Organic Light-Emitting Device

Abstract

An organic light emitting device is disclosed, which includes: a first electrode; a second electrode; and an organic layer disposed between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first compound satisfying the following conditions 1 to 4, where ΔE ST , ΔE ST2 and ΔE' TT are defined in the specification: <Condition 1> ΔE ST > ΔE ST2 + ΔE' TT <Condition 2> 0 eV < ΔE ST2 + ΔE' TT ≤ 1.0 eV <Condition 3> 0 eV < ΔE' TT ≤ 0.15 eV <Condition 4> ΔE ST2 > 0 eV.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority and benefit of Korean Patent Application No. 10 - 2019 - 0107649, filed with the Korean Intellectual Property Office on August 30, 2019, the entire content of which is incorporated herein by reference. Technical Field

[0003] One or more embodiments relate to an organic light - emitting device including an emission layer containing a first compound. Background Art

[0004] An organic light - emitting device (OLED) is a self - emissive device that has a wide viewing angle, high contrast ratio, short response time, and excellent characteristics in terms of brightness, driving voltage, and response speed compared to conventional devices and produces a full - color image.

[0005] Examples of organic light - emitting devices may include an anode, a cathode, and an organic layer disposed between the anode and the cathode and including an emission layer. Such an organic light - emitting device may include a hole - transport region between the anode and the emission layer, and an electron - transport region 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 electrons recombine in the emission layer to generate excitons. These excitons may transition from an excited state to a ground state, thereby generating light. Summary of the Invention

[0006] One or more embodiments include an organic light - emitting device including an emission layer containing a first compound.

[0007] Additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the provided embodiments.

[0008] One aspect of the present disclosure provides an organic light - emitting device including: a first electrode; a second electrode; and an organic layer disposed between the first electrode and the second electrode and including an emission layer,

[0009] wherein the emission layer includes a first compound satisfying the following Conditions 1 to 4:

[0010] <Condition 1>

[0011] ΔE ST >ΔE ST2 +ΔE' TT

[0012] <Condition 2>

[0013] 0eV < ΔE ST2+ΔE' TT ≤1.0 eV

[0014] <Condition 3>

[0015] eV < ΔE' TT ≤0.15 eV

[0016] <Condition 4>

[0017] ΔE ST2 > 0 eV.

[0018] Among Conditions 1 to 4,

[0019] ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound;

[0020] ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound; and

[0021] ΔE' TT represents the difference between the second lowest singlet excitation energy level calculated for the T2 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound.

[0022] Another aspect of the present disclosure provides an organic light-emitting device, which includes: a first electrode; a second electrode; m light-emitting units disposed between the first electrode and the second electrode and including at least one emission layer; and

[0023] m - 1 charge generation layers disposed between two adjacent light-emitting units among the m light-emitting units and including an n-type charge generation layer and a p-type charge generation layer,

[0024] where m is an integer of 2 or greater,

[0025] the maximum emission wavelength of the light emitted from at least one of the m light-emitting units is different from the maximum emission wavelength of the light emitted from at least one of the remaining light-emitting units, and

[0026] the emission layer includes a first compound that satisfies the above Conditions 1 to 4.

[0027] Another aspect of the present disclosure provides an organic light-emitting device, which includes: a first electrode; a second electrode; and m emission layers disposed between the first electrode and the second electrode,

[0028] where m is an integer of 2 or greater,

[0029] the maximum emission wavelength of light emitted from at least one of the m emission layers is different from the maximum emission wavelength of light emitted from at least one of the remaining emission layers, and

[0030] the emission layer includes a first compound satisfying the above conditions 1 to 4. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following description of embodiments of the present disclosure in conjunction with the accompanying drawings will make these and / or other aspects clearer and easier to understand, where:

[0032] Figure 1 is a schematic diagram of an organic light emitting device 10 according to an exemplary embodiment;

[0033] Figure 2 is a schematic diagram of an organic light emitting device 100 according to another exemplary embodiment; and

[0034] Figure 3 is a schematic diagram of an organic light emitting device 200 according to another exemplary embodiment. DETAILED DESCRIPTION

[0035] Embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings, where like reference numerals always refer to like elements and repeated descriptions may not be provided. In this regard, the present embodiments may have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the embodiments are described below only by referring to the accompanying drawings to illustrate aspects of the present description. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one (kind) of" and "one of" when before or after a list of elements modify the entire list of elements and not individual elements of the list.

[0036] 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, no intervening elements are present.

[0037] 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. Thus, without departing from the teachings herein, a "first element", "component", "region", "layer", or "section" discussed below could be termed a second element, component, region, layer, or section.

[0038] The terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used herein, the indefinite articles "a", "an", the definite article "the", and "at least one" do not denote a limitation of quantity and are intended to cover both the singular and the plural, unless the context clearly dictates otherwise. For example, "an element" has the same meaning as "at least one element", unless the context clearly dictates otherwise.

[0039] "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" or "comprising", when used in this specification, specify the presence of the stated features, regions, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components, and / or groups thereof.

[0040] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another as shown in the figures. It will be understood that relative terms are also intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one of the figures is turned over, an element described as on the "lower" side of another element will then be oriented on the "upper" side of the other element. Thus, depending on the specific orientation of the figure, the exemplary term "lower" can include both the "lower" and the "upper" orientations. Similarly, if the device in one of the figures is turned over, an element described as "beneath" or "under" another element will then be oriented "above" the other element. Thus, the exemplary terms "beneath" or "under" can include both the "above" and the "beneath" orientations.

[0041] As used herein, "about" or "approximately" includes the stated value and means within an acceptable deviation range for a particular value as determined by one of ordinary skill in the art in view of the measurements discussed and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within the ranges of ±30%, 20%, 10%, or 5%.

[0042] 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 consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted in an idealized or overly formal sense unless clearly so defined herein.

[0043] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. As such, deviations from the shape of the figures as a result of, for example, manufacturing techniques and / or tolerances are to be expected. Accordingly, the embodiments described herein should not be construed as limited to the specific shapes of regions illustrated herein, but include deviations in shape that result, for example, from manufacturing. For example, regions illustrated or described as flat may typically have rough and / or non-linear features. Moreover, sharp corners illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the exact shape of a region and are not intended to limit the scope of the claims.

[0044] Figure 1 description

[0045] Figure 1 is a schematic view of an organic light emitting device 10 according to an exemplary embodiment. Hereinafter, with respect to Figure 1 the structure of an organic light emitting device according to an embodiment and a method of manufacturing an organic light emitting device according to an embodiment will be described.

[0046] Figure 1 The organic light emitting device 10 includes a first electrode 11, a second electrode 19 facing the first electrode 11, and an organic layer disposed between the second electrode 19 and the first electrode 11.

[0047] The organic layer may include an emission layer 15. A hole transport region may be disposed between the first electrode 11 and the emission layer 15, and an electron transport region may be disposed between the emission layer 15 and the second electrode 19.

[0048] Alternatively, a substrate may be provided under the first electrode 11 or above the second electrode 19. As the substrate, substrates used in typical organic light-emitting devices may be used, and they may be glass substrates or plastic substrates each having excellent mechanical strength, thermal stability, transparency, surface smoothness, handleability, and water resistance.

[0049] The first electrode 11

[0050] The first electrode 11 may be 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 having a high work function to facilitate hole injection.

[0051] The first electrode 11 may be a reflective electrode, a semi-reflective electrode, or a transmissive electrode. When the first electrode 11 is a transmissive electrode, the material for forming the first electrode may be indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), or any combination thereof, but the 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 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 the embodiments of the present disclosure are not limited thereto.

[0052] The first electrode 11 may have a single-layer structure or a multi-layer structure including two or more layers.

[0053] The emission layer 15

[0054] The emission layer 15 may include a first compound.

[0055] In one or more embodiments, the emission layer 15 may include a first compound, and the first compound may satisfy the following conditions 1 to 4:

[0056] <Condition 1>

[0057] ΔE ST >ΔE ST2 +ΔE' TT

[0058] <Condition 2>

[0059] 0 eV < ΔE ST2 +ΔE' TT ≤1.0 eV

[0060] <Condition 3>

[0061] eV < ΔE' TT ≤0.15 eV

[0062] <Condition 4>

[0063] ΔE ST2 > 0 eV.

[0064] Among the above Conditions 1 to 4,

[0065] ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound;

[0066] ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound; and

[0067] ΔE' TT represents the difference between the second lowest singlet excitation energy level calculated for the T2 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound.

[0068] The specific calculation method is as follows.

[0069] To calculate the reverse intersystem crossing (RISC) rate between the triplet and singlet states, the following Equation 1 based on the Fermi Golden Rule is used:

[0070] <Equation 1>

[0071]

[0072] In Equation 1, h represents the Planck constant, and P ν (T) represents the Boltzmann distribution in the triplet oscillatory state at temperature T, E ν and E ν′ represent the triplet oscillatory energy and the singlet oscillatory energy, respectively, and H′ M represents the perturbation Hamiltonian matrix element corresponding to the triplet magnetic quantum numbers (M = 0, ±1). The perturbation Hamiltonian is characterized by the spin - orbit interaction of electrons and the non - Born - Oppenheimer effect, and is represented by the following Equation 2:

[0073] <Equation 2>

[0074]

[0075] When extended to the second-order terms, the matrix elements in Equation 2 can be represented by the following Equation 3:

[0076] <Equation 3>

[0077]

[0078] Equation 3 assumes that all triplet excited states (k = 1, 2, …) are true.

[0079] To obtain the analytical value of Equation 1, the time-correlation function in the time domain is calculated by introducing the Fourier transform and then its inverse transform is taken.

[0080] Specifically, the Fourier transform is performed on the time integration interval of [-6553.6:6553.6] fs with a time interval of 0.1 femtoseconds (fs) using the FFTW library described by M. Frigo and S. G. Johnson, Proc. IEEE, 93, 216 - 231 (2005) and incorporated herein by reference.

[0081] The molecular structure is optimized by using the Turbomole program described by Furche et al., WIRESs: Comput. Mol. Sci. 4, 91 - 100 (2014) and incorporated herein by reference.

[0082] For the structural optimization of the T1, T2, and S1 states, time-dependent density functional theory (DFT) utilizing the PBE0 functional within the Tamm-Dancoff approximation is used. To obtain the normal mode, frequency calculations are performed, and then the lowest energy structure is determined. The non-adiabatic coupling between the excited triplet state and the T1 state is calculated by using the Q-Chem program described by Y. Shao et al., Mol. Phys. 113, 184 - 215 (2015) and incorporated herein by reference. Additionally, the Q-Chem program is also used to calculate the spin-orbit coupling between TDDFT states by using the one-electron Breit-Pauli spin-orbit operator. For all atoms, the def2-SVP basis set is used.

[0083] Generally, only those with a relatively small ΔE ST are known to emit thermally activated delayed fluorescence. However, according to the present disclosure, even if the first compound has a relatively large ΔE ST , the first compound satisfying Conditions 1 to 4 can emit thermally activated delayed fluorescence, thereby improving the efficiency of the organic light-emitting device including the first compound.

[0084] In addition, when the first compound is used as a sensitizer, the energy transferred to the triplet state is changed to the singlet state by reverse intersystem crossing. Then, when the singlet state energy of the first compound is transferred to the dopant by energy transfer, the efficiency and lifetime of the organic light-emitting device can be improved simultaneously.

[0085] Specifically, the first compound of the organic light-emitting device may further satisfy the following condition 5:

[0086] <Condition 5>

[0087] ΔE ST2 ≤0.1 eV.

[0088] In condition 5,

[0089] ΔE ST2 represents the difference between the lowest singlet state excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet state excitation energy level calculated for the T2 equilibrium structure of the first compound.

[0090] In one or more embodiments, the first compound of the organic light-emitting device may further satisfy the following condition 6:

[0091] <Condition 6>

[0092] ΔE ST >0.2 eV.

[0093] In condition 6,

[0094] ΔE ST represents the difference between the lowest singlet state excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet state excitation energy level calculated for the T1 equilibrium structure of the first compound.

[0095] That is, the organic light-emitting device of the present disclosure can emit thermally activated delayed fluorescence (TADF), even when ΔE ST is greater than 0.2 eV.

[0096] The thickness of the emission layer may be in the range of about to about For example, about to about When the thickness of the emission layer is within this range, excellent light-emitting characteristics can be obtained without a significant increase in the driving voltage.

[0097] First Embodiment

[0098] In the first embodiment, the first compound can be used as a fluorescent emitter.

[0099] According to the first embodiment, the emission layer consists only of the first compound; or

[0100] The emission layer may further include a host (hereinafter referred to as "host A", which is different from the first compound).

[0101] Therefore, according to the first embodiment, the ratio of the light emitted by the first compound to the total light emitted by the emission layer may be about 80% or more, for example, about 90% or more. For example, the ratio of the light emitted by the first compound to the total light emitted by the emission layer may be about 95% or more.

[0102] Here, the first compound emits fluorescence and / or delayed fluorescence, and the light emitted by the first compound may be the sum of the immediate emission of the first compound and the delayed fluorescence emission through reverse intersystem crossing. In addition, the host may not emit light.

[0103] In the first embodiment, when the emission layer further includes host A in addition to the first compound, the amount of the first 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 the amount of host A 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, but the embodiments of the present disclosure are not limited thereto.

[0104] In the first embodiment, when the emission layer further includes host A in addition to the first compound, host A and the first compound may satisfy the following condition A:

[0105] <Condition A>

[0106] E(H A ) S1 >E S1 .

[0107] In condition A,

[0108] E(H A ) S1 represents the lowest singlet excitation energy level of host A;

[0109] E S1 represents the lowest singlet excitation energy level of the first compound.

[0110] E(H A ) S1 and E S1 are evaluated by the DFT method of the Gaussian program using the structural optimization at the B3LYP / 6-31G(d,p) level.

[0111] When the first compound satisfies the above conditions 1 to 4 and the first compound and host A satisfy the above condition A, the first compound can emit fluorescence and / or delayed fluorescence. Therefore, the luminous efficiency of the organic light-emitting device including the first compound and host A can be improved.

[0112] For example, host A can be the host material described below, but the embodiments of the present disclosure are not limited thereto.

[0113] Second Embodiment

[0114] In the second embodiment, the first compound can be used as a sensitizer.

[0115] According to the second embodiment, the emission layer includes a host, a sensitizer, and a dopant, where the sensitizer can include the first compound. The dopant can be, for example, a fluorescent dopant or a thermally activated delayed fluorescence dopant.

[0116] Therefore, according to the second embodiment, the ratio of the light emitted by the dopant to the total light emitted by the emission layer can be about 80% or greater, for example, about 90% or greater (95% or greater in one or more embodiments). For example, the dopant can emit fluorescence. Additionally, the host and the first compound may not emit light respectively.

[0117] In the second embodiment, the emission layer is composed of a host, a dopant, and the first compound. That is, the emission layer does not further include other materials except for the host, the dopant, and the first compound.

[0118] More specifically, the description of the normal energy transfer of the organic light-emitting device including the emission layer composed of a host, a dopant, and the first compound is as follows.

[0119] The energy of the singlet excitons formed at a ratio of 25% in the host is transferred to the first compound through energy transfer, and the energy of the triplet excitons formed at a ratio of 75% in the host is transferred to the singlet and triplet states of the first compound. The energy transferred to the triplet state is changed to the singlet state through reverse intersystem crossing, and then the singlet energy of the first compound is transferred to the dopant through energy transfer. Therefore, by delivering both the singlet excitons and triplet excitons generated in the emission layer to the dopant, the obtained organic light-emitting device can have improved efficiency. In addition, since an organic light-emitting device with significantly reduced energy loss can be obtained, such an organic light-emitting device can also have improved lifetime characteristics.

[0120] In the emission layer, the amount of the first compound can be in the range of about 5 wt% to about 50 wt%, such as about 10 wt% to about 30 wt%, based on the total weight of the emission layer. When the amount is within this range, efficient energy transfer in the emission layer can be achieved, thereby realizing an organic light-emitting device having high efficiency and long lifetime.

[0121] In the emission layer, the amount of the dopant can be in the range of about 0.01 wt% to about 15 wt%, such as about 0.05 wt% to about 3 wt%, based on the total weight of the emission layer, but embodiments of the present disclosure are not limited thereto.

[0122] For example, in a second embodiment, when the dopant is a fluorescent dopant (hereinafter referred to as "fluorescent dopant B"), the host (hereinafter referred to as "host B"), the first compound, and the fluorescent dopant B may each satisfy the following condition B:

[0123] <Condition B>

[0124] E(H B ) S1 >E S1 >E(F B ) S1 .

[0125] In condition B,

[0126] E(H B ) S1 represents the lowest singlet excitation energy level of host B;

[0127] E S1 represents the lowest singlet excitation energy level of the first compound; and

[0128] E(F B ) S1 represents the lowest singlet excitation energy level of fluorescent dopant B.

[0129] E(H B ) S1 , E S1 and E(F B ) S1 are evaluated by the DFT method of the Gaussian program with structural optimization at the B3LYP / 6-31G(d,p) level.

[0130] When host B, the first compound, and fluorescent dopant B satisfy the above condition B, Forster energy transfer from the first compound to fluorescent dopant B can be promoted. Therefore, the light-emitting efficiency of the organic light-emitting device including host B, the first compound, and fluorescent dopant B can be improved.

[0131] The main body B and the first compound may each further satisfy the following condition C:

[0132] <Condition C>

[0133] E(H B ) T1 -E T1 > 0.05 eV.

[0134] In condition C,

[0135] E(H B ) T1 represents the lowest triplet excitation energy level of the main body B; and

[0136] E T1 represents the lowest triplet excitation energy level of the first compound.

[0137] E(H B ) T1 and E T1 are evaluated by the DFT method of the Gaussian program with structural optimization at the B3LYP / 6-31G(d,p) level.

[0138] In the second embodiment, when the above condition C is satisfied (for example, when E(H B ) T1 -E T1 is in the range of 0.10 eV or more and 0.65 eV or less), the energy of the triplet excitons generated by the sensitizer in the emission layer is not transferred to the main body B in the emission layer, thereby reducing the possibility that the triplet excitons are lost through a path different from emission. Therefore, the organic light-emitting device obtained thereby can have high efficiency.

[0139] The first compound and the fluorescent dopant B may each further satisfy the following condition D:

[0140] <Condition D>

[0141] E(F B ) S1 -E S1 < 0 eV.

[0142] In condition D,

[0143] E(F B ) S1 represents the lowest singlet excitation energy level of the fluorescent dopant B; and

[0144] E S1 represents the lowest singlet excitation energy level of the first compound.

[0145] E(F B ) S1 and ES1 It was evaluated by the DFT method of Gaussian program that performs structural optimization at the B3LYP / 6-31G(d,p) level.

[0146] In the second embodiment, when the above condition D is satisfied (for example, when E(F B ) S1 -E S1 is in the range of -0.4 eV or more and -0.05 eV or less), the energy of the singlet exciton generated by the sensitizer in the emission layer is immediately transferred to the fluorescent dopant B. In this regard, substantially, only the fluorescent dopant B emits light in the emission layer of the organic light-emitting device, thereby realizing a fluorescence emission spectrum with excellent color purity based on the fluorescent dopant B. In addition, fluorescence emission with a relatively short exciton lifetime can be achieved, thereby realizing an organic light-emitting device with high efficiency by suppressing low-efficiency roll-off (so-called roll-off phenomenon) at high brightness, which can be caused by the interaction between multiple excitons (exciton-exciton interaction) or the interaction between excitons and charges (such as holes or electrons) (exciton-polaron interaction). Furthermore, since the sensitizer has a short exciton lifetime, the possibility of chemical or physical deterioration occurring in the exciton state of the sensitizer can be reduced, and thus the organic light-emitting device that satisfies condition D can have improved durability.

[0147] The host of the second embodiment may be the host material described below, but the embodiments of the present disclosure are not limited thereto.

[0148] The dopant of the second embodiment may be the dopant material described below, but the embodiments of the present disclosure are not limited thereto.

[0149] The host in the emission layer 15

[0150] The host may not include metal atoms.

[0151] In one or more embodiments, the host may consist of one type of host. When the host consists of one type of host, the one type of host may be an amphoteric host, an electron-transporting host, a hole-transporting host, or any combination thereof described below.

[0152] In one or more embodiments, the host may be a mixture of two or more different hosts. For example, the host may be a mixture of an electron-transporting host and a hole-transporting host, a mixture of two different electron-transporting hosts, or a mixture of two different hole-transporting hosts. The electron-transporting host and the hole-transporting host can be understood by referring to their descriptions provided herein.

[0153] 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 not including an electron-transporting moiety.

[0154] The electron-transporting moiety may be a cyano group, a cyclic group containing nitrogen with a deficient π electron, a group represented by one of the following formulas, or any combination thereof:

[0155]

[0156] In the above formulas, *, *', and *" each represent a bonding site to an adjacent atom.

[0157] In one or more embodiments, the electron-transporting host in the emission layer 15 may include at least one cyano group, a cyclic group containing nitrogen with a deficient π electron, or any combination thereof.

[0158] In one or more embodiments, the electron-transporting host in the emission layer 15 may include at least one cyano group.

[0159] In one or more embodiments, the electron-transporting host in the emission layer 15 may include at least one cyano group and at least one cyclic group containing nitrogen with a deficient π electron.

[0160] 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 cyclic group not containing nitrogen with a deficient π electron and at least one electron-transporting moiety, and the hole-transporting host may include at least one cyclic group not containing nitrogen with a deficient π electron and may not include an electron-transporting moiety.

[0161] As used herein, the term "cyclic group containing nitrogen with a deficient π electron" refers to a cyclic group having at least one *-N=*' moiety, and may be, for example: an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, azole group, iso azole 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, benzo azole group, isobenz azole group, a triazole group, a tetrazole group, diazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, an azacarbazole group; or a fused ring of two or more cyclic groups containing nitrogen with a deficient π electron.

[0162] In one or more embodiments, the cyclic group without π-deficient nitrogen may be: a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthene 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 benzo[9,10]phenanthrene group, a pyrene group, a group, a tetracene 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, 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 indacarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothiophenocarbazole group, a triindolobenzene group; or a fused ring of two or more cyclic groups without π-deficient nitrogen, but the embodiments of the present disclosure are not limited thereto.

[0163] In one or more embodiments, the electron transport host may include a compound represented by the following formula E-1, and

[0164] the hole transport host may include a compound represented by the following formula H-1, but the embodiments of the present disclosure are not limited thereto:

[0165] <Formula E-1>

[0166] [Ar 301 xb11 -[(L 301 ) xb1 -R 301 xb21 .

[0167] In formula E-1,

[0168] Ar 301 may be a substituted or unsubstituted C5-C 60 carbocyclic group or a substituted or unsubstituted C1-C 60 heterocyclic group,

[0169] xb11 may be 1, 2 or 3,

[0170] L 301 may be a single bond, a group represented by one of the following formulas, a substituted or unsubstituted C5-C 60 carbocyclic group, a substituted or unsubstituted C1-C 60 heterocyclic group, or any combination thereof:

[0171]

[0172] ​​Wherein *, *' and *" in the above formula each represent a binding site with an adjacent atom,

[0173] xb1 can be an integer from 1 to 5.

[0174] R 301 It can be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, amidino, hydrazine, hydrazone, substituted or unsubstituted C1-C 60 Alkyl, substituted or unsubstituted C2-C 60 Alkenyl, substituted or unsubstituted C2-C 60 Alkynyl, substituted or unsubstituted C1-C 60 Alkoxy, substituted or unsubstituted C3-C 10 Cycloalkyl, substituted or unsubstituted C2-C 10 Heterocycloalkyl, substituted or unsubstituted C3-C 10 Cycloalkenyl, substituted or unsubstituted C2-C 10 Heterocycloalkenyl, substituted or unsubstituted C6-C 60 Aryl, substituted or unsubstituted C6-C 60 Aryloxy, substituted or unsubstituted C6-C 60 Arylthio, substituted or unsubstituted C1-C 60 heteroaryl, substituted or unsubstituted monovalent non-aromatic fused polycyclic group, substituted or unsubstituted monovalent non-aromatic fused 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 ),

[0175] xb21 can be an integer from 1 to 5.

[0176] Q 301 -Q 303 Can be C1-C 10 Alkyl, C1-C 10 alkoxy, phenyl, biphenyl, terphenyl, or naphthyl, and

[0177] The electron transport host can satisfy at least one of <Condition H-1> to <Condition H-3>:

[0178] <Condition H-1>

[0179] At least one Ar in Formula E-1 301 , L 301 and R 301 may each independently include a cyclic group containing nitrogen lacking π electrons.

[0180] <Condition H-2>

[0181] L in Formula E-1 301 may be a group represented by one of the following formulas:

[0182]

[0183] <Condition H-3>

[0184] R in Formula E-1 301 may be cyano, -S(=O)2(Q 301 ), -S(=O)(Q 301 ), -P(=O)(Q 301 )(Q 302 ), or -P(=S)(Q 301 )(Q 302 ).

[0185] <Formula H-1>

[0186] Ar 401 -(L 401 ) xd1 -(Ar 402 ) xd11 ,

[0187]

[0188] In Formulas H-1, 11, and 12,

[0189] L 401 may be:

[0190] a single bond; or

[0191] a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthene 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 benzo[9,10]phenanthrene group, a pyrene group, each of which is unsubstituted or substituted as follows: Group, tetracene group, picene group, perylene group, pentacene group, hexacene group, pentaphene group, rubicene group, coronene group, ovalene group, pyrrole group, isoindole group, indole group, furan group, thiophene group, benzofuran group, benzothiophene group, benzocarbazole group, dibenzocarbazole group, dibenzofuran group, dibenzothiophene group, dibenzothiophene sulfone group, carbazole group, dibenzosilole group, indeno[1,2,3-cd]carbazole group, indolo[3,2-b]carbazole group, benzofuro[3,2-b]carbazole group, benzothieno[3,2-b]carbazole group, or triindolo[1,2,3-cd]phenyl group: at least one deuterium, C1-C 10 alkyl group, C1-C 10 alkoxy group, phenyl group, naphthyl group, fluorenyl group, carbazolyl group, dibenzofuranyl group, dibenzothiophenyl group, benzo[9,10]phenanthryl group, biphenyl group, terphenyl group, quaterphenyl group, -Si(Q 401 )(Q 402 )(Q 403 ), or any combination thereof,

[0192] xd1 can be an integer from 1 to 10, where when xd1 is 2 or greater, two or more L 401 can be the same as or different from each other,

[0193] Ar 401 can be a group represented by Formula 11 or 12,

[0194] Ar 402 can be:

[0195] a group represented by Formula 11 and 12, phenyl group, naphthyl group, fluorenyl group, carbazolyl group, dibenzofuranyl group, dibenzothiophenyl group, biphenyl group, terphenyl group, or benzo[9,10]phenanthryl group; or

[0196] phenyl group, naphthyl group, fluorenyl group, carbazolyl group, dibenzofuranyl group, dibenzothiophenyl group, biphenyl group, terphenyl group, or benzo[9,10]phenanthryl group, each of which is substituted with: at least one deuterium, hydroxyl group, amino group, amidino group, hydrazino group, hydrazone group, carboxylic acid group or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, C1-C 20 alkyl group, C1-C 20 alkoxy group, phenyl group, naphthyl group, fluorenyl group, carbazolyl group, dibenzofuranyl group, dibenzothiophenyl group, biphenyl group, terphenyl group, benzo[9,10]phenanthryl group, or any combination thereof,

[0197] xd11 can be an integer from 1 to 10, where when xd11 is 2 or greater, two or more Ar 402 can be the same as or different from each other,

[0198] CY 401 and CY 402may 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,

[0199] A 21 may be a single bond, O, S, N(R 51 ), C(R 51 )(R 52 ), or Si(R 51 )(R 52 ),

[0200] A 22 may be a single bond, O, S, N(R 53 ), C(R 53 )(R 54 ), or Si(R 53 )(R 54 ),

[0201] At least one of A in Formula 12 21 and A 22 is not a single bond,

[0202] R 51 -R 54 , R 60 and R 70 may each independently be:

[0203] hydrogen, deuterium, a hydroxyl group, an amino group, an amidino group, a hydrazino group, a hydrazono group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1-C 20 alkyl group, or a C1-C 20 alkoxy group;

[0204] A C1-C 20 alkyl group or a C1-C 20 alkoxy group each substituted with: at least one deuterium, a hydroxyl group, an amino group, an amidino group, a hydrazino group, a hydrazono group, a carboxyl 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 fluorene group, a carbazole group, a dibenzofuran group, or a dibenzothiophene group;

[0205] A cyclic group that does not contain a π-deficient nitrogen (e.g., a phenyl group, a naphthyl group, a fluorene group, a carbazole group, a dibenzofuran group, a dibenzothiophene group, a biphenyl group, a terphenyl group, and a benzo[9,10]phenanthryl group);

[0206] A cyclic group without a π-deficient nitrogen atom (e.g., phenyl, naphthyl, fluorenyl, carbazolyl, dibenzofuranyl, dibenzothiophenyl, biphenyl, terphenyl, and benzo[9,10]phenanthryl) substituted with the following: at least one deuterium, hydroxyl, amino, amidino, hydrazino, hydrazono, carboxyl or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, naphthyl, fluorenyl, carbazolyl, dibenzofuranyl, dibenzothiophenyl, biphenyl, or any combination thereof; or

[0207] -Si(Q 404 )(Q 405 )(Q 406 ),

[0208] e1 and e2 can each independently be an integer from 0 to 10,

[0209] Q 401 -Q 406 can each independently be hydrogen, deuterium, hydroxyl, amino, amidino, hydrazino, hydrazono, carboxyl or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, phenyl, naphthyl, fluorenyl, carbazolyl, dibenzofuranyl, dibenzothiophenyl, biphenyl, terphenyl, or benzo[9,10]phenanthryl, and

[0210] * represents the binding site to the adjacent atom.

[0211] In one or more embodiments, Ar in formula E-1 301 and L 301 can each independently be a benzene group, naphthalene group, fluorene group, spiro-bifluorene group, benzo[b]fluorene group, dibenzo[b,d]fluorene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, benzo[9,10]phenanthrene group, pyrene group, group, tetracene group, picene group, perylene group, pentaphene group, indeno[1,2,3-cd]anthracene group, dibenzofuranyl group, dibenzothiophenyl group, imidazole group, pyrazole group, thiazole group, isothiazole group, azole group, iso azole group, pyridine group, pyrazine group, pyridazine group, pyrimidine group, indazole group, purine group, quinoline group, isoquinoline group, benzoquinoline group, phthalazine group, naphthyridine group, quinoxaline group, quinazoline group, cinnoline group, phenanthridine group, acridine group, phenanthroline group, phenazine group, benzimidazole group, isobenzothiazole group, benzo azole group, isobenz azole group, triazole group, tetrazole group, A 1,2,3 - triazole group, a 1,3,5 - triazine group, a 1,3,4 - thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group: at least one deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1 - C 20 alkyl, C1 - C 20 alkoxy, phenyl, biphenyl, terphenyl, naphthyl, phenyl containing cyano, biphenyl containing cyano, terphenyl containing cyano, naphthyl containing cyano, pyridyl, phenylpyridyl, diphenylpyridyl, biphenylpyridyl, bis(biphenyl)pyridyl, pyrazinyl, phenylpyrazinyl, diphenylpyrazinyl, biphenylpyrazinyl, bis(biphenyl)pyrazinyl, pyridazinyl, phenylpyridazinyl, diphenylpyridazinyl, biphenylpyridazinyl, bis(biphenyl)pyridazinyl, pyrimidinyl, phenylpyrimidinyl, diphenylpyrimidinyl, biphenylpyrimidinyl, bis(biphenyl)pyrimidinyl, 1,3,5 - triazinyl, phenyl - 1,3,5 - triazinyl, diphenyl - 1,3,5 - triazinyl, biphenyl - 1,3,5 - triazinyl, bis(biphenyl) - 1,3,5 - triazinyl, -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,

[0212] At least one of the L 301 with the number xb1 can each independently be an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, azole group, iso azole group, pyridyl, pyrazinyl, pyridazinyl, pyrimidinyl, indazolyl, purinyl, quinolinyl, isoquinolinyl, benzoquinolinyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, phenanthridinyl, acridinyl, phenanthrolinyl, phenazinyl, benzimidazolyl, isobenzothiazolyl, benzo azole group, isobenzo azole group, 1,2,3 - triazole group, 1,2,4 - triazole group, 1,3,4 - thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group: at least one deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1 - C alkyl, C1 - C 20 alkyl, C1 - C 20Alkoxy, phenyl, biphenyl, terphenyl, naphthyl, cyano-containing phenyl, cyano-containing biphenyl, cyano-containing terphenyl, cyano-containing naphthyl, pyridyl, phenylpyridyl, diphenylpyridyl, biphenylpyridyl, bis(biphenyl)pyridyl, pyrazinyl, phenylpyrazinyl, diphenylpyrazinyl, biphenylpyrazinyl, bis(biphenyl)pyrazinyl, pyridazinyl, phenylpyridazinyl, diphenylpyridazinyl, biphenylpyridazinyl, bis(biphenyl)pyridazinyl, pyrimidinyl, phenylpyrimidinyl, diphenylpyrimidinyl, biphenylpyrimidinyl, bis(biphenyl)pyrimidinyl, triazinyl, phenyltriazinyl, diphenyltriazinyl, biphenyltriazinyl, bis(biphenyl)triazinyl, -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,

[0213] R 301 can be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, cyano-containing phenyl, cyano-containing biphenyl, cyano-containing terphenyl, cyano-containing quaterphenyl, cyano-containing naphthyl, pyridyl, phenylpyridyl, diphenylpyridyl, biphenylpyridyl, bis(biphenyl)pyridyl, pyrazinyl, phenylpyrazinyl, diphenylpyrazinyl, biphenylpyrazinyl, bis(biphenyl)pyrazinyl, pyridazinyl, phenylpyridazinyl, diphenylpyridazinyl, biphenylpyridazinyl, bis(biphenyl)pyridazinyl, pyrimidinyl, phenylpyrimidinyl, diphenylpyrimidinyl, biphenylpyrimidinyl, bis(biphenyl)pyrimidinyl, triazinyl, phenyltriazinyl, diphenyltriazinyl, biphenyltriazinyl, bis(biphenyl)triazinyl, -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

[0214] Q 31 -Q 33 can each independently be a C1-C 10 alkyl group, a C1-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.

[0215] In one or more embodiments,

[0216] Ar 301 can 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 benzo[9,10]phenanthrene group, a pyrene group, group, a tetracene 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 C1-C 20 alkyl group, a C1-C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a phenyl group containing a cyano group, a biphenyl group containing a cyano group, a terphenyl group containing a cyano group, a naphthyl group containing a cyano group, a pyridyl group, a phenylpyridyl group, a diphenylpyridyl group, a biphenylpyridyl group, a bis(biphenyl)pyridyl group, a pyrazinyl group, a phenylpyrazinyl group, a diphenylpyrazinyl group, a biphenylpyrazinyl group, a bis(biphenyl)pyrazinyl group, a pyridazinyl group, a phenylpyridazinyl group, a diphenylpyridazinyl group, a biphenylpyridazinyl group, a bis(biphenyl)pyridazinyl group, a pyrimidinyl group, a phenylpyrimidinyl group, a diphenylpyrimidinyl group, a biphenylpyrimidinyl group, a bis(biphenyl)pyrimidinyl group, a triazinyl group, a phenyltriazinyl group, a diphenyltriazinyl group, a biphenyltriazinyl group, a bis(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

[0217] a group represented by one of Formulas 5-1 to 5-3 and 6-1 to 6-33, and

[0218] L 301 can be a group represented by Formulas 5-1 to 5-3 and 6-1 to 6-33:

[0219]

[0220]

[0221] In Formulas 5-1 to 5-3 and 6-1 to 6-33,

[0222] Z1 can be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, naphthyl, phenyl containing cyano, biphenyl containing cyano, terphenyl containing cyano, naphthyl containing cyano, pyridyl, phenylpyridyl, diphenylpyridyl, biphenylpyridyl, bis(biphenyl)pyridyl, pyrazinyl, phenylpyrazinyl, diphenylpyrazinyl, biphenylpyrazinyl, bis(biphenyl)pyrazinyl, pyridazinyl, phenylpyridazinyl, diphenylpyridazinyl, biphenylpyridazinyl, bis(biphenyl)pyridazinyl, pyrimidinyl, phenylpyrimidinyl, diphenylpyrimidinyl, biphenylpyrimidinyl, bis(biphenyl)pyrimidinyl, triazinyl, phenyltriazinyl, diphenyltriazinyl, biphenyltriazinyl, bis(biphenyl)triazinyl, -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 ),

[0223] d4 can be 0, 1, 2, 3, or 4,

[0224] d3 can be 0, 1, 2, or 3,

[0225] d2 can be 0, 1, or 2, and

[0226] * and *' each represent a binding site to an adjacent atom.

[0227] Q 31 -Q 33 is the same as described above.

[0228] In one or more embodiments, L 301 can be a group represented by Formulas 5-2, 5-3, and 6-8 to 6-33.

[0229] In one or more embodiments, R301 may be a cyano group or a group represented by Formulae 7-1 to 7-18, and Ar in the amount of xd11 402 At least one of may be a group represented by Formulae 7-1 to 7-18 below, but embodiments of the present disclosure are not limited thereto:

[0230]

[0231]

[0232] In Formulae 7-1 to 7-18,

[0233] xb41 to xb44 may each independently be 0, 1, or 2, where xb41 in Formula 7-10 is not 0, xb41 + xb42 in Formulae 7-11 to 7-13 is not 0, xb41 + xb42 + xb43 in Formulae 7-14 to 7-16 is not 0, xb41 + xb42 + xb43 + xb44 in Formulae 7-17 and 7-18 is not 0, and * represents a binding site to an adjacent atom.

[0234] In Formula E-1, two or more Ar 301 may be the same as or different from each other, and two or more L 301 may be the same as or different from each other. In Formula H-1, two or more L 401 may be the same as or different from each other, and two or more Ar 402 may be the same as or different from each other.

[0235] In one or more embodiments, the electron transport host may include i) at least one of a cyano group, a pyrimidine group, a pyrazine group, or a triazine group, and ii) a benzo[9,10]phenanthrene group, and the hole transport host may include a carbazole group.

[0236] In one or more embodiments, the electron transport host may include at least one cyano group.

[0237] The electron transport host may be, for example, a compound belonging to <Group HE1> to <Group HE7>, but embodiments of the present disclosure are not limited thereto:

[0238] <Group HE1>

[0239]

[0240]

[0241]

[0242]

[0243]

[0244]

[0245]

[0246]

[0247]

[0248]

[0249]

[0250]

[0251]

[0252]

[0253]

[0254]

[0255]

[0256]

[0257]

[0258]

[0259]

[0260]

[0261]

[0262] <Group HE2>

[0263]

[0264]

[0265]

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273]

[0274]

[0275]

[0276]

[0277]

[0278]

[0279]

[0280]

[0281]

[0282]

[0283]

[0284]

[0285]

[0286]

[0287]

[0288]

[0289]

[0290]

[0291]

[0292]

[0293]

[0294]

[0295]

[0296]

[0297] <Group HE3>

[0298]

[0299]

[0300]

[0301]

[0302]

[0303]

[0304]

[0305]

[0306]

[0307]

[0308]

[0309]

[0310]

[0311]

[0312]

[0313]

[0314]

[0315]

[0316]

[0317]

[0318]

[0319] <Group HE4>

[0320]

[0321]

[0322]

[0323]

[0324]

[0325]

[0326]

[0327] <Group HE5>

[0328]

[0329]

[0330]

[0331]

[0332]

[0333]

[0334] <Group HE6>

[0335]

[0336]

[0337]

[0338]

[0339]

[0340]

[0341]

[0342]

[0343]

[0344] <Group HE7>

[0345]

[0346]

[0347]

[0348]

[0349]

[0350]

[0351]

[0352] In one or more embodiments, the electron transport host may include DPEPO:

[0353]

[0354] In one or more embodiments, the hole transport host may be one of compounds H-H1 to H-H103, but embodiments of the present disclosure are not limited thereto:

[0355]

[0356]

[0357]

[0358]

[0359]

[0360] In one or more embodiments, the amphoteric host may be a compound belonging to <Group HEH1>, but embodiments of the present disclosure are not limited thereto:

[0361] <Group HEH1>

[0362]

[0363]

[0364]

[0365]

[0366]

[0367]

[0368]

[0369]

[0370]

[0371]

[0372]

[0373]

[0374]

[0375]

[0376] Among Compounds 1 to 432,

[0377] Ph represents a phenyl group.

[0378] In one or more embodiments, the hole transport host may include o-CBP as shown below:

[0379]

[0380] When the host is a mixture of an electron transport host and a hole transport host, the weight ratio of the electron transport host to the hole transport host may be from 1:9 to 9:1, such as from 2:8 to 8:2, and in one or more embodiments may be from 4:6 to 6:4, and in one or more embodiments may be 5:5. When the weight ratio of the electron transport host to the hole transport host is within the above range, a balance of hole and electron transport into the emission layer 15 can be achieved.

[0381] The dopant in the emission layer 15

[0382] Since the dopant emits fluorescence, the organic light-emitting device according to the present disclosure is significantly different from an organic light-emitting device including a compound that emits phosphorescence.

[0383] The maximum emission wavelength of the emission spectrum of the dopant may be 400 nm or greater and 550 nm or less. For example, the maximum emission wavelength of the emission spectrum of the dopant may be 400 nm or greater and 495 nm or less, or 450 nm or greater and 495 nm or less. However, the embodiments of the present disclosure are not limited thereto. That is, the dopant may emit blue light. As used herein, the term "maximum emission wavelength" refers to the wavelength of the maximum emission intensity and may also be referred to as the "peak emission wavelength".

[0384] In one or more embodiments, the dopant may not include a metal atom.

[0385] In one or more embodiments, the dopant may be a fused polycyclic compound, a styryl-based compound, or any combination thereof.

[0386] For example, the dopant may include a core containing naphthalene, a core containing fluorene, a core containing spiro-difluorene, a core containing benzofluorene, a core containing dibenzofluorene, a core containing phenanthrene, a core containing anthracene, a core containing fluoranthene, a core containing benzo[9,10]phenanthrene, a core containing pyrene, a core containing , a core containing tetracene, a core containing picene, a core containing perylene, a core containing pentaphene, a core containing indenoanthracene, a core containing bianthracene, and cores represented by Formulas 501-1 to 501-18, but embodiments of the present disclosure are not limited thereto:

[0387]

[0388]

[0389] In one or more embodiments, the dopant may be a styrylamine-based compound, a styrylcarbazole-based compound, or any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0390] In one or more embodiments, the dopant may be a compound represented by Formula 501:

[0391] <Formula 501>

[0392]

[0393] In Formula 501,

[0394] Ar 501 may be:

[0395] a naphthalene group, a fluorene group, a spiro-difluorene group, a benzofluorene group, a dibenzofluorene group, a phenanthrene group, an anthracene group, a fluoranthene group, a benzo[9,10]phenanthrene group, a pyrene group, , a tetracene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a bianthracene group, or a group represented by Formulas 501-1 to 501-18; or

[0396] a naphthalene group, a fluorene group, a spiro-difluorene group, a benzofluorene group, a dibenzofluorene group, a phenanthrene group, an anthracene group, a fluoranthene group, a benzo[9,10]phenanthrene group, a pyrene group, , a tetracene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a bianthracene group, or a group represented by Formulas 501-1 to 501-18, each substituted with: at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazino group, a hydrazono 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-C 60 alkyl group, a C2-C 60 alkenyl group, a C2-C60 Alkynyl, C1-C 60 Alkoxy, C3-C 10 Cycloalkyl, C2-C 10 Heterocycloalkyl, C3-C 10 Cycloalkenyl, C2-C 10 Heterocycloalkenyl, C6-C 60 Aryl, C6-C 60 Aryloxy, C6-C 60 Arylthio, C1-C 60 Heteroaryl, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, -Si(Q 501 )(Q 502 )(Q 503 (wherein Q 501 -Q 503 can each independently be hydrogen, C1-C 60 alkyl, C1-C 60 alkoxy, C6-C 60 aryl, C1-C 60 heteroaryl, monovalent non-aromatic fused polycyclic group, or monovalent non-aromatic fused heteropolycyclic group), or any combination thereof,

[0397] L 501 -L 503 can each independently be a substituted or unsubstituted C3-C 10 subcycloalkyl, substituted or unsubstituted C1-C 10 subheterocycloalkyl, substituted or unsubstituted C3-C 10 subcycloalkenyl, substituted or unsubstituted C1-C 10 subheterocycloalkenyl, substituted or unsubstituted C6-C 60 subaryl, substituted or unsubstituted C1-C 60 subheteroaryl, substituted or unsubstituted divalent non-aromatic fused polycyclic group, or substituted or unsubstituted divalent non-aromatic fused heteropolycyclic group,

[0398] R 501 and R 502 can each independently be:

[0399] phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro-bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, pyrenyl, group, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, carbazolyl group, triazinyl, dibenzofuranyl, or dibenzothiophenyl; or

[0400] phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro-bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, pyrenyl, each substituted as follows, a group, a pyridyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, a triazinyl group, a dibenzofuranyl group, or a dibenzothiophenyl group: at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazino group, a hydrazono group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, C1-C 20 alkyl group, C1-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 phenanthryl group, an anthryl group, a pyrenyl group, a group, a pyridyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a carbazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, or any combination thereof,

[0401] xd1-xd3 can each independently be 0, 1, 2 or 3, and

[0402] xd4 can be 0, 1, 2, 3, 4, 5 or 6.

[0403] For example, in Formula 501,

[0404] Ar 501 can be:

[0405] a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenanthrene group, an anthracene group, a fluoranthene group, a benzo[9,10]phenanthrene group, a pyrene group, a group, a tetracene group, a picene group, a perylene group, a pentaphene group, an indenopyrene group, a bianthene group, or a group represented by Formulae 501-1 to 501-18; or

[0406] a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenanthrene group, an anthracene group, a fluoranthene group, a benzo[9,10]phenanthrene group, a pyrene group, a group, a tetracene group, a picene group, a perylene group, a pentaphene group, an indenopyrene group, a bianthene group, or a group represented by Formulae 501-1 to 501-18, each substituted with: at least one deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazino group, a hydrazono group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, C1-C 20 alkyl group, C1-C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorene group, a dibenzofuranyl group, a dibenzothiophenyl group, a carbazolyl group, a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, -Si(Q 501 )(Q 502 )(Q 503 )(where Q501 -Q 503 may each independently be hydrogen, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, or naphthyl), or any combination thereof,

[0407] xd1 - xd3 may each independently be 0, 1, or 2, and

[0408] xd4 may be 0, 1, 2, or 3, but the embodiments of the present disclosure are not limited thereto.

[0409] In one or more embodiments, the dopant may include a compound represented by one of Formulas 502-1 to 502-5:

[0410] <Formula 502-1>

[0411]

[0412] <Formula 502-2>

[0413]

[0414] <Formula 502-3>

[0415]

[0416] <Formula 502-4>

[0417]

[0418] <Formula 502-5>

[0419]

[0420] In Formulas 502-1 to 502-5,

[0421] X 51 may be N or C-[(L 501 ) xd1 -R 501 , X 52 may be N or C-[(L 502 ) xd2 -R 502 , X 53 may be N or C-[(L 503 ) xd3 -R 503 , X 54 may be N or C-[(L 504 ) xd4 -R 504 , X 55 may be N or C-[(L505 ) xd5 -R 505 , X 56 can be N or C-[(L 506 ) xd6 -R 506 , X 57 can be N or C-[(L 507 ) xd7 -R 507 , and X 58 can be N or C-[(L 508 ) xd8 -R 508 ,

[0422] L 501 -L 508 can each be understood by referring to the description provided for L in Formula 501 501 .

[0423] xd1 - xd8 can each be understood by referring to the description provided for xd1 in Formula 501

[0424] R 501 -R 508 can each independently be:

[0425] hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxy or its salt, sulfo or its salt, phospho or its salt, C1-C 20 alkyl, or C1-C 20 alkoxy,

[0426] phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro - bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, pyrenyl, yl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, carbazolyl, triazinyl, dibenzofuranyl, or dibenzothiophenyl; or

[0427] phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro - bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, pyrenyl, yl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, carbazolyl, triazinyl, dibenzofuranyl, or dibenzothiophenyl each substituted with: at least one deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxy or its salt, sulfo or its salt, phospho or its salt, C1-C 20 alkyl, C1-C 20Alkoxy, phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro - bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, pyrenyl, group, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, carbazolyl, triazinyl, dibenzofuranyl, dibenzothiophenyl, or any combination thereof,

[0428] xd11 and xd12 can each independently be an integer from 0 - 5,

[0429] R 501 -R 504 The two substituents of can optionally be connected to form a saturated or unsaturated ring, and

[0430] R 505 -R 508 The two substituents of can optionally be connected to form a saturated or unsaturated ring.

[0431] In one or more embodiments, the dopant can include a compound represented by Formula 503:

[0432] <Formula 503>

[0433]

[0434] In Formula 503,

[0435] X 501 can be N, B, P(=)(R 504 ), or P(=S)(R 504 ),

[0436] Y 501 -Y 503 can each independently be O, S, N(R 505 ), B(R 505 ), C(R 505 )(R 506 ), or Si(R 505 )(R 506 ),

[0437] k501 can be 0 or 1, where when k501 is 0, -(Y 501 ) k501 - does not exist,

[0438] A 501 -A 503 can each independently be a C5 - C 30 carbocyclic group or a C1 - C 30 heterocyclic group,

[0439] L 501 -L 503can be understood by referring to the description provided for L in Formula 501 501 provided,

[0440] xd1 - xd3 can be understood by referring to the description provided for xd1 in Formula 501,

[0441] R 501 -R 506 can each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxy or its salt, sulfo or its salt, phospho or its salt, substituted or unsubstituted C1-C 60 alkyl, substituted or unsubstituted C2-C 60 alkenyl, substituted or unsubstituted C2-C 60 alkynyl, substituted or unsubstituted C1-C 60 alkoxy, substituted or unsubstituted C3-C 10 cycloalkyl, substituted or unsubstituted C2-C 10 heterocycloalkyl, substituted or unsubstituted C3-C 10 cycloalkenyl, substituted or unsubstituted C2-C 10 heterocycloalkenyl, substituted or unsubstituted C6-C 60 aryl, substituted or unsubstituted C6-C 60 aryloxy, substituted or unsubstituted C6-C 60 arylsulfanyl, substituted or unsubstituted C1-C 60 heteroaryl, substituted or unsubstituted monovalent non-aromatic fused polycyclic group, substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group, -C(Q1)(Q2)(Q3), -Si(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), wherein R 501 -R 506 may optionally be linked to form a substituted or unsubstituted C5-C 30 carbocyclic group or a substituted or unsubstituted C1-C 30 heterocyclic group,

[0442] xd11 and xd12 can each independently be an integer from 0 - 5,

[0443] Q1 - Q3 can each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 60 alkyl, C2-C 60 alkenyl, C2-C 60Alkynyl, C1-C 60 Alkoxy, C3-C 10 Cycloalkyl, C2-C 10 Heterocycloalkyl, C3-C 10 Cycloalkenyl, C2-C 10 Heterocycloalkenyl, C6-C 60 Aryl, C6-C 60 Aryloxy, C6-C 60 Arylthio, C1-C 60 Heteroaryl, C1-C 60 Heteroaryloxy, C1-C 60 Heteroarylthio, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, biphenyl, or terphenyl.

[0444] The dopant may include, for example, at least one of compounds FD(1) to FD(16) and FD1 to FD18:

[0445]

[0446]

[0447]

[0448]

[0449] The first compound in the emission layer 15

[0450] In one or more embodiments, the first compound may be represented by Formula 101 or 102:

[0451]

[0452] In Formulas 101 and 102,

[0453] A 21 may be an acceptor group,

[0454] D 21 may be a donor group,

[0455] m21 may be 1, 2, or 3,

[0456] n21 may be 1, 2, or 3,

[0457] 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,

[0458] R 21 may be hydrogen, deuterium, -F, -Cl, -Br, -I, -SF5, hydroxyl, cyano, nitro, amidino, hydrazino, hydrazono, substituted or unsubstituted C1-C60 alkyl, substituted or unsubstituted C2-C 60 alkenyl, substituted or unsubstituted C2-C 60 alkynyl, substituted or unsubstituted C1-C 60 alkoxy, substituted or unsubstituted C3-C 10 cycloalkyl, substituted or unsubstituted C2-C 10 heterocycloalkyl, substituted or unsubstituted C3-C 10 cycloalkenyl, substituted or unsubstituted C2-C 10 heterocycloalkenyl, substituted or unsubstituted C6-C 60 aryl, substituted or unsubstituted C7-C 60 alkaryl, substituted or unsubstituted C6-C 60 aryloxy, substituted or unsubstituted C6-C 60 arylthio, substituted or unsubstituted C1-C 60 heteroaryl, substituted or unsubstituted C2-C 60 alkylheteroaryl, substituted or unsubstituted C1-C 60 heteroaryloxy, substituted or unsubstituted C1-C 60 heteroarylthio, substituted or unsubstituted monovalent non-aromatic fused polycyclic group, substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group, -Si(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), and multiple R 21 optionally linked to form a substituted or unsubstituted C5-C 30 carbocyclic group or a substituted or unsubstituted C1-C 30 heterocyclic group,

[0459] Q1-Q3 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 60 alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl, C1-C 60 alkoxy, C3-C 10 cycloalkyl, C2-C 10 heterocycloalkyl, C3-C 10 cycloalkenyl, C2-C 10 heterocycloalkenyl, C6-C 60 aryl, C7-C 60 alkaryl, C6-C 60 aryloxy, C6-C 60Arylthio group, C1-C 60 Heteroaryl group, C2-C 60 Alkyl heteroaryl group, C1-C 60 Heteroaryloxy group, C1-C 60 Heteroarylthio group, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, C1-C substituted with at least one deuterium, -F, cyano group, C1-C 60 alkyl group, C6-C 60 aryl group, or any combination thereof substituted C1-C 60 alkyl group, or C1-C substituted with at least one deuterium, -F, cyano group, C1-C 60 alkyl group, C6-C 60 aryl group, or any combination thereof substituted C6-C 60 aryl group.

[0460] For example, A in Formulas 101 and 102 21 may be a substituted or unsubstituted cyclic group without π-deficient nitrogen.

[0461] Specifically, the cyclic group without π-deficient nitrogen may be:

[0462] benzene group, heptalene group, indene group, naphthalene group, azulene group, indacene group, acenaphthene group, fluorene group, spiro-bifluorene group, benzo[b]fluorene group, dibenzo[b,d]fluorene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, benzo[9,10]phenanthrene group, pyrene group, group, tetracene group, picene group, perylene group, pentacene group, hexacene group, pentaphene group, rubicene group, coronene group, ovalene group, pyrrole group, isoindole group, indole group, furan group, thiophene group, benzofuran group, benzothiophene group, benzocarbazole group, dibenzocarbazole group, dibenzofuran group, dibenzothiophene group, dibenzothiophene sulfone group, carbazole group, dibenzosilole group, indeno[1,2,3-cd]carbazole group, indolo[1,2,3-cd]carbazole group, benzofuro[3,2-c]carbazole group, benzothieno[3,2-c]carbazole group, or triindolo[1,2,3-cd]benzene group; or

[0463] a fused ring in which two or more cyclic groups without π-deficient nitrogen are fused to each other, but the embodiments of the present disclosure are not limited thereto.

[0464] For example, D in Formulas 101 and 102 21 may be:

[0465] -F, cyano group, or a cyclic group containing π-deficient nitrogen;

[0466] each C1-C substituted with at least one -F, cyano group, or any combination thereof 60 alkyl group, cyclic group containing π-deficient nitrogen, or cyclic group without π-deficient nitrogen; or

[0467] substituted by at least one deuterium, C1-C 60 alkyl group, a cyclic group containing a nitrogen with a lack of π electrons, a cyclic group without a nitrogen with a lack of π electrons, or a cyclic group containing a nitrogen with a lack of π electrons substituted by any combination thereof.

[0468] Specifically, the cyclic group without a nitrogen with a lack of π electrons can be understood by referring to its description provided herein.

[0469] Specifically, the cyclic group containing a nitrogen with a lack of π electrons can be a cyclic group having at least one *-N=*' moiety, and examples thereof include an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, azole group, iso azole group, pyridine group, pyrazine group, pyridazine group, pyrimidine group, indazole group, purine group, quinoline group, isoquinoline group, benzoquinoline group, phthalazine group, naphthyridine group, quinoxaline group, quinazoline group, cinnoline group, phenanthridine group, acridine group, phenanthroline group, phenazine group, benzimidazole group, isobenzothiazole group, benzo azole group, isobenz azole group, triazole group, tetrazole group, diazole group, triazine group, thiadiazole group, imidazopyridine group, imidazopyrimidine group, azacarbazole group, and benzimidazolobenzimidazole; and fused rings in which two or more cyclic groups containing a nitrogen with a lack of π electrons are fused to each other.

[0470] In one or more embodiments, the first compound can be a compound belonging to Groups VII to XII, but the embodiments of the present disclosure are not limited thereto:

[0471] <Group VII>

[0472]

[0473]

[0474]

[0475]

[0476]

[0477] <Group VIII>

[0478]

[0479]

[0480] <Group IX>

[0481]

[0482]

[0483]

[0484]

[0485]

[0486]

[0487]

[0488]

[0489]

[0490]

[0491]

[0492]

[0493]

[0494]

[0495]

[0496]

[0497]

[0498]

[0499]

[0500]

[0501]

[0502]

[0503]

[0504]

[0505]

[0506]

[0507]

[0508]

[0509]

[0510]

[0511]

[0512]

[0513]

[0514] <Group X>

[0515]

[0516]

[0517]

[0518]

[0519]

[0520]

[0521]

[0522]

[0523]

[0524]

[0525]

[0526]

[0527]

[0528]

[0529]

[0530]

[0531]

[0532]

[0533]

[0534]

[0535]

[0536]

[0537]

[0538]

[0539]

[0540]

[0541]

[0542]

[0543]

[0544]

[0545]

[0546]

[0547]

[0548]

[0549]

[0550]

[0551]

[0552]

[0553]

[0554]

[0555]

[0556]

[0557]

[0558]

[0559]

[0560]

[0561]

[0562]

[0563]

[0564]

[0565]

[0566] <Group XI>

[0567]

[0568]

[0569] <Group XII>

[0570]

[0571] Hole transport region 12

[0572] In the organic light-emitting device 10, the hole transport region 12 may be disposed between the first electrode 11 and the emission layer 15.

[0573] The hole transport region 12 may have a single-layer structure or a multi-layer structure.

[0574] 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 / intermediate layer structure, a hole injection layer / hole transport layer / intermediate layer structure, a hole transport layer / electron blocking layer structure, or a hole injection layer / hole transport layer / electron blocking layer structure, but the embodiments of the present disclosure are not limited thereto.

[0575] The hole transport region 12 may include any compound having hole transport properties.

[0576] For example, the hole transport region 12 may include amine-based compounds.

[0577] In one or more embodiments, the hole transport region 12 may include at least one compound represented by Formulas 201 to 205, but the embodiments of the present disclosure are not limited thereto:

[0578] <Formula 201>

[0579]

[0580] <Formula 202>

[0581]

[0582] <Formula 203>

[0583]

[0584] <Formula 204>

[0585]

[0586] <Formula 205>

[0587]

[0588] In Formulas 201 to 205,

[0589] L 201 -L 209 may each independently be *-O-*', *-S-*', a substituted or unsubstituted C5-C 60 carbocyclic group, or a substituted or unsubstituted C1-C 60 heterocyclic group,

[0590] xa1-xa9 may each independently be an integer from 0 to 5, and

[0591] R 201 -R 206 may each independently be a substituted or unsubstituted C3-C 10 cycloalkyl, a substituted or unsubstituted C2-C 10 heterocycloalkyl, a substituted or unsubstituted C3-C 10 cycloalkenyl, a substituted or unsubstituted C2-C 10 heterocycloalkenyl, a substituted or unsubstituted C6-C 60 aryl, a substituted or unsubstituted C6-C 60 aryloxy, a substituted or unsubstituted C6-C 60 arylthio, a substituted or unsubstituted C1-C 60 heteroaryl, a substituted or unsubstituted monovalent non-aromatic fused polycyclic group, or a substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group, wherein two adjacent groups among R 201 -R 206 may optionally be linked to each other via a single bond, dimethyl-methylene, or diphenyl-methylene.

[0592] For example, L 201 -L 209may each independently be a phenyl group, heptalene group, indene group, naphthalene group, group, indacene group, acenaphthene group, fluorene group, spiro - bifluorene group, benzofluorene group, dibenzofluorene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, benzo[9,10]phenanthrene group, pyrene group, group, tetracene group, picene group, perylene group, pentacene group, hexacene group, pentaphene group, rubicene group, coronene group, ovalene group, pyrrole group, isoindole group, indole group, furan group, thiophene group, benzofuran group, benzothiophene group, benzocarbazole group, dibenzocarbazole group, dibenzofuran group, dibenzothiophene group, dibenzothiophene sulfone group, carbazole group, dibenzosilole group, indacarbazole group, indolocarbazole group, benzofurocarbazole group, benzothiophenocarbazole group, or triindolobenzene group: at least one deuterium, C1 - C 10 alkyl, C1 - C 10 alkoxy, phenyl, naphthyl, fluorenyl, carbazolyl, dibenzofuranyl, dibenzothiophenyl, benzo[9,10]phenanthryl, biphenyl, terphenyl, quaterphenyl, -Si(Q 11 )(Q 12 )(Q 13 ), or any combination thereof,

[0593] xa1 - xa9 may each independently be 0, 1 or 2,

[0594] R 201 -R 206 may each independently be a phenyl group, biphenyl group, terphenyl group, cyclopentadienyl group, indene group, naphthalene group, azulene group, heptalene group, indacene group, acenaphthene group, fluorene group, spiro - bifluorene group, benzofluorene group, dibenzofluorene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, benzo[9,10]phenanthrene group, pyrene group, group, tetracenyl, picenyl, perylenyl, pentacenyl, hexacenyl, pentaphenyl, rubicenyl, coronenyl, ovalenyl, thiophenyl, furanyl, carbazolyl, indolyl, isoindolyl, benzofuranyl, benzothiophenyl, dibenzofuranyl, dibenzothiophenyl, benzocarbazolyl, dibenzocarbazolyl, dibenzosilolyl, pyridyl, indacarbazolyl, indolocarbazolyl, benzofurocarbazolyl, or benzothiophenocarbazolyl: at least one deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, amidino, hydrazino, hydrazone, C1 - C 20 alkyl, C1 - C 20 alkoxy, cyclopentyl, cyclohexyl, cycloheptyl, cyclopentenyl, cyclohexenyl, phenyl, biphenyl, terphenyl, substituted by C1 - C 10Alkyl-substituted phenyl, phenyl substituted with -F, cyclopentadienyl, indenyl, naphthyl, azulyl, heptaleneyl, indacenyl, acenaphthylenyl, fluorenyl, spiro-bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenalenyl, phenanthryl, anthracenyl, fluoranthenyl, benzo[9,10]phenanthryl, pyrenyl, yl, tetraphenyl, picenyl, perylenyl, pentaphenyl, hexaphenyl, rubicenyl, coronenyl, ovalenyl, thienyl, furyl, carbazolyl, indolyl, isoindolyl, benzofuranyl, benzothienyl, dibenzofuranyl, dibenzothienyl, benzocarbazolyl, dibenzocarbazolyl, dibenzosilolyl, pyridyl, -Si(Q 31 )(Q 32 )(Q 33 ), and -N(Q 31 )(Q 32 ), or any combination thereof, and

[0595] Q 11 -Q 13 and Q 31 -Q 33 may each independently be C1-C 10 alkyl, C1-C 10 alkoxy, phenyl, biphenyl, terphenyl, or naphthyl.

[0596] In one or more embodiments, the hole transport region 12 may include an amine-based compound containing carbazole.

[0597] In one or more embodiments, the hole transport region 12 may include an amine-based compound containing carbazole and an amine-based compound not containing carbazole.

[0598] The amine-based compound containing carbazole may be, for example, a compound represented by Formula 201 that further includes at least one of a dibenzofuran group, a dibenzothiophene group, a fluorene group, a spiro-bifluorene group, an indolocarbazole group, an indolocarbazole group, a benzofurancarbazole group, a benzothiophenecarbazole group, or any combination thereof in addition to the carbazole group.

[0599] The amine-based compound not containing carbazole may be, for example, a compound represented by Formula 201 that does not include a carbazole group but includes at least one of a dibenzofuran group, a dibenzothiophene group, a fluorene group, a spiro-bifluorene group, an indolocarbazole group, an indolocarbazole group, a benzofurancarbazole group, a benzothiophenecarbazole group, or any combination thereof.

[0600] In one or more embodiments, the hole transport region 12 may include at least one compound represented by Formulas 201 and 202.

[0601] In one or more embodiments, the hole transport region 12 may include at least one compound represented by Formulas 201-1, 202-1, and 201-2, but embodiments of the present disclosure are not limited thereto:

[0602] <Formula 201-1>

[0603]

[0604] <Formula 202-1>

[0605]

[0606] <Formula 201-2>

[0607]

[0608] In Formulas 201-1, 202-1, and 201-2, L 201 -L 203 、L 205 、xa1-xa3, xa5, R 201 and R 202 may each be understood by reference to their descriptions provided herein, and R 211 -R 213 may each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, phenyl substituted with C1-C 10 alkyl, phenyl substituted with -F, naphthyl, fluorenyl, spiro-bifluorenyl, dimethylfluorenyl, diphenylfluorenyl, benzo[9,10]phenanthryl, thienyl, furyl, carbazolyl, indolyl, isoindolyl, benzofuryl, benzothienyl, dibenzofuryl, dibenzothienyl, benzocarbazolyl, dibenzocarbazolyl, dibenzosilolyl, or pyridyl.

[0609] For example, the hole transport region 12 may include at least one compound of Compounds HT1 to HT39, but embodiments of the present disclosure are not limited thereto:

[0610]

[0611]

[0612]

[0613] 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 (e.g., at least one of the compounds represented by Formulas 201 to 205) and a p-dopant included in the matrix. The p-dopant may be doped in the hole transport region 12 uniformly or non-uniformly.

[0614] In one or more embodiments, the p-dopant may have a lowest unoccupied molecular orbital (LUMO) energy level of -3.5 eV or less.

[0615] The p-dopant may include at least one of a quinone derivative, a metal oxide, a compound containing a cyano group, or any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0616] For example, the p-dopant may include at least one of the following:

[0617] Quinone derivatives such as tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), F6-TCNNQ, or any combination thereof;

[0618] Metal oxides such as tungsten oxide and molybdenum oxide;

[0619] 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN); and

[0620] A compound represented by Formula 221,

[0621] but embodiments of the present disclosure are not limited thereto:

[0622]

[0623] <Formula 221>

[0624]

[0625] In Formula 221,

[0626] R 221 -R 223 may each independently be a substituted or unsubstituted C3-C 10 cycloalkyl, a substituted or unsubstituted C2-C 10 heterocycloalkyl, a substituted or unsubstituted C3-C 10 cycloalkenyl, a substituted or unsubstituted C2-C 10 heterocycloalkenyl, a substituted or unsubstituted C6-C 60 aryl, a substituted or unsubstituted C1-C 60A heteroaryl group, a substituted or unsubstituted monovalent non-aromatic fused polycyclic group, or a substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group, wherein R 221 -R 223 at least one of which may have at least one substituent such as a cyano group, -F, -Cl, -Br, -I, a C1-C 20 alkyl group substituted with -F, a C1-C 20 alkyl group substituted with -Cl, a C1-C 20 alkyl group substituted with -Br, a C1-C 20 alkyl group substituted with -I, or any combination thereof.

[0627] The thickness of the hole transport region 12 can be in the range of about to about For example, about to about and the thickness of the emission layer 15 can be in the range of about to about For example, about to about When the thicknesses of the hole transport region 12 and the emission layer 15 are within the above ranges, satisfactory hole transport characteristics and / or emission characteristics can be obtained without a significant increase in the driving voltage.

[0628] The electron transport region 17

[0629] In the organic light-emitting device 10, the electron transport region 17 can be disposed between the emission layer 15 and the second electrode 19.

[0630] The electron transport region 17 can have a single-layer structure or a multi-layer structure.

[0631] For example, the electron transport region 17 can have an electron transport layer structure, an electron transport layer / electron injection layer structure, a buffer layer / electron transport layer structure, a 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 the embodiments of the present disclosure are not limited thereto. The electron transport region 17 can further include an electron control layer.

[0632] The electron transport region 17 can include known electron transport materials.

[0633] The electron transport region 17 (for example, the buffer layer, hole blocking layer, electron control layer, or electron transport layer in the electron transport region 17) can include at least one metal-free compound including at least one cyclic group containing nitrogen with a lack of π electrons. The cyclic group containing nitrogen with a lack of π electrons can be understood by referring to its description provided herein.

[0634] For example, the electron transport region 17 may include a compound represented by Formula 601:

[0635] <Formula 601>

[0636] [Ar 601 xe11 -[(L 601 ) xe1 -R 601 xe21 。

[0637] In Formula 601,

[0638] Ar 601 and L 601 may each independently be a substituted or unsubstituted C5-C 60 carbocyclic group or a substituted or unsubstituted C1-C 60 heterocyclic group,

[0639] xe11 may be 1, 2, or 3,

[0640] xe1 may be an integer from 0 - 5,

[0641] R 601 may be a substituted or unsubstituted C3-C 10 cycloalkyl, a substituted or unsubstituted C2-C 10 heterocycloalkyl, a substituted or unsubstituted C3-C 10 cycloalkenyl, a substituted or unsubstituted C2-C 10 heterocycloalkenyl, a substituted or unsubstituted C6-C 60 aryl, a substituted or unsubstituted C6-C 60 aryloxy, a substituted or unsubstituted C6-C 60 arylthio, a substituted or unsubstituted C1-C 60 heteroaryl, a substituted or unsubstituted monovalent non-aromatic fused polycyclic group, a substituted or unsubstituted monovalent non-aromatic fused 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 ),

[0642] Q 601 -Q 603 may each independently be a C1-C 10 alkyl, a C1-C 10 alkoxy, phenyl, biphenyl, terphenyl, or naphthyl, and

[0643] ​​xe21 can be an integer from 1 to 5.

[0644] In one or more embodiments, at least one of the number of Ar of xe11 601 and at least one of the number of R of xe21 601 may include a cyclic group containing nitrogen lacking π electrons.

[0645] In one or more embodiments, Ar in Formula 601 601 and L 601 may each independently be a phenyl group, naphthyl group, fluorene group, spiro-difluorene group, benzo[9,10]fluorene group, dibenzo[9,10]fluorene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, benzo[9,10]phenanthrene group, pyrene group, group, tetracene group, picene group, perylene group, pentacene group, indeno[1,2,3-cd]anthracene group, dibenzofuran group, dibenzothiophene group, carbazole group, imidazole group, pyrazole group, thiazole group, isothiazole group, oxazole group, iso oxazole group, pyridine group, pyrazine group, pyrimidine group, pyridazine group, indazole group, purine group, quinoline group, isoquinoline group, benzoquinoline group, phthalazine group, naphthyridine group, quinoxaline group, quinazoline group, cinnoline group, phenanthridine group, acridine group, phenanthroline group, phenazine group, benzimidazole group, isobenzothiazole group, benzo oxazole group, isobenzo oxazole group, triazole group, tetrazole group, diazole group, triazine group, thiadiazole group, imidazopyridine group, imidazopyrimidine group, or azacarbazole group: at least one deuterium, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, amidino group, hydrazino group, hydrazone group, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, naphthyl, -Si(Q 31 )(Q 32 )(Q 33 )、-S(=O)2(Q 31 )、-P(=O)(Q 31 )(Q 32 )、or any combination thereof, and

[0646] Q 31 -Q 33 may each independently be C1-C 10 alkyl, C1-C 10 alkoxy, phenyl, biphenyl, terphenyl, naphthyl, or any combination thereof.

[0647] In Formula 601, when xe11 is 2 or greater, two or more Ars 601 can be connected via a single bond.

[0648] In one or more embodiments, Ar in Formula 601 601 can be an anthracene group.

[0649] In one or more embodiments, the compound represented by Formula 601 can be represented by Formula 601-1:

[0650] <Formula 601-1>

[0651]

[0652] In Formula 601-1,

[0653] X 614 can be N or C(R 614 ), X 615 can be N or C(R 615 ), X 616 can be N or C(R 616 ), and at least one of X 614 -X 616 can be N,

[0654] L 611 -L 613 can each be understood by referring to the description provided for L 601 .

[0655] xe611-xe613 can each be understood by referring to the description provided for xe1.

[0656] R 611 -R 613 can each be understood by referring to the description provided for R 601 , and

[0657] R 614 -R 616 can each independently be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, or naphthyl.

[0658] In one or more embodiments, xe1 and xe611-xe613 in Formulas 601 and 601-1 can each independently be 0, 1, or 2.

[0659] In one or more embodiments, R 601 and R 611 -R613 Each may independently be:

[0660] Phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro-bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, fluoranthenyl, benzo[9,10]phenanthryl, pyrenyl, -yl, perylenyl, pentaphenylenyl, hexaphenylenyl, pentaphenyl, thienyl, furyl, carbazolyl, indolyl, isoindolyl, benzofuranyl, benzothienyl, dibenzofuranyl, dibenzothienyl, benzocarbazolyl, dibenzocarbazolyl, dibenzosilolyl, pyridyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, -azolyl, iso -azolyl, thiadiazolyl, -diazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, benzoquinolinyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, phenanthridinyl, acridinyl, phenanthrolinyl, phenazinyl, benzimidazolyl, isobenzothiazolyl, benzo -azolyl, isobenzo -azolyl, triazolyl, tetrazolyl, imidazopyridinyl, imidazopyrimidinyl, or aza-carbazolyl: deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 20 alkyl, C1-C 20 alkoxy, phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, spiro-bifluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, anthryl, fluoranthenyl, benzo[9,10]phenanthryl, pyrenyl, -yl, perylenyl, pentaphenylenyl, hexaphenylenyl, pentaphenyl, thienyl, furyl, carbazolyl, indolyl, isoindolyl, benzofuranyl, benzothienyl, dibenzofuranyl, dibenzothienyl, benzocarbazolyl, dibenzocarbazolyl, dibenzosilolyl, pyridyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, -azolyl, iso -azolyl, thiadiazolyl, -diazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, benzoquinolinyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, phenanthridinyl, acridinyl, phenanthrolinyl, phenazinyl, benzimidazolyl, isobenzothiazolyl, benzo -azolyl, isobenzo -azolyl, triazolyl, tetrazolyl, imidazopyridinyl, imidazopyrimidinyl, aza-carbazolyl; or any combination thereof, or

[0661] -S(=O)2(Q 601 ), or -P(=O)(Q 601 )(Q 602 ), and

[0662] Q 601 and Q 602 can each be understood by reference to their descriptions provided herein.

[0663] 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:

[0664]

[0665]

[0666]

[0667] In one or more embodiments, the electron transport region 17 may include at least one of the following compounds: 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ), NTAZ, or any combination thereof:

[0668]

[0669] The thickness of the buffer layer, hole blocking layer, or electron control layer may be from about to about For example, from about to about When the thicknesses of the buffer layer, hole blocking layer, and electron control layer are within these ranges, excellent electron blocking characteristics or electron control characteristics can be obtained without a significant increase in the driving voltage.

[0670] The thickness of the electron transport layer may be from about to about For example, from about to about When the thickness of the electron transport layer is within the ranges described above, the electron transport layer can have satisfactory electron transport characteristics without a significant increase in the driving voltage.

[0671] In addition to the materials described above, the electron transport region 17 (e.g., the electron transport layer in the electron transport region) may further include a metal-containing material.

[0672] The metal-containing material may include at least one alkali metal complex, alkaline earth metal complex, or any combination thereof. The alkali metal complex may include metal ions such as Li ions, Na ions, K ions, Rb ions, Cs ions, or any combination thereof, and the alkaline earth metal complex may include metal ions such as Be ions, Mg ions, Ca ions, Sr ions, Ba ions, or any combination thereof. The ligand coordinated to the metal ion of the alkali metal complex or alkaline earth metal complex may be hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyl oxazole, hydroxyphenylthiazole, hydroxydiphenyl diazole, hydroxydiphenylthiadiazole, hydroxyphenylpyridine, hydroxyphenylbenzimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthroline, cyclopentadiene, or any combination thereof, but the embodiments of the present disclosure are not limited thereto.

[0673] For example, the metal-containing material may include a Li complex. The Li complex may include, for example, the compound ET-D1 (lithium quinolate, LiQ) or ET-D2:

[0674]

[0675] The electron transport region 17 may include an electron injection layer that promotes the injection of electrons from the second electrode 19. The electron injection layer may be in direct contact with the second electrode 19.

[0676] The electron injection layer may have i) a single-layer structure including a single layer containing a single material, ii) a single-layer structure including a single layer containing a plurality of different materials, or iii) a multi-layer structure having a plurality of layers containing a plurality of different materials.

[0677] The electron injection layer may include an alkali metal, alkaline earth metal, rare earth metal, alkali metal compound, alkaline earth metal compound, rare earth metal compound, alkali metal complex, alkaline earth metal complex, rare earth metal complex, or any combination thereof.

[0678] The alkali metal may be Li, Na, K, Rb, Cs, or any combination thereof. In one or more embodiments, the alkali metal may be Li, Na, or Cs. In one or more embodiments, the alkali metal may be Li or Cs, but the embodiments of the present disclosure are not limited thereto.

[0679] The alkaline earth metal may be Mg, Ca, Sr, Ba, or any combination thereof.

[0680] The rare earth metal may be Sc, Y, Ce, Tb, Yb, Gd, or any combination thereof.

[0681] The alkali metal compounds, alkaline earth metal compounds, and rare earth metal compounds can be oxides, halides (e.g., fluorides, chlorides, bromides, or iodides), or any combination thereof of alkali metals, alkaline earth metals, and rare earth metals.

[0682] The alkali metal compounds can be alkali metal oxides such as Li2O, Cs2O, or K2O, or alkali metal halides such as LiF, NaF, CsF, KF, LiI, NaI, CsI, or KI. In one or more embodiments, the alkali metal compounds can be LiF, Li2O, NaF, LiI, NaI, CsI, or KI, but the embodiments of the present disclosure are not limited thereto.

[0683] The alkaline earth metal compounds can be alkaline earth metal oxides 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 one or more embodiments, the alkaline earth metal compounds can be BaO, SrO, or CaO, but the embodiments of the present disclosure are not limited thereto.

[0684] The rare earth metal compounds can be YbF3, ScF3, Sc2O3, Y2O3, Ce2O3, GdF3, or TbF3. In one or more embodiments, the rare earth metal compounds can be YbF3, ScF3, TbF3, YbI3, ScI3, or TbI3, but the embodiments of the present disclosure are not limited thereto.

[0685] The alkali metal complexes, alkaline earth metal complexes, and rare earth metal complexes can include the ions of alkali metals, alkaline earth metals, and rare earth metals as described above, and the ligands coordinated to the metal ions of the alkali metal complexes, alkaline earth metal complexes, or rare earth metal complexes can be hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyl azole, hydroxyphenylthiazole, hydroxydiphenyl diazole, hydroxydiphenylthiadiazole, hydroxyphenylpyridine, hydroxyphenylbenzimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthroline, or cyclopentadiene, but the embodiments of the present disclosure are not limited thereto.

[0686] 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 combination 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, the alkali metal, the alkaline earth metal, the rare earth metal, the alkali metal compound, the alkaline earth metal compound, the rare earth metal compound, the alkali metal complex, the alkaline earth metal complex, the rare earth metal complex, or any combination thereof may be uniformly or non-uniformly dispersed in a matrix including the organic material.

[0687] The thickness of the electron injection layer may be in the range of about to about For example, about to about . When the thickness of the electron injection layer is within these ranges, satisfactory electron injection characteristics can be obtained without a significant increase in the driving voltage.

[0688] The second electrode 19

[0689] The second electrode 19 may be disposed on the organic layer 10A having such a structure. The second electrode 19 may be a cathode serving as an electron injection electrode, and in this regard, the material for forming the second electrode 19 may be a metal, an alloy, a conductive compound, or any combination thereof that may have a relatively low work function.

[0690] The second electrode 19 may include at least one of lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), ITO, IZO, or any combination thereof, but the 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.

[0691] The second electrode 19 may have a single-layer structure or a multi-layer structure including two or more layers.

[0692] Above, an organic light-emitting device according to an exemplary embodiment has been described with respect to Figure 1 .

[0693] Figure 2 The description

[0694] Figure 2 is a schematic diagram of an organic light-emitting device 100 according to another embodiment.

[0695] Figure 2The organic light-emitting device 100 includes a first electrode 110, a second electrode 190 facing the first electrode 110, and first and second light-emitting units 151 and 152 disposed between the first electrode 110 and the second electrode 190. A charge generation layer 141 may be disposed between the first light-emitting unit 151 and the second light-emitting unit 152, where 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 charges and supplies the charges to adjacent light-emitting units, and may include known materials.

[0696] The first light-emitting unit 151 may include a first emission layer 151-EM, and the second light-emitting unit 152 may include a second emission layer 152-EM. The maximum emission wavelength of the light emitted from the first light-emitting unit 151 may be different from the maximum emission wavelength of the light emitted from the second light-emitting unit 152. For example, the mixed light of the light emitted from the first light-emitting unit 151 and the light emitted from the second light-emitting unit 152 may be white light, but embodiments of the present disclosure are not limited thereto.

[0697] A hole transport region 120 may be disposed between the first light-emitting unit 151 and the first electrode 110, and the second light-emitting unit 152 may include a first hole transport region 121 disposed on a side of the second light-emitting unit 152 facing the first electrode 110.

[0698] An electron transport region 170 may be disposed between the second light-emitting unit 152 and the second electrode 190, and the first light-emitting unit 151 may include a first electron transport region 171 disposed between the charge generation layer 141 and the first emission layer 151-EM.

[0699] The first emission layer 151-EM may include a host, a dopant, and a first compound, where the first compound may satisfy the above conditions 1 to 4.

[0700] The second emission layer 152-EM may include a host, a dopant, and a first compound, where the first compound may satisfy the above conditions 1 to 4.

[0701] In Figure 2 the first electrode 110 and the second electrode 190 may be understood respectively by referring to the descriptions provided regarding the first electrode 11 and the second electrode 19 in Figure 1 .

[0702] In Figure 2 the first emission layer 151-EM and the second emission layer 152-EM may be understood respectively by referring to the descriptions provided regarding the emission layer 15 in Figure 1 .

[0703] In Figure 2In, the hole transport region 120 and the first hole transport region 121 can each be understood by referring to the description provided regarding Figure 1 the hole transport region 12 therein.

[0704] In Figure 2 the electron transport region 170 and the first electron transport region 171 can each be understood by referring to the description provided regarding Figure 1 the electron transport region 17 therein.

[0705] Above, with reference to Figure 2 both the first light-emitting unit 151 and the second light-emitting unit 152 are described for an organic light-emitting device including an emission layer containing a host, a dopant, and a first compound. However, various modifications can be obtained as follows: for example, Figure 2 one of the first light-emitting unit 151 and the second light-emitting unit 152 in the organic light-emitting device of

[0706] Figure 3 can be replaced with any light-emitting unit known in the art, or the organic light-emitting device can include three or more light-emitting units.

[0707] Figure 3 is a schematic diagram of an organic light-emitting device 200 according to another exemplary embodiment.

[0708] 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 stacked between the first electrode 210 and the second electrode 290.

[0709] The maximum emission wavelength of the light emitted from the first emission layer 251 can be different from the maximum emission wavelength of the 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 can be white light, but the embodiments of the present disclosure are not limited thereto.

[0710] In one or more embodiments, a hole transport region 220 can be disposed between the first emission layer 251 and the first electrode 210, and an electron transport region 270 can be disposed between the second emission layer 252 and the second electrode 290.

[0711] The first emission layer 251 can include a host, a dopant, and a first compound, wherein the first compound can satisfy the above conditions 1 to 4.

[0712] The second emission layer 252 can include a host, a dopant, and a first compound, wherein the first compound can satisfy the above conditions 1 to 4.

[0713] In Figure 3In [reference], the first electrode 210, the hole transport region 220, and the second electrode 290 can each be understood by referring to the descriptions provided for the first electrode 11, the hole transport region 12, and the second electrode 19 in Figure 1 .

[0714] In Figure 3 , the first emission layer 251 and the second emission layer 252 can each be understood by referring to the description provided for the emission layer 15 in Figure 1 .

[0715] In Figure 3 , the electron transport region 270 can be understood by referring to the description provided for the electron transport region 17 in Figure 1 .

[0716] Above, with reference to Figure 3 , both the first emission layer 251 and the second emission layer 252 are described for an organic light-emitting device including an emission layer containing a host, a dopant, and a first compound. However, various variations can be obtained as follows: for example, Figure 3 either the first emission layer 251 or the second emission layer 252 in [reference] can be replaced with a known layer, the organic light-emitting device can include three or more emission layers, or the organic light-emitting device can further include an intermediate layer between adjacent emission layers.

[0717] Description of terms

[0718] As used herein, the term "C1-C 60 alkyl" refers to a straight-chain or branched aliphatic saturated hydrocarbon monovalent group having 1 to 60 carbon atoms, and examples thereof include methyl, ethyl, propyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, and hexyl. As used herein, the term "C1-C 60 alkylene" refers to a divalent group having the same structure as C1-C 60 alkyl.

[0719] As used herein, the term "C1-C 60 alkoxy" refers to a monovalent group represented by -OA 101 (where A 101 is C1-C 60 alkyl), and examples thereof include methoxy, ethoxy, and isopropoxy.

[0720] As used herein, the term "C2-C 60 alkenyl" refers to a hydrocarbon group having at least one carbon-carbon double bond at the middle or end of C2-C 60 alkyl, and examples thereof include vinyl, propenyl, and butenyl. As used herein, the term "C2-C 60"Vinylene" refers to a divalent group having the same structure as C2-C 60 alkenyl.

[0721] As used herein, the term "C2-C 60 alkynyl" refers to a hydrocarbon group having at least one carbon-carbon triple bond at the middle or end of C2-C 60 alkyl, and examples thereof include ethynyl and propynyl. As used herein, the term "C2-C 60 alkynylene" refers to a divalent group having the same structure as C2-C 60 alkynyl.

[0722] As used herein, the term "C3-C 10 cycloalkyl" refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and limiting examples thereof include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. As used herein, the term "C3-C 10 cycloalkylene" refers to a divalent group having the same structure as C3-C 10 cycloalkyl.

[0723] As used herein, the term "C2-C 10 heterocycloalkyl" refers to a monovalent saturated monocyclic group having at least one N, O, P, Si, B, Se, Ge, Te, S, or any combination thereof as a ring-forming atom and 2 to 10 carbon atoms, and non-limiting examples thereof include tetrahydrofuranyl and tetrahydrothienyl. As used herein, the term "C2-C 10 heterocycloalkylene" refers to a divalent group having the same structure as C2-C 10 heterocycloalkyl.

[0724] As used herein, the term "C3-C 10 cycloalkenyl" refers to a monovalent monocyclic group having 3 to 10 carbon atoms and at least one carbon-carbon double bond in its ring and not having aromaticity, and non-limiting examples thereof include cyclopentenyl, cyclohexenyl, and cycloheptenyl. As used herein, the term "C3-C 10 cycloalkenylene" refers to a divalent group having the same structure as C3-C 10 cycloalkenyl.

[0725] As used herein, the term "C2-C 10 heterocycloalkenyl" refers to a monovalent monocyclic group having at least one N, O, P, Si, B, Se, Ge, Te, S, or any combination thereof as a ring-forming atom, 2 to 10 carbon atoms, and at least one carbon-carbon double bond in its ring. C2-C 10Examples of heterocyclenyl include 2,3-dihydrofuranyl and 2,3-dihydrothienyl. As used herein, the term "C2-C 10 heterocyclenylene" refers to a divalent group having the same structure as C2-C 10 heterocyclenyl.

[0726] As used herein, the term "C6-C 60 aryl" refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and as used herein, the term "C6-C 60 arylene" refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Examples of C6-C 60 aryl include phenyl, naphthyl, anthryl, phenanthryl, pyrenyl, and -yl. When C6-C 60 aryl and C6-C 60 arylene each include two or more rings, the rings may be fused to each other.

[0727] As used herein, the term "C1-C 60 heteroaryl" refers to a monovalent group having a cyclic aromatic system having at least one N, O, P, Si, B, Se, Ge, Te, S, or any combination thereof as a ring-forming atom in addition to 1 to 60 carbon atoms. As used herein, the term "C1-C 60 heteroarylene" refers to a divalent group having a cyclic aromatic system having at least one N, O, P, Si, B, Se, Ge, Te, S, or any combination thereof as a ring-forming atom in addition to 1 to 60 carbon atoms. Examples of C1-C 60 heteroaryl include pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, and isoquinolinyl. When C6-C 60 heteroaryl and C6-C 60 heteroarylene each include two or more rings, the rings may be fused to each other.

[0728] As used herein, the term "C6-C 60 aryloxy" refers to -OA 102 (where A 102 is C6-C 60 aryl), and C6-C 60 arylthio as used herein refers to -SA 103 (where A 103 is C6-C 60 aryl).

[0729] As used herein, the term "monovalent non-aromatic fused polycyclic group" refers to a monovalent group that has two or more rings fused to each other, has only carbon atoms (e.g., the number of carbon atoms can range from 8 to 60) as ring-forming atoms, and does not have aromaticity in its entire molecular structure. Non-limiting examples of the monovalent non-aromatic fused polycyclic group include fluorenyl. As used herein, the term "divalent non-aromatic fused polycyclic group" refers to a divalent group having the same structure as the monovalent non-aromatic fused polycyclic group.

[0730] As used herein, the term "monovalent non-aromatic fused heteropolycyclic group" refers to a monovalent group that has two or more rings fused to each other, has at least one N, O, P, Si, B, Se, Ge, Te, S, or any combination thereof as ring-forming atoms in addition to carbon atoms (e.g., having 1 to 60 carbon atoms), and does not have aromaticity in its entire molecular structure. Non-limiting examples of the monovalent non-aromatic fused heteropolycyclic group include carbazolyl. As used herein, the term "divalent non-aromatic fused heteropolycyclic group" refers to a divalent group having the same structure as the monovalent non-aromatic fused heteropolycyclic group.

[0731] As used herein, the term "C5-C 30 carbocyclic group" refers to a saturated or unsaturated cyclic group having only 5 to 30 carbon atoms as ring-forming atoms. As used herein, the term "C5-C 30 carbocyclic group" refers to a monocyclic group or a polycyclic group, and depending on its chemical structure, refers to a monovalent, divalent, trivalent, tetravalent, pentavalent, or hexavalent group.

[0732] As used herein, the term "C1-C 30 heterocyclic group" refers to a saturated or unsaturated cyclic group having at least one heteroatom N, O, Si, P, B, Se, Ge, Te, S, or any combination thereof as ring-forming atoms in addition to 1 to 30 carbon atoms. As used herein, the term "C1-C 30 heterocyclic group" refers to a monocyclic group or a polycyclic group, and depending on its chemical structure, refers to a monovalent, divalent, trivalent, tetravalent, pentavalent, or hexavalent group.

[0733] In this specification, at least one substituent of a substituted group may be:

[0734] deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, hydroxy, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxylic acid or its salt, sulfonic acid or its salt, phosphoric acid or its salt, C1-C 60 alkyl, C2-C 60 alkenyl, C2-C60 alkynyl, or C1-C 60 alkoxy;

[0735] C1-C each substituted with the following 60 alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl, or C1-C 60 alkoxy: at least one deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, hydroxyl, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxyl or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, C3-C 10 cycloalkyl, C2-C 10 heterocycloalkyl, C3-C 10 cycloalkenyl, C2-C 10 heterocycloalkenyl, C6-C 60 aryl, C6-C 60 aryloxy, C6-C 60 arylthio, C1-C 60 heteroaryl, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused 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;

[0736] C3-C 10 cycloalkyl, C2-C 10 heterocycloalkyl, C3-C 10 cycloalkenyl, C2-C 10 heterocycloalkenyl, C6-C 60 aryl, C6-C 60 aryloxy, C6-C 60 arylthio, C1-C 60 heteroaryl, monovalent non-aromatic fused polycyclic group, or monovalent non-aromatic fused heteropolycyclic group;

[0737] C3-C each substituted with the following 10 cycloalkyl, C2-C 10 heterocycloalkyl, C3-C 10 cycloalkenyl, C2-C 10 heterocycloalkenyl, C6-C 60 aryl, C6-C 60 aryloxy, C6-C60 Arylthio, C1-C 60 Heteroaryl, monovalent non-aromatic fused polycyclic group, or monovalent non-aromatic fused heteropolycyclic group: at least one deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, hydroxyl, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxyl or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, C1-C 60 Alkyl, C2-C 60 Alkenyl, C2-C 60 Alkynyl, C1-C 60 Alkoxy, C3-C 10 Cycloalkyl, C2-C 10 Heterocycloalkyl, C3-C 10 Cycloalkenyl, C2-C 10 Heterocycloalkenyl, C6-C 60 Aryl, C6-C 60 Aryloxy, C6-C 60 Arylthio, C1-C 60 Heteroaryl, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, -N(Q 21 )(Q 22 )、-Si(Q 23 )(Q 24 )(Q 25 )、-B(Q 26 )(Q 27 )、-P(=O)(Q 28 )(Q 29 )、or any combination thereof; or

[0738] -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

[0739] Q1-Q9, Q 11 -Q 19 、Q 21 -Q 29 、and Q 31 -Q 39 can each independently be: hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, amino, amidino, hydrazino, hydrazono, carboxyl or its salt, sulfonic acid group or its salt, phosphoric acid group or its salt, C1-C 60Alkyl, C2-C 60 Alkenyl, C2-C 60 Alkynyl, C1-C 60 Alkoxy, C3-C 10 Cycloalkyl, C2-C 10 Heterocycloalkyl, C3-C 10 Cycloalkenyl, C2-C 10 Heterocycloalkenyl, C6-C 60 Aryl, substituted with at least one of C1-C 60 alkyl, C6-C 60 aryl, or any combination thereof, of C6-C 60 Aryl, C6-C 60 Aryloxy, C6-C 60 Arylthio, C1-C 60 Heteroaryl, a monovalent non-aromatic fused polycyclic group, or a monovalent non-aromatic fused heteropolycyclic group.

[0740] As used herein, the term "room temperature" refers to a temperature of about 25 °C.

[0741] As used herein, the terms "biphenyl, terphenyl, and quaterphenyl" refer to monovalent groups in which two, three, or four phenyl groups are connected to each other via single bonds, respectively.

[0742] As used herein, the terms "phenyl containing a cyano group", "biphenyl containing a cyano group", "terphenyl containing a cyano group", and "quaterphenyl containing a cyano group" refer to "phenyl", "biphenyl", "terphenyl", and "quaterphenyl", respectively, each of which is substituted with at least one cyano group. In "phenyl containing a cyano group", "biphenyl containing a cyano group", "terphenyl containing a cyano group", and "quaterphenyl containing a cyano group", the cyano group can be substituted at any position, and in addition to the cyano group, "phenyl containing a cyano group", "biphenyl containing a cyano group", "terphenyl containing a cyano group", and "quaterphenyl containing a cyano group" can further include other substituents. For example, both phenyl substituted with a cyano group and phenyl substituted with a cyano group and a methyl group belong to "phenyl containing a cyano group".

[0743] Hereinafter, the compounds and organic light-emitting devices according to the embodiments are described in detail with reference to the synthesis examples and examples. However, the organic light-emitting devices are not limited thereto. The phrase "using 'B' instead of 'A'" used in the description of the synthesis examples means that the molar equivalent of 'A' is the same as that of 'B'.

[0744] Examples

[0745] Evaluation Example 1: ΔE ST , ΔE ST2 and ΔE' TT Calculation

[0746] For compounds X, Y, and Z of the comparative examples and examples, calculate ΔE according to the method described above ST 、ΔE ST2 and ΔE' TT , and determine whether conditions 1 to 4 are satisfied. The results are shown in Table 1.

[0747] Table 1

[0748]

[0749]

[0750]

[0751] Evaluation of Example 2: Measurement of HOMO, LUMO, T1, S1, and ΔE ST Measurement

[0752] Measure HOMO, LUMO, T1, S1, and ΔE according to the method described in Table 2 ST , and the results are shown in Table 3.

[0753] Table 2

[0754]

[0755]

[0756] Table 3

[0757]

[0758] Referring to Table 3, confirm that compound X has a relatively small ΔE ST , while compounds Y and Z each have a relatively large ΔE ST .

[0759] Example 1

[0760] Cut the ITO glass substrate into a size of 50 mm × 50 mm × 0.5 mm, ultrasonically treat it with isopropyl alcohol and pure water for 15 minutes each, and then clean it by exposure to ultraviolet light and ozone for 30 minutes.

[0761] Then, deposit F6-TCNNQ on the ITO electrode (i.e., the anode) of the glass substrate to form a hole injection layer with a thickness of, and deposit HT1 on the hole injection layer to form a hole transport layer with a thickness of, thereby forming a hole transport region.

[0762] DPEPO (i.e., the first host) and Compound Z (i.e., the dopant) (wherein the amount of the dopant is about 15 wt%, based on the total weight of the first host and the dopant) are co-deposited on the hole transport region to form an emission layer having the thickness of.

[0763] Compound ET17 and LiQ are co-deposited on the emission layer at a weight ratio of 5:5 to form an electron transport layer having the thickness of. Then, LiQ is deposited on the electron transport layer to form an electron injection layer having the thickness of, and Al is formed on the electron injection layer to the thickness of, thereby completing the fabrication of the organic light-emitting device.

[0764] Comparative Examples 1 and 2

[0765] The organic light-emitting devices are each fabricated in the same manner as in Example 1, except that: the compounds shown in Table 4 are used as the dopant when forming the emission layer.

[0766] Example 2

[0767] The organic light-emitting device is fabricated in the same manner as in Example 1, except that: the first host and the second host shown in Table 4 are used instead of the first host when forming the emission layer.

[0768] Comparative Examples 3 and 4

[0769] The organic light-emitting devices are each fabricated in the same manner as in Example 2, except that: the compounds shown in Table 4 are used as the dopant when forming the emission layer.

[0770] Evaluation of Example 2: Measurement of OLED Lifetime and External Quantum Efficiency

[0771] The external quantum efficiency (EQE) and lifetime of the organic light-emitting devices fabricated according to Example 1 and 2 and Comparative Examples 1 to 4 are evaluated. The results are calculated as relative values (%) and shown in Table 4. Here, a luminance meter (Minolta Cs-1000A) is used as the evaluation instrument. The lifetime (T 95 ) is determined by evaluating the time taken to reach 95% of the luminance compared to the initial luminance (100%) under the same luminance measurement conditions.

[0772] The results obtained through the above evaluation are calculated as relative values (%) based on the values of Comparative Example 1 or Comparative Example 3, and shown in Table 4.

[0773] Table 4

[0774]

[0775]

[0776] Referring to Table 4, confirm that the organic light-emitting devices of Examples 1 and 2 have a long lifespan and / or high efficiency as compared to the organic light-emitting devices of Comparative Examples 1 to 4. In particular, since Compound X of Comparative Examples 1 and 3 has a relatively small ΔE as compared to Compound Z ST , it is generally expected that Compound X emits TADF, but it is found that Compound X has a low efficiency as compared to the organic light-emitting devices of Examples 1 and 2. That is, in the case of using a compound that satisfies all of Conditions 1 to 4 in an organic light-emitting device, although it is a large ΔE ST , it exhibits delayed fluorescence characteristics, and thus, it is confirmed that an organic light-emitting device having a relatively high efficiency can be provided.

[0777] According to one or more embodiments, the organic light-emitting device may have improved efficiency and / or improved lifespan.

[0778] It should be understood that the embodiments described herein should be considered only in the described sense and not for purposes of limitation. The description of a feature or aspect in each embodiment should typically be considered applicable to other similar features or aspects in other embodiments.

[0779] Although one or more embodiments have been described with reference to the accompanying drawings, those of ordinary skill in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope as defined by the appended claims.

Claims

1. An organic light-emitting device, comprising: A first electrode; A second electrode; And An organic layer disposed between the first electrode and the second electrode and including an emission layer, Wherein the emission layer is composed of a host, a first compound, and a fluorescent dopant, The first compound satisfies the following conditions 1 to 4: <Condition 1> ΔE ST > ΔE ST2 + ΔE' TT <Condition 2> 0eV < ΔE ST2 +ΔE' TT ≤ 1.0eV <Condition 3> 0eV < ΔE' TT ≤ 0.15eV <Condition 4> ΔE ST2 > 0 eV Wherein, among conditions 1 to 4, ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound; ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound; And ΔE' TT represents the difference between the second lowest singlet excitation energy level calculated for the T2 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound The host, the first compound, and the fluorescent dopant satisfy the following condition B: <Condition B> E(H B ) S1 >E S1 >E(F B ) S1 In condition B, E(H B ) S1 represents the lowest singlet excitation energy level of the said main body; E S1 represents the lowest singlet excitation energy level of the first compound; and E(F B ) S1 represents the lowest singlet excited energy level of the fluorescent dopant.

2. An organic light-emitting device, comprising: A first electrode; A second electrode; m light-emitting units, which are disposed between the first electrode and the second electrode and include at least one emission layer; And m - 1 charge generation layers, which are disposed between two adjacent light-emitting units among the m light-emitting units, and the charge generation layers include an n-type charge generation layer and a p-type charge generation layer, Wherein m is an integer of 2 or greater, The maximum emission wavelength of the light emitted from at least one of the m light-emitting units is different from the maximum emission wavelength of the light emitted from at least one of the remaining light-emitting units, and The emission layer is composed of a host, a first compound, and a fluorescent dopant, The first compound satisfies the following conditions 1 to 4: <Condition 1> ΔE ST >ΔE ST2 +ΔE' TT <Condition 2> 0eV < ΔE ST2 + ΔE' TT ≤ 1.0eV <Condition 3> 0eV < ΔE' TT ≤0.15eV <Condition 4> ΔE ST2 >0eV Wherein, among conditions 1 to 4, ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound; ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound; And ΔE' TT represents the difference between the second lowest singlet excitation energy level calculated for the T2 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound. The host, the first compound, and the fluorescent dopant satisfy the following condition B: <Condition B> E(H B ) S1 >E S1 >E(F B ) S1 In condition B, E(H B ) S1 represents the lowest singlet excitation level of the said main body; E S1 represents the lowest singlet excitation energy level of the first compound; and E(F B ) S1 represents the lowest singlet excitation energy level of the fluorescent dopant.

3. An organic light-emitting device, comprising: A first electrode; A second electrode; And m emission layers disposed between the first electrode and the second electrode, Wherein m is an integer of 2 or greater, The maximum emission wavelength of the light emitted from at least one of the m emission layers is different from the maximum emission wavelength of the light emitted from at least one of the remaining emission layers, and The emission layer is composed of a host, a first compound, and a fluorescent dopant, The first compound satisfies the following conditions 1 to 4: <Condition 1> ΔE ST >ΔE ST2 +ΔE' TT <Condition 2> 0eV < ΔE ST2 +ΔE' TT ≤ 1.0eV <Condition 3> 0 eV < ΔE' TT ≤ 0.15 eV <Condition 4> ΔE ST2 > 0 eV Wherein, among conditions 1 to 4, ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound; ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound; And ΔE' TT represents the difference between the second lowest singlet excitation energy level calculated for the T2 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound The host, the first compound, and the fluorescent dopant satisfy the following condition B: <Condition B> E(H B ) S1 >E S1 >E(F B ) S1 In condition B, E(H B ) S1 represents the lowest singlet excitation energy level of the said main body; E S1 represents the lowest singlet excitation energy level of the first compound; and E(F B ) S1 represents the lowest singlet excitation energy level of the fluorescent dopant.

4. The organic light-emitting device according to any one of claims 1 - 3, wherein the first compound further satisfies the following condition 5: <Condition 5> ΔE ST2 ≤0.1 eV Among them, In condition 5, ΔE ST2 represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T2 equilibrium structure of the first compound.

5. The organic light-emitting device according to any one of claims 1 - 3, wherein the first compound further satisfies the following condition 6 <Condition 6> ΔE ST > 0.2 eV Among them, In condition 6, ΔE ST represents the difference between the lowest singlet excitation energy level calculated for the S1 equilibrium structure of the first compound and the lowest triplet excitation energy level calculated for the T1 equilibrium structure of the first compound.

6. The organic light-emitting device according to any one of claims 1 - 3, wherein The ratio of the light emitted by the fluorescent dopant to all the light emitted by the emission layer is 80% or greater.

7. The organic light-emitting device according to claim 6, wherein Neither the host nor the first compound emits light.

8. The organic light-emitting device according to claim 6, wherein The host includes an amphoteric host, an electron-transporting host, a hole-transporting host, or any combination thereof, The electron transport host includes at least one electron transport part, the hole transport host does not include an electron transport part, and the electron transport part is a cyano group, a cyclic group containing nitrogen with a deficient π electron, a group represented by one of the following formulas, or any combination thereof: Among them, In the above formulas, *, *', and *" each represent a bonding site to an adjacent atom.

9. The organic light-emitting device according to claim 8, wherein the electron transport host includes at least one cyclic group without nitrogen having a deficient π electron and at least one electron transport part, the hole transport host includes at least one cyclic group without nitrogen having a deficient π electron, but does not include an electron transport part, and the electron transport part is a cyano group or a cyclic group containing nitrogen with a deficient π electron.

10. The organic light-emitting device according to claim 9, wherein the cyclic group containing nitrogen with a deficient π electron is: an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an iso oxazole 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 benzo oxazole group, an isobenzo oxazole group, a triazole group, a tetrazole group, a dioxazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, or an azacarbazole group; or a condensed ring of two or more cyclic groups containing nitrogen with a deficient π electron, and the at least one cyclic group without nitrogen having a deficient π electron is: a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthene 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 benzo[9,10]phenanthrene group, a pyrene group, a perylene group, a picene group, a pentacene group, a hexacene group, a pentaphene group, a rubicene group, a coronene 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 indolocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothiophenocarbazole group, or a triindolobenzene group; or a condensed ring of two or more cyclic groups without nitrogen having a deficient π electron.

11. The organic light-emitting device according to claim 8, wherein the electron transport host includes i) a cyano group, a pyrimidine group, a pyrazine group, a triazine group, or any combination thereof, and ii) a benzo[9,10]phenanthrene group, and the hole transport host includes a carbazole group.

12. The organic light-emitting device according to claim 6, wherein the maximum wavelength of the emission spectrum of the dopant is 400 nm or greater and 550 nm or less.

13. The organic light-emitting device according to claim 6, wherein the dopant does not include a metal atom.

14. The organic light-emitting device according to claim 6, wherein The dopant includes a core containing naphthalene, a core containing fluorene, a core containing spiro-bifluorene, a core containing benzofluorene, a core containing dibenzofluorene, a core containing phenanthrene, a core containing anthracene, a core containing fluoranthene, a core containing benzo[9,10]phenanthrene, a core containing pyrene, a core containing a core containing pentacene, a core containing picene, a core containing perylene, a core containing pentaphene, a core containing indenoanthracene, a core containing bianthracene, or one of the cores represented by Formulas 501-1 to 501-18:

15. The organic light-emitting device according to any one of claims 1-3, wherein the first compound is represented by formula 101 or 102: Among them, In formulas 101 and 102, A 21 is a receptor group, D 21 is a donor group, m21 is 1, 2, or 3, n21 is 1, 2, or 3, the sum of n21 and m21 in formula 101 is 6 or less, the sum of n21 and m21 in formula 102 is 5 or less, R 21 is hydrogen, deuterium, -F, -Cl, -Br, -I, -SF5, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, substituted or unsubstituted C1-C 60 alkyl, substituted or unsubstituted C2-C 60 alkenyl, substituted or unsubstituted C2-C 60 alkynyl, substituted or unsubstituted C1-C 60 alkoxy, substituted or unsubstituted C3-C 10 cycloalkyl, substituted or unsubstituted C2-C 10 heterocycloalkyl, substituted or unsubstituted C3-C 10 cycloalkenyl, substituted or unsubstituted C2-C 10 heterocycloalkenyl, substituted or unsubstituted C6-C 60 aryl, substituted or unsubstituted C7-C 60 alkaryl, substituted or unsubstituted C6-C 60 aryloxy, substituted or unsubstituted C6-C 60 arylthio, substituted or unsubstituted C1-C 60 heteroaryl, substituted or unsubstituted C2-C 60 alkylheteroaryl, substituted or unsubstituted C1-C 60 heteroaryloxy, substituted or unsubstituted C1-C 60 heteroarylthio, substituted or unsubstituted monovalent non-aromatic fused polycyclic group, substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group, -Si(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), where multiple Rs 21 are optionally linked to each other to form a substituted or unsubstituted C5-C 30 carbocyclic group or a substituted or unsubstituted C1-C 30 heterocyclic group, and Q1 - Q3 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, cyano, nitro, amidino, hydrazino, hydrazono, C1-C 60 alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl, C1-C 60 alkoxy, C3-C 10 cycloalkyl, C2-C 10 heterocycloalkyl, C3-C 10 cycloalkenyl, C2-C 10 heterocycloalkenyl, C6-C 60 aryl, C7-C 60 alkaryl, C6-C 60 aryloxy, C6-C 60 arylthio, C1-C 60 heteroaryl, C2-C 60 alkylheteroaryl, C1-C 60 heteroaryloxy, C1-C 60 heteroarylthio, a monovalent non-aromatic fused polycyclic group, a monovalent non-aromatic fused heteropolycyclic group, a C1-C group substituted with at least one deuterium, -F, cyano, C1-C 60 alkyl, C6-C 60 aryl, or any combination thereof, substituted C1-C 60 alkyl, or a C6-C group substituted with at least one deuterium, -F, cyano, C1-C 60 alkyl, C6-C 60 aryl, or any combination thereof, substituted C6-C 60 aryl.

16. The organic light-emitting device according to claim 15, wherein A 21 is a substituted or unsubstituted cyclic group without nitrogen lacking π electrons D 21 is: -F, a cyano group, or a cyclic group containing nitrogen with a deficient π electron; C1-C each substituted by at least one -F, cyano, or any combination thereof 60 alkyl group, cyclic group containing electron-deficient nitrogen, or cyclic group not containing electron-deficient nitrogen; or A cyclic group containing nitrogen with a lack of π electrons replaced by: deuterium, C1-C 60 alkyl group, a cyclic group containing nitrogen with a lack of π electrons, a cyclic group without a lack of π electrons, or any combination thereof, the cyclic group without nitrogen having a deficient π electron is: a benzene group, a heptalene group, an indene group, a naphthalene group, an azulene group, an indacene group, an acenaphthene 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 benzo[9,10]phenanthrene group, a pyrene group, a perylene group, a picene group, a pentacene group, a hexacene group, a pentaphene group, a rubicene group, a coronene 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 indolocarbazole group, an indolocarbazole group, a benzofurocarbazole group, a benzothienocarbazole group, or a triindolobenzene group; or a condensed ring of two or more cyclic groups without nitrogen having a deficient π electron, and the cyclic group containing nitrogen with a deficient π electron includes at least one *-N=*' part and is: imidazole group, pyrazole group, thiazole group, isothiazole group, azole group, iso- azole group, pyridine group, pyrazine group, pyridazine group, pyrimidine group, indazole group, purine group, quinoline group, isoquinoline group, benzoquinoline group, phthalazine group, naphthyridine group, quinoxaline group, quinazoline group, cinnoline group, phenanthridine group, acridine group, phenanthroline group, phenazine group, benzimidazole group, isobenzothiazole group, benzo- azole group, isobenzo- azole group, triazole group, tetrazole group, diazole group, triazine group, thiadiazole group, imidazopyridine group, imidazopyrimidine group, azacarbazole group, or benzimidazolobenzimidazole group; or a condensed ring of two or more cyclic groups containing nitrogen with a deficient π electron.

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