission layer. However, embodiments of the present disclosure are not limited thereto.

[0108] In the Second Embodiment, when the emission layer further includes Host B in addition to the heterocyclic compound, Host B and the heterocyclic compound may satisfy Condition B: E H B S 1 > E S 1 wherein, in Condition B, E(H B ) S1 indicates a lowest excited singlet energy level of Host B, and E S1 indicates a lowest excited singlet energy level of the heterocyclic compound.

[0109] Here, E(H B ) S1 and E S1 may be evaluated using the DFT method of the Gaussian program with structure optimization performed at a degree of B3LYP / 6-31 G(d,p).Third Embodiment and Fourth EmbodimentThird Embodiment - Descriptions of FIG. 4C

[0110] In the Third Embodiment, the heterocyclic compound may be used as a fluorescent emitter, and the emission layer may include a sensitizer, for example, a delayed fluorescence sensitizer. In the Third Embodiment, the emission layer may further include a host (hereinafter, referred to as 'Host C' which is not identical to the heterocyclic compound and the sensitizer) and a sensitizer (hereinafter, referred to as 'Sensitizer A' which is not identical to Host C and the heterocyclic compound). Host C and Sensitizer A may respectively be understood by referring to a host material and a sensitizer material described below, but embodiments are not limited thereto.

[0111] According to the Third Embodiment, emission components emitted from the heterocyclic compound may account for about 80 % or more, for example, about 90 % or more (and for example, about 95 % or more), of the total emission components emitted from the emission layer. For example, the heterocyclic compound may emit fluorescence. In addition, Host C and Sensitizer A may not each emit light.

[0112] FIG. 4C depicts the general energy transfer of the Third Embodiment.

[0113] Singlet and triplet excitons may be generated in Host C included in the emission layer, and these singlet and triplet excitons may be transferred to Sensitizer A first, and then to the heterocyclic compound through FRET. The singlet excitons generated at a ratio of 25 % in Host C may be transferred to Sensitizer A through FRET, and the energy of triplet excitons generated at a ratio of 75 % in Host C may be transferred to a singlet state and a triplet state of Sensitizer A, wherein the energy transferred to the triplet state may undergo RISC to the singlet state, and then, the singlet energy of Sensitizer A may be transferred to the heterocyclic compound through FRET.

[0114] Accordingly, by transferring all the singlet excitons and triplet excitons generated in the emission layer to a dopant, an organic light-emitting device having improved efficiency may be obtained. In addition, since an organic light-emitting device thus obtained has significantly reduced energy loss, lifespan characteristics thereof may be also improved.

[0115] In the Third Embodiment, when the emission layer further includes, in addition to the heterocyclic compound, Host C and Sensitizer A, Host C and Sensitizer A may satisfy Condition C-1 and / or C-2: S 1 H C ≥ S 1 S A S 1 S A ≥ S 1 HC wherein, in Conditions C-1 and C-2, S 1 (H C ) indicates a lowest excited singlet energy level of Host C, S 1 (S A ) indicates a lowest excited singlet energy level of Sensitizer A, and S 1 (HC) indicates a lowest excited singlet energy level of the heterocyclic compound.

[0116] S 1 (H C ), S 1 (S A ), and S 1 (HC) may be evaluated using the DFT method of the Gaussian program with structure optimization performed at a degree of B3LYP / 6-31G(d,p).

[0117] When Host C, Sensitizer A, and the heterocyclic compound satisfy Condition C-1 and / or C-2, FRET from Sensitizer A to the heterocyclic compound may be facilitated, and accordingly, the organic light-emitting device may have improved luminescence efficiency.Fourth Embodiment - Descriptions of FIG. 4D

[0118] In the Fourth Embodiment, the heterocyclic compound may be used as a fluorescence emitter, and the emission layer may include a sensitizer, for example, a phosphorescence sensitizer. In the Fourth Embodiment, the emission layer may further include a host (hereinafter, referred to as 'Host D' which is not identical to the heterocyclic compound and the sensitizer) and a sensitizer (hereinafter, referred to as 'Sensitizer B' which is not identical to Host D and the heterocyclic compound). Host D and Sensitizer B may respectively be understood by referring to a host material and a sensitizer material described below, but embodiments are not limited thereto.

[0119] According to the Fourth Embodiment, emission components emitted from the heterocyclic compound may account for about 80 % or more, for example, about 90 % or more (and for example, about 95 % or more), of the total emission components emitted from the emission layer. For example, the heterocyclic compound may emit fluorescence. In addition, Host D and Sensitizer B may not each emit light.

[0120] FIG. 4D depicts the general energy transfer of the Fourth Embodiment.

[0121] Triplet excitons generated at a ratio of 3:1 (i.e., 75 %) in Host D included in the emission layer may be transferred to Sensitizer B through Dexter energy transfer, and energy of singlet excitons generated at a ratio of 1:3 (i.e., 25 %) in Host D may be transferred to a singlet state and a triplet state of Sensitizer B, wherein the energy transferred to the singlet state of Sensitizer B may undergo ISC to the triplet state, and then, the triplet energy of Sensitizer B may be transferred to the heterocyclic compound through FRET.

[0122] Accordingly, by transferring all the singlet excitons and triplet excitons generated in the emission layer to a dopant, an organic light-emitting device having improved efficiency may be obtained. In addition, since an organic light-emitting device thus obtained has significantly reduced energy loss, lifespan characteristics thereof may be also improved.

[0123] In the Fourth Embodiment, when the emission layer further includes, in addition to the heterocyclic compound, Host D and Sensitizer B, Host D and Sensitizer B may satisfy Condition D-1 and / or D-2: T 1 H D ≥ T 1 S B T 1 S B ≥ S 1 HC wherein, in Conditions D-1 and D-2, T 1 (H D ) indicates a lowest excited triplet energy level of Host D, T 1 (S B ) indicates a lowest excited triplet energy level of Sensitizer B, and S 1 (HC) indicates a lowest excited singlet energy level of the heterocyclic compound.

[0124] T 1 (H D ), T 1 (S B ), and S 1 (HC) may be evaluated using the DFT method of the Gaussian program with structure optimization performed at a degree of B3LYP / 6-31G(d,p).

[0125] When Host D, Sensitizer B, and the heterocyclic compound satisfy Condition D-1 and / or D-2, FRET from Sensitizer B to the heterocyclic compound may be facilitated, and accordingly, the organic light-emitting device may have improved luminescence efficiency.

[0126] In the Third Embodiment and the Fourth Embodiment, an amount of the sensitizer in the emission layer may be in a range of about 5 wt% to about 50 wt%, for example, about 10 wt% to about 30 wt%. Within these ranges, the energy transfer in the emission layer may be effectively achieved, and accordingly, an organic light-emitting device having high efficiency and a long lifespan may be obtained.

[0127] In the Third Embodiment and the Fourth Embodiment, an amount of the heterocyclic compound in the emission layer may be in a range of about 0.01 wt% to about 15 wt%, for example, about 0.05 wt% to about 3 wt%, but embodiments are not limited thereto.

[0128] In the Third Embodiment and the Fourth Embodiment, the sensitizer and the heterocyclic compound may further satisfy Condition 5: 0 μs < T decay HC < 5 μs wherein, in Condition 5, T decay (HC) indicates a decay time of the heterocyclic compound.

[0129] The decay time of the heterocyclic compound was measured from a time-resolved photoluminescence (TRPL) spectrum at room temperature of a film (hereinafter, referred to as "Film HC") having a thickness of 40 nm formed by vacuum-depositing the host and the heterocyclic compound included in the emission layer on a quartz substrate at a weight ratio of 90:10 at a vacuum pressure of 10 -7< torr (wherein 1 torr = 133.322 Pa)Fifth Embodiment - Descriptions of FIG. 4E

[0130] In the Fifth Embodiment, the heterocyclic compound may be used as a delayed fluorescence emitter, and the emission layer may include a sensitizer, for example, a delayed fluorescence sensitizer. In the Fifth Embodiment, the emission layer may further include a host (hereinafter, referred to as 'Host E' which is not identical to the heterocyclic compound and the sensitizer) and a sensitizer (hereinafter, referred to as 'Sensitizer C' which is not identical to Host E and the heterocyclic compound). Host E and Sensitizer C may respectively be understood by referring to a host material and a sensitizer material described below, but embodiments are not limited thereto.

[0131] According to the Fifth Embodiment, emission components emitted from the heterocyclic compound may account for about 80 % or more, for example, about 90 % or more (and for example, about 95 % or more), of the total emission components emitted from the emission layer. For example, the heterocyclic compound may emit fluorescence and / or delayed fluorescence. In addition, Host E and Sensitizer C may not each emit light.

[0132] Here, the heterocyclic compound may emit fluorescence and / or delayed fluorescence, and the emission components of the heterocyclic compound may be a total of prompt emission components of the heterocyclic compound and delayed fluorescence components by RISC of the heterocyclic compound.

[0133] FIG. 4E depicts the general energy transfer of the Fifth Embodiment.

[0134] Singlet excitons generated at a ratio of 25 % in Host E included in the emission layer may be transferred to a singlet state of Sensitizer C through FRET, and energy of triplet excitons generated at a ratio of 75 % in Host E may be transferred to a triplet state of Sensitizer C, wherein the energy transferred to the singlet state of Sensitizer B may undergo ISC to the triplet state, and then, the triplet energy of Sensitizer B may be transferred to the heterocyclic compound through FRET. The energy transferred to the triplet state of Sensitizer C may undergo RISC to the singlet state. In addition, in the case of Sensitizer C, the energy of the triplet excitons generated in Sensitizer C may undergo reverse transfer to Host E first, and then to the heterocyclic compound, thereby emitting light by reverse intersystem transfer.

[0135] Accordingly, by transferring all the singlet excitons and triplet excitons generated in the emission layer to a dopant, an organic light-emitting device having improved efficiency may be obtained. In addition, since an organic light-emitting device thus obtained has significantly reduced energy loss, lifespan characteristics thereof may be also improved.

[0136] In the Fifth Embodiment, when the emission layer further includes, in addition to the heterocyclic compound, Host E and Sensitizer C, Host E and Sensitizer C may satisfy Condition E-1, E-2, and / or E-3: S 1 H E ≥ S 1 S C S 1 S C ≥ S 1 HC T 1 S C ≥ T 1 HC wherein, in Conditions E-1, E-2, and E-3, S 1 (H E ) indicates a lowest excited singlet energy level of Host E, S 1 (S C ) indicates a lowest excited singlet energy level of Sensitizer C, S 1 (HC) indicates a lowest excited singlet energy level of the heterocyclic compound, T 1 (S C ) indicates a lowest excited triplet energy level of Sensitizer C, and T 1 (HC) indicates a lowest excited triplet energy level of the heterocyclic compound.

[0137] S 1 (H E ), S 1 (S C ), S 1 (HC), T 1 (S C ), and T 1 (HC) may be evaluated using the DFT method of the Gaussian program with structure optimization performed at a degree of B3LYP / 6-31G(d,p).

[0138] When Host E, Sensitizer C, and the heterocyclic compound satisfy Condition E-1, E-2, and / or E-3, Dexter transfer and FRET from Sensitizer C to the heterocyclic compound may be facilitated, and accordingly, the organic light-emitting device may have improved luminescence efficiency.

[0139] In the Fifth Embodiment, an amount of Sensitizer C in the emission layer may be in a range of about 5 wt% to about 50 wt%, for example, about 10 wt% to about 30 wt%. Within these ranges, the energy transfer in the emission layer may be effectively achieved, and accordingly, an organic light-emitting device having high efficiency and a long lifespan may be obtained.

[0140] In the Fifth Embodiment, an amount of the heterocyclic compound in the emission layer may be in a range of about 0.01 wt% to about 15 wt%, for example, about 0.05 wt% to about 3 wt%, but embodiments are not limited thereto.[Host in emission layer 15]

[0141] The host may include no metal atom.

[0142] In an embodiment, the host may include one kind of host. When the host includes one kind of host, the one host may be a bipolar host, an electron-transporting host, or a hole-transporting host, which will be described below.

[0143] In one or more embodiments, the host may include a mixture of two or more different types of host. For example, the host may be a mixture of an electron-transporting host and a hole-transporting host, a mixture of two types of electron-transporting hosts different from each other, or a mixture of two types of hole-transporting hosts different from each other. The electron-transporting host and the hole-transporting host may be understood by referring to the related descriptions provided below.

[0144] In one or more embodiments, the host may include an electron-transporting host including at least one electron-transporting moiety and a hole-transporting host that is free of an electron-transporting moiety.

[0145] In an embodiment, the electron-transporting moiety used herein may be a cyano group, a π electron-depleted nitrogen-containing cyclic group, and a group represented by one of the following formulae:

[0146] In the formulae, *, *', and *" each indicate a binding site to a neighboring atom.

[0147] In one or more embodiments, the electron-transporting host included in the emission layer 15 may include at least one of a cyano group and a π electron-depleted nitrogen-containing cyclic group.

[0148] In one or more embodiments, the electron-transporting host included in the emission layer 15 may include at least one cyano group.

[0149] In one or more embodiments, the electron-transporting host included in the emission layer 15 may include at least one cyano group and at least one π electron depleted nitrogen-containing cyclic group.

[0150] In one or more embodiments, the host may include an electron-transporting host and a hole-transporting host, wherein the electron-transporting host may include at least one π electron-depleted nitrogen-free cyclic group and at least one electron-transporting moiety, and the hole-transporting host may include at least one π electron-depleted nitrogen-free cyclic group and may not include an electron-transporting moiety.

[0151] The term "π electron-depleted nitrogen-containing cyclic group" as used herein refers to a cyclic group having at least one *-N=*' moiety, and for example, may be: an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group; and a condensed cyclic group in which two or more π electron- efficient nitrogen-containing cyclic groups are condensed with each other.

[0152] Meanwhile, the π electron-depleted nitrogen-free cyclic group may be: a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthylene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, a hexacene group, a pentacene group, a rubicene group, a corogen group, an ovalene group, a pyrrole group, an isoindole group, an indole group, a furan group, a thiophene group, a benzofuran group, a benzothiophene group, a benzocarbazole group, a dibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group, a dibenzothiophene sulfone group, a carbazole group, a dibenzosilole group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, a triindolobenzene group, or a condensed cyclic group of two or more π electron-depleted nitrogen-free cyclic groups, but embodiments of the present disclosure are not limited thereto.

[0153] In one or more embodiments, the electron-transporting host may be compounds represented by Formula E-1, and the hole-transporting host may be a compound represented by Formula H-1, but embodiments of the present disclosure are not limited thereto:         <Formula E-1>     [Ar 301 ] xb11 -[(L 301 ) xb1 -R 301 ] xb21 wherein, in Formula E-1, Ar 301 may be a substituted or unsubstituted C 5 -C 60 carbocyclic group or a substituted or unsubstituted C 1 -C 60 heterocyclic group, xb11 may be 1, 2, or 3, L 301 may be a single bond, a group represented by one of the following formulae, a substituted or unsubstituted C 5 -C 60 carbocyclic group, or a substituted or unsubstituted C 1 -C 60 heterocyclic group, wherein *, *', and *" in the following formulae each indicate a binding site to a neighboring atom, xb1 may be an integer from 1 to 5, R 301 may be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent aromatic condensed polycyclic group, a substituted or unsubstituted monovalent aromatic condensed heteropolycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, --Si(Q 301 )(Q 302 )(Q 303 ), -N(Q 301 )(Q 302 ), -B(Q 301 )(Q 302 ), -C(=O)(Q 301 ), - S(=O) 2 (Q 301 ), -S(=O)(Q 301 ), -P(=O)(Q 301 )(Q 302 ), or -P(=S)(Q 301 )(Q 302 ), xb21 may be an integer from 1 to 5, Q 301 to Q 303 may each independently be a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group, and at least one of Conditions H-1 to H-3 may be satisfied: Condition H-1: at least one of Ar 301 , L 301 , and R 301 in Formula E-1 each independently includes a π electron-depleted nitrogen-containing cyclic group, Condition H-2: L 301 in Formula E-1 is a group represented by one of the following formulae: and Condition H-3: R 301 in Formula E-1 is a cyano group, -S(=O) 2 (Q 301 ), -S(=O)(Q 301 ), - P(=O)(Q 301 )(Q 302 ), and -P(=S)(Q 301 )(Q 302 ),         <Formula H-1>     Ar 401 -(L 401 ) xd1 -(Ar 402 ) xd11 wherein, in Formulae H-1, 11, and 12, L401 may be: a single bond; or a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthylene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, a hexacene group, a pentacene group, a rubicene group, a corogen group, an ovalene group, a pyrrole group, an isoindole group, an indole group, a furan group, a thiophene group, a benzofuran group, a benzothiophene group, a benzocarbazole group, a dibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group, a dibenzothiophene sulfone group, a carbazole group, a dibenzosilole group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, or a triindolobenzene group, each unsubstituted or substituted with at least one deuterium, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a triphenylenyl group, a biphenyl group, a terphenyl group, a tetraphenyl group, -Si(Q 401 )(Q 402 )(Q 403 ), or any combination thereof, xd1 may be an integer from 1 to 10, wherein, when xd1 is 2 or more, two or more of L 401 may be identical to or different from each other, Ar 401 may be a group represented by Formulae 11 and 12, Ar 402 may be: a group represented by Formulae 11 or 12, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, or a triphenylenyl group; or a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, or a triphenylenyl group, each substituted with at least one deuterium, a hydroxyl group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, a triphenylenyl group, or any combination thereof, CY 401 and CY 402 may each independently be a benzene group, a naphthalene group, a fluorene group, a carbazole group, a benzocarbazole group, an indolocarbazole group, a dibenzofuran group, a dibenzothiophene group, a dibenzosilole group, a benzonaphthofuran group, a benzonaphthothiophene group, or a benzonaphthosilole group, A 21 may be a single bond, O, S, N(R 51 ), C(R 51 )(R 52 ), or Si(R 51 )(R 52 ), A 22 may be a single bond, O, S, N(R 53 ), C(R 53 )(R 54 ), or Si(R 53 )(R 54 ), at least one of A 21 and A 22 in Formula 12 may not be a single bond, R 51 to R 54 , R 60 , and R 70 may each independently be: hydrogen, deuterium, a hydroxyl group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, or a C 1 -C 20 alkoxy group; a C 1 -C 20 alkyl group or a C 1 -C 20 alkoxy group, each substituted with at least one deuterium, a hydroxyl 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 naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, or any combination thereof; a π electron-depleted nitrogen-free cyclic group (for example, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, and a triphenylenyl group); a π electron-depleted nitrogen-free cyclic group (for example, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, and a triphenylenyl group), each substituted with at least one deuterium, a hydroxyl group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group or any combination thereof; or         -Si(Q 404 )(Q 405 )(Q 406 ), e1 and e2 may each independently be an integer from 0 to 10, Q 401 to Q 406 may each independently be hydrogen, deuterium, a hydroxyl 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 naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a biphenyl group, a terphenyl group, or a triphenylenyl group, and * indicates a binding site to a neighboring atom.

[0154] In an embodiment, Ar 301 and L 301 in Formula E-1 may each independently be a benzene group, a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a dibenzofuran group, a dibenzothiophene group, an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, a cyano-containing naphthyl group, a pyridinyl group, a phenylpyridinyl group, a diphenylpyridinyl group, a biphenylpyridinyl group, a di(biphenyl)pyridinyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a di(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a di(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a di(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a di(biphenyl)triazinyl group, - Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), - P(=O)(Q 31 )(Q 32 ), or any combination thereof, at least one of L 301 (s) in the number of xb1 may each independently be an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, a cyano-containing naphthyl group, a pyridinyl group, a phenylpyridinyl group, a diphenylpyridinyl group, a biphenylpyridinyl group, a di(biphenyl)pyridinyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a di(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a di(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a di(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a di(biphenyl)triazinyl group, -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), - P(=O)(Q 31 )(Q 32 ), or any combination thereof, and R 301 may be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a tetraphenyl group, a naphthyl group, a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, a cyano-containing tetraphenyl group, a cyano-containing naphthyl group, a pyridinyl group, a phenylpyridinyl group, a diphenylpyridinyl group, a biphenylpyridinyl group, a di(biphenyl)pyridinyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a di(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a di(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a di(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a di(biphenyl)triazinyl group, -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), or - P(=O)(Q 31 )(Q 32 ), and Q 31 to Q 33 may each independently be a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group, but embodiments of the present disclosure are not limited thereto.

[0155] In one or more embodiments, Ar 301 may be: a benzene group, a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a dibenzofuran group, or a dibenzothiophene group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, a cyano-containing naphthyl group, a pyridinyl group, a phenylpyridinyl group, a diphenylpyridinyl group, a biphenylpyridinyl group, a di(biphenyl)pyridinyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a di(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a di(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a di(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a di(biphenyl)triazinyl group, -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), - P(=O)(Q 31 )(Q 32 ), or any combination thereof; or a group represented by one of Formulae 5-1 to 5-3 or Formulae 6-1 to 6-33, and L 301 may be a group represented by one of Formulae 5-1 to 5-3 and Formulae 6-1 to 6-33:

[0156] In Formulae 5-1 to 5-3 and 6-1 to 6-33, Z 1 may be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, a cyano-containing naphthyl group, a pyridinyl group, a phenylpyridinyl group, a diphenylpyridinyl group, a biphenylpyridinyl group, a di(biphenyl)pyridinyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a di(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a di(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a di(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a di(biphenyl)triazinyl group, -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), or - P(=O)(Q 31 )(Q 32 ), d4 may be 0, 1, 2, 3, or 4, d3 may be 0, 1, 2, or 3, d2 may be 0, 1, or 2, * and *' each indicate a binding site to a neighboring atom, and Q 31 to Q 33 may respectively be the same as described herein.

[0157] In one or more embodiments, L 301 may be a group represented by Formulae 5-2, 5-3, and 6-8 to 6-33.

[0158] In one or more embodiments, R 301 may be a cyano group or a group represented by one of Formula 7-1 to 7-18, and at least one of Ar 402 (s) in the number of xd11 may be a group represented by one of Formulae 7-1 to 7-18, but embodiments of the present disclosure are not limited thereto:

[0159] In Formulae 7-1 to 7-18, xb41 to xb44 may each be 0, 1, or 2, wherein xb41 in Formula 7-10 is not 0, the sum of xb41 and xb42 in Formulae 7-11 to 7-13 is not 0, the sum of xb41, xb42, and xb43 in Formulae 7-14 to 7-16 is not 0, the sum of xb41, xb42, xb43, and xb44 in Formulae 7-17 and 7-18 is not 0, and * indicates a binding site to a neighboring atom.

[0160] In Formula E-1, two or more of Ar 301 may be identical to or different from each other, and two or more of L 301 may be identical to or different from each other. In Formula H-1, two or more of L 401 may be identical to or different from each other, and two or more of Ar 402 may be identical to or different from each other.

[0161] In an embodiment, the electron-transporting host includes i) at least one of a cyano group, a pyrimidine group, a pyrazine group, a triazine group, or a combination thereof, or ii) a triphenylene group, and the hole-transporting host may include a carbazole group.

[0162] In one or more embodiments, the electron-transporting host may include at least one cyano group.

[0163] The electron-transporting host may be, for example, compounds of Groups HE1 to HE7, but embodiments of the present disclosure are not limited thereto:

[0164] In one or more embodiments, the electron-transporting host may include DPEPO or TSPO1:

[0165] In one or more embodiments, the hole-transporting host may be compounds of Group HH1, but embodiments of the present disclosure are not limited thereto:

[0166] In one or more embodiments, the bipolar host may be compounds of Group HEH1, but embodiments of the present disclosure are not limited thereto:

[0167] In Compounds 1 to 432, Ph represents a phenyl group.

[0168] In one or more embodiments, the hole-transporting host may include o-CBP or mCP:

[0169] In an embodiment, the host may be a fluorescent host, and such a fluorescent host may be, for example, represented by one of Formulae FH-1 to FH-4.

[0170] In an embodiment, the fluorescent host may be represented by Formula FH-1:

[0171] In Formula FH-1, Ar 1 to Ar 3 may each independently be a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - N(Q 1 )(Q 2 ), -Si(Q 3 )(Q 4 )(Q 5 ), -B(Q 6 )(Q 7 ), or -P(=O)(Q 8 )(Q 9 ), Ar 1 to Ar 3 may each independently be a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, or a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, L 10 may be an unsubstituted or substituted C 5 -C 30 carbocyclic group or an unsubstituted or substituted C 1 -C 30 heterocyclic group, a10 may be an integer from 0 to 3, wherein, when a10 is 2 or more, two or more of L 10 may be identical to or different from each other, R 10 and R 20 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -N(Q 1 )(Q 2 ), -Si(Q 3 )(Q 4 )(Q 5 ), -B(Q 6 )(Q 7 ), or - P(=O)(Q 8 )(Q 9 ), b10 and b20 may each independently be an integer from 1 to 8, when b10 is 2 or more, two or more of R 10 may be identical to or different from each other, and when b20 is 2 or more, two or more of R 20 may be identical to or different from each other, c10 may be an integer from 1 to 9, and when c10 is 2 or more two or more of -[(L 10 ) a10 -(R 10 ) b10 ] may be identical to or different from each other.

[0172] In detail, the fluorescent host represented by Formula FH-1 may be compounds of Group FH1, embodiments of the present disclosure are not limited thereto:

[0173] In one or more embodiments, the fluorescent host may be represented by Formula FH-2:

[0174] In Formula FH-2, X 1 may be O or S, A 1 may be a C 5 -C 60 carbocyclic group or a C 1 -C 60 heterocyclic group, L 11 may be an unsubstituted or substituted C 5 -C 60 carbocyclic group or an unsubstituted or substituted C 1 -C 60 heterocyclic group, a11 may be an integer from 0 to 3, Ar 11 and Ar 12 may each independently be a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each unsubstituted or substituted with at least one R a , b11 may be an integer from 1 to 5, R 11 , R 12 , and R a may each independently be 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 C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q 1 )(Q 2 )(Q 3 ), -N(Q 4 )(Q 5 ), or -B(Q 6 )(Q 7 ), c11 may be an integer from 1 to 20, c12 may be an integer from 1 to 4, when c11 is 2 or more, two neighboring R 11 (s) may optionally be linked to each other to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, when c12 is 2 or more, two neighboring R 12 (s) may optionally be linked to each other to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, A 1 and Ar 12 may optionally be linked to each other via a first linking group a single bond, *-Ar 31 -*', *-O-*', *-S-*', *-[C(R 31 )(R 32 )] k11 -*', *-C(R 31 )=*', *=C(R 31 )-*', *-C(R 31 )=C(R 32 )-*', *-C(=O)-*', *-C(=S)-*', *-C≡C-*', *-N(R 31 )-*', *-P(R 31 )-*', *-[Si(R 31 )(R 32 )] k11 -*', or *-P(R 31 )(R 32 )-*' to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, Ar 31 may be a C 5 -C 30 carbocyclic group, R 31 and R 32 may each be the same as described in connection with R 11 , and k11 may be 1, 2, 3, or 4.

[0175] In detail, the fluorescent host represented by Formula FH-2 may be a compound of Group FH2, embodiments of the present disclosure are not limited thereto:

[0176] In one or more embodiments, the fluorescent host may be represented by Formula FH-3:

[0177] In Formula FH-3, Ar 1 may be a group represented by Formula 2:

[0178] In Formula 2, Ar 1 may include at least one cyano group, A 1 and A 2 may each independently be a C 5 -C 30 carbocyclic group or a C 1 -C 30 heterocyclic group, L 1 may be an unsubstituted or substituted C 5 -C 30 carbocyclic group or an unsubstituted or substituted C 1 -C 30 heterocyclic group, a1 may be 0, 1, 2, or 3, when a1 is two or more, two or more of L 1 may be identical to or different from each other, m1 may be 0, 1, 2, or 3, and Ar11 may be a group represented by Formula 4, Ar12 may be a group represented by Formula 5, and Ar13 may be a group represented by Formula 6: wherein, in the formulae above, R 1 , R 10 , R 20 , R 30 , R 40 , R 50 , and R 60 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -N(Q 1 )(Q 2 ), -Si(Q 3 )(Q 4 )(Q 5 ), -B(Q 6 )(Q 7 ), or - P(=O)(Q 8 )(Q 9 ), b1 may be an integer from 1 to 5, when b1 is two or more, two or more of R 1 may be identical to or different from each other, b10 may be an integer from 1 to 8, when b10 is two or more, two or more of R 10 may be identical to or different from each other, b20 and b30 may each independently be an integer from 1 to 4, when b20 is 2 or more, two or more of R 20 may be identical to or different from each other, and when b30 is 2 or more, two or more of R 30 may be identical to or different from each other, b40, b50, and b60 may each independently be an integer from 1 to 4, when b40 is 2 or more, two or more of R 40 may be identical to or different from each other, when b50 is 2 or more, two or more of R 50 may be identical to or different from each other, and when b60 is 2 or more, two or more of R 60 may be identical to or different from each other, and * and *' each indicate a binding site to a neighboring atom.

[0179] In one or more embodiments, the fluorescent host represented by Formula FH-3 may be a compound of Group FH3, embodiments of the present disclosure are not limited thereto:

[0180] In one or more embodiments, the fluorescent host may be represented by Formula FH-4:

[0181] In Formula FH-4, X 1 may be O or Se, Ar 1 may be a group represented by Formula 1A, and Ar 2 may be a group represented by Formula 1B:

[0182] In Formulae 1A and 1B, L 1 and L 2 may each independently be a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, a1 and a2 may each independently be an integer from 0 to 3, when a1 is 2 or more, two or more of L 1 may be identical to or different from each other, and when a2 is 2 or more, two or more of L 2 may be identical to or different from each other, R 1 , R 2 , R 10 , R 20 , R 30 , and R 40 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, -SFs, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -N(Q 1 )(Q 2 ), -Si(Q 3 )(Q 4 )(Q 5 ), - B(Q 6 )(Q 7 ), or -P(=O)(Q 8 )(Q 9 ), b1 and b2 may each independently be an integer from 1 to 5, when b1 is 2 or more, two or more of R 1 may be identical to or different from each other, and when b2 is 2 or more, two or more of R 2 may be identical to or different from each other, b10 and b20 may each independently an integer from 1 to 8, b30 and b40 may each independently an integer from 1 to 3, c1 and c2 may each independently be an integer from 1 to 8, and the sum of b10 and c1 may be 9, and the sum of b20 and c2 may be 9.

[0183] In detail, the fluorescent host represented by Formula FH-4 may be a compound of Group FH4, embodiments of the present disclosure are not limited thereto:

[0184] When the host is a mixture of the electron-transporting host and the hole-transporting host, a weight ratio of the electron-transporting host to the hole-transporting host may be in a range of about 1:9 to about 9:1, for example, about 2:8 to about 8:2, for example, about 4:6 to about 6:4, for example, about 5:5. When the weight ratio of the electron-transporting host to the hole-transporting host is within the ranges above, the hole-and-electron-transporting balance in the emission layer 15 may be achieved.[Dopant in emission layer 15]

[0185] The dopant included in the emission layer 15 may include the heterocyclic compound.[Sensitizer in emission layer 15]

[0186] In an embodiment, the sensitizer included in the emission layer 15 may include a phosphorescent sensitizer including at least one metal a first-row transition metal, a second-row transition metal, a third-row transition metal, or a combination thereof, of the Periodic Table of Elements.

[0187] In one or more embodiments, the sensitizer may include an organic ligand L 1 and at least one metal M 11 of a first-row transition metal, a second-row transition metal, a third-row transition metal of the Periodic Table of Elements, wherein L 1 and M 11 may form 1, 2, 3, or 4 cyclometallated rings.

[0188] In one or more embodiments, the sensitizer may include an organometallic compound represented by Formula 103:         Formula 103     M11(L11)n11(L12)n12 wherein, in Formula 103, M 11 may be a first-row transition metal, a second-row transition metal, or a third-row transition metal of the Periodic Table of Elements, L 11 may be a ligand represented by one of Formulae 1-1 to 1-4, L 12 may be a monodentate ligand or a bidentate ligand, n11 may be 1, and n12 may be 0, 1, or 2,

[0189] In Formulae 1-1 to 1-4, A 1 to A 4 may each independently be a substituted or unsubstituted Cs-C 30 carbocyclic group, a substituted or unsubstituted C 1 -C 30 heterocyclic group, or a non-cyclic group, Y 11 to Y 14 may each independently be a chemical bond, O, S, N(R 91 ), B(R 91 ), P(R 91 ), or C(R 91 )(R 92 ), T 1 to T 4 may each independently be a single bond, a double bond, *-N(R 93 )-*', *-B(R 93 )-*', *-P(R 93 )-*', *-C(R 93 )(R 94 )-*', *-Si(R 93 )(R 94 )-*', *-Ge(R 93 )(R 94 )-*', *-S-*', *-Se-*', *-O-*', *-C(=O)-*', *-S(=O)-*', *-S(=O) 2 -*', *-C(R 93 )=*', *=C(R 93 )-*', *-C(R 93 )=C(R 94 )-*', *-C(=S)-*', or *-C=C-*', a substituent of the substituted C 5 -C 30 carbocyclic group, a substituent of substituted C 1 -C 30 heterocyclic group, and R 91 to R 94 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, -SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent aromatic condensed polycyclic group, a substituted or unsubstituted monovalent aromatic condensed heteropolycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q 1 )(Q 2 )(Q 3 ), -Ge(Q 1 )(Q 2 )(Q 3 ), -C(Q 1 )(Q 2 )(Q 3 ), - B(Q 1 )(Q 2 ), -N(Q 1 )(Q 2 ), -P(Q 1 )(Q 2 ), -C(=O)(Q 1 ), -S(=O)(Q 1 ), -S(=O) 2 (Q 1 ), - P(=O)(Q 1 )(Q 2 ), or -P(=S)(Q 1 )(Q 2 ), wherein each of a substituent of the substituted C 5 -C 30 carbocyclic group and a substituent of substituted C 1 -C 30 heterocyclic group may not be hydrogen, * 1 , * 2 , * 3 , and * 4 each indicate a binding site to M 11 , and Q 1 to Q 3 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 7 -C 60 alkylaryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a C 2 -C 60 alkyl heteroaryl group, a C 1 -C 60 heteroaryloxy group, a C 1 -C 60 heteroarylthio group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group that is substituted with at least one deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof, or a C 6 -C 60 aryl group that is substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof.

[0190] In one or more embodiments, the sensitizer may be a compound of Groups I to X, but embodiments of the present disclosure are not limited thereto: a compound represented by Formula A:         Formula A     (L 101 ) n101 -M 101 -(L 102 ) m101 wherein, in Formula A, L 101 , n101, M 101 , L 102 , and m101 may respectively be the same as described in Tables 2 to 4: Table 2Compound nameL 101 n1 01M 1 01 L 1 02 m1 01Compound nameL 101 n1 01M 1 01 L 1 02 m1 01BD001LM 13Ir-0BD051LM5 13Ir-0BD002LM 23Ir-0BD052LM5 23Ir-0BD003LM 33Ir-0BD053LM5 33Ir-0BD004LM 43Ir-0BD054LM5 43Ir-0BD005LM 53Ir-0BD055LM5 53Ir-0BD006LM 63Ir-0BD056LM5 63Ir-0BD007LM 73Ir-0BD057LM5 73Ir-0BD008LM 83Ir-0BD058LM5 83Ir-0BD009LM 93Ir-0BD059LM5 93Ir-0BD010LM 103Ir-0BD060LM6 03Ir-0BD011LM 113Ir-0BD061LM6 13Ir-0BD012LM 123Ir-0BD062LM6 23Ir-0BD013LM 133Ir-0BD063LM6 33Ir-0BD014LM 143Ir-0BD064LM6 43Ir-0BD015LM 153Ir-0BD065LM6 53Ir-0BD016LM 163Ir-0BD066LM6 63Ir-0BD017LM 173Ir-0BD067LM6 73Ir-0BD018LM 183Ir-0BD068LM6 83Ir-0BD019LM 193Ir-0BD069LM6 93Ir-0BD020LM 203Ir-0BD070LM7 03Ir-0BD021LM 213Ir-0BD071LM7 13Ir-0BD022LM 223Ir-0BD072LM7 23Ir-0BD023LM 233Ir-0BD073LM7 33Ir-0BD024LM 243Ir-0BD074LM7 43Ir-0BD025LM 253Ir-0BD075LM7 53Ir-0BD026LM 263Ir-0BD076LM7 63Ir-0BD027LM 273Ir-0BD077LM7 73Ir-0BD028LM 283Ir-0BD078LM7 83Ir-0BD029LM 293Ir-0BD079LM7 93Ir-0BD030LM 303Ir-0BD080LM8 03Ir-0BD031LM 313Ir-0BD081LM8 13Ir-0BD032LM 323Ir-0BD082LM8 23Ir-0BD033LM 333Ir-0BD083LM8 33Ir-0BD034LM 343Ir-0BD084LM8 43Ir-0BD035LM 353Ir-0BD085LM8 53Ir-0BD036LM 363Ir-0BD086LM8 63Ir-0BD037LM 373Ir-0BD087LM8 73Ir-0BD038LM 383Ir-0BD088LM8 83Ir-0BD039LM 393Ir-0BD089LM8 93Ir-0BD040LM 403Ir-0BD090LM9 03Ir-0BD041LM 413Ir-0BD091LM9 13Ir-0BD042LM 423Ir-0BD092LM9 23Ir-0BD043LM 433Ir-0BD093LM9 33Ir-0BD044LM 443Ir-0BD094LM9 43Ir-0BD045LM 453Ir-0BD095LM9 53Ir-0BD046LM 463Ir-0BD096LM9 63Ir-0BD047LM 473Ir-0BD097LM9 73Ir-0BD048LM 483Ir-0BD098LM9 83Ir-0BD049LM 493Ir-0BD099LM9 93Ir-0BD050LM 503Ir-0BD100LM1 003Ir-0 Table 3 Compound nameL 101 n1 01M 1 01 L 1 02 m1 01Compound nameL 101 n1 01M 1 01 L 1 02 m1 01BD101LM1 013Ir-0BD151LM1 513Ir-0BD102LM1 023Ir-0BD152LM1 523Ir-0BD103LM1 033Ir-0BD153LM1 533Ir-0BD104LM1 043Ir-0BD154LM1 543Ir-0BD105LM1 053Ir-0BD155LM1 553Ir-0BD106LM1 063Ir-0BD156LM1 563Ir-0BD107LM1 073Ir-0BD157LM1 573Ir-0BD108LM1 083Ir-0BD158LM1 583Ir-0BD109LM1 093Ir-0BD159LM1 593Ir-0BD110LM1 103Ir-0BD160LM1 603Ir-0BD111LM1 113Ir-0BD161LM1 613Ir-0BD112LM1 123Ir-0BD162LM1 623Ir-0BD113LM1 133Ir-0BD163LM1 633Ir-0BD114LM1 143Ir-0BD164LM1 643Ir-0BD115LM1 153Ir-0BD165LM1 653Ir-0BD116LM1 163Ir-0BD166LM1 663Ir-0BD117LM1 173Ir-0BD167LM1 673Ir-0BD118LM1 183Ir-0BD168LM1 683Ir-0BD119LM1 193Ir-0BD169LM1 693Ir-0BD120LM1 203Ir-0BD170LM1 703Ir-0BD121LM1 213Ir-0BD171LM1 713Ir-0BD122LM1 223Ir-0BD172LM1 723Ir-0BD123LM1 233Ir-0BD173LM1 733Ir-0BD124LM1 243Ir-0BD174LM1 743Ir-0BD125LM1 253Ir-0BD175LM1 753Ir-0BD126LM1 263Ir-0BD176LM1 763Ir-0BD127LM1 273Ir-0BD177LM1 773Ir-0BD128LM1 283Ir-0BD178LM1 783Ir-0BD129LM1 293Ir-0BD179LM1 793Ir-0BD130LM1 303Ir-0BD180LM1 803Ir-0BD131LM1 313Ir-0BD181LM1 813Ir-0BD132LM1 323Ir-0BD182LM1 823Ir-0BD133LM1 333Ir-0BD183LM1 833Ir-0BD134LM1 343Ir-0BD184LM1 843Ir-0BD135LM1 353Ir-0BD185LM1 853Ir-0BD136LM1 363Ir-0BD186LM1 863Ir-0BD137LM1 373Ir-0BD187LM1 873Ir-0BD138LM1 383Ir-0BD188LM1 883Ir-0BD139LM1 393Ir-0BD189LM1 893Ir-0BD140LM1 403Ir-0BD190LM1 903Ir-0BD141LM1 413Ir-0BD191LM1 913Ir-0BD142LM1 423Ir-0BD192LM1 923Ir-0BD143LM1 433Ir-0BD193LM1 933Ir-0BD144LM1 443Ir-0BD194LM1 943Ir-0BD145LM1 453Ir-0BD195LM1 953Ir-0BD146LM1 463Ir-0BD196LM1 963Ir-0BD147LM1 473Ir-0BD197LM1 973Ir-0BD148LM1 483Ir-0BD198LM1 983Ir-0BD149LM1 493Ir-0BD199LM1 993Ir-0BD150LM1 503Ir-0BD200LM2 003Ir-0 Table 4 Compound nameL 101 n1 01M 1 01 L 1 02 m1 01Compound nameL 101 n1 01M 1 01 L 10 2 m1 01BD201LM2 013Ir-0BD251LFP 13Ir-0BD202LM2 023Ir-0BD252LFP 23Ir-0BD203LM2 033Ir-0BD253LFP 33Ir-0BD204LM2 043Ir-0BD254LFP 43Ir-0BD205LM2 053Ir-0BD255LFP 53Ir-0BD206LM2 063Ir-0BD256LFP 63Ir-0BD207LM2 073Ir-0BD257LFP 73Ir-0BD208LM2 083Ir-0BD258LM4 72IrA N11BD209LM2 093Ir-0BD259LM4 72IrA N21BD210LM2 103Ir-0BD260LM4 72IrA N31BD211LM2 113Ir-0BD261LM4 72IrA N41BD212LM2 123Ir-0BD262LM4 72IrA N51BD213LM2 133Ir-0BD263LM1 12Pt-0BD214LM2 143Ir-0BD264LM1 32Pt-0BD215LM2 153Ir-0BD265LM1 52Pt-0BD216LM2 163Ir-0BD266LM4 52Pt-0BD217LM2 173Ir-0BD267LM4 72Pt-0BD218LM2 183Ir-0BD268LM4 92Pt-0BD219LM2 193Ir-0BD269LM9 82Pt-0BD220LM2 203Ir-0BD270LM1 002Pt-0BD221LM2 213Ir-0BD271LM1 022Pt-0BD222LM2 223Ir-0BD272LM1 322Pt-0BD223LM2 233Ir-0BD273LM1 342Pt-0BD224LM2 243Ir-0BD274LM1 362Pt-0BD225LM2 253Ir-0BD275LM1 512Pt-0BD226LM2 263Ir-0BD276LM1 532Pt-0BD227LM2 273Ir-0BD277LM1 582Pt-0BD228LM2 283Ir-0BD278LM1 802Pt-0BD229LM2 293Ir-0BD279LM1 822Pt-0BD230LM2 303Ir-0BD280LM1 872Pt-0BD231LM2 313Ir-0BD281LM2 012Pt-0BD232LM2 323Ir-0BD282LM2 062Pt-0BD233LM2 333Ir-0BD283LM2 112Pt-0BD234LM2 343Ir-0BD284LM2 332Pt-0BD235LM2 353Ir-0BD285LM2 352Pt-0BD236LM2 363Ir-0BD286LM2 402Pt-0BD237LM2 373Ir-0BD287LFM 52Pt-0BD238LM2 383Ir-0BD288LFM 62Pt-0BD239LM2 393Ir-0BD289LFM 72Pt-0BD240LM2 403Ir-0BD290LFP 52Pt-0BD241LM2 413Ir-0BD291LFP 62Pt-0BD242LM2 423Ir-0BD292LFP 72Pt-0BD243LM2 433Ir-0BD293LM4 71PtA N11BD244LFM 13Ir-0BD294LM4 71PtA N21BD245LFM 23Ir-0BD295LM4 71PtA N31BD246LFM 33Ir-0BD296LM4 71PtA N41BD247LFM 43Ir-0BD297LM4 71PtA N51BD248LFM 53Ir-0BD249LFM 63Ir-0BD250LFM 73Ir-0

[0191] Referring to Tables 2 to 4, LM1 to LM243 may respectively be understood by referring to Formulae 1-1 to 1-3 and Tables 5 to 7: Table 5Formula 1-1LigandR 11 R 12 R 13 R 14 R 15 R 16 R 17 R 18 R 19 R 20 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 Table 6 Formula 1-2LigandR 11 X 11 R 10 1 R 10 2 R 10 3 R 10 4 R 1 4 R 15 R 1 6 R 17 R 1 8 R 1 9 R 2 0 LFM1Y1 0N-PhDDDDDY1 0DDDDDLFM2Y1 0SDDDDDY1 0DDDDDLFM3Y1 0ODDDDDY1 0DDDDDLFM4Y3ODDDDDY3DDDDDLFM5Y1 0ODDDDDY1 0DDDDDLFM6Y1 0ODDDDDY1 0DY3DDDLFM7Y1 0ODDDDDY1 0DY1 2DDD Table 7 Formula 1-3LigandR 11 X 11 R 10 1 R 10 2 R 10 3 R 10 4 R 1 4 R 15 R 1 6 R 17 R 1 8 R 1 9 R 2 0 LFP1Y1 0N-PhDDDDDY1 0DDDDDLFP2Y1 0SDDDDDY1 0DDDDDLFP3Y1 0ODDDDDY1 0DDDDDLFP4Y3ODDDDDY3DDDDDLFP5Y1 0ODDDDDY1 0DDDDDLFP6Y1 0ODDDDDY1 0DY3DDDLFP7Y1 0ODDDDDY1 0DY1 2DDD

[0192] In Tables 5 to 7, X1 to X10 and Y1 to Y18 are the same as described below, and Ph represents a phenyl group:

[0193] In one or more embodiments, the sensitizer may be represented by Formula 101 or 102, and in this regard, the sensitizer may be referred to as a delayed fluorescence sensitizer:

[0194] In Formulae 101 and 102, A 21 may be an acceptor group, D 21 may be a donor group, m21 may be 1, 2, or 3, and n21 may be 1, 2, or 3, the sum of n21 and m21 in Formula 101 may be 6 or less, and the sum of n21 and m21 in Formula 102 may be 5 or less, R 21 may be hydrogen, deuterium, -F, -Cl, -Br, -I, SF 5 , a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 7 -C 60 alkylaryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 alkylheteroaryl group, a substituted or unsubstituted C 2 -C 60 heteroaryl alkyl group, a substituted or unsubstituted C 1 -C 60 heteroaryloxy group, a substituted or unsubstituted C 1 -C 60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, Si(Q 1 )(Q 2 )(Q 3 ), - Ge(Q 1 )(Q 2 )(Q 3 ), -C(Q 1 )(Q 2 )(Q 3 ), -B(Q 1 )(Q 2 ), -N(Q 1 )(Q 2 ), -P(Q 1 )(Q 2 ), - C(=O)(Q 1 ), -S(=O)(Q 1 ), -S(=O) 2 (Q 1 ), -P(=O)(Q 1 )(Q 2 ), or -P(=S)(Q 1 )(Q 2 ), wherein a plurality of R 21 may optionally be linked together to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, and Q 1 to Q 3 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 7 -C 60 alkylaryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a C 2 -C 60 alkyl heteroaryl group, a C 1 -C 60 heteroaryloxy group, a C 1 -C 60 heteroarylthio group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group that is substituted with at least one deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof, or a C 6 -C 60 aryl group that is substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 6 -C 60 aryl group, or a combination thereof.

[0195] For example, in Formulae 101 and 102, A 21 may be a substituted or unsubstituted π electron-depleted nitrogen-free cyclic group.

[0196] In an embodiment, the π electron-depleted nitrogen-free cyclic group may be: a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthylene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, a hexacene group, a pentacene group, a rubicene group, a corogen group, an ovalene group, a pyrrole group, an isoindole group, an indole group, a furan group, a thiophene group, a benzofuran group, a benzothiophene group, a benzocarbazole group, a dibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group, a dibenzothiophene sulfone group, a carbazole group, a dibenzosilole group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, a triindolobenzene group; or a condensed cyclic group of two or more π electron-depleted nitrogen-free cyclic groups, but embodiments of the present disclosure are not limited thereto.

[0197] In an embodiment, in Formulae 101 and 102, D 21 may be: -F, a cyano group, or a π electron-depleted nitrogen-containing cyclic group; a C 1 -C 60 alkyl group, a π electron-depleted nitrogen-containing cyclic group, or a π electron-depleted nitrogen-free cyclic group, each substituted with at least one -F, a cyano group, or a combination thereof; or a π-electron depleted nitrogen-containing cyclic group substituted with at least one deuterium, a C 1 -C 60 alkyl group, a π electron depleted nitrogen-containing cyclic group, a π electron-depleted nitrogen-free cyclic group, or a combination thereof.

[0198] In detail, the π electron-depleted nitrogen-free cyclic group may be the same as described herein.

[0199] The term "π electron-depleted nitrogen-containing cyclic group" as used herein refers to a cyclic group having at least one *-N=*' moiety, and for example, may be: an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, an azacarbazole group, or a benzimidazolobenzimidazole group; or a condensed cyclic group in which two or more π electron-efficient nitrogen-containing cyclic groups are condensed with each other.

[0200] In one or more embodiments, the sensitizer may be compounds of Groups XI to XV, but embodiments of the present disclosure are not limited thereto: [Hole transport region 12]

[0201] In the organic light-emitting device 10, the hole transporting region 12 may be arranged between the first electrode 11 and the emission layer 15.

[0202] The hole transport region 12 may have a single-layered structure or a multilayered structure.

[0203] For example, the hole transport region 12 may have a hole injection layer structure, a hole transport layer structure, a hole injection layer / hole transport layer structure, a hole injection layer / first hole transport layer / second hole transport layer structure, a hole transport layer / interlayer structure, a hole injection layer / hole transport layer / interlayer structure, a hole transport layer / electron blocking layer structure, or a hole injection layer / hole transport layer / electron blocking layer structure, but embodiments of the present disclosure are not limited thereto.

[0204] The hole transport region 12 may include any compound having hole-transporting properties.

[0205] For example, the hole transport region 12 may include an amine-based compound.

[0206] In an embodiment, the hole transport region 12 may include at least one compound represented by Formulae 201 to 205, but embodiments of the present disclosure are not limited thereto:

[0207] In Formulae 201 to 205, L 201 to L 209 may each independently *-be O-*', *-S-*', a substituted or unsubstituted C 5 -C 60 carbocyclic group, or a substituted or unsubstituted C 1 -C 60 heterocyclic group, xa1 to xa9 may each independently be an integer from 0 to 5, and R 201 to R 206 may each independently be a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent aromatic condensed polycyclic group, a substituted or unsubstituted monovalent aromatic condensed heteropolycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, or a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, wherein neighboring two groups of R 201 to R 206 may optionally be linked to each other via a single bond, a dimethyl-methylene group, or a diphenyl-methylene group.

[0208] For example, L 201 to L 209 may each independently be a benzene group, a pentalene group, an indene group, a naphthalene group, an azulene group, a heptalene group, an indacene group, an acenaphthylene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, a hexacene group, a pentacene group, a rubicene group, a corogen group, an ovalene group, a pyrrole group, an isoindole group, an indole group, a furan group, a thiophene group, a benzofuran group, a benzothiophene group, a benzocarbazole group, a dibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group, a dibenzothiophene sulfone group, a carbazole group, a dibenzosilole group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, or a triindolobenzene group, each unsubstituted or substituted with at least one deuterium, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a naphthyl group, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a triphenylenyl group, a biphenyl group, a terphenyl group, a tetraphenyl group, -Si(Q 11 )(Q 12 )(Q 13 ), or any combination thereof, xa1 to xa9 may each independently be 0, 1, or 2, R 201 to R 206 may each independently be 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-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an indeno carbazolyl group, an indolocarbazolyl group, a benzofurocarbazolyl group, or a benzothienocarbazolyl group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy 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 phenyl group substituted with a C 1 -C 10 alkyl group, a phenyl group substituted with -F, 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-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, - Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), or any combination thereof, and Q 11 to Q 13 and Q 31 to Q 33 may each independently be a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group.

[0209] In one or more embodiments, the hole transport region 12 may include a carbazole-containing amine-based compound.

[0210] In one or more embodiments, the hole transport region 12 may include a carbazole-containing amine-based compound and a carbazole-free amine-based compound.

[0211] The carbazole-containing amine-based compound may be, for example, a compound represented by Formula 201 including a carbazole group and further including at least one of a dibenzofuran group, a dibenzothiophene group, a fluorene group, a spiro-bifluorene group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, or any combination thereof.

[0212] The carbazole-free amine-based compound may be, for example, a compound represented by Formula 201 which does not include a carbazole group and which includes at least one of a dibenzofuran group, a dibenzothiophene group, a fluorene group, a spiro-bifluorene group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, or any combination thereof.

[0213] In one or more embodiments, the hole transport region 12 may include at least one compound represented by Formulae 201 or 202.

[0214] In an embodiment, the hole transport region 12 may include at least one compound represented by Formulae 201-1, 202-1, or 201-2, but embodiments of the present disclosure are not limited thereto:

[0215] In Formulae 201-1, 202-1, and 201-2, L 201 to L 203 , L 205 , xa1 to xa3, xa5, R 201 and R 202 may respectively be the same as described herein, and R 211 to R 213 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C 1 -C 10 alkyl group, a phenyl group substituted with -F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group, a triphenylenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, or a pyridinyl group.

[0216] For example, the hole transport region 12 may include at least one of Compounds HT1 to HT39, but embodiments of the present disclosure are not limited thereto:

[0217] In one or more embodiments, the hole transport region 12 may include at least one of 4,4'-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC), tris(4-carbazoyl-9-ylphenyl)amine (TCTA), or any combination thereof.

[0218] In one or more embodiments, the hole transport region 12 of the organic light-emitting device 10 may further include a p-dopant. When the hole transport region 12 further includes a p-dopant, the hole transport region 12 may have a structure including a matrix (for example, at least one of compounds represented by Formulae 201 to 205) and a p-dopant included in the matrix. The p-dopant may be uniformly or non-uniformly doped in the hole transport region 12.

[0219] For example, a lowest unoccupied molecular orbital (LUMO) energy level of the p-dopant may be about -3.5 eV or less.

[0220] The p-dopant may include at least one a quinone derivative, a metal oxide, a cyano group-containing compound, or any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0221] In an embodiment, the p-dopant may include at least one of: a quinone derivative, such as tetracyanoquinodimethane (TCNQ),2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), and F6-TCNNQ; a metal oxide, such as tungsten oxide or molybdenum oxide; 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN); a compound represented by Formula 221, or any combination thereof, but embodiments of the present disclosure are not limited thereto:

[0222] In Formula 221, R 221 to R 223 may each independently be a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent aromatic condensed polycyclic group, a substituted or unsubstituted monovalent aromatic condensed heteropolycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, or a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, wherein at least one of R 221 to R 223 may have at least one of a cyano group, - F, -Cl, -Br, -I, a C 1 -C 20 alkyl group substituted with -F, a C 1 -C 20 alkyl group substituted with -Cl, a C 1 -C 20 alkyl group substituted with -Br, a C 1 -C 20 alkyl group substituted with -I, or any combination thereof.

[0223] The hole transport region 12 may have a thickness in a range of about 100 Å to about 10,000 Å, for example, about 400 Å to about 2,000 Å, and the emission layer 15 may have a thickness in a range of about 100 Å to about 3,000 Å, for example, about 300 Å to about 1,000 Å. When the thickness of each of the hole transport region 12 and the emission layer 15 is within these ranges, satisfactory hole transportation characteristics and / or luminescence characteristics may be obtained without a substantial increase in driving voltage.[Electron transport region 17]

[0224] The electron transport region 17 is arranged between the emission layer 15 and the second electrode 19 of the organic light-emitting device 10.

[0225] The electron transport region 17 may have a single-layered structure or a multi-layered structure.

[0226] For example, the electron transport region 17 may have an electron transport layer structure, an electron transport layer / electron injection layer structure, a buffer layer / electron transport layer structure, hole blocking layer / electron transport layer structure, a buffer layer / electron transport layer / electron injection layer structure, or a hole blocking layer / electron transport layer / electron injection layer structure, but embodiments of the present disclosure are not limited thereto. The electron transport region 17 may further include an electron control layer.

[0227] The electron transport region 17 may include a known electron-transporting material.

[0228] The electron transport region 17 (for example, a buffer layer, a hole blocking layer, an electron control layer, or an electron transport layer in the electron transport region) may include a metal-free compound containing at least one π electron-depleted nitrogen-containing cyclic group. The π electron-depleted nitrogen-containing cyclic group may be the same as described above.

[0229] In an embodiment, the electron transport region 17 may include a compound represented by Formula 601:         Formula 601     [Ar 601 ] xe11 -[(L 601 ) xe1 -R 601 ] xe21 wherein, in Formula 601, Ar 601 and L 601 may each independently be a substituted or unsubstituted C 5 -C 60 carbocyclic group or a substituted or unsubstituted C 1 -C 60 heterocyclic group, xe11 may be 1, 2, or 3, xe1 may be an integer from 0 to 5, R 601 may be a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent aromatic condensed heteropolycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - Si(Q 601 )(Q 602 )(Q 603 ), -C(=O)(Q 601 ), -S(=O) 2 (Q 601 ), or -P(=O)(Q 601 )(Q 602 ), Q 601 to Q 603 may each independently be a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group, and xe21 may be an integer from 1 to 5.

[0230] In an embodiment, at least one of Ar 601 (s) in the number of xe11 and R 601 (s) in the number of xe21 may include the π electron-depleted nitrogen-containing cyclic group.

[0231] In an embodiment, Ar 601 and L 601 in Formula 601 may each independently be a benzene group, a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyrimidine group, a pyridazine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, -Si(Q 31 )(Q 32 )(Q 33 ), -S(=O) 2 (Q 31 ), -P(=O)(Q 31 )(Q 32 ), or any combination thereof, and Q 31 to Q 33 may each independently be a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group.

[0232] When xe11 in Formula 601 is 2 or more, two or more of Ar 601 may be linked together via a single bond.

[0233] In one or more embodiments, Ar 601 in Formula 601 may be an anthracene group.

[0234] In one or more embodiments, the compound represented by Formula 601 may be represented by Formula 601-1:

[0235] In Formula 601-1, X 614 may be N or C(R 614 ), X 615 may be N or C(R 615 ), X 616 may be N or C(R 616 ), and at least one of X 614 to X 616 may be N, L 611 to L 613 may each independently be the same as described in connection with L 601 , xe611 to xe613 may each independently be the same as described in connection with xe1, R 611 to R 613 may each independently be the same as described in connection with R 601 , and R 614 to R 616 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group.

[0236] In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and 601-1 may each independently be 0, 1, or 2.

[0237] In one or more embodiments, R 601 and R 611 to R 613 in Formulae 601 and 601-1 may each independently be: a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, or an azacarbazolyl group, each unsubstituted or substituted with at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolyl group, or any combination thereof; and -S(=O) 2 (Q 601 ) or -P(=O)(Q 601 )(Q 602 ), and Q 601 and Q 602 may respectively be the same as described above.

[0238] In an embodiment, the electron transport region 17 may include at least one compound of Compounds ET1 to ET36, but embodiments of the present disclosure are not limited thereto:

[0239] In one or more embodiments, the electron transport region 17 may include at least one compound of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq 3 , BAlq, 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ), 2,2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi), NTAZ, or any combination thereof:

[0240] Thicknesses of the buffer layer, the hole blocking layer, and the electron control layer may each independently be in a range of about 20 Å to about 1,000 Å, for example, about 30 Å to about 300 Å. When the thicknesses of the buffer layer, the hole blocking layer, and the electron control layer are within these ranges, excellent hole blocking characteristics or excellent electron control characteristics may be obtained without a substantial increase in driving voltage.

[0241] A thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. When the thickness of the electron transport layer is within these ranges, satisfactory electron transporting characteristics may be obtained without a substantial increase in driving voltage.

[0242] The electron transport region 17 (for example, the electron transport layer in the electron transport region) may further include, in addition to the materials described above, a metal-containing material.

[0243] The metal-containing material may include at least one of an alkali metal complex, an alkaline earth-metal complex, or a combination thereof. The alkali metal complex may include a metal ion of a Li ion, a Na ion, a K ion, a Rb ion, a Cs ion, or any combination thereof, and the alkaline earth-metal complex may include a metal ion of a Be ion, a Mg ion, a Ca ion, a Sr ion, a Ba ion, or any combination thereof. A ligand coordinated with the metal ion of the alkali metal complex or the alkaline earth-metal complex may be a hydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, a hydroxy acridine, a hydroxy phenanthridine, a hydroxy phenyloxazole, a hydroxy phenylthiazole, a hydroxy diphenyloxadiazole, a hydroxy diphenylthiadiazole, a hydroxy phenylpyridine, a hydroxy phenylbenzimidazole, a hydroxy phenylbenzothiazole, a bipyridine, a phenanthroline, or a cyclopentadiene, but embodiments of the present disclosure are not limited thereto.

[0244] In an embodiment, the metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (lithium quinolate (LiQ)) or ET-D2:

[0245] The electron transport region 17 may include an electron injection layer that facilitates the injection of electrons from the second electrode 19. The electron injection layer may directly contact the second electrode 19.

[0246] The electron injection layer may have i) a single-layered structure including a single layer including a single material, ii) a single-layered structure including a single layer including a plurality of different materials, or iii) a multi-layered structure having a plurality of layers including a plurality of different materials.

[0247] The electron injection layer may include an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combinations thereof.

[0248] The alkali metal may be Li, Na, K, Rb, or Cs. In an embodiment, the alkali metal may be Li, Na, or Cs. In one or more embodiments, the alkali metal may be Li or Cs, but embodiments of the present disclosure are not limited thereto.

[0249] The alkaline earth metal may be Mg, Ca, Sr, or Ba.

[0250] The rare earth metal may be Sc, Y, Ce, Tb, Yb, or Gd.

[0251] The alkali metal compound, the alkaline earth-metal compound, and the rare earth metal compound may be an oxide or a halide (for example, fluorides, chlorides, bromides, or iodides) of the alkali metal, the alkaline earth-metal, or the rare earth metal.

[0252] The alkali metal compound may be an alkali metal oxide, such as Li 2 O, Cs 2 O, or K 2 O, or alkali metal halides, such as LiF, NaF, CsF, KF, Lil, Nal, Csl, or KI. In an embodiment, the alkali metal compound may be LiF, Li 2 O, NaF, Lil, Nal, Csl, or KI, but embodiments of the present disclosure are not limited thereto.

[0253] The alkaline earth-metal compound may be an alkaline earth-metal oxide, such as BaO, SrO, CaO, Ba x Sr 1-x O (0<x<1), or Ba x Ca 1-x O (0<x<1). In an embodiment, the alkaline earth-metal compound may be BaO, SrO, or CaO, but embodiments of the present disclosure are not limited thereto.

[0254] The rare earth metal compound may be YbF 3 , ScF 3 , ScO 3 , Y 2 O 3 , Ce 2 O 3 , GdF 3 , or TbF 3 . In an embodiment, the rare earth metal compound may be YbF 3 , ScF 3 , TbF 3 , YbI 3 , ScI 3 , or TbI 3 , but embodiments of the present disclosure are not limited thereto.

[0255] The alkali metal complex, the alkaline earth-metal complex, and the rare earth metal complex may include an ion of an alkali metal, an alkaline earth-metal, or a rare earth metal as described above, and a ligand coordinated with a metal ion of the alkali metal complex, the alkaline earth-metal complex, or the rare earth metal complex may be hydroxy quinoline, hydroxy isoquinoline, hydroxy benzoquinoline, hydroxy acridine, hydroxy phenanthridine, hydroxy phenyloxazole, hydroxy phenylthiazole, hydroxy diphenyloxadiazole, hydroxy diphenylthiadiazole, hydroxy phenylpyridine, hydroxy phenylbenzimidazole, hydroxy phenylbenzothiazole, bipyridine, phenanthroline, or cyclopentadiene, but embodiments of the present disclosure are not limited thereto.

[0256] The electron injection layer may comprise of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combinations thereof, as described above. In one or more embodiments, the electron injection layer may further include an organic material. When the electron injection layer further includes an organic material, an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combination thereof may be homogeneously or non-homogeneously dispersed in a matrix including the organic material.

[0257] A thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å, for example, about 3 Å to about 90 Å. When the thickness of the electron injection layer is within these ranges, satisfactory electron injection characteristics may be obtained without a substantial increase in driving voltage.[Second electrode 19]

[0258] The second electrode 19 is arranged on the organic layer 10A having such a structure. The second electrode 19 may be a cathode which is an electron injection electrode, and in this regard, a material for forming the second electrode 19 may be a metal, an alloy, an electrically conductive compound, or a combination thereof, which have a relatively low work function.

[0259] The second electrode 19 may include at least one lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesiumindium (Mg-In), magnesium-silver (Mg-Ag), ITO, IZO, or any combination thereof, but embodiments of the present disclosure are not limited thereto. The second electrode 19 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.

[0260] The second electrode 19 may have a single-layered structure having a single layer or a multi-layered structure including two or more layers.

[0261] Hereinbefore, the organic light-emitting device has been described with reference to FIG. 1, but embodiments of the present disclosure are not limited thereto.

[0262] Description of FIG. 2

[0263] FIG. 2 is a schematic cross-sectional view of an organic light-emitting device 100 according to another exemplary embodiment.

[0264] The organic light-emitting device 100 of FIG. 2 includes a first electrode 110, a second electrode 190 facing the first electrode 110, and a first emitting unit 151 and a second emitting unit 152 between the first electrode 110 and the second electrode 190. A charge generation layer 141 is arranged between the first emitting unit 151 and the second emitting unit 152, and the charge generation layer 141 may include an n-type charge generation layer 141-N and a p-type charge generation layer 141-P. The charge generation layer 141 is a layer that generates a charge and supplies the charge to neighboring emitting units, and any known material may be used therefor.

[0265] The first emitting unit 151 may include a first emission layer 151-EM, and the second emitting unit 152 may include a second emission layer 152-EM. A maximum emission wavelength of light emitted from the first emitting unit 151 may be different from a maximum emission wavelength of light emitted from the second emitting unit 152. For example, the mixed light including the light emitted from the first emitting unit 151 and the light emitted from the second emitting unit 152 may be white light, but embodiments of the present disclosure are not limited thereto.

[0266] The hole transport region 120 is arranged between the first emitting unit 151 and the first electrode 110, and the second emitting unit 152 may include a first hole transport region 121 arranged on the side of the first electrode 110.

[0267] An electron transport region 170 is arranged between the second emitting unit 152 and the second electrode 190, and the first emitting unit 151 may include a first electron transport region 171 arranged between the charge generation layer 141 and the first emission layer 151-EM.

[0268] The first emission layer 151-EM may include the heterocyclic compound.

[0269] The second emission layer 152-EM may include the heterocyclic compound.

[0270] The first electrode 110 and the second electrode 190 illustrated in FIG. 2 may be the same as described in connection with the first electrode 11 and the second electrode 19 illustrated in FIG. 1.

[0271] The first emission layer 151-EM and the second emission layer 152-EM illustrated in FIG. 2 may each be the same as described in connection with the emission layer 15 illustrated in FIG. 1.

[0272] The hole transport region 120 and the first hole transport region 121 illustrated in FIG. 2 may each be the same as described in connection with the hole transport region 12 illustrated in FIG. 1.

[0273] The electron transport region 170 and the first electron transport region 171 illustrated in FIG. 2 may each be the same as described in connection with the electron transport region 17 illustrated in FIG. 1.

[0274] As described above, referring to FIG. 2, the organic light-emitting device in which each of the first emitting unit 151 and the second emitting unit 152 includes the emission layer including the host, the dopant, and the sensitizer, has been described. However, the organic light-emitting device may have various other forms. For example, one of the first emitting unit 151 and the second emitting unit 152 of the organic light-emitting device 100 of FIG. 2 may be replaced with any known emitting unit, or may include three or more emitting units.[Description of FIG. 3]

[0275] FIG. 3 is a schematic cross-sectional view of an organic light-emitting device 200 according to another exemplary embodiment.

[0276] The organic light-emitting device 200 includes a first electrode 210, a second electrode 290 facing the first electrode 210, and a first emission layer 251 and a second emission layer 252 which are stacked between the first electrode 210 and the second electrode 290.

[0277] A maximum emission wavelength of light emitted from the first emission layer 251 may be different from a maximum emission wavelength of light emitted from the second emission layer 252. For example, the mixed light of the light emitted from the first emission layer 251 and the light emitted from the second emission layer 252 may be white light, but embodiments of the present disclosure are not limited thereto.

[0278] In an embodiment, a hole transport region 220 may be arranged between the first emission layer 251 and the first electrode 210, and an electron transport region 270 may be arranged between the second emission layer 252 and the second electrode 290.

[0279] The first emission layer 251 may include the heterocyclic compound.

[0280] The second emission layer 252 may include the heterocyclic compound.

[0281] The first electrode 210, the hole transport region 220, and the second electrode 290 illustrated in FIG. 3 may each be the same as described in connection with the first electrode 11, the hole transport region 12, and the second electrode 19 illustrated in FIG. 1.

[0282] The first emission layer 251 and the second emission layer 252 illustrated in FIG. 3 may each be the same as described in connection with the emission layer 15 illustrated in FIG. 1.

[0283] The electron transport region 270 illustrated in FIG. 3 may be the same as described in connection with the electron transport region 17 illustrated in FIG. 1.

[0284] As described above, referring to FIG. 3, the organic light-emitting device in which both the first emission layer 251 and the second emission layer 252 include the heterocyclic compound has been described. However, any one of the two emission layers 251 and 252 in the organic light-emitting device may be replaced with a known layer, the organic light-emitting device may include three or more emission layers, or the organic light-emitting device may further include an interlayer arranged between neighboring emission layers. As such, various modifications of the organic light-emitting device may be provided.Electronic apparatus

[0285] The organic light-emitting device may be included in various electronic apparatuses.

[0286] The electronic apparatus may further include a thin-film transistor in addition to the organic light-emitting device as described above. The thin-film transistor may include a source electrode, a drain electrode, and an activation layer, wherein any one of the source electrode and the drain electrode may be electrically connected to any one of the first electrode and the second electrode of the organic light-emitting device.Explanation of terms

[0287] The term "C 1 -C 60 alkyl group" as used herein refers to a linear or branched saturated aliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms, and examples thereof 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 isoamyl group, and a hexyl group. The term "C 1 -C 60 alkylene group" as used herein refers to a divalent group having the same structure as the C 1 -C 60 alkyl group.

[0288] The term "C 1 -C 60 alkoxy group" as used herein refers to a monovalent group represented by -OA 101 (wherein A 101 is the C 1 -C 60 alkyl group), and examples thereof are a methoxy group, an ethoxy group, an isopropyloxy group, and the like.

[0289] The term "C 2 -C 60 alkenyl group" as used herein refers to a hydrocarbon group formed by substituting at least one carbon-carbon double bond in the middle or at the terminus of the C 2 -C 60 alkyl group, and examples thereof are an ethenyl group, a propenyl group, a butenyl group, and the like. The term "C 2 -C 60 alkenylene group" as used herein refers to a divalent group having the same structure as the C 2 -C 60 alkenyl group.

[0290] The term "C 2 -C 60 alkynyl group" as used herein refers to a hydrocarbon group formed by substituting at least one carbon-carbon triple bond in the middle or at the terminus of the C 2 -C 60 alkyl group, and examples thereof are an ethynyl group, a propynyl group, and the like. The term "C 2 -C 60 alkynylene group" as used herein refers to a divalent group having the same structure as the C 2 -C 60 alkynyl group.

[0291] The term "C 3 -C 10 cycloalkyl group" as used herein refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and examples thereof are a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and the like. The term "C 3 -C 10 cycloalkylene group" as used herein refers to a divalent group having the same structure as the C 3 -C 10 cycloalkyl group.

[0292] The term "C 1 -C 10 heterocycloalkyl group" as used herein refers to a monovalent saturated monocyclic group having at least one heteroatom of N, O, P, Si, S, B, Se, Ge, Te or a combination thereof as a ring-forming atom and 1 to 10 carbon atoms, and examples thereof are a tetrahydrofuranyl group, a tetrahydrothiophenyl group, and the like. The term "C 1 -C 10 heterocycloalkylene group" as used herein refers to a divalent group having the same structure as the C 1 -C 10 heterocycloalkyl group.

[0293] The term "C 3 -C 10 cycloalkenyl 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 the ring thereof and no aromaticity, and examples thereof are a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, and the like. The term "C 3 -C 10 cycloalkenylene group" as used herein refers to a divalent group having the same structure as the C 3 -C 10 cycloalkenyl group.

[0294] The term "C 1 -C 10 heterocycloalkenyl group" as used herein refers to a monovalent monocyclic group that has at least one heteroatom N, O, P, Si, S, B, Se, Ge, Te or a combination thereof as a ring-forming atom, 1 to 10 carbon atoms, and at least one carbon-carbon double bond in its ring. Examples of the C 1 -C 10 heterocycloalkenyl group are a 2,3-dihydrofuranyl group, a 2,3-dihydrothiophenyl group, and the like. The term "C 1 -C 10 heterocycloalkenylene group" as used herein refers to a divalent group having the same structure as the C 1 -C 10 heterocycloalkenyl group.

[0295] The term "C 6 -C 60 aryl group" as used herein refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and the term "C 6 -C 60 arylene group" as used herein refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Examples of the C 6 -C 60 aryl group are a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, a chrysenyl group, and the like. When the C 6 -C 60 aryl group and the C 6 -C 60 arylene group each include two or more rings, the two or more rings may be fused to each other.

[0296] The term "C 1 -C 60 heteroaryl group" as used herein refers to a monovalent group having a heterocarbocyclic aromatic system that has at least one heteroatom N, O, P, Si, and S as a ring-forming atom, and 1 to 60 carbon atoms. The term "C 1 -C 60 heteroarylene group" as used herein refers to a divalent group having a carbocyclic aromatic system that has at least one heteroatom N, O, P, S, B, Se, Ge, Te, or a combination thereof as a ring-forming atom, and 1 to 60 carbon atoms. Examples of the C 1 -C 60 heteroaryl group include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, and the like. When the C 6 -C 60 heteroaryl group and the C 6 -C 60 heteroarylene group each include two or more rings, the two or more rings may be fused to each other.

[0297] The term "C 6 -C 60 aryloxy group" as used herein indicates -OA 102 (wherein A 102 is the C 6 -C 60 aryl group), and the term "C 6 -C 60 arylthio group" as used herein indicates -SA 103 (wherein A 103 is the C 6 -C 60 aryl group).

[0298] The "(C 1 -C 20 alkyl)'X' group" refers to a 'X' group substituted with at least one C 1 -C 20 alkyl group. For example, The "(C 1 -C 20 alkyl)C 3 -C 10 cycloalkyl group" as used herein refers to a C 3 -C 10 cycloalkyl group substituted with at least one C 1 -C 20 alkyl group, and the "(C 1 -C 20 alkyl)phenyl group" as used herein refers to a phenyl group substituted with at least one C 1 -C 20 alkyl group. Examples of the (C 1 alkyl)phenyl group may include a toluyl group.

[0299] The term "monovalent aromatic condensed polycyclic group" as used herein refers to a monovalent group including two or more rings that are condensed with each other, including only carbon as a ring-forming atom (for example, 8 to 60 carbon atoms), and having aromaticity throughout its entire molecular structure. The term "divalent aromatic condensed polycyclic group" as used herein refers to a divalent group having the same structure as the monovalent aromatic condensed polycyclic group described above.

[0300] The term "monovalent aromatic condensed heteropolycyclic group" as used herein refers to a monovalent group having two or more rings condensed to each other, a heteroatom N, O, P, Si, S, B, Se, Ge, Te, or a combination thereof other than carbon atoms (for example, having 1 to 60 carbon atoms), as a ring-forming atom, and no aromaticity throughout its entire molecular structure. The term "divalent aromatic condensed heteropolycyclic group" as used herein refers to a divalent group having the same structure as the monovalent aromatic condensed heteropolycyclic group described above.

[0301] The term "monovalent aromatic condensed polycyclic group" as used herein refers to a monovalent group including two or more rings that are condensed with each other, including only carbon as a ring-forming atom (for example, 8 to 60 carbon atoms), and having non-aromaticity throughout its entire molecular structure. Examples of the monovalent non-aromatic condensed polycyclic group are a fluorenyl group and the like. The term "divalent non-aromatic condensed polycyclic group" as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group described above.

[0302] The term "monovalent non-aromatic condensed heteropolycyclic group" as used herein refers to a monovalent group having two or more rings condensed to each other, including a heteroatom N, O, P, Si, S, B, Se, Ge, Te, or a combination thereof other than carbon atoms (for example, 1 to 60 carbon atoms), as a ring-forming atom, and having no aromaticity throughout its entire molecular structure. Examples of the monovalent non-aromatic condensed heteropolycyclic group are a carbazolyl group and the like. The term "divalent non-aromatic condensed heteropolycyclic group" as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group described above.

[0303] The term "π electron-depleted nitrogen-containing C 1 -C 60 cyclic group" as used herein refers to a cyclic group having 1 to 60 carbon atoms and including at least one *-N=*' (wherein * and *' each indicate a binding site to a neighboring atom) as a ring-forming moiety, and examples thereof are a) first ring, b) a condensed cyclic group in which two or more first rings are condensed with each other, or c) a condensed cyclic group in which at least one first ring is condensed with at least one second ring.

[0304] The term "π electron-rich C 3 -C 60 cyclic group" as used herein refers to a cyclic group having 3 to 60 carbon atoms and not including *-N=*' (wherein * and *' each indicate a binding site to a neighboring atom) as a ring-forming moiety, examples thereof are a) a second ring or b) a condensed cyclic group in which two or more second rings are condensed with each other.

[0305] The term "C 5 -C 60 carbocyclic group" as used herein refers to a monocyclic group or a polycyclic group, each having 5 to 60 carbon atoms, and examples thereof are a) a third ring or b)a condensed cyclic group in which two or more third rings are condensed with each other.

[0306] The term "C 1 -C 60 heterocyclic group" as used herein refers to a monocyclic group or a polycyclic group, each having 1 to 60 carbon atoms, and examples thereof are a) a fourth ring, b) a condensed cyclic group in which two or more fourth rings are condensed with each other, or c) a condensed cyclic group in which at least one third ring and at least one four ring are condensed with each other.

[0307] The term "first ring" as used herein may be an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, or a thiadiazole group.

[0308] The term "second ring" as used herein may be a benzene group, a cyclopentadiene group, a pyrrole group, a furan group, a thiophene group, or a silole group.

[0309] The term "third ring" as used herein may be a cyclopentane group, a cyclopentadiene group, an indene group, an adamantane group, a norbornene group, a bicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane group, a bicyclo[2.2.1]heptane group (a norbornane group)), a bicyclo[2.2.2]octane group, a cyclohexane group, a cyclohexene group, or a benzene group.

[0310] The term "fourth ring" as used herein may be a furan group, a thiophene group, a pyrrole group, a silole group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, a triazasilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, or a triazine group.

[0311] For example, the π electron-depleted nitrogen-containing C 1 -C 60 cyclic group may be an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyridazine group, a pyrimidine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a benzoisoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a benzoquinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, a benzoisoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, an acridine group, or a pyridopyrazine group.

[0312] For example, the π electron-rich C 3 -C 60 cyclic group may be a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthylene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentacene group, a hexacene group, a pentaphene group, a rubicene group, a coronene group, an ovalene group, a pyrrole group, a furan group, a thiophene group, an isoindole group, an indole group, an indene group, a benzofuran group, a benzothiophene group, a benzosilole group, a naphthopyrrole group, a naphthofuran group, a naphthothiophene group, a naphthosilole group, a benzocarbazole group, a dibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a dibenzosilole group, an indenocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, a benzosilolocarbazole group, a triindolobenzene group, a pyrrolophenanthrene group, a furanophenanthrene group, a thienophenanthrene group, a benzonaphthofuran group, a benzonaphthothiophene group, an (indolo)phenanthrene group, a (benzofuran)phenanthrene group, or a (benzothieno)phenanthrene group.

[0313] For example, the C 6 -C 60 carbocyclic group may be a cyclopentane group, a cyclohexane group, a cyclohexene group, a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a 1,2,3,4-tetrahydronaphthalene group, a cyclopentadiene group, an indene group, a fluorene group, a 5,6,7,8-tetrahydroisoquinoline group, a 5,6,7,8-tetrahydroquinoline group, an adamantane group, a norbornane group, or a norbornene group.

[0314] For example, the C 1 -C 60 heterocyclic group may be a thiophene group, a furan group, a pyrrole group, a cyclopentadiene group, a silole group, a borole group, phosphole group, a selenophene group, a germole group, a benzothiophene group, a benzofuran group, an indole group, an indene group, a benzosilole group, a benzoborole group, a benzophosphole group, a benzoselenophene group, a benzogermole group, a dibenzothiophene group, a dibenzofuran group, a carbazole group, a dibenzosilole group, a dibenzoborole group, a dibenzophosphole group, a dibenzoselenophene group, a dibenzogermole group, a dibenzothiophene 5-oxide group, a 9H-fluoren-9-one group, a dibenzothiophene 5,5-dioxide group, an azabenzothiophene group, an azabenzofuran group, an azaindole group, an azaindene group, an azabenzosilole group, an azabenzoborole group, an azabenzophosphole group, an azabenzoselenophene group, an azabenzogermole group, an azadibenzothiophene group, an azadibenzofuran group, an azacarbazole group, an azafluorene group, an azadibenzosilole group, an azadibenzoborole group, an azadibenzophosphole group, an azadibenzoselenophene group, an azadibenzogermole group, an azadibenzothiophene 5-oxide group, an aza-9H-fluoren-9-one group, an azadibenzothiophene 5,5-dioxide group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group, or a benzothiadiazole group.

[0315] The π electron-depleted nitrogen-containing C 1 -C 60 cyclic group, the π electron-rich C 3 -C 60 cyclic group, the C 6 -C 60 cyclic group, and the C 1 -C 60 heterocyclic group may each be a part of a condensed cycle or a monovalent, a divalent, a trivalent, a tetravalent, a pentavalent, or a hexavalent group, depending on the formula structure.

[0316] A substituent of at least one of the substituted C 5 -C 30 carbocyclic group, the substituted C 1 -C 30 heterocyclic group, the substituted C 1 -C 60 alkyl group, the substituted C 2 -C 60 alkenyl group, the substituted C 2 -C 60 alkynyl group, the substituted C 1 -C 60 alkoxy group, the substituted C 3 -C 10 cycloalkyl group, the substituted C 1 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 1 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 7 -C 60 alkylaryl group, the substituted C 6 -C 60 aryloxy group, the substituted C 6 -C 60 arylthio group, the substituted C 1 -C 60 heteroaryl group, the substituted monovalent aromatic condensed polycyclic group, the substituted C 2 -C 60 alkylheteroaryl group, the substituted C 1 -C 60 heteroaryloxy group, the substituted C 1 -C 60 heteroarylthio group, the substituted monovalent aromatic condensed heteropolycyclic group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be: deuterium, -F, -Cl, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group; a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD 3 , -CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, - N(Q 11 )(Q 12 ), -Si(Q 13 )(Q 14 )(Q 15 ), -B(Q 16 )(Q 17 ), -P(=O)(Q 18 )(Q 19 ), or any combination thereof; a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group; a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD 3 , - CD 2 H, -CDH 2 , -CF 3 , -CF 2 H, -CFH 2 , a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, - N(Q 21 )(Q 22 ), -Si(Q 23 )(Q 24 )(Q 25 ), -B(Q 26 )(Q 27 ), -P(=O)(Q 26 )(Q 29 ), or any combination thereof; or -N(Q 31 )(Q 32 ), -Si(Q 33 )(Q 34 )(Q 35 ), -B(Q 36 )(Q 37 ), or -P(=O)(Q 38 )(Q 39 ), and Q 1 to Q 9 , Q 11 to Q 19 , Q 21 to Q 29 , and Q 31 to Q 39 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryl group substituted with at least one a C 1 -C 60 alkyl group, and a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group.

[0317] As used herein, the number of carbons in each group that is substituted (e.g., C 1 -C 60 ) excludes the number of carbons in the substituent. For example, a C 1 -C 60 alkyl group can be substituted with a C 1 -C 60 alkyl group. The total number of carbons included in the C 1 -C 60 alkyl group substituted with the C 1 -C 60 alkyl group is not limited to 60 carbons. In addition, more than one C 1 -C 60 alkyl substituent may be present on the C 1 -C 60 alkyl group. This definition is not limited to the C 1 -C 60 alkyl group and applies to all substituted groups that recite a carbon range.

[0318] The term "room temperature" as used herein refers to a temperature of about 25 °C.

[0319] The terms "a biphenyl group, a terphenyl group, and a tetraphenyl group" as used herein each refer to a monovalent group having two, three, and four phenyl groups linked via single bonds, respectively.

[0320] The terms "a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, and a cyano-containing tetraphenyl group" as used herein respectively refer to a phenyl group, a biphenyl group, a terphenyl group, and a tetraphenyl group, each of which is substituted with at least one cyano group. In "a cyano-containing phenyl group, a cyano-containing biphenyl group, a cyano-containing terphenyl group, and a cyano-containing tetraphenyl group", a cyano group may be substituted to any position of the corresponding group, and the "cyano-containing phenyl group, the cyano-containing biphenyl group, the cyano-containing terphenyl group, and the cyano-containing tetraphenyl group" may further include substituents other than a cyano group. For example, a phenyl group substituted with a cyano group and a phenyl group substituted with a cyano group and a methyl group may all belong to "a cyano-containing phenyl group".

[0321] Hereinafter, a compound and an organic light-emitting device according to embodiments are described in detail with reference to Synthesis Examples and Examples. However, the organic light-emitting device is not limited thereto. The wording "'B' was used instead of 'A'" used in describing Synthesis Examples means that an amount of 'A' used was identical to an amount of 'B' used, in terms of a molar equivalent.ExamplesSynthesis Example 1: Synthesis of Compound 1

[0322] (1) Synthesis of Intermediate 1-1

[0323] In a 100 ml round-bottom flask, N-(5-(9H-carbazol-9-yl)-2,3-dichlorophenyl)-N-([1,1'-biphenyl]-4-yl)-[1,1'-biphenyl]-4-amine (3.3 g, 5.19 mmol), 6,12-diphenyl-9H-tribenzo[b,d,f]azepine (1.95 g, 4.93 mmol), Pd(dba) 2 (0.3 g, 0.52 mmol), SPhos (0.21 g, 0.52 mmol), and NaOtBu (0.75 g, 7.78 mmol) were mixed with toluene (31 ml), and the mixed solution was stirred by heating at 120 °C for 2 hours in a nitrogen atmosphere. The solvent of the reaction mixture obtained therefrom was removed using a rotary evaporator, and dichloromethane (200 ml) was added thereto to dissolve the reaction product. A washing process was performed thereon twice with water (200 ml), and water was removed using anhydrous MgSO 4 , and the solvent was removed using a rotary evaporator. The resulting product was then purified by silica gel column chromatography (dichloromethane / n-hexane), so as to obtain, as Intermediate 1-1, N-(5-(9H-carbazol-9-yl)-2-chloro-3-(6,12-diphenyl-9H-tribenzo[b,d,f]azepin-9-yl)phenyl)-N-([1,1'-biphenyl]-4-yl)-[1,1'-biphenyl]-4-amine (2.94 g). Intermediate 1-1 thus obtained was identified by LC-MS. C 72 H 48 Cl 1 N 3 : 990.311(2) Synthesis of Compound 1

[0324] In a 250 ml round-bottom flask, Intermediate 1-1 (4.67 g, 4.71 mmol) was mixed with t-butylbenzene (94 ml), and 1.6 M tert-BuLi pentane solution (7.4 ml, 11.77 mmol) was added thereto at -78 °C in a nitrogen atmosphere. The reaction temperature was raised to 60 °C, and then, the mixed solution was stirred for 1 hour. The reaction solution was cooled to -40 °C, and BBr 3 (0.91 ml, 9.42 mmol) was added thereto and stirred at room temperature for 1 hour. Afterwards, the reaction solution was cooled to -40 °C again, and N,N-diisopropylethylamine(1.81 ml, 10.36 mmol) was added thereto and stirred by heating at 120 °C for 4 hours. After the reaction solution was cooled to room temperature, saturated aqueous solution of NaOAc and ethyl acetate (200 ml) were added thereto. A washing process was performed thereon using water (300 ml), and the organic layer was dried using anhydrous MgSO 4 . The solvent of the reaction product was removed using a rotary evaporator, and the resultant product was then purified by silica gel column chromatography (dichloromethane / n-hexane), so as to obtain Compound 1 (1.5 g). Compound 1 thus obtained was confirmed by LC-MS. C 72 H 46 BN 3 : 964.333Example 1-1

[0325] An ITO glass substrate was cut to a size of 50 mm x 50 mm x 0.5 mm, sonicated in acetone isopropyl alcohol and pure water, each for 15 minutes, and then, washed by exposure to ultraviolet (UV) light ozone for 30 minutes.

[0326] Subsequently, HAT-CN was deposited on the ITO electrode (anode) on the glass substrate to form a hole injection layer having a thickness of 100 Å, NPB was deposited on the hole injection layer to form a first hole transport layer having a thickness of 500 Å, TCTA was deposited on the first hole transport layer to form a second hole transport layer having a thickness of 50 Å, and mCP was deposited on the second hole transport layer to form an electron blocking layer having a thickness of 50 Å.

[0327] A first host (Compound H1), a second host (Compound H2), and a sensitizer (Compound 1) were co-deposited on the electron blocking layer to form an emission layer having a thickness of 400 Å. Here, the first host and the second host were mixed at a ratio of 60:40, and the amount of the emitter was adjusted to be 3 wt% based on the total weight of the first host, the second host, and the emitter.

[0328] DBFPO was deposited on the emission layer to form a hole blocking layer having a thickness of 100 Å, DBFPO and LiQ were co-deposited thereon at a weight ratio of 5:5 to form an electron transport layer having a thickness of 300 Å, LiQ was deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, an then, Al was deposited on the electron injection layer to form a cathode having a thickness of 1,000 Å, thereby completing the manufacture of an organic light-emitting device. Comparative Example 1-1

[0329] An organic light-emitting device was manufactured in the same manner as in Example 1-1, except that, in forming an emission layer, for use as a dopant, corresponding compounds shown in Table 3 were used.Example 2-1

[0330] A glass substrate with an ITO electrode arranged thereon was cut to a size of 50 mm x 50 mm x 0.5 mm, sonicated in acetone isopropyl alcohol and pure water, each for 15 minutes, and then, washed by exposure to UV ozone for 30 minutes.

[0331] Subsequently, HAT-CN was deposited on the ITO electrode (anode) on the glass substrate to form a hole injection layer having a thickness of 100 Å, NPB was deposited on the hole injection layer to form a first hole transport layer having a thickness of 500 Å, TCTA was deposited on the first hole transport layer to form a second hole transport layer having a thickness of 50 Å, and mCP was deposited on the second hole transport layer to form an electron blocking layer having a thickness of 50 Å.

[0332] A first host (Compound H1), a second host (Compound H2), a sensitizer (Compound S-1), and an emitter (Compound 1) were co-deposited on the electron blocking layer to form an emission layer having a thickness of 400 Å. Here, the first host and the second host were mixed at a ratio of 60:40, and the amounts of the sensitizer and the emitter were adjusted to be 15 wt% and 1 wt%, respectively, based on the total weight of the first host, the second host, the sensitizer, and the emitter.

[0333] DBFPO was deposited on the emission layer to form a hole blocking layer having a thickness of 100 Å, DBFPO was deposited on the emission layer to form a hole blocking layer having a thickness of 100 Å, DBFPO and LiQ were co-deposited thereon at a weight ratio of 5:5 to form an electron transport layer having a thickness of 300 Å, LiQ was deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, an then, Al was deposited on the electron injection layer to form a cathode having a thickness of 1,000 Å, thereby completing the manufacture of an organic light-emitting device, and then DBFPO and LiQ were co-deposited thereon at a weight ratio of 5:5 to form an electron transport layer having a thickness of 300 Å, and then, LiQ was deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, and Al was deposited on the electron injection layer to form a cathode having a thickness of 1,000 Å, thereby completing the manufacture of an organic light-emitting device. Comparative Examples 2-1 and 2-2

[0334] Organic light-emitting devices were manufactured in the same manner as in Example 2 -1, except that, in forming an emission layer, for use as a sensitizer and a dopant, corresponding compounds shown in Table 7 were used.Evaluation Example: Evaluation of organic light-emitting device characteristics

[0335] The driving voltage, maximum external quantum efficiency, power efficiency, current efficiency, CIE color coordinates (at 1000 nit), conversion efficiency, and full width at half maximum of the organic light emitting devices manufactured in Examples and Comparative Examples above were measured using a current-voltage meter (Keithley 2400) and a luminance meter (Minolta Cs-1000A), and results thereof are summarized in Tables 8 and 9. Table 8DopantDriving voltage (V)EQE max (%)Lifespan (T95) (%)Example 1-114.46264531Comparative Example 1-1C15.56100100 Table 9 SensitizerDopantDriving voltage (V)EQE max (%)Lifespan (T95) (%)Example 2-1S-114.191471052Comparative Example 2-1S-1C14.59100100Comparative Example 2-2S-1C24.4374116

[0336] Referring to Tables 8 and 9, it was confirmed that the organic light-emitting device of Examples above had higher efficiency and / or longer lifespan than the organic light-emitting devices of Comparative Examples above.

[0337] In addition, referring to Tables 8 and 9, it was confirmed that the heterocyclic compound was applicable to all organic light-emitting devices that emit light through various mechanisms.

[0338] As described above, according to the one or more embodiments, an organic light-emitting device including a heterocyclic compound may have improved efficiency and / or excellent colorimetric purity.

[0339] It should be understood that embodiments 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 one or more embodiments. While one or more embodiments 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 scope as defined by the following claims.

Claims

1. A heterocyclic compound represented by Formula 1-1 or 1-2: wherein, in Formulae 1-1 and 1-2, A11 to A16 are each independently a substituted or unsubstituted C5-C30 carbocyclic group or a substituted or unsubstituted C1-C30 heterocyclic group, X11 to X16 are each independently a group represented by Formula 2-1 or 2-2, n11 to n16 are each independently 0, 1, or 2, the sum of n11 to n16 in Formula 1-1 is 1 or more, and the sum of n11 to n15 in Formula 1-2 is 1 or more, Y11 to Y16 are each independently a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, or a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, m11 to m16 are each independently 0, 1, or 2, the sum of n11 to n16 and m11 to m16 in Formula 1-1 is 2 or more, and the sum of n11 to n15 and m11 to m15 in Formula 1-2 is 2 or more, Z11 to Z16 are each independently a carbon atom, and a bond between Z11 and Z12, a bond between Z13 and Z14, and a bond between Z15 and Z16 are each independently a single bond or a double bond, wherein, in Formulae 2-1 and 2-2, X21 is a single bond, O, S, N(R25), or C(R25)(R26), L21 and L22 are each independently a substituted or unsubstituted C5-C30 carbocyclic group or a substituted or unsubstituted C1-C30 heterocyclic group, a21 and a22 are each independently 0, 1, or 2, R21 and R22 are each independently a substituted or unsubstituted C6-C60 aryl group, R11 to R18 and R23 to R26 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, -SF5, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl 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 C2-C60 alkylheteroaryl group, a substituted or unsubstituted C1-C60 heteroaryloxy group, a substituted or unsubstituted C1-C60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -C(Q1)(Q2)(Q3), -B(Q1)(Q2), - N(Q1)(Q2), -P(Q1)(Q2), -C(=O)(Q1), -S(=O)(Q1), -S(=O)2(Q1), -P(=O)(Q1)(Q2), or - P(=S)(Q1)(Q2), b11 to b16 are each independently 0, 1, 2, or 3, b23 and b24 are each independently 0, 1, 2, 3, or 4, Q1 to Q3 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a C1-C60 heteroaryloxy group, a C1-C60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one deuterium, -F, a cyano group, a C1-C60 alkyl group, a C6-C60 aryl group, or a combination thereof, or a C6-C60 aryl group that is substituted with deuterium, -F, a cyano group, a C1-C60 alkyl group, a C6-C60 aryl group, or a combination thereof, * indicates a binding site to a neighboring atom, and the substituted C5-C30 carbocyclic group, the substituted C1-C30 heterocyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C7-C60 alkylaryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted C2-C60 alkylheteroaryl group, the substituted C1-C60 heteroaryloxy group, the substituted C1-C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group are substituted with: deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group; a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic 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), -P(=O)(Q18)(Q19), or any combination thereof; a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, or 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, 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 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 aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -N(Q21)(Q22), -Si(Q23)(Q24)(Q25), -B(Q26)(Q27), - P(=O)(Q26)(Q29), or any combination thereof; or -N(Q31)(Q32), -Si(Q33)(Q34)(Q35), -B(Q36)(Q37), or -P(=O)(Q38)(Q39), and Q11 to Q19, Q21 to Q29, and Q31 to Q39 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryl group substituted with at least one a C1-C60 alkyl group, and a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent aromatic condensed polycyclic group, a monovalent aromatic condensed heteropolycyclic group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group.

2. The heterocyclic compound of claim 1, wherein the heterocyclic compound is represented by one of Formulae 1-111 and 1-211: wherein, in Formulae 1-111 and 1-211, R110 to R114 are each independently X11, Y11, or R11, R121 to R124 are each independently X12, Y12, or R12, R131 to R133 are each independently X13, Y13, or R13, R141 to R143 are each independently X14, Y14, or R14, R151 to R154 are each independently X15, Y15, or R15, R161 to R164 are each independently X16, Y16, or R16, at least one of R110 to R114, R121 to R124, R131 to R133, R141 to R143, and R151 to R154 is X11, X12, X13, X14, or X15, at least two of R110 to R114, R121 to R124, R131 to R133, R141 to R143, and R151 to R154 are X11, X12, X13, X14, X15, Y11, Y12, Y13, Y14, or Y15, and X11 to X16, Y11 to Y16, and R11 to R18 are respectively the same as described in claim 1.

3. The heterocyclic compound of claims 1 or 2, wherein X11 to X16 are each independently a group represented by Formula 2-11 or 2-21: wherein, in Formulae 2-11 and 2-21, L21 and L22 are respectively the same as described in claim 1, a21 and a22 are each independently 0 or 1, and R201 to R218 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, -SF5, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, or a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group.

4. The heterocyclic compound of any of claims 1-3, wherein X11 to X16 are each independently represented by one of Formulae 2-111 to 2-122: wherein, in Formulae 2-111 to 2-122, t-Bu represents a tert-butyl group, and * indicates a binding site to a neighboring atom.

5. The heterocyclic compound of any of claims 1-4, wherein Y11 to Y16 are each independently a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group, a (C1-C20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, or a chrysenyl group, each substituted or unsubstituted with deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, 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-C20 alkyl group, a deuterated C2-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a (C1-C20)cyclopentyl group, a (C1-C20 alkyl)cyclohexyl group, a (C1-C20 alkyl)cycloheptyl group, a (C1-C20 alkyl)cyclooctyl group, a (C1-C20 alkyl)adamantanyl group, a (C1-C20 alkyl)norbornanyl group, a (C1-C20 alkyl)norbornenyl group, a (C1-C20)cyclopentenyl group, a (C1-C20)cyclohexenyl group, a (C1-C20 alkyl)cycloheptenyl group, a (C1-C20 alkyl)bicyclo[1.1.1]pentyl group, a (C1-C20 alkyl)bicyclo[2.1.1]hexyl group, a (C1-C20 alkyl)bicyclo[2.2.1]heptyl group, a (C1-C20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C1-C20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, or any combination thereof.

6. The heterocyclic compound of any of claims 1-5, wherein the sum of n11 to n15 in Formulae 1-1 and 1-2 is 1 or 2; and / or wherein the sum of m11 to m16 in Formula 1-1 is 1 or more and the sum of m11 to m15 in Formula 1-2 is 1 or more; and / or wherein, in Formulae 1-1 and 1-2, the sum of n11 to n15 and m11 to m15 is 2, 3, 4, or 5.

7. The heterocyclic compound of any of claims 1-6, wherein the heterocyclic compound is represented by one of Formulae 1-11 to 1-24 and 1-31 to 1-44: wherein, in Formulae 1-11 to 1-24 and 1-31 to 1-44, A11 to A16, X11 to X15, Y11 to Y15, Z11 to Z16, R11 to R18, and b11 to b16 are respectively the same as described in claim 1, n11 to n15 are each independently 1 or 2, m11 to m15 are each independently 0, 1, or 2, and the sum of n11 to n15 and m11 to m15 is 2 or more.

8. The heterocyclic compound of claim 1, wherein the heterocyclic compound is of Compounds 1 to 78:

9. An organic light-emitting device comprising: a first electrode; a second electrode; and an organic layer arranged between the first electrode and the second electrode and comprising an emission layer, wherein the organic layer comprises the heterocyclic compound of any of claims 1-8.

10. The organic light-emitting device of claim 9, wherein the emission layer comprises the heterocyclic compound.

11. The organic light-emitting device of claim 10, wherein the emission layer further comprises a host and an emitter, the host and the emitter are different from each other, and the emitter comprises the heterocyclic compound.

12. The organic light-emitting device of claim 11, wherein the emission layer emits blue light; and / or wherein the emitter is a fluorescent emitter and / or a delayed fluorescence emitter.

13. The organic light-emitting device of claim 10, wherein the emission layer further comprises a host, an emitter, and a sensitizer, the host, the emitter, and the sensitizer are different from each other, and the emitter comprises the heterocyclic compound; preferably wherein the emission layer emits blue light.

14. The organic light-emitting device of claim 13, wherein the emitter is a fluorescent emitter and / or a delayed fluorescence emitter; and / or wherein the sensitizer and the heterocyclic compound satisfy Condition 5: 0 μs < T decay HC < 5 μs wherein, in Condition 5, Tdecay(HC) indicates a decay time of the heterocyclic compound.

15. An electronic apparatus comprising the organic light-emitting device of any of claims 9-14.