Light emitting device and electronic device including the same

Abstract

Embodiments provide a light emitting device and an electronic device including the same. The light emitting device includes a first electrode, a second electrode, and an interlayer between the first electrode and the second electrode. The interlayer includes a hole transport layer, a first electron blocking layer, a second electron blocking layer, an emission layer, a hole blocking layer, and an electron transport layer, and the emission layer includes an electron transport host, a hole transport host, a first dopant, and a second dopant. Among the absolute value of the highest occupied molecular orbital (HOMO) energy level of the hole transport layer, the absolute value of the HOMO energy level of the first electron blocking layer, the absolute value of the HOMO energy level of the second electron blocking layer, and the absolute value of the HOMO energy level of the hole transport host, the absolute value of the HOMO energy level of the first electron blocking layer is the maximum.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0066591, filed on May 22, 2024, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments relate to light-emitting devices and electronic devices including light-emitting devices. Background Technology

[0004] The light-emitting device is a self-emitting device, which, compared with devices in related fields, has a wide viewing angle, high contrast, short response time, and superior characteristics in terms of brightness, driving voltage, and response speed.

[0005] In a light-emitting device, a first electrode may be disposed on a substrate, and a hole transport region, an emitter layer, an electron transport region, and a second electrode may be sequentially formed on the first electrode. Holes supplied from the first electrode move toward the emitter layer through the hole transport region, and electrons supplied from the second electrode move toward the emitter layer through the electron transport region. Charge carriers, such as holes and electrons, recombine in the emitter layer to generate light.

[0006] It should be understood that this background section is intended to provide useful background for understanding the technology. However, this background section may also include ideas, concepts, or knowledge that were not known or understood by those skilled in the art prior to the effective filing date corresponding to the subject matter disclosed herein. Summary of the Invention

[0007] The implementation includes a light-emitting device with improved luminous efficiency and long lifespan.

[0008] Other 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 embodiments of this disclosure.

[0009] According to an embodiment, the light-emitting device may include

[0010] First electrode,

[0011] The second electrode facing the first electrode, and

[0012] In the interlayer between the first electrode and the second electrode,

[0013] The interlayer may include a hole transport layer, a first electron blocking layer, a second electron blocking layer, an emitter layer, a hole blocking layer, and an electron transport layer.

[0014] The emitter layer may include an electron transport host, a hole transport host, a first dopant, and a second dopant.

[0015] The hole transport layer, the first electron blocking layer, the second electron blocking layer, the emission layer, the hole blocking layer, and the electron transport layer can be in contact with each other,

[0016] Among an absolute value of a highest occupied molecular orbital (HOMO) level of the hole transport layer, an absolute value of a HOMO level of the first electron blocking layer, an absolute value of a HOMO level of the second electron blocking layer, and an absolute value of a HOMO level of the hole transport host, the absolute value of the HOMO level of the first electron blocking layer can be the largest,

[0017] The first dopant can be a metal-containing compound, and

[0018] The second dopant can be a metal-free compound.

[0019] In an embodiment, the first electrode can be an anode; the second electrode can be a cathode; and the sandwich can further include a hole injection layer between the first electrode and the emission layer and / or an electron injection layer between the second electrode and the emission layer.

[0020] In an embodiment, the emission layer can emit blue light.

[0021] In an embodiment, among an absolute value of a HOMO level of the hole transport layer, an absolute value of a HOMO level of the first electron blocking layer, an absolute value of a HOMO level of the second electron blocking layer, and an absolute value of a HOMO level of the hole transport host, the absolute value of the HOMO level of the hole transport layer can be the smallest.

[0022] In an embodiment, an absolute value of a HOMO level of the hole transport host can be greater than an absolute value of a HOMO level of the second electron blocking layer.

[0023] In an embodiment, an absolute value of a difference between the absolute value of the HOMO level of the hole transport layer and the absolute value of the HOMO level of the first electron blocking layer can be equal to or greater than about 0.35 eV.

[0024] In an embodiment, the hole blocking layer can be a single layer; and an electron mobility of the hole blocking layer can be in a range of about 1.0E-08 cm 2 / Vs to about 5.0E-06 cm 2 / Vs.

[0025] In an embodiment, the hole blocking layer can include a first hole blocking layer and a second hole blocking layer; the first hole blocking layer can directly contact the electron transport layer; and an electron mobility of the first hole blocking layer can be in a range of about 1.0E-08 cm 2 / Vs to about 5.0E-06 cm 2 / Vs.

[0026] In an embodiment, the emission layer, the second hole blocking layer, and the first hole blocking layer can be in contact with each other; and among an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level of the electron transport host of the emission layer, an absolute value of a LUMO energy level of the second hole blocking layer, and an absolute value of a LUMO energy level of the first hole blocking layer, the absolute value of the LUMO energy level of the electron transport host can be the largest, and the absolute value of the LUMO energy level of the first hole blocking layer can be the smallest.

[0027] In an embodiment, an absolute value of a difference between the absolute value of the LUMO energy level of the electron transport host and the absolute value of the LUMO energy level of the first hole blocking layer can be equal to or less than about 0.2 eV.

[0028] In an embodiment, the second hole blocking layer and the emission layer can be in direct contact with each other.

[0029] In an embodiment, the first dopant can include a phosphorescent dopant.

[0030] In an embodiment, the second dopant can include a delayed fluorescence dopant.

[0031] In an embodiment, an amount of the first dopant can be in a range of about 3 wt% to about 20 wt% based on 100 wt% of the emission layer.

[0032] In an embodiment, an amount of the second dopant can be in a range of about 0.1 wt% to about 2 wt% based on 100 wt% of the emission layer.

[0033] In an embodiment, the hole transport host can include a compound represented by Formula 301-1, a compound represented by Formula 301-2, or any combination thereof, wherein Formula 301-1 and Formula 301-2 are explained below.

[0034] In an embodiment, the electron transport host can include a compound represented by Formula 1 explained below.

[0035] In an embodiment, the first dopant can include an organometallic compound represented by Formula 401 explained below.

[0036] In an embodiment, the second dopant can include a compound represented by Formula 2 explained below.

[0037] According to an embodiment, an electronic device can include a light emitting apparatus.

[0038] It should be understood that the above-described embodiments are described only for general and explanatory purposes and not for limiting purposes, and the present disclosure is not limited to the above-described embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the embodiments, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and principles of the present disclosure. The above and other aspects and features of the present disclosure will become more apparent from the detailed description of embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0040] Figure 1 This is a schematic cross-sectional view of the light-emitting device according to an embodiment;

[0041] Figure 2 This is a schematic cross-sectional view of an electronic device according to an embodiment; and

[0042] Figure 3 This is a schematic cross-sectional view of an electronic device according to another embodiment. Detailed Implementation

[0043] The present disclosure will now be described more fully below with reference to the accompanying drawings, in which embodiments are illustrated. However, the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0044] In the accompanying drawings, the dimensions (e.g., thickness), scale, and dimensions of the elements may be enlarged for ease of description and clarity. The same reference numerals and reference characters refer to the same elements throughout.

[0045] In this specification, it will be understood that when an element (or section, layer, part, etc.) is described as being "on," "connected to," or "attached to" another element (or section, layer, part, etc.), it may be directly on, directly connected to, or directly attached to the other element (or section, layer, part, etc.), or one or more intervening elements (or sections, layers, parts, etc.) may exist between them. In a similar sense, when an element (or section, layer, part, etc.) is described as "covering" another element (or section, layer, part, etc.), it may directly cover the other element (or section, layer, part, etc.), or one or more intervening elements (or sections, layers, parts, etc.) may exist between them.

[0046] In the specification, when an element is "directly on" another element, "directly connected to" another element, or "directly attached to" another element, there is no intermediary element. For example, "directly on" can mean that two layers or two elements are disposed without any other element between them (e.g., an adhesive element).

[0047] In the specification, expressions used in the singular form, such as “a”, “an”, and “the”, are intended to include the plural form as well, unless the context clearly indicates otherwise.

[0048] In this specification, the term "and / or" includes any and all combinations of one or more related listed items. For example, "A and / or B" can be understood to mean "A, B, or A and B". The terms "and" and "or" can be used to connect or separate meanings and can be understood as equivalent to "and / or".

[0049] In the specification and claims, the term "at least one of..." is intended to include the meaning of "at least one selected from the group consisting of..." for the purposes of its meaning and interpretation. For example, "at least one of A, B, and C" can be understood to mean only A, only B, only C, or any combination of two or more of A, B, and C (e.g., ABC, ACC, BC, or CC). When following a list of elements, the term "at least one of..." modifies the entire list of elements and does not modify any individual element in the list.

[0050] It will be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, a first element may be referred to as a second element. Similarly, without departing from the scope of this disclosure, a second element may be referred to as a first element.

[0051] For ease of description, the spatial relative terms “below,” “under,” “down,” “above,” or “above,” etc., may be used herein to describe the relationship between one element or component and another, as illustrated in the accompanying drawings. It will be understood that, in addition to the orientation depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, in the case of flipping the device illustrated in the drawings, the device located “below” or “under” another device may be placed “above” the other device. Accordingly, the interpretative term “below” may include both a lower position and an upper position. The device may also be oriented in other directions, and therefore the spatial relative terms may be interpreted differently depending on the orientation.

[0052] As used herein, the terms “about” or “approximately” include the stated value and mean within an acceptable range of deviation for the stated value, considering that a person skilled in the art would take into account the measurement in question and the errors associated with the measurement of the stated quantity (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations of the stated value, or within ±20%, ±10%, or ±5% of the stated value.

[0053] It should be understood that the terms “comprises,” “comprising,” “includes,” “including,” “have,” “having,” “contains,” and “containing” are intended to indicate the presence of any of the described features, integers, steps, operations, elements, components, or any combination thereof in this disclosure, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or any combination thereof.

[0054] Unless otherwise specified or implied herein, all terms used (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an ideal or overly formal sense unless clearly defined in the specification.

[0055] According to an embodiment, the light-emitting device may include:

[0056] First electrode;

[0057] The second electrode facing the first electrode; and

[0058] In the interlayer between the first electrode and the second electrode,

[0059] The interlayer may include a hole transport layer, a first electron blocking layer, a second electron blocking layer, an emitter layer, a hole blocking layer, and an electron transport layer.

[0060] The emitter layer may include an electron transport host, a hole transport host, a first dopant, and a second dopant.

[0061] The hole transport layer, the first electron blocking layer, the second electron blocking layer, the emitter layer, the hole blocking layer, and the electron transport layer can be in contact with each other.

[0062] Among the absolute values ​​of the highest occupied molecular orbital (HOMO) energy level of the hole transport layer, the absolute values ​​of the HOMO energy level of the first electron blocking layer, the absolute values ​​of the HOMO energy level of the second electron blocking layer, and the absolute values ​​of the HOMO energy level of the hole transport host, the absolute value of the HOMO energy level of the first electron blocking layer can be the largest.

[0063] The first dopant can be a metal-containing compound, and

[0064] The second dopant can be a metal-free compound.

[0065] In the specification, the phrase "the hole transport layer, the first electron blocking layer, the second electron blocking layer, the emitter layer, the hole blocking layer, and the electron transport layer can contact each other" encompasses embodiments where no other layers exist between the hole transport layer, the first electron blocking layer, the second electron blocking layer, the emitter layer, the hole blocking layer, and the electron transport layer. For example, the hole transport layer may contact (e.g., directly contact) the first electron blocking layer; the first electron blocking layer may contact (e.g., directly contact) the hole transport layer and the second electron blocking layer; the second electron blocking layer may contact (e.g., directly contact) the first electron blocking layer and the emitter layer; the emitter layer may contact (e.g., directly contact) the second electron blocking layer and the hole blocking layer; the hole blocking layer may contact (e.g., directly contact) the emitter layer and the electron transport layer; and the electron transport layer may contact (e.g., directly contact) the hole blocking layer. When there are two hole blocking layers, no other layers may exist between the hole transport layer, the first electron blocking layer, the second electron blocking layer, the emitter layer, the two hole blocking layers, and the electron transport layer.

[0066] According to one embodiment, the hole transport layer can directly contact the first electron blocking layer. According to one embodiment, the first electron blocking layer can directly contact the second electron blocking layer. According to one embodiment, the second electron blocking layer can directly contact the emitter layer. According to one embodiment, the emitter layer can directly contact the hole blocking layer. According to one embodiment, the hole blocking layer can directly contact the electron transport layer.

[0067] According to the implementation, in the case where there are two hole blocking layers, one hole blocking layer can directly contact the emitter layer, and the other hole blocking layer can directly contact the electron transport layer.

[0068] In existing light-emitting devices, an excess of hole carriers in the emitter layer can lead to a biased carrier charge balance, resulting in a narrower, smaller emission region. This, in turn, causes increased triplet-triplet annihilation (TTA) and triplet polaron quenching (TPQ) and a reduced lifetime of the light-emitting device. This problem can occur, for example, in light-emitting devices comprising emitter layers with two types of host materials, phosphorescent dopants, and delayed fluorescence dopants.

[0069] According to an embodiment, the first electrode may be an anode, the second electrode may be a cathode, and the interlayer may further include a hole injection layer between the first electrode and the emitter layer and / or an electron injection layer between the second electrode and the emitter layer.

[0070] According to the embodiment, the emitting layer of the light-emitting device can emit blue light. For example, the maximum emission wavelength of the first dopant and the maximum emission wavelength of the second dopant can each be independently in the range of about 440 nm to about 470 nm.

[0071] According to the implementation method, among the absolute values ​​of the highest occupied molecular orbital (HOMO) energy level of the hole transport layer, the absolute values ​​of the HOMO energy level of the first electron blocking layer, the absolute values ​​of the HOMO energy level of the second electron blocking layer, and the absolute values ​​of the HOMO energy level of the hole transport host, the absolute value of the HOMO energy level of the hole transport layer can be the smallest.

[0072] According to the implementation method, the absolute value of the HOMO energy level of the hole transport host can be greater than the absolute value of the HOMO energy level of the second electron blocking layer.

[0073] According to the implementation method, the absolute value of the difference between the absolute value of the HOMO energy level of the hole transport layer and the absolute value of the HOMO energy level of the first electron blocking layer may be equal to or greater than about 0.35 eV.

[0074] Regarding the light-emitting device according to the embodiment, in which the absolute values ​​of the HOMO energy levels of the hole transport layer, the first electron blocking layer, the second electron blocking layer, and the hole transport body are related as described above, the excess of hole carriers can be controlled, and the lifetime of the light-emitting device can be improved by controlling the excitons concentrated in the emission region at the interface of the emission layer.

[0075] For example, since the HOMO level of the first electron blocking layer is deeper than the HOMO level of the hole transport layer, hole carrier injection delay can be induced and excitons concentrated in the emission region at the interface of the emission layer can be controlled. Due to the diffusion of triplet excitons, the exciton density is reduced and the lifetime of the light-emitting device is long.

[0076] Regarding the light-emitting device according to the embodiments, the specific structure of the compound included in each of these layers is not limited, as long as the energy level relationship between the layers of the interlayer satisfies the conditions described above.

[0077] According to the implementation method, the hole blocking layer can be a single layer, and the electron mobility of the hole blocking layer as a single layer can be approximately 1.0E-0.8 cm⁻¹. 2 / Vs to approximately 5.0E-06cm 2 In the range of / Vs. For example, the electron mobility of a hole-blocking layer as a single layer can be around 0.9E-0.7cm. 2 / Vs to approximately 9.0E-07cm 2 In the range of / Vs. For example, the electron mobility of a hole-blocking layer as a single layer can be around 2.0E-0.7cm. 2 / Vs to approximately 8.0E-07cm 2 Within the range of / Vs.

[0078] According to the implementation method, the emitting layer and the hole-blocking layer, which are individual layers, can be in direct contact with each other, and

[0079] The absolute value of the lowest unoccupied molecular orbital (LUMO) energy level of the electron transport host in the emitter layer can be greater than the absolute value of the LUMO energy level of the hole blocking layer, which is a single layer.

[0080] According to an embodiment, the hole blocking layer may include a first hole blocking layer and a second hole blocking layer, and the first hole blocking layer may directly contact the electron transport layer.

[0081] The electron mobility of the first hole-blocking layer can be approximately 1.0E-0.8 cm⁻¹. 2 / Vs to approximately 5.0E-06cm 2 Within the range of / Vs.

[0082] For example, the electron mobility of the first hole-blocking layer can be approximately 0.9E-0.7 cm⁻¹. 2 / Vs to approximately 9.0E-07cm 2 The range is / Vs. For example, the electron mobility of the first hole-blocking layer can be approximately 2.0E-07cm. 2 / Vs to approximately 8.0E-07cm 2 Within the range of / Vs.

[0083] When the electron mobility of the hole-blocking layer as a single layer or the electron mobility of the first hole-blocking layer are within these ranges, rapid injection of electron carriers can be induced. Accordingly, excitons concentrated in the emission region at the interface of the emission layer can be controlled, and thus, due to triplet exciton diffusion, the exciton density can be reduced, and the lifetime of the light-emitting device can be improved.

[0084] According to the implementation method, the emitting layer, the second hole-blocking layer, and the first hole-blocking layer can be in contact with each other, and

[0085] Among the absolute values ​​of the LUMO energy level of the electron transport host in the emitter layer, the absolute value of the LUMO energy level of the second hole blocking layer, and the absolute value of the LUMO energy level of the first hole blocking layer, the absolute value of the LUMO energy level of the electron transport host can be the largest, and the absolute value of the LUMO energy level of the first hole blocking layer can be the smallest.

[0086] According to the implementation method, the absolute value of the difference between the absolute value of the LUMO energy level of the electron transport host and the absolute value of the LUMO energy level of the first hole blocking layer may be equal to or less than about 0.2 eV.

[0087] According to the implementation method, the second hole-blocking layer and the emission layer can be in direct contact with each other.

[0088] In the case where the absolute values ​​of the LUMO energy levels of the electron transport host in the emitting layer, the LUMO energy levels of the second hole blocking layer, and the LUMO energy levels of the first hole blocking layer are as described above, the lifetime of the light-emitting device can be further improved by inducing more stable electron injection.

[0089] Regarding the light-emitting device according to the embodiment, the specific structure of the compound included in each of these layers is not limited, as long as the energy level relationship between the layers of the interlayer satisfies the conditions as described above, and the electron mobility of the hole blocking layer or the first hole blocking layer as a single layer is within these ranges.

[0090] In an implementation, the first dopant may include a phosphorescent dopant.

[0091] In an implementation, the second dopant may include a delayed fluorescence dopant.

[0092] In an embodiment, based on a 100 wt% emitter layer, the amount (wt%) of the first dopant can range from about 3 wt% to about 20 wt%. For example, based on a 100 wt% emitter layer, the amount (wt%) of the first dopant can range from about 5 wt% to about 20 wt%.

[0093] In an embodiment, based on a 100 wt% emitter layer, the amount (wt%) of the second dopant can range from about 0.1 wt% to about 2 wt%. For example, based on a 100 wt% emitter layer, the amount (wt%) of the second dopant can range from about 0.5 wt% to about 2 wt%.

[0094] The total amount (wt%) of the electron transport host, hole transport host, first dopant, and second dopant can be 100 wt%.

[0095] In this embodiment, the weight ratio of the hole transporter to the electron transporter can be in the range of about 9:1 to about 1:9. For example, the weight ratio of the hole transporter to the electron transporter can be in the range of about 5:4 to about 4:5.

[0096] The host and dopants will be described in further detail below.

[0097] According to another embodiment, the electronic device may include a light-emitting device.

[0098] In some embodiments, the electronic device may further include a thin-film transistor.

[0099] The thin-film transistor may include a source electrode and a drain electrode, and

[0100] The first electrode of the light-emitting device can be electrically connected to at least one of the source electrode and the drain electrode of the thin-film transistor.

[0101] In an embodiment, the electronic device may further include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof.

[0102] In the specification, the term "interlayer" may refer to a single layer and / or multiple layers between the first and second electrodes of the light-emitting device.

[0103] [ Figure 1 [Description]

[0104] Figure 1 This is a schematic cross-sectional view of the light-emitting device 10 according to an embodiment. The light-emitting device 10 includes a first electrode 110, a sandwich layer 130, and a second electrode 150.

[0105] The following text is for reference only. Figure 1 The structure of the light-emitting device 10 according to the embodiment and the method of manufacturing the light-emitting device 10 are described.

[0106] [First Electrode 110]

[0107] exist Figure 1 The substrate may be further included below the first electrode 110 or on the second electrode 150. The substrate may be a glass substrate or a plastic substrate. In embodiments, the substrate may be a flexible substrate and may include plastics with excellent heat resistance and durability (e.g., polyimide, polyethylene terephthalate (PET), polycarbonate, polyethylene naphthalate, polyarylate (PAR), polyetherimide, or any combination thereof).

[0108] The first electrode 110 can be formed, for example, by depositing or sputtering a material for forming the first electrode 110 on a substrate. When the first electrode 110 is an anode, the material for forming the first electrode 110 can be a high work function material that facilitates hole injection.

[0109] The first electrode 110 may be a reflective electrode, a transmissive-reflective electrode, or a transmissive electrode. When the first electrode 110 is a transmissive electrode, the material used to form the first electrode 110 may include indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), or any combination thereof. In embodiments, when the first electrode 110 is a transmissive-reflective electrode or a reflective electrode, the material used to form the first electrode 110 may include magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), or any combination thereof.

[0110] The first electrode 110 may have a single-layer structure consisting of a single layer or a multi-layer structure including multiple layers. In an embodiment, the first electrode 110 may have a three-layer structure of ITO / Ag / ITO.

[0111] [Mezzanine 130]

[0112] The interlayer 130 may be disposed on the first electrode 110. The interlayer 130 includes an emission layer.

[0113] The interlayer 130 may further include a hole transport region between the first electrode 110 and the emitter layer, and an electron transport region between the emitter layer and the second electrode 150.

[0114] In addition to various organic materials, the interlayer 130 may further include metal-containing compounds (e.g., organometallic compounds) or inorganic materials (e.g., quantum dots).

[0115] In an embodiment, the interlayer 130 may include two or more emitting layers stacked between the first electrode 110 and the second electrode 150, and at least one charge generating layer between adjacent layers in the two or more emitting layers. When the interlayer 130 includes two or more emitting layers and at least one charge generating layer as described above, the light-emitting device 10 may be a series light-emitting device.

[0116] [Hole transport region in interlayer 130]

[0117] Hole transport regions can have a single-layer structure consisting of a single layer (composed of a single material), a single-layer structure consisting of a single layer comprising different materials, or a multi-layer structure comprising multiple layers containing different materials.

[0118] The hole transport region may include a hole injection layer, a hole transport layer, an emission assist layer, an electron blocking layer, or any combination thereof.

[0119] In an embodiment, the hole transport region may have a hole injection layer / hole transport layer structure, a hole injection layer / hole transport layer / emission auxiliary layer structure, a hole injection layer / emission auxiliary layer structure, a hole transport layer / emission auxiliary layer structure, or a hole injection layer / hole transport layer / electron blocking layer structure, wherein the layers of each structure may be stacked from the first electrode 110 in the order described therein, but the structure of the hole transport region is not limited to these.

[0120] According to an embodiment, the hole transport region may have a multilayer structure comprising a hole injection layer / hole transport layer / first electron blocking layer / second electron blocking layer stacked from the first electrode 110 in the order described.

[0121] In an implementation, the hole transport region may include a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof:

[0122] [Formula 201]

[0123]

[0124] [Equation 202]

[0125]

[0126] In equations 201 and 202,

[0127] L 201 To L 204 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0128] L 205 It can be *-O-*', *-S-*', or *-N(Q) 201 )-*', unsubstituted or by at least one R 10a Replacement C1-C 20 Alkylene, unsubstituted, or with at least one R 10a Replacement C2-C 20 alkenyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0129] xa1 to xa4 can each be an integer selected from 0 to 5 independently.

[0130] xa5 can be an integer selected from 1 to 10.

[0131] R 201 To R 204 and Q 201 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0132] R 201 and R 202 Optionally via a single bond, unsubstituted, or by at least one R 10a Substituted C1-C5 alkylene groups or unsubstituted or with at least one R 10a The substituted C2-C5 alkenyl groups bond to each other to form unsubstituted or substituted compounds with at least one R group. 10a Replacement C8-C 60Polycyclic groups (e.g., carbazole group) (e.g., compound HT16),

[0133] R 203 and R 204 Optionally via a single bond, unsubstituted, or by at least one R 10a Substituted C1-C5 alkylene groups or unsubstituted or with at least one R 10a The substituted C2-C5 alkenyl groups bond to each other to form unsubstituted or substituted compounds with at least one R group. 10a Replacement C8-C 60 Polycyclic groups, and

[0134] na1 can be an integer selected from 1 to 4.

[0135] In embodiments, the compound represented by formula 201 and the compound represented by formula 202 may each independently include at least one of the groups represented by formulas CY201 to CY217:

[0136]

[0137] In equations CY201 to CY217, R 10b and R 10c Each can be independently compared with reference R. 10a The descriptions are the same, CY ring 201 To CY 204 Each can be independently C3-C 20 Carbocyclic or C1-C 20 Heterocyclic group, and at least one hydrogen in formulas CY201 to CY217 may be unsubstituted or R-substituted. 10a replace.

[0138] In the implementation, in formulas CY201 to CY217, the ring CY 201 To CY 204 Each can be independently phenyl, naphthyl, phenanthryl or anthracene.

[0139] In embodiments, the compound represented by formula 201 and the compound represented by formula 202 may each independently include at least one of the groups represented by formulas CY201 to CY203.

[0140] In an embodiment, the compound represented by formula 201 may include at least one of the groups represented by formulas CY201 to CY203 and at least one of the groups represented by formulas CY204 to CY217.

[0141] In the implementation, in formula 201, xa1 can be 1, R 201It can be a group represented by one of the formulas CY201 to CY203, xa2 can be 0, and R 202 It can be a group represented by one of the formulas CY204 to CY207.

[0142] In an embodiment, the compound represented by formula 201 and the compound represented by formula 202 may each not include the groups represented by formulas CY201 to CY203.

[0143] In embodiments, the compound represented by formula 201 and the compound represented by formula 202 may each not include the groups represented by formulas CY201 to CY203 and may each independently include at least one of the groups represented by formulas CY204 to CY217.

[0144] In embodiments, the compounds represented by formula 201 and the compounds represented by formula 202 may each not include the groups represented by formulas CY201 to CY217.

[0145] In embodiments, the hole transport region may include one of compounds HT1 to HT46, m-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, spiroTPD, spiroNPB, methylated NPB, TAPC, HMTPD, 4,4',4”-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline / dodecylbenzenesulfonic acid (PANI / DBSA), poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate) (PEDOT / PSS), polyaniline / camphorsulfonic acid (PANI / CSA), polyaniline / poly(4-styrenesulfonate) (PANI / PSS), compound 1, compound 2, compound HT-08, or any combination thereof:

[0146]

[0147]

[0148]

[0149]

[0150]

[0151] The thickness of the hole transport region can be approximately to approximately Within a certain range. For example, the thickness of the hole transport region can be approximately... to approximately Within the range. When the hole transport region includes a hole injection layer, a hole transport layer, an electron blocking layer, or any combination thereof, the thickness of the hole injection layer can be approximately... to approximately Within a certain range, and the thickness of the hole transport layer can be approximately... to approximately Within a certain range. For example, the thickness of the hole injection layer can be approximately... to approximately Within a certain range. For example, the thickness of the hole transport layer can be approximately... to approximately Within a certain range. The thickness of the electron blocking layer can be approximately... to approximately Within a certain range. For example, the thickness of the electron blocking layer can be approximately... to approximately Within the range described above, when the electron blocking layer includes a first electron blocking layer and a second electron blocking layer, the thicknesses of the first electron blocking layer and the second electron blocking layer can each be independently within the range described above. When the thicknesses of the hole transport region, the hole injection layer, the electron blocking layer, and the hole transport layer are within these ranges, satisfactory hole transport characteristics can be obtained without significantly increasing the driving voltage.

[0152] The emission assist layer can increase luminous efficiency by compensating for the optical resonant distance according to the wavelength of the light emitted by the emission layer, and the electron blocking layer can block electron leakage from the emission layer to the hole transport region. The material that may be included in the hole transport region may be included in the hole transport layer, the emission assist layer, the first electron blocking layer, and the second electron blocking layer.

[0153] [p-dopant]

[0154] In addition to these materials, the hole transport region may further include a charge-generating material for improving conductivity. The charge-generating material may be uniformly or non-uniformly dispersed in the hole transport region (e.g., in the form of a single layer composed of the charge-generating material).

[0155] The charge-generating material can be, for example, a p-doped agent.

[0156] For example, p-doped agents can have a lowest unoccupied molecular orbital (LUMO) energy level equal to or less than about -3.5 eV.

[0157] In embodiments, p-dopersive agents may include quinone derivatives, cyano-containing compounds, compounds comprising elements EL1 and EL2, or any combination thereof.

[0158] Examples of quinone derivatives may include TCNQ and F4-TCNQ.

[0159] Examples of cyano-containing compounds may include HAT-CN and compounds represented by formula 221:

[0160]

[0161] [Equation 221]

[0162]

[0163] In Equation 221,

[0164] R 221 To R 223 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic groups, and

[0165] R 221 To R 223 At least one of them can be independently replaced by C3-C as described below. 60 Carbocyclic or C1-C 60 Heterocyclic groups: cyano; -F; -Cl; -Br; -I; C1-C substituted with cyano, -F, -Cl, -Br, -I or any combination thereof 20 Alkyl groups; or any combination thereof.

[0166] In a compound comprising elements EL1 and EL2, element EL1 may be a metal, a metalloid, or any combination thereof, and element EL2 may be a nonmetal, a metalloid, or any combination thereof.

[0167] Examples of metals may include: alkali metals (e.g., lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), etc.); alkaline earth metals (e.g., beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), etc.); transition metals (e.g., titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt. (Co, Rhodium (Rh), Iridium (Ir), Nickel (Ni), Palladium (Pd), Platinum (Pt), Copper (Cu), Silver (Ag), Gold (Au), etc.); Post-transition metals (e.g., Zinc (Zn), Indium (In), Tin (Sn), etc.); and Lanthanides (e.g., Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu), etc.).

[0168] Examples of metalloids may include silicon (Si), antimony (Sb), and tellurium (Te).

[0169] Examples of nonmetals may include oxygen (O) and halogens (e.g., F, Cl, Br, I, etc.).

[0170] Examples of compounds including elements EL1 and EL2 may include metal oxides, metal halides (e.g., metal fluorides, metal chlorides, metal bromides, metal iodides, etc.), quasi-metal halides (e.g., quasi-metal fluorides, quasi-metal chlorides, quasi-metal bromides, quasi-metal iodides, etc.), metal tellurides, or any combination thereof.

[0171] Examples of metal oxides may include tungsten oxides (e.g., WO, W2O3, WO2, WO3, W2O5, etc.), vanadium oxides (e.g., VO, V2O3, VO2, V2O5, etc.), molybdenum oxides (e.g., MoO, Mo2O3, MoO2, MoO3, Mo2O5, etc.) and rhenium oxides (e.g., ReO3, etc.).

[0172] Examples of metal halides may include alkali metal halides, alkaline earth metal halides, transition metal halides, post-transition metal halides, and lanthanide metal halides.

[0173] Examples of alkali metal halides may include LiF, NaF, KF, RbF, CsF, LiCl, NaCl, KCl, RbCl, CsCl, LiBr, NaBr, KBr, RbBr, CsBr, LiI, NaI, KI, RbI, and CsI.

[0174] Examples of alkaline earth metal halides may include BeF2, MgF2, CaF2, SrF2, BaF2, BeCl2, MgCl2, CaCl2, SrCl2, BaCl2, BeBr2, MgBr2, CaBr2, SrBr2, BaBr2, BeI2, MgI2, CaI2, SrI2, and BaI2.

[0175] Examples of transition metal halides may include titanium halides (e.g., TiF4, TiCl4, TiBr4, TiI4, etc.), zirconium halides (e.g., ZrF4, ZrCl4, ZrBr4, ZrI4, etc.), hafnium halides (e.g., HfF4, HfCl4, HfBr4, HfI4, etc.), vanadium halides (e.g., VF3, VCl3, VBr3, VI3, etc.), niobium halides (e.g., NbF3, NbCl3, NbBr3, NbI3, etc.), and tantalum halides (e.g., TaF3, TaCl3, Ta...). Br3, TaI3, etc.), chromium halides (e.g., CrF3, CrCl3, CrBr3, CrI3, etc.), molybdenum halides (e.g., MoF3, MoCl3, MoBr3, MoI3, etc.), tungsten halides (e.g., WF3, WCl3, WBr3, WI3, etc.), manganese halides (e.g., MnF2, MnCl2, MnBr2, MnI2, etc.), technetium halides (e.g., TcF2, TcCl2, TcBr2, TcI2, etc.), rhenium halides (e.g., ReF2, ReCl2, ReBr2). Ferrous halides (e.g., FeF2, FeCl2, FeBr2, FeI2), ruthenium halides (e.g., RuF2, RuCl2, RuBr2, RuI2), osmium halides (e.g., OsF2, OsCl2, OsBr2, OsI2), cobalt halides (e.g., CoF2, CoCl2, CoBr2, CoI2), rhodium halides (e.g., RhF2, RhCl2, RhBr2, RhI2), iridium halides (e.g., IrF2, IrCl2, IrB2). (e.g., r2, IrI2, etc.) nickel halides (e.g., NiF2, NiCl2, NiBr2, NiI2, etc.), palladium halides (e.g., PdF2, PdCl2, PdBr2, PdI2, etc.), platinum halides (e.g., PtF2, PtCl2, PtBr2, PtI2, etc.), cuprous halides (e.g., CuF, CuCl, CuBr, CuI, etc.), silver halides (e.g., AgF, AgCl, AgBr, AgI, etc.) and gold halides (e.g., AuF, AuCl, AuBr, AuI, etc.).

[0176] Examples of post-transition metal halides may include zinc halides (e.g., ZnF2, ZnCl2, ZnBr2, ZnI2, etc.), indium halides (e.g., InI3, etc.) and tin halides (e.g., SnI2, etc.).

[0177] Examples of lanthanide metal halides may include YbF, YbF2, YbF3, SmF3, YbCl, YbCl2, YbCl3, SmCl3, YbBr, YbBr2, YbBr3, SmBr3, YbI, YbI2, YbI3, and SmI3.

[0178] Examples of quasi-metal halides may include antimony halides (e.g., SbCl5, etc.).

[0179] Examples of metal tellurides may include alkali metal tellurides (e.g., Li₂Te, Na₂Te, K₂Te, Rb₂Te, Cs₂Te, etc.), alkaline earth metal tellurides (e.g., BeTe, MgTe, CaTe, SrTe, BaTe, etc.), and transition metal tellurides (e.g., TiTe₂, ZrTe₂, HfTe₂, V₂Te₃, Nb₂Te₃, Ta₂Te₃, Cr₂Te₃, Mo₂Te₃, W₂Te₃, MnTe, TcTe, ReTe, F₂Te, etc.). (eTe, RuTe, OsTe, CoTe, RhTe, IrTe, NiTe, PdTe, PtTe, Cu2Te, CuTe, Ag2Te, AgTe, Au2Te, etc.), post-transition metal tellurides (e.g., ZnTe, etc.) and lanthanide metal tellurides (e.g., LaTe, CeTe, PrTe, NdTe, PmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, etc.).

[0180] [Emitting layer in interlayer 130]

[0181] When the light-emitting device 10 is a full-color light-emitting device, the emission layer can be patterned into a red emission layer, a green emission layer, and / or a blue emission layer according to the sub-pixels. In an embodiment, the emission layer may have a stacked structure of two or more layers selected from red, green, and blue emission layers, wherein the two or more layers may be in contact with each other or may be separated from each other to emit white light. In an embodiment, the emission layer may include two or more materials selected from red, green, and blue light-emitting materials, wherein the two or more materials may be mixed with each other in a single layer to emit white light.

[0182] The emitting layer may include a host, a first dopant, and a second dopant. The first and second dopant may each independently include a phosphorescent dopant, a delayed fluorescence dopant, or any combination thereof.

[0183] Based on a 100 wt% emitter layer, the amount of dopant in the emitter layer can range from about 0.01 wt% to about 25 wt%.

[0184] For example, based on a 100 wt% emitter layer, the total amount of the first dopant and the second dopant in the emitter layer can be from about 0.01 wt% to about 25 wt%.

[0185] In one embodiment, the emission layer may include a delayed fluorescence material. The delayed fluorescence material may be used as a host or dopant in the emission layer.

[0186] The thickness of the emission layer can be approximately to approximately Within a certain range. For example, the thickness of the emission layer can be approximately... to approximately Within the aforementioned range, excellent light-emitting properties can be obtained without significantly increasing the driving voltage when the thickness of the emitting layer is within any of the above range.

[0187] The individual amounts of each of the first and second dopant are as described above.

[0188] [main body]

[0189] In the specification, the hole transporter may be a compound with strong hole properties. The statement "compound with strong hole properties" may refer to a compound that readily accepts holes, and the hole transporter may possess this property by including a hole receiving portion (also called a hole transport portion).

[0190] Examples of hole-receiving portions may include π-electron-rich heteroaromatic compounds (e.g., carbazole derivatives or indole derivatives) or aromatic amine compounds.

[0191] In the specification, the electron transporter may be a compound with strong electronic properties. The statement "a compound with strong electronic properties" may refer to a compound that readily accepts electrons, and the electron transporter may possess this property by including an electron receiving portion (also called an electron transport portion).

[0192] Examples of electron-receiving portions may include heteroaromatic compounds lacking π electrons. For instance, electron-receiving portions may include nitrogen-containing heteroaromatic compounds.

[0193] In one embodiment, the main body of the emitting layer of the light-emitting device can be a single body or a bipolar body. In another embodiment, the main body can be a hybrid body including an electron transport body and a hole transport body.

[0194] When a compound includes only a hole transport component or only an electron transport component, it is obvious whether the compound has hole transport properties or electron transport properties.

[0195] A compound may include both hole-transporting and electron-transporting components. A simple comparison between the total number of hole-transporting components and the total number of electron-transporting components in a compound can be used as a criterion for predicting whether a compound is a hole-transporting or electron-transporting compound, but it is not an absolute criterion. One reason why this simple comparison is not an absolute criterion is that hole-transporting and electron-transporting components may not have exactly the same ability to attract holes and electrons, respectively.

[0196] Therefore, a relatively reliable method to determine whether a compound with a specific structure is a hole transport compound or an electron transport compound is to implement the compound directly in the device.

[0197] In an implementation, the main component may include a compound represented by formula 301:

[0198] [Formula 301]

[0199] [Ar 301 ] xb11 -[(L 301 ) xb1 -R 301 ] xb21 .

[0200] In Equation 301,

[0201] Ar 301 and L 301 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0202] xb11 can be 1, 2, or 3.

[0203] xb1 can be an integer selected from 0 to 5.

[0204] R 301 It can be hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or with at least one R. 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -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 ) or -P(=O)(Q 301 (Q) 302 ),

[0205] xb21 can be an integer selected from 1 to 5, and

[0206] Q 301 To Q 303 Each can be independently identical to the description in reference Q1.

[0207] In the implementation, in formula 301, when xb11 is 2 or greater, two or more Ar 301 They can bond with each other via single bonds.

[0208] In an implementation, the hole transport agent may include a compound represented by Formula 301-1, a compound represented by Formula 301-2, or any combination thereof:

[0209] [Formula 301-1]

[0210]

[0211] [Formula 301-2]

[0212]

[0213] In Equations 301-1 and 301-2,

[0214] Ring A 301 To Ring A 304 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0215] X 301 It can be O, S, N[(L 304 ) xb4 -R 304 ]、C(R 304 (R) 305 ) or Si(R 304 (R) 305 ),

[0216] xb22 and xb23 can each be 0, 1, or 2 independently.

[0217] L 301 To L 304 Each can be independently unsubstituted or by at least one R10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0218] R 301 To R 305 and R 311 To R 314 Each can be independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R. 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -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 ) or -P(=O)(Q 301 (Q) 302 ),and

[0219] xb1 to xb4 can each be an integer selected from 0 to 5 independently.

[0220] The following will describe R in detail. 10a and Q 301 To Q 303 .

[0221] In an implementation, the electron transport host may include a compound represented by Formula 1:

[0222] [Formula 1]

[0223]

[0224] In Equation 1,

[0225] Rings Ar3 to Ar5 can each be independently C5-C 60 Carbocyclic or C1-C 60 Heterocyclic group,

[0226] E can be N or C(R”6), F can be N or C(R”7), and G can be N or C(R”8).

[0227] At least one of E, F, and G can be N.

[0228] R”3 to R”8 can each be independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkenyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkenyl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryloxy, unsubstituted, or with at least one R 10a Replacement C6-C 60 Aryl thiols, unsubstituted or with at least one R 10a Replacement C1-C 60 heteroaryl, unsubstituted or with at least one R 10a Replacement C8-C 60 Monovalent non-aromatic fused polycyclic groups, unsubstituted or with at least one R 10a Replacement C1-C 60Monovalent non-aromatic fused heterocyclic groups, -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),

[0229] b”3 to b”5 can each be an integer selected from 1 to 5 independently.

[0230] When b”3 is 2 or greater, multiple R”3s can be the same or different from each other; when b”4 is 2 or greater, multiple R”4s can be the same or different from each other; and when b”5 is 2 or greater, multiple R”5s can be the same or different from each other.

[0231] Two adjacent substituents in R”3 to R”8 may optionally be bonded to each other to form an unsubstituted or substituted form with at least one R 10a Replacement C5-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group.

[0232] The following will describe R in detail. 10a And Q1 to Q3.

[0233] In some embodiments, the host may include an alkaline earth metal complex. In others, the host may include a Be complex (e.g., compound H55), a Mg complex, a Zn complex, or any combination thereof.

[0234] In embodiments, the main body may include one of compounds H1 to H124, one of compounds HT-01 to HT-17, one of compounds ET-01 to ET-015, 9,10-bis(2-naphthyl)anthracene (ADN), 2-methyl-9,10-bis(naphthyl-2-yl)anthracene (MADN), 9,10-bis(2-naphthyl)-2-tert-butyl-anthracene (TBADN), 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP), 1,3-bis(9-carbazolyl)benzene (mCP), 1,3,5-tris(carbazolyl-9-yl)benzene (TCP), or any combination thereof:

[0235]

[0236]

[0237]

[0238]

[0239]

[0240]

[0241]

[0242]

[0243]

[0244]

[0245] [Phosphorescent dopant]

[0246] Phosphorescent dopants may include at least one transition metal as the center metal.

[0247] Phosphorescent dopants may include monodentate ligands, dipentate ligands, tridentate ligands, tetradentate ligands, pentadentate ligands, hexadentate ligands, or any combination thereof.

[0248] Phosphorescent dopants can be electrically neutral.

[0249] In an embodiment, the first dopant may include an organometallic compound represented by formula 401 as a phosphorescent dopant:

[0250] [Formula 401]

[0251] M(L 401 ) xc1 (L 402 ) xc2 ,

[0252] [Formula 402]

[0253]

[0254] In Equations 401 and 402,

[0255] M can be a transition metal (e.g., iridium (Ir), platinum (Pt), palladium (Pd), osmium (Os), titanium (Ti), gold (Au), hafnium (Hf), europium (Eu), terbium (Tb), rhodium (Rh), rhenium (Re), or thulium (Tm)).

[0256] L 401 The ligand can be represented by Equation 402, and xc1 can be 1, 2, or 3, wherein when xc1 is 2 or greater, two or more L... 401 They can be the same or different from each other.

[0257] L 402It can be an organic ligand, and xc2 can be 0, 1, 2, 3, or 4, wherein when xc2 is 2 or greater, two or more L... 402 They can be the same or different from each other.

[0258] X 401 and X 402 They can be nitrogen or carbon independently.

[0259] Ring A 401 And Ring A 402 Each can be independently C3-C 60 Carbocyclic or C1-C 60 Heterocyclic group,

[0260] T 401 It can be a single bond, -O-, -S-, -C(=O)-, -N(Q)-. 411 )-、-C(Q 411 (Q) 412 )-、-C(Q 411 )=C(Q 412 )-、-C(Q 411 = or = C =,

[0261] X 403 and X 404 Each can be an independent chemical bond (e.g., covalent or coordinate), O, S, N (Q) 413 ), B(Q) 413 ), P(Q 413 ), C(Q 413 (Q) 414 ) or Si(Q 413 (Q) 414 ),

[0262] Q 411 To Q 414 Each can be independently identical to the description in reference Q1.

[0263] R 401 and R 402 Each can be independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R. 10a Replacement C1-C 20 Alkyl, unsubstituted, or with at least one R 10a Replacement C1-C 20 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -Si(Q) 401 (Q)402 (Q) 403 -N(Q) 401 (Q) 402 -B(Q) 401 (Q) 402 -C(=O)(Q) 401 -S(=O)2(Q) 401 ) or -P(=O)(Q 401 (Q) 402 ),

[0264] Q 401 To Q 403 Each can be independently identical to the description in reference Q1.

[0265] xc11 and xc12 can each be an integer selected from 0 to 10 independently, and

[0266] In Equation 402, * and *' each indicate the binding site with M in Equation 401.

[0267] The following will describe R in detail. 10a .

[0268] In the implementation, in formula 402, X 401 It can be nitrogen, and X 402 It can be carbon, or X 401 and X 402 Each can be nitrogen.

[0269] In the implementation, in formula 401, when xc1 is 2 or greater, two or more L 401 The two rings A in 401 Optionally via T as a linking group 402 Bonded to each other, or two rings A 402 Optionally via T as a linking group 403 They are bonded to each other (see compounds PD1 through PD4 and PD7). T 402 and T 403 Each can be independently compared with reference T 401 The descriptions are the same.

[0270] In Equation 401, L 402 It can be an organic ligand. In the embodiment, L 402 It may include halogen groups, diketone groups (e.g., acetylacetone groups), carboxylic acid groups (e.g., pyridine carboxyl groups), -C (=O), isonitrile groups, -CN groups, phosphorus-containing groups (e.g., phosphin groups, phosphite groups, etc.) or any combination thereof.

[0271] In the ligands of organometallic compounds represented by formula 401, adjacent substituents may optionally bond together to form a ring.

[0272] In this embodiment, the phosphorescent dopant may include, for example, one of compounds PD1 to PD39, one of compounds 1 to 120, or any combination thereof:

[0273]

[0274]

[0275]

[0276]

[0277]

[0278]

[0279]

[0280] [Delayed fluorescence materials]

[0281] The emission layer may include a delayed fluorescence material.

[0282] In the specification, the delayed fluorescence material can be any compound capable of emitting delayed fluorescence based on the delayed fluorescence emission mechanism.

[0283] Depending on the type of other materials included in the emission layer, the delayed fluorescence material included in the emission layer can be used as a host or as a dopant.

[0284] In this embodiment, the absolute value of the difference between the triplet energy level (eV) and the singlet energy level (eV) of the delayed fluorescent material can be at least about 0 eV and no greater than about 0.5 eV. When the absolute value of the difference between the triplet energy level (eV) and the singlet energy level (eV) of the delayed fluorescent material satisfies the above range, the upconversion from the triplet state to the singlet state of the delayed fluorescent material can occur effectively, and therefore, the luminous efficiency of the light-emitting device 10 can be improved.

[0285] In embodiments, delayed fluorescence materials may include: materials comprising at least one electron donor (e.g., π-electron-rich C3-C). 60 Cyclic groups (e.g., carbazole groups) and at least one electron acceptor (e.g., sulfoxide groups, cyano groups, and nitrogen-containing C1-C groups lacking π electrons). 60 Materials containing cyclic groups, etc.; or including C8-C 60 Polycyclic aromatic compounds, C8-C 60 Polycyclic groups include at least two cyclic groups that are fused together while sharing boron (B).

[0286] In an embodiment, the second dopant may include a compound represented by Formula 2 as a delayed fluorescence material:

[0287] [Equation 2]

[0288]

[0289] In Equation 2,

[0290] Y1 to Y3 can each be independently represented as O, S, N(R) 24 ), B(R) 24 ), C(R 24 (R) 25 ) or Si(R 24 (R) 25 ),

[0291] c can be 0 or 1.

[0292] A 11 To A 13 Each can be independently classified as C5-C 30 Carbocyclic or C1-C 30 Heterocyclic group,

[0293] R 21 To R 25 Each group can be independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, amino, amido, hydrazine, hydrazone, carboxylic acid or its salt, sulfonic acid or its salt, phosphate or its salt, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkenyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkenyl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryl, unsubstituted, or with at least one R 10a Replacement C6-C60 aryloxy, unsubstituted, or with at least one R 10a Replacement C6-C 60 Aryl thiols, unsubstituted or with at least one R 10a Replacement C1-C 60 heteroaryl, unsubstituted or with at least one R 10a Replacement C8-C 60 Monovalent non-aromatic fused polycyclic groups, unsubstituted or with at least one R 10a Replacement C1-C 60 Monovalent non-aromatic fused heterocyclic groups, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -P(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1) or -P(=O)(Q1)(Q2),

[0294] R 21 To R 25 They may optionally bond to each other to form unsubstituted or by at least one R 10a Replacement C5-C 30 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 30 Heterocyclic group,

[0295] a21 to a23 can each be an integer selected from 0 to 10 independently.

[0296] R 10a Possible forms:

[0297] Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro;

[0298] Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 Heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q)12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof;

[0299] Each of the unsubstituted or substituted C3-Cs as described below 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 Heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or

[0300] -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

[0301] Q1 to Q3, Q 11To Q 13 Q 21 To Q 23 and Q 31 To Q 33 Each can be independently represented as: hydrogen; deuterium; -F; -Cl; -Br; -I; hydroxyl; cyano; nitro; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 Alkoxy groups; or each of the following unsubstituted or deuterated, -F, cyano, C1-C 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 Carbocyclic group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

[0302] In this embodiment, the delayed fluorescence material may include at least one of compounds DF1 to D7, compound DF9, and compounds D-01 to D-52:

[0303]

[0304]

[0305]

[0306]

[0307]

[0308] [Electron transport region in interlayer 130]

[0309] The electron transport region may have a single-layer structure consisting of a single layer (composed of a single material), a single-layer structure consisting of a single layer comprising different materials, or a multi-layer structure comprising multiple layers containing different materials.

[0310] The electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

[0311] In an implementation, the electron transport region may have an electron transport layer / electron injection layer structure or a hole blocking layer / electron transport layer / electron injection layer structure, wherein the layers of each structure may be stacked from the emitter layer in the order described herein, but the structure of the electron transport region is not limited thereto.

[0312] In an implementation, the electron transport region may have a structure as a single layer of hole blocking layer / electron transport layer / electron injection layer, or a structure of a second hole blocking layer / first hole blocking layer / electron transport layer / electron injection layer, wherein the layers of each structure may be stacked from the emitter layer in the order described herein.

[0313] In this embodiment, when the hole blocking layer is a single layer, the electron mobility of the hole blocking layer can be approximately 1.0E-0.8 cm⁻¹. 2 / Vs to approximately 5.0E-06cm 2 Within the range of / Vs.

[0314] In one embodiment, when the hole blocking layer includes a first hole blocking layer and a second hole blocking layer, the electron mobility of the first hole blocking layer can be approximately 1.0E-0.8 cm⁻¹. 2 / Vs to approximately 5.0E-06cm 2 Within the range of / Vs.

[0315] Regarding the light-emitting device according to the embodiment, there is no limitation on the specific structure of the compound, as long as the electron mobility of the hole blocking layer and the energy level relationship between the layers of the interlayer 130 satisfy the conditions described above.

[0316] Regarding the electron mobility of the hole blocking layer

[0317] When the hole-blocking layer comprises only a single compound, the electron mobility of the hole-blocking layer can be equal to the electron mobility of a hole-blocking layer composed of only a single compound.

[0318] In cases where the hole blocking layer comprises a mixed compound, the electron mobility of the hole blocking layer can be the electron mobility of the hole blocking layer composed of the mixed compound.

[0319] The electron transport region (e.g., a hole-blocking layer or electron transport layer within the electron transport region) may include a metal-free compound comprising at least one π-electron-deficient nitrogen-containing C1-C. 60 Cyclic groups.

[0320] In an embodiment, the electron transport region may include a compound represented by Formula 601.

[0321] [Formula 601]

[0322] [Ar 601 ] xe11 -[(L 601 ) xe1 -R 601 ] xe21

[0323] In Equation 601,

[0324] Ar 601 and L 601 Each can be independently unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group,

[0325] xe11 can be 1, 2, or 3.

[0326] xe1 can be 0, 1, 2, 3, 4, or 5.

[0327] R 601 It can be unsubstituted or by at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -Si(Q) 601 (Q) 602 (Q) 603 -C(=O)(Q) 601 -S(=O)2(Q) 601 ) or -P(=O)(Q 601 (Q) 602 ),

[0328] Q 601 To Q 603 Each can be independently identical to the description in reference Q1.

[0329] xe21 can be 1, 2, 3, 4, or 5, and

[0330] Ar 601 L 601 and R 601 At least one of them can be independently unsubstituted or by at least one R. 10a Substituted π-electron-deficient nitrogen-containing C1-C 60 Cyclic groups.

[0331] In an implementation, in formula 601, when xe11 is 2 or greater, two or more Ar 601 They can be bonded together via single bonds.

[0332] In the implementation, in formula 601, Ar 601 It can be unsubstituted or by at least one R 10a Substituted anthracene group.

[0333] In an embodiment, the electron transport region may include a compound represented by formula 601-1:

[0334] [Formula 601-1]

[0335]

[0336] In Equation 601-1,

[0337] X 614 It can be N or C(R) 614 ), X 615 It can be N or C(R) 615 ), X 616 It can be N or C(R) 616 ), and X 614 To X 616 At least one of them can be N,

[0338] L 611 To L 613 Each can be independently compared with reference L 601 The descriptions are the same.

[0339] xe611 to xe613 can each be independently identical to the description in reference xe1.

[0340] R 611 To R 613 Each can be independently compared with reference R. 601 The descriptions are the same, and

[0341] R 614 To R 616 Each can be independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 20 Alkyl, C1-C 20 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group.

[0342] In the implementation, in formulas 601 and 601-1, xe1 and xe611 to xe613 can each be 0, 1 or 2 independently.

[0343] In embodiments, the electron transport region may include one of compounds ET1 to ET45, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, TAZ, NTAZ, compound 3, compound 4, compound 5, or any combination thereof:

[0344]

[0345]

[0346]

[0347]

[0348] The thickness of the electron transport region can be approximately to approximately Within a certain range. For example, the thickness of the electron transport region can be approximately... to approximately Within a certain range. The thickness of the electron transport layer can be approximately... to approximately Within a certain range. For example, the thickness of the electron transport layer can be approximately... to approximately Within the range.

[0349] The thickness of the hole-blocking layer can be approximately to approximately Within a certain range. For example, the thickness of the hole-blocking layer can be approximately... to approximately Within the range. When the hole blocking layer includes a first hole blocking layer and a second hole blocking layer, the thickness of the first hole blocking layer and the thickness of the second hole blocking layer can each independently be within approximately... to approximately Within a certain range. For example, the thickness of the first hole-blocking layer and the thickness of the second hole-blocking layer can each be independently within approximately [a certain range]. to approximately Within the range.

[0350] When the thickness of the hole blocking layer, electron transport layer and / or electron transport region is within the ranges described above, satisfactory electron transport characteristics can be obtained without significantly increasing the driving voltage.

[0351] In addition to the materials mentioned above, the electron transport region (e.g., the electron transport layer in the electron transport region) may further include a metallic material.

[0352] Metal-containing materials may include alkali metal complexes, alkaline earth metal complexes, or any combination thereof. The metal ion in an alkali metal complex may be Li, Na, K, Rb, or Cs ions, and the metal ion in an alkaline earth metal complex may be Be, Mg, Ca, Sr, or Ba ions. Ligands coordinated with the metal ions of the alkali metal complex or the alkaline earth metal complex may include hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyloxazole, hydroxyphenylthiazole, hydroxyphenyloxadiazole, hydroxyphenylthiadiazole, hydroxyphenylpyridine, hydroxyphenylbenzimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthrene, cyclopentadiene, or any combination thereof.

[0353] In this embodiment, the metal-containing material may include a Li complex. The Li complex may include, for example, compound ET-D1 (Liq) or compound ET-D2:

[0354]

[0355] The electron transport region may include an electron injection layer that facilitates the injection of electrons from the second electrode 150. The electron injection layer may be in direct contact with the second electrode 150.

[0356] The electron injection layer can have a single-layer structure consisting of a single layer (composed of a single material), a single-layer structure consisting of a single layer comprising different materials, or a multi-layer structure comprising multiple layers containing different materials.

[0357] The electron injection layer may include alkali metals, alkaline earth metals, rare earth metals, alkali metal compounds, alkaline earth metal compounds, rare earth metal compounds, alkali metal complexes, alkaline earth metal complexes, rare earth metal complexes, or any combination thereof.

[0358] Alkali metals may include Li, Na, K, Rb, Cs, or any combination thereof. Alkali earth metals may include Mg, Ca, Sr, Ba, or any combination thereof. Rare earth metals may include Sc, Y, Ce, Tb, Yb, Gd, or any combination thereof.

[0359] Alkali metal compounds, alkaline earth metal compounds, and rare earth metal compounds may include oxides, halides (e.g., fluorides, chlorides, bromides, iodides, etc.) or tellurides of alkali metals, alkaline earth metals, and rare earth metals, or any combination thereof.

[0360] Alkali metal compounds may include: alkali metal oxides, such as Li₂O, Cs₂O, or K₂O; alkali metal halides, such as LiF, NaF, CsF, KF, LiI, NaI, CsI, or KI; or any combination thereof. Alkali earth metal compounds may include alkaline earth metal oxides, such as BaO, SrO, CaO, Ba xSr 1-x O (where x is a real number satisfying 0 < x < 1) or Ba x Ca 1-x O (where x is a real number satisfying 0 < x < 1). The rare earth metal compound may include YbF3, ScF3, Sc2O3, Y2O3, Ce2O3, GdF3, TbF3, YbI3, ScI3, TbI3, or any combination thereof. In an embodiment, the rare earth metal compound may include lanthanide metal tellurides. Examples of lanthanide metal tellurides may include LaTe, CeTe, PrTe, NdTe, PmTe, SmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, La2Te3, Ce2Te3, Pr2Te3, Nd2Te3, Pm2Te3, Sm2Te3, Eu2Te3, Gd2Te3, Tb2Te3, Dy2Te3, Ho2Te3, Er2Te3, Tm2Te3, Yb2Te3, and Lu2Te3.

[0361] The alkali metal complex, alkaline earth metal complex, and rare earth metal complex may include: an alkali metal ion, an alkaline earth metal ion, or a rare earth metal ion; and a ligand bonded to the metal ion (e.g., hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyl oxazole, hydroxyphenyl thiazole, hydroxyphenyl oxadiazole, hydroxyphenyl thiadiazole, hydroxyphenyl pyridine, hydroxyphenyl benzimidazole, hydroxyphenyl benzothiazole, bipyridine, phenanthroline, cyclopentadiene, or any combination thereof).

[0362] In an embodiment, the electron injection layer may be composed of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal-containing compound, an alkaline earth metal-containing compound, a rare earth metal-containing compound, an alkali metal complex, an alkaline earth metal complex, a rare earth metal complex, or any combination thereof as described above. In an embodiment, the electron injection layer may further include an organic material (e.g., a compound represented by Formula 601).

[0363] In an embodiment, the electron injection layer may be composed of an alkali metal-containing compound (e.g., an alkali metal halide); or the electron injection layer may be composed of an alkali metal-containing compound (e.g., an alkali metal halide) and an alkali metal, an alkaline earth metal, a rare earth metal, or any combination thereof. In an embodiment, the electron injection layer may be a KI:Yb co-deposited layer, a RbI:Yb co-deposited layer, a LiF:Yb co-deposited layer, etc.

[0364] When the electron injection layer further includes an organic material, the alkali metal, alkaline earth metal, rare earth metal, alkali metal-containing compound, alkaline earth metal-containing compound, rare earth metal-containing compound, alkali metal complex, alkaline earth metal complex, rare earth metal complex, or any combination thereof may be uniformly or non-uniformly dispersed in a matrix including the organic material.

[0365] The thickness of the electron injection layer can be approximately to approximately Within a certain range. For example, the thickness of the electron-injected layer can be approximately... to approximately Within the range described above, satisfactory electron injection characteristics can be obtained without significantly increasing the driving voltage when the thickness of the electron injection layer is within any range as described above.

[0366] The material that may be included in the electron transport region may be included in the form of a single layer in the hole blocking layer and the first hole blocking layer.

[0367] [Second electrode 150]

[0368] The second electrode 150 may be disposed on the interlayer 130. The second electrode 150 may be a cathode serving as an electron injection electrode. When the second electrode 150 is a cathode, the second electrode 150 may comprise a material having a low work function (e.g., a metal, alloy, conductive compound, or any combination thereof).

[0369] The second electrode 150 may include lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), ytterbium (Yb), silver-ytterbium (Ag-Yb), ITO, IZO, or any combination thereof. The second electrode 150 may be a transmission electrode, a transmission-reflection electrode, or a reflection electrode.

[0370] The second electrode 150 may have a single-layer structure or a multi-layer structure.

[0371] [Capping layer]

[0372] The light-emitting device 10 may include a first capping layer disposed outside the first electrode 110 and / or a second capping layer disposed outside the second electrode 150. In an embodiment, the light-emitting device 10 may have a structure in which the first capping layer, the first electrode 110, the interlayer 130, and the second electrode 150 are stacked in the order described herein, or a structure in which the first capping layer, the first electrode 110, the interlayer 130, the second electrode 150, and the second capping layer are stacked in the order described herein, or a structure in which the first capping layer, the first electrode 110, the interlayer 130, the second electrode 150, and the second capping layer are stacked in the order described herein.

[0373] Light generated in the emitting layer of the interlayer 130 of the light-emitting device 10 can be extracted to the outside through a first electrode 110, which may be a reflective electrode or a transmissive electrode, and through a first capping layer. Light generated in the emitting layer of the interlayer 130 of the light-emitting device 10 can be extracted to the outside through a second electrode 150, which may be a reflective electrode or a transmissive electrode, and through a second capping layer.

[0374] The first and second capping layers can each increase the external emission efficiency based on the principle of constructive interference. Correspondingly, the light extraction efficiency of the light-emitting device 10 is increased, thereby increasing the luminous efficiency of the light-emitting device 10.

[0375] The first capping layer and the second capping layer may each comprise a material having a refractive index equal to or greater than about 1.6 (relative to a wavelength of about 589 nm).

[0376] The first capping layer and the second capping layer can each be an organic capping layer including organic materials, an inorganic capping layer including inorganic materials, or an organic-inorganic composite capping layer including both organic and inorganic materials.

[0377] At least one of the first and second capping layers may independently comprise a carbocyclic compound, a heterocyclic compound, an amino-containing compound, a porphyrin derivative, a phthalocyanine derivative, a naphthyl phthalocyanine derivative, an alkali metal complex, an alkaline earth metal complex, or any combination thereof. The carbocyclic compound, heterocyclic compound, and amino-containing compound may optionally be substituted with substituents including O, N, S, Se, Si, F, Cl, Br, I, or any combination thereof. In embodiments, at least one of the first and second capping layers may independently comprise an amino-containing compound.

[0378] In an embodiment, at least one of the first capping layer and the second capping layer may each independently comprise a compound represented by formula 201, a compound represented by formula 202, or any combination thereof.

[0379] In an embodiment, at least one of the first capping layer and the second capping layer may each independently comprise one of compounds HT28 to HT33, one of compounds CP1 to CP7, β-NPB, or any combination thereof:

[0380]

[0381] [Electronic Devices]

[0382] Light-emitting devices can be included in various electronic devices. For example, electronic devices that include light-emitting devices can be light-emitting devices or authentication devices, etc.

[0383] In addition to the light-emitting device, the electronic device (e.g., the light-emitting device) may further include: a color filter, a color conversion layer, or a color filter and a color conversion layer. The color filter and / or the color conversion layer may be arranged in at least one direction of travel of the light emitted from the light-emitting device. For example, the light emitted from the light-emitting device may be blue light. Further details regarding the light-emitting device may be the same as described herein. In embodiments, the color conversion layer may include quantum dots.

[0384] An electronic device may include a substrate. The substrate may include a plurality of sub-pixels, a color filter may include a plurality of color filter regions corresponding to the plurality of sub-pixels, and a color conversion layer may include a plurality of color conversion regions corresponding to the plurality of sub-pixels.

[0385] Pixel-defining films can be arranged between multiple subpixels to define each subpixel.

[0386] The color filter may further include a plurality of color filter regions and a plurality of light-blocking patterns arranged between the plurality of color filter regions, and the color conversion layer may further include a plurality of color conversion areas and a plurality of light-blocking patterns arranged between the plurality of color conversion areas.

[0387] Multiple color filter regions (or multiple color conversion regions) may include a first region emitting a first color light, a second region emitting a second color light, and / or a third region emitting a third color light, wherein the first color light, the second color light, and / or the third color light may have different maximum emission wavelengths. In an embodiment, the first color light may be red light, the second color light may be green light, and the third color light may be blue light. In an embodiment, the multiple color filter regions (or multiple color conversion regions) may include quantum dots. For example, the first region may include red quantum dots, the second region may include green quantum dots, and the third region may not include quantum dots. Further details regarding quantum dots may be the same as described herein. The first region, the second region, and / or the third region may each further include a scatterer.

[0388] In one embodiment, the light-emitting device can emit first light, a first region can absorb the first light to emit first-first-color light, a second region can absorb the first light to emit second-first-color light, and a third region can absorb the first light to emit third-first-color light. The first-first-color light, the second-first-color light, and the third-first-color light can have different maximum emission wavelengths. For example, the first light can be blue light, the first-first-color light can be red light, the second-first-color light can be green light, and the third-first-color light can be blue light.

[0389] In addition to the light-emitting device as described above, the electronic device may further include a thin-film transistor. The thin-film transistor may include a source electrode, a drain electrode, and an active layer, wherein either the source electrode or the drain electrode may be electrically connected to either the first electrode or the second electrode of the light-emitting device.

[0390] Thin-film transistors may further include gate electrodes or gate insulating films, etc.

[0391] The active layer may include crystalline silicon, amorphous silicon, organic semiconductors, or oxide semiconductors, etc.

[0392] The electronic device may further include a sealing portion for sealing the light-emitting device. The sealing portion may be disposed between the color filter and / or color conversion layer and the light-emitting device. The sealing portion allows light from the light-emitting device to be extracted to the outside while simultaneously preventing ambient air and moisture from penetrating into the light-emitting device. The sealing portion may be a sealing substrate comprising a transparent glass substrate or a plastic substrate. The sealing portion may be a thin-film encapsulation layer comprising at least one of an organic layer and an inorganic layer. When the sealing portion is a thin-film encapsulation layer, the electronic device may be flexible.

[0393] In addition to color filters and / or color conversion layers, various functional layers may be further included on the sealed portion, depending on the intended use of the electronic device. Examples of functional layers may include a touchscreen layer and a polarizing layer. The touchscreen layer may be a pressure-sensitive touchscreen layer, a capacitive touchscreen layer, or an infrared touchscreen layer. The authentication device may be, for example, a biometric authentication device that authenticates an individual using biometric information from a living body (e.g., fingertip, pupil, etc.).

[0394] In addition to the light-emitting device described above, the authentication device may further include a biometric information collector.

[0395] Electronic devices can be applied to a variety of displays, light sources, lighting equipment, personal computers (e.g., mobile personal computers), mobile phones, digital cameras, electronic notebooks, electronic dictionaries, video game consoles, medical tools (e.g., electronic thermometers, blood pressure monitors, blood glucose meters, pulse measuring devices, pulse wave measuring devices, electrocardiogram displays, ultrasound diagnostic devices, or endoscopic displays), fish finders, various measuring tools, instrumentation equipment (e.g., instruments for vehicles, aircraft, and ships), and projectors, etc.

[0396] [ Figure 2 and Figure 3 [Description]

[0397] Figure 2 This is a schematic cross-sectional view of an electronic device according to an embodiment.

[0398] Figure 2 The electronic device includes a substrate 100, a thin-film transistor (TFT), a light-emitting device, and a sealing portion 300 that seals the light-emitting device.

[0399] The substrate 100 may be a flexible substrate, a glass substrate, or a metal substrate. A buffer layer 210 may be disposed on the substrate 100. The buffer layer 210 can prevent the penetration of impurities through the substrate 100 and can provide a flat surface on the substrate 100.

[0400] The TFT can be disposed on the buffer layer 210. The TFT may include an active layer 220, a gate electrode 240, a source electrode 260, and a drain electrode 270.

[0401] The active layer 220 may include inorganic semiconductors (e.g., silicon or polysilicon), organic semiconductors or oxide semiconductors, and the active layer 220 may include a source region, a drain region and a channel region.

[0402] A gate insulating film 230 for insulating the active layer 220 from the gate electrode 240 may be disposed on the active layer 220, and the gate electrode 240 may be disposed on the gate insulating film 230.

[0403] The interlayer insulating film 250 may be disposed on the gate electrode 240. The interlayer insulating film 250 may be disposed between the gate electrode 240 and the source electrode 260 to insulate the gate electrode 240 and the source electrode 260 from each other, and may also be disposed between the gate electrode 240 and the drain electrode 270 to insulate the gate electrode 240 and the drain electrode 270 from each other.

[0404] The source electrode 260 and the drain electrode 270 may be arranged on the interlayer insulating film 250. The interlayer insulating film 250 and the gate insulating film 230 may be formed to expose the source region and drain region of the active layer 220, and the source electrode 260 and the drain electrode 270 may respectively contact the exposed portions of the source region and drain region of the active layer 220.

[0405] The TFT can be electrically connected to a light-emitting device to drive the light-emitting device, and can be covered and protected by a passivation layer 280. The passivation layer 280 may include an inorganic insulating film, an organic insulating film, or any combination thereof. The light-emitting device may be provided on the passivation layer 280. The light-emitting device may include a first electrode 110, a sandwich layer 130, and a second electrode 150.

[0406] The first electrode 110 may be disposed on the passivation layer 280. The passivation layer 280 may not completely cover the drain electrode 270 and may expose a portion of the drain electrode 270. The first electrode 110 may be connected (e.g., electrically connected) to the exposed portion of the drain electrode 270.

[0407] A pixel defining film 290, including insulating material, may be disposed on the first electrode 110. The pixel defining film 290 may expose an area of ​​the first electrode 110, and an interlayer 130 may be formed in the exposed area of ​​the first electrode 110. The pixel defining film 290 may be a polyimide-based organic film or a polyacrylic acid-based organic film. Although not explicitly stated... Figure 2 As shown, however, at least some layers of the interlayer 130 may extend beyond the upper portion of the pixel-defining film 290 and be provided as a common layer.

[0408] The second electrode 150 may be disposed on the interlayer 130, and the capping layer 170 may be further included on the second electrode 150. The capping layer 170 may be formed to cover the second electrode 150.

[0409] The sealing portion 300 may be located on the capping layer 170. The sealing portion 300 may be disposed on the light-emitting device to protect it from moisture and / or oxygen. The sealing portion 300 may include an inorganic film, including silicon nitride (SiN). x ), silicon oxide (SiO) x Indium tin oxide, indium zinc oxide, or any combination thereof; organic membranes, including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resins (e.g., polymethyl methacrylate or polyacrylic acid), epoxy resins (e.g., aliphatic glycidyl ether (AGE)), or any combination thereof; or any combination of inorganic and organic membranes.

[0410] Figure 3 This is a schematic cross-sectional view of an electronic device according to another embodiment.

[0411] Figure 3 electronic devices and Figure 2 The difference in the electronic device may lie at least in that the light-shielding pattern 500 and the functional area 400 are further included on the sealing portion 300. The functional area 400 may be a color filter area, a color conversion area, or a combination of a color filter area and a color conversion area. In an embodiment, Figure 3 The light-emitting device included in the electronic device may be a series light-emitting device.

[0412] [Manufacturing Method]

[0413] The layers constituting the hole transport region, the emission layer, and the electron transport region can be formed in selected regions using various methods (e.g., vacuum deposition, spin coating, casting, Langmuir-Brookett (LB) deposition, inkjet printing, laser printing, and laser-induced thermal imaging).

[0414] When forming layers constituting hole transport regions, emission regions, and electron transport regions by vacuum deposition, the deposition temperature can be in the range of about 100°C to about 500°C, depending on the materials included in the layers to be formed and the structure of the layers to be formed. -8 To about 10 -3 Under the vacuum level within the range of Tor and in approximately to approximately Deposition is carried out at deposition rates within a certain range.

[0415] When the layer constituting the hole transport region, the emitter layer, and the layer constituting the electron transport region are formed by spin coating, spin coating can be performed at a coating speed in the range of about 2,000 rpm to about 5,000 rpm and a heat treatment temperature in the range of about 80°C to about 200°C, taking into account the materials included in the layer to be formed and the structure of the layer to be formed.

[0416] [Terminology limitations]

[0417] As used in this article, the term "C3-C" 60 A "carbocyclic group" can be a cyclic group consisting of 3 to 60 carbon atoms, with carbon atoms as the sole cyclic atom. As used herein, the term "C1-C" is used in conjunction with "C1-C". 60 A "heterocyclic group" can be a cyclic group having 1 to 60 carbon atoms and further including at least one heteroatom as a cyclic atom in addition to carbon atoms. (C3-C) 60 Carbocyclic groups and C1-C 60 The heterocyclic group can be a monocyclic group consisting of a single ring or a polycyclic group in which two or more rings are fused together. In the embodiments, C1-C 60 The number of cyclic atoms in a heterocyclic group can be from 3 to 61.

[0418] As used herein, the term "cyclic group" may refer to C3-C 60 Carbocyclic or C1-C 60 Heterocyclic group.

[0419] As used in this article, the term "π-electron-rich C3-C" 60 A "cyclic group" can be a cyclic group having 3 to 60 carbon atoms and may not include *-N=*' as a cyclic moiety. As used herein, the term "π-electron-deficient nitrogen-containing C1-C" is used. 60 The "cyclic group" may be a heterocyclic group having 1 to 60 carbon atoms and may include *-N=*' as the cyclic part.

[0420] In the implementation,

[0421] C3-C 60 The carbocyclic group can be a T1 group or a group in which two or more T1 groups are fused together (e.g., cyclopentadienyl, adamantyl, norbornel, phenyl, pentaenyl, naphthyl, azuleyl, indarabenyl, acenaphthel, phenanthyl, anthraceneyl, fluoranyl, triphenylene, pyrene, 1,2-benzophenantyl, peryl, penfenyl, heptaenyl, tetraphenyl, framyl, hexaphenyl, pentaphenyl, rubiginyl, keratyl, ovoleyl, indyl, fluorenyl, spirodifluorenyl, benzofluorenyl, indophenantyl, or indoanthrayl).

[0422] C1-C 60The heterocyclic group can be a T2 group, a group in which two or more T2 groups are fused together, or a group in which at least one T2 group and at least one T1 group are fused together (e.g., pyrrole, thiophene, furanyl, indole, benzoindole, naphthoindole, isoindole, benzoisoindole, naphthoisoindole, benzothiophene, benzofuranyl, carbazole, dibenzothiophene, dibenzofuranyl, dibenzocarbazole, indocarbazole, indolecarbazole, benzofuranocarbazole, benzothiophenecarbazole, benzothiophenecarbazole, benzoindocarbazole, benzocarbazole, benzonaphthofuranyl, benzonaphthophene, benzonaphthothiophene, benzofuranodibenzofuranyl, benzofuranodibenzothiophene). Fenyl, benzothiophene, dibenzothiophene, pyrazolyl, imidazole, triazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiazolyl, benzopyrazolyl, benzimidazolyl, benzooxazolyl, benzoisooxazolyl, benzothiazolyl, benzoisothiazolyl, pyridyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, benzoquinoline Phinyl, benzoisoquinolinyl, quinoxalinyl, benzoquinoxalinyl, quinazolinyl, benzoquinazolinyl, phenanthrolinyl, cenolinyl, phthalazinyl, naphthidyl, imidazopyridyl, imidazopyrimidyl, imidazotriazinyl, imidazopyrazinyl, imidazopyridazinyl, azacarbazoyl, azafluorenyl, azadibenzothiophenyl, azadibenzofuranyl, etc.

[0423] C3-C rich in π electrons 60 The cyclic group may be a T1 group, a group in which two or more T1 groups are fused together, a T3 group, a group in which two or more T3 groups are fused together, or a group in which at least one T3 group and at least one T1 group are fused together (e.g., C3-C). 60 Carbocyclic, 1H-pyrrole, thiorrole, borocyclopentadienyl, 2H-pyrrole, 3H-pyrrole, thiophene, furanyl, indole, benzoindole, naphthoindole, isoindole, benzoisoindole, naphthoisoindole, benzothiorrole, benzothiophene, benzofuranyl, carbazole, dibenzothiorrole, dibenzothiophene, dibenzofuranyl, indole-carbazole, benzofuran-carbazole, benzothiophene-carbazole, benzothiorrole-carbazole, benzoindole-carbazole, benzocarbazole, benzonaphthofuranyl, benzonaphthophene, benzonaphthorrole, benzofuran-dibenzofuranyl, benzofuran-dibenzothiophene or benzothiophene-dibenzothiophene, etc.

[0424] Nitrogen-containing C1-C lacking π electrons 60The cyclic group may be a T4 group, a group in which two or more T4 groups are fused together, a group in which at least one T4 group and at least one T1 group are fused together, a group in which at least one T4 group and at least one T3 group are fused together, or a group in which at least one T4 group, at least one T1 group and at least one T3 group are fused together (e.g., pyrazolyl, imidazolyl, triazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiadiazolyl, benzopyrazolyl, benzimidazole, benzoxazole). The following groups are listed: benzo[a]oxazolyl, benzo[a]thiazolyl, benzo[a]isothiazolyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, benzo[a]quinolinyl, benzo[a]isoquinolinyl, quinoxalinyl, benzo[a]quinoxalinyl, quinazolinyl, benzo[a]quinazolinyl, phenanthrolinel, cinolinyl, phthalazinyl, naphridinyl, imidazo[a]pyridinyl, imidazo[a]pyrimidinyl, imidazo[a]triazinyl, imidazo[a]pyrazinyl, imidazo[a]pyridazinyl, imidazo[a]pyridazinyl, azacarbazolyl, azafluorenyl, azadibenzothiophene, azadibenzofuranyl, etc.

[0425] The T1 group can be cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclobutenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cyclohexadienyl, cycloheptenyl, adamantyl, norbornyl (or bicyclo[2.2.1]heptyl), norbornyl, bicyclo[1.1.1]pentane, bicyclo[2.1.1]hexane, bicyclo[2.2.2]octane, or phenyl.

[0426] The T2 group can be furanyl, thiophene, 1H-pyrrolyl, thiophene, borocyclopentadienyl, 2H-pyrrolyl, 3H-pyrrolyl, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiadiazolyl, azathiazolyl, azaboracyclopentadienyl, pyridinyl, pyrimidinyl, pyrazinyl, pyrazinyl, triazinyl, tetraazinyl, pyrrolylalkyl, imidazolyl, dihydropyrrolyl, piperidinyl, tetrahydropyridinyl, dihydropyridinyl, hexahydropyrimidinyl, tetrahydropyrimidinyl, dihydropyrimidinyl, piperazinyl, tetrahydropyrazinyl, dihydropyrazinyl, tetrahydropyrazinyl, or dihydropyrazinyl.

[0427] The T3 group can be furanyl, thiophene, 1H-pyrrole, thiophene, or borocyclopentadienyl, and

[0428] The T4 group can be 2H-pyrrole, 3H-pyrrole, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiazolyl, azirthiolyl, aziboranecyclopentadienyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, or tetraazinyl.

[0429] As used herein, the terms "cyclic group", "C3-C" 60 "Carbocyclic group", "C1-C" 60 Heterocyclic groups, π-electron-rich C3-C 60 "Cyclic groups" and "nitrogen-containing C1-C groups lacking π electrons" 60 "Cyclic group" can be any group fused with any cyclic group, monovalent group, or polyvalent group (e.g., divalent group, trivalent group, tetravalent group, etc.) according to the structure of the formula using the corresponding term. For example, "phenyl" can be benzo[a], phenyl, or phenylene, etc., which can be readily understood by those skilled in the art from the structure of formulas including "phenyl".

[0430] Unit price C3-C 60 Carbocyclic groups and monovalent C1-C 60 Examples of heterocyclic groups may include C3-C 10 cycloalkyl, C1-C 10 Heterocyclic alkyl, C3-C 10 Cycloalkenyl, C1-C 10 Heterocyclic alkenyl, C6-C 60 Aryl, C1-C 60 Heteroaryl groups, monovalent non-aromatic fused polycyclic groups, and monovalent non-aromatic fused heterocyclic groups. Divalent C3-C 60 Carbocyclic groups and divalent C1-C 60 Examples of heterocyclic groups may include C3-C 10 Cycloalkylene, C1-C 10 Heterocyclic alkyl, C3-C 10 Cycloalkylene, C1-C 10 Heterocyclic alkenyl, C6-C 60 aryl, C1-C 60 Hypoaryl, divalent non-aromatic fused polycyclic groups and divalent non-aromatic fused heterocyclic groups.

[0431] As used in this article, the term "C1-C" 60 "Alkyl" can be a straight-chain or branched monovalent aliphatic hydrocarbon group having 1 to 60 carbon atoms, and examples may include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, tert-pentyl, neopentyl, isopentyl, sec-pentyl, 3-pentyl, sec-isopentyl, n-hexyl, isohexyl, sec-hexyl, tert-hexyl, n-heptyl, isoheptyl, sec-heptyl, tert-heptyl, n-octyl, isooctyl, sec-octyl, tert-octyl, n-nonyl, isononyl, sec-nonyl, tert-nonyl, n-decyl, isodel, sec-decyl, and tert-decyl. As used herein, the term "C1-C" refers to... 60 "alkylene" can be C1-C 60 Alkyl groups have the same structure as divalent groups.

[0432] As used in this article, the term "C2-C" 60 "Alkenyl" can be in C2-C 60 The alkyl group has at least one carbon-carbon double bond at its middle or end, and examples may include vinyl, propenyl, and butenyl groups. As used herein, the term "C2-C" refers to... 60 "Alkenyl" can be C2-C 60 Alkenes are divalent groups with the same structure.

[0433] As used in this article, the term "C2-C" 60 "Alkyne group" can be at C2-C 60 The alkyl group has at least one monovalent hydrocarbon group with a carbon-carbon triple bond in the middle or at the end, and examples may include ethynyl and propynyl. As used herein, the term "C2-C" refers to... 60 "Isynyl group" can be related to C2-C 60 Alkynes are divalent groups with the same structure.

[0434] As used in this article, the term "C1-C" 60 "Alkoxy" can be composed of -O(A 101 (where A) 101 Can be C1-C 60 Alkyl groups are monovalent groups, and examples of them may include methoxy, ethoxy, and isopropoxy.

[0435] As used in this article, the term "C3-C" 10 "Cycloalkyl" can be a monocyclic cyclic group consisting of 3 to 10 carbon atoms in a monovalent saturated hydrocarbon. (C3-C) 10 Examples of cycloalkyl groups may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, norbornyl (bicyclo[2.2.1]heptyl), bicyclo[1.1.1]pentyl, bicyclo[2.1.1]hexyl, or bicyclo[2.2.2]octyl. As used herein, the term "C3-C" refers to... 10 "Cycloalkylene" can be C3-C 10 Cycloalkyl groups have the same divalent structure.

[0436] As used in this article, the term "C1-C" 10 "Heterocyclic alkyl" can be a monovalent cyclic group having 1 to 10 carbon atoms and further including at least one heteroatom as a cyclic atom in addition to the carbon atoms, and examples may include 1,2,3,4-oxatriazolyl, tetrahydrofuranyl, and tetrahydrothiopheneyl. As used herein, the term "C1-C" refers to... 10 "Heterocyclic alkyl" can be C1-C 10 Heterocyclic alkyl groups have the same divalent structure.

[0437] As used in this article, the term "C3-C" 10 "Cycloalkenyl" can be a monovalent cyclic group having 3 to 10 carbon atoms and at least one carbon-carbon double bond in its ring structure and being non-aromatic, and examples may include cyclopentenyl, cyclohexenyl, and cycloheptenyl. As used herein, the term "C3-C" refers to... 10 "Iridylene" can be related to C3-C 10 Cycloalkenyl groups are divalent groups with the same structure.

[0438] As used in this article, the term "C1-C" 10 "Heterocyclic alkenyl" can be a monovalent cyclic group having 1 to 10 carbon atoms in its ring structure, further including at least one heteroatom as a cyclic atom in addition to carbon atoms, and having at least one double bond. C1-C 10 Examples of heterocyclic alkenyl groups may include 4,5-dihydro-1,2,3,4-oxarizolyl, 2,3-dihydrofuranyl, and 2,3-dihydrothiophenyl. As used herein, the term "C1-C" refers to... 10 "Heterocyclic alkenyl" can be C1-C 10 Heterocyclic alkenyl groups are divalent groups with the same structure.

[0439] As used in this article, the term "C6-C" 60 "Aryl" can be a monovalent group in a carbocyclic aromatic system having 6 to 60 carbon atoms, and as used herein, the term "C6-C" refers to... 60 "Arylene" can be a divalent group in a carbocyclic aromatic system with 6 to 60 carbon atoms. (C6-C) 60 Examples of aryl groups may include phenyl, pentanenyl, naphthyl, azulel, indole, acenaphthel, phenanthyl, anthrayl, fluoranthyl, triphenylene, pyrene, 1,2-benzophenanthryl, perylene, pentanenyl, heptanenyl, tetraphenyl, framyl, hexaphenyl, pentaphenyl, rubiginyl, myristyl, and ovoleyl. When C6-C 60 Aryl and C6-C 60 When each of the aryl groups comprises two or more rings, the individual rings of the two or more rings can fused together.

[0440] As used in this article, the term "C1-C" 60 "Heteroaryl" can be a monovalent group having a heterocyclic aromatic system having 1 to 60 carbon atoms and further including at least one heteroatom as a cyclic atom in addition to carbon atoms. As used herein, the term "C1-C" is used in this context. 60 "Hypo-heteroaryl" can be a divalent group having a heterocyclic aromatic system having 1 to 60 carbon atoms and further including at least one heteroatom as a cyclic atom in addition to carbon atoms. C1-C 60Examples of heteroaryl groups may include pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, benzo[a]quinolinyl, isoquinolinyl, benzo[a]isoquinolinyl, quinoxalinyl, benzo[a]quinoxalinyl, quinazolinyl, benzo[a]quinazolinyl, cyclolinyl, phenanthrolinel, phthalazinyl, and naphthidyl. When C1-C 60 heteroaryl and C1-C 60 When each heteroaryl group comprises two or more rings, the individual rings of the two or more rings can fused together.

[0441] As used herein, the term "monovalent nonaromatic fused polycyclic group" can be a monovalent group having two or more rings fused together, with only carbon atoms (e.g., 8 to 60 carbon atoms) as cyclic atoms, and having no aromaticity in its molecular structure when considered as a whole. Examples of monovalent nonaromatic fused polycyclic groups can include indenyl, fluorenyl, spirodifluorenyl, benzo[a]fluorenyl, indeno[a]phenanthryl, and indeno[a]anthrayl. As used herein, the term "divalent nonaromatic fused polycyclic group" can be a divalent group having the same structure as a monovalent nonaromatic fused polycyclic group.

[0442] As used herein, the term “monovalent nonaromatic fused heterocyclic group” can be a monovalent group having two or more rings fused together, further including at least one heteroatom as a cyclic atom in addition to carbon atoms (e.g., 1 to 60 carbon atoms), and having no aromaticity in its molecular structure when considered as a whole. Examples of monovalent non-aromatic fused heterocyclic groups may include pyrrole, thiophene, furanyl, indole, benzoindole, naphthoindole, isoindole, benzoisoindole, naphthoisoindole, benzothiophene, benzofuranyl, carbazole, dibenzothiophene, dibenzofuranyl, azacarbazole, azafluorenyl, azadibenzothiophene, azadibenzothiophene, azadibenzofuranyl, pyrazolyl, imidazolyl, triazolyl, tetrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, isothiazolyl, oxadiazolyl, thiazolyl Benzopyrazolyl, benzoimidazolyl, benzooxazolyl, benzothiazolyl, benzooxadiazolyl, benzothiadiazolyl, imidazopyridyl, imidazopyrimidinyl, imidazotriazinyl, imidazopyrazinyl, imidazopyridazinyl, indolecarbazolyl, indolocarbazolyl, benzofuranocarbazolyl, benzothiophenocarbazolyl, benzothiophenocarbazolyl, benzoindolocarbazolyl, benzocarbazolyl, benzonaphthiophenyl, benzonaphthiophenyl, benzofuranodibenzofuranyl, benzofuranodibenzothiophenyl, and benzothiophenodibenzothiophenyl. As used herein, the term "divalent nonaromatic fused heteropolycyclic group" can refer to a divalent group having the same structure as a monovalent nonaromatic fused heteropolycyclic group.

[0443] As used in this article, the term "C6-C" 60"Aryloxy group" can be composed of -O(A 102 (where A) 102 It can be C6-C 60 The aryl group is used to indicate a group, and as used herein, the term "C6-C" is used to refer to a group. 60 "Arylthio" can be formed by -S(A 103 (where A) 103 It can be C6-C 60 (aryl) represents a group.

[0444] As used in this document, the term "C7-C" 60 "Aryl" can be composed of -(A 104 (A) 105 (where A) 104 Can be C1-C 54 Alkylene, and A 105 It can be C6-C 59 The aryl group is used to indicate a group, and as used herein, the term "C2-C" is used to refer to a group. 60 "Heteroarylene" can be composed of -(A 106 (A) 107 (where A) 106 Can be C1-C 59 Alkylene, and A 107 Can be C1-C 59 (Heteroaryl) represents a group.

[0445] As used in this article, the term "C3-C" 60 "Carbocyclic group" includes C3-C 50 carbonyl group, C3-C 40 carbonyl group, C3-C 30 carbonyl group, C3-C 20 carbonyl group or C3-C 10 carbon cyclo group;

[0446] The term "C1-C" 60 "Heterocyclic groups" include C1-C 50 Heterocyclic groups, C1-C 40 Heterocyclic groups, C1-C 30 Heterocyclic groups, C1-C 20 Heterocyclic groups or C1-C 10 Heterocyclic groups;

[0447] The term "C1-C" 60 "alkyl" includes C1-C 50 Alkyl, C1-C 30 Alkyl, C1-C 20 Alkyl or C1-C 10 alkyl;

[0448] The term "C2-C"60 "Alkenyl" includes C2-C 30 alkenyl, C2-C 20 alkenyl or C2-C 10 alkenyl;

[0449] The term "C2-C" 60 "Alkyne group" includes C2-C 30 alkynyl group, C2-C 20 Alkyne group or C2-C 10 alkynyl group;

[0450] The term "C1-C" 60 "Alkoxy" includes C1-C 30 Alkoxy, C1-C 20 Alkoxy or C1-C 10 Alkoxy;

[0451] The term "C6-C" 60 "Aryl" includes C6-C 50 Aryl, C6-C 40 Aryl, C6-C 30 Aryl, C6-C 20 Aryl or C6-C 15 Aryl;

[0452] The term "C1-C" 60 "Heteroary aryl" includes C1-C 50 heteroaryl, C1-C 40 heteroaryl, C1-C 30 heteroaryl, C1-C 20 heteroaryl or C1-C 10 Mixed aromatics;

[0453] "Monovalent non-aromatic fused polycyclic groups" include C8-C 60 Monovalent non-aromatic fused polycyclic groups, C8-C 50 Monovalent non-aromatic fused polycyclic groups, C8-C 40 Monovalent non-aromatic fused polycyclic groups, C8-C 30 Monovalent non-aromatic fused polycyclic groups or C8-C 20 Monovalent non-aromatic fused polycyclic groups;

[0454] The term "monovalent non-aromatic fused heterocyclic group" includes C1-C 60 Monovalent non-aromatic fused heterocyclic groups, C1-C 50 Monovalent non-aromatic fused heterocyclic groups, C1-C 40 Monovalent non-aromatic fused heterocyclic groups, C1-C 30 Monovalent non-aromatic fused heterocyclic groups or C1-C 20 Monovalent non-aromatic fused heterocyclic groups;

[0455] The term "C6-C" 60 "Aryloxy groups" include C6-C 50 Aryloxy group, C6-C 40 Aryloxy group, C6-C 30 Aryloxy group, C6-C 20 aryloxy or C6-C 15 aryloxy;

[0456] The term "C6-C" 60 "Arylthio" includes C6-C 50 Arylthio, C6-C 40 Arylthio, C6-C 30 Arylthio, C6-C 20 Aryl thiols or C6-C 15 Arylthio;

[0457] The term "C7-C" 60 "Aryl" includes C7-C 50 Aryl group, C7-C 40 Aryl group, C7-C 30 Aryl group, C7-C 20 Aryl or C7-C 15 Aryl alkyl groups; and

[0458] The term "C2-C" 60 "Heteroarylene" includes C2-C 50 Heteroaryl, C2-C 40 Heteroaryl, C2-C 30 Heteroaryl, C2-C 20 Heteroaryl or C2-C 15 Heteroaryl alkyl groups.

[0459] In the specification, the group "R" 10a "Can be:

[0460] Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro;

[0461] Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60Heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q) 12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof;

[0462] Each of the unsubstituted or substituted C3-Cs as described below 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 Carbocyclic group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 Heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or

[0463] -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 ).

[0464] In the instruction manual, Q1 to Q3, Q 11 To Q 13 Q 21 To Q 23 and Q 31 To Q 33 Each can be independently:

[0465] Hydrogen; Deuterium; -F; -Cl; -Br; -I; Hydroxyl group; Cyano group; Nitro group; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 alkoxy; or

[0466] Each of the unsubstituted or replaced groups (deuterium, -F, cyano, C1-C) 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 Carbocyclic group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

[0467] As used herein, the term "heteroatom" can refer to any atom other than carbon and hydrogen. Examples of heteroatoms may include O, S, N, P, Si, B, Ge, Se, and any combination thereof.

[0468] Examples of "transition metals" in the specification may include hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), and gold (Au).

[0469] In the specification, the term "Ph" refers to phenyl, the term "Me" refers to methyl, the term "Et" refers to ethyl, and the terms "tert-Bu" and "Bu" are used interchangeably. t Each refers to tert-butyl, the term "iso-Pr" refers to isopropyl, and the term "OMe" refers to methyl methacrylate.

[0470] As used herein, the term "biphenyl" may mean "phenyl substituted with a phenyl group". For example, "biphenyl" may be a phenyl group having a C6-C ratio. 60 Aryl groups are substituted phenyl groups.

[0471] As used herein, the term "terphenyl" may mean "phenyl substituted with biphenyl". For example, "terphenyl" may be a phenyl group having a C6-C substituted molecule. 60 Aryl-substituted C6-C 60 Aryl groups are substituted phenyl groups.

[0472] The number of carbon atoms specified in the substituents is illustrated only as an example. For example, in the C1-C substituents specified herein... 60 For alkyl groups, the number of carbon atoms 60 is merely an example, and the limitation of alkyl groups can also be applied to C1-C. 20 Alkyl groups. This interpretation can be applied in a substantially similar manner to the definition of other substituents as stated above.

[0473] Unless otherwise specified, the symbols * and *' as used herein each indicate the bonding site with the adjacent atom in the corresponding formula or part.

[0474] In this specification, "integers selected from 0 to 10" refers to integers selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. The above description of numerical ranges also applies to any other numerical ranges appearing in this specification, such as integers selected from 0 and 1, integers selected from 0 to 2, integers selected from 0 to 3, integers selected from 0 to 4, integers selected from 0 to 5, integers selected from 0 to 6, integers selected from 0 to 7, integers selected from 0 to 8, and integers selected from 0 to 9, etc.

[0475] The compounds and light-emitting devices according to the embodiments will be described in detail below with reference to the following examples.

[0476] [Example]

[0477] [Manufacturing of light-emitting devices]

[0478] [Comparative Example 1]

[0479] The ITO glass substrate (anode) was cut into 50mm × 50mm × 0.5mm dimensions, ultrasonically cleaned with isopropanol and pure water for 15 minutes each, and then cleaned by irradiation with ultraviolet light and exposure to ozone for 30 minutes. The ITO glass substrate was then placed in a vacuum deposition apparatus. On an ITO glass substrate (anode), a hole injection layer (NPD: 30nm) / hole transport layer (compound HT3: 100nm) / electron blocking layer (compound 1: 10nm) / emission layer (first host: second host + phosphorescent dopant + delayed fluorescence dopant: 400nm) / hole blocking layer (TSPO1 [LUMO level value = -2.52eV]: 20nm) / electron transport layer (TPBi [LUMO level value = -2.7eV]: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) are deposited to fabricate a light-emitting device.

[0480] Unless otherwise described in the Examples and Comparative Examples below, the hole transport host as the first host is compound HT-14, the electron transport host as the second host is compound ET-015, the weight ratio of the first host to the second host is 6:4, the phosphorescent dopant as the first dopant is compound PD39 (10 wt% based on 100 wt% of the emitter layer), and the delayed fluorescence dopant as the second dopant is compound D-01 (1.0 wt% based on 100 wt% of the emitter layer).

[0481]

[0482]

[0483] [Example 1]

[0484] The ITO glass substrate (anode) was cut into 50mm × 50mm × 0.5mm dimensions, ultrasonically cleaned with isopropanol and pure water for 15 minutes each, and then cleaned by irradiation with ultraviolet light and exposure to ozone for 30 minutes. The ITO glass substrate was then placed in a vacuum deposition apparatus. On an ITO glass substrate, a hole injection layer (NPD: 30nm) / a hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / a first electron blocking layer (compound HT-08 [HOMO level = -5.85eV]: 5nm) / a second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / an emission layer (first host: second host + phosphorescent dopant + delayed fluorescence dopant: 300nm) / a hole blocking layer as a single layer (compound 3 [LUMO level = -2.67eV]: 20nm) / an electron transport layer (TPBi: 30nm) / an electron injection layer (Yb: 1nm) / a cathode (Ag:Mg (weight ratio: 97:3), 10nm) / a capping layer (compound CP7: 70nm) are deposited to fabricate a light-emitting device.

[0485] [Example 2]

[0486] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), a hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level value = -5.5eV]: 100nm) / first electron blocking layer (compound 2 [HOMO level value = -5.92eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level value = -5.63eV]: 5nm) / emission layer (first host: second host + phosphorescent dopant + delayed fluorescence dopant: 300nm) / hole blocking layer as a single layer (compound 3 [LUMO level value = -2.67eV]: 20nm) / electron transport layer (TPBi: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) are deposited to fabricate a light-emitting device.

[0487] [Example 3]

[0488] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), a hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / first electron blocking layer (compound HT-08 [HOMO level = -5.85eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / emission layer (first host: second host + phosphorescent dopant + delayed fluorescence dopant: 300nm) / hole blocking layer as a single layer (compound 4 [LUMO level = -2.69eV]: 20nm) / electron transport layer (TPBi: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) are deposited to fabricate a light-emitting device.

[0489] [Example 4]

[0490] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), the following layers are deposited: hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / first electron blocking layer (compound HT-08 [HOMO level = -5.85eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / emitter layer (first host: second host + Phosphorescent dopant + delayed fluorescence dopant: 300nm) / second hole blocking layer (compound 5) [LUMO level value = -2.73eV]: 10nm) / first hole blocking layer (compound 3) [LUMO level value = -2.67eV]: 10nm) / electron transport layer (TPBi: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) to fabricate a light-emitting device.

[0491] [Example 5]

[0492] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), the following layers are deposited: hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / first electron blocking layer (compound 2 [HOMO level = -5.92eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / emission layer (first host: second host + phosphorescence). Dopant + delayed fluorescence dopant: 300nm) / second hole blocking layer (compound 5) [LUMO energy level value = -2.73eV]: 10nm) / first hole blocking layer (compound 3) [LUMO energy level value = -2.67eV]: 10nm) / electron transport layer (TPBi: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) to fabricate a light-emitting device.

[0493] [Example 6]

[0494] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), the following layers are deposited: hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / first electron blocking layer (compound 2 [HOMO level = -5.92eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / emission layer (first host: second host + phosphorescence). Dopant + delayed fluorescence dopant: 300nm) / second hole blocking layer (compound 5) [LUMO energy level value = -2.73eV]: 10nm) / first hole blocking layer (compound 4) [LUMO energy level value = -2.69eV]: 10nm) / electron transport layer (TPBi: 30nm) / electron injection layer (Yb: 1nm) / cathode (Ag:Mg (weight ratio: 97:3), 10nm) / capping layer (compound CP7: 70nm) to fabricate a light-emitting device.

[0495] [Comparative Example 2]

[0496] On an ITO glass substrate (anode) (50mm×50mm×0.5mm), the following layers are deposited: hole injection layer (NPD: 30nm) / hole transport layer (compound HT3 [HOMO level = -5.5eV]: 100nm) / first electron blocking layer (compound 2 [HOMO level = -5.92eV]: 5nm) / second electron blocking layer (compound 1 [HOMO level = -5.63eV]: 5nm) / emitter layer (first host: second host). + Dopant PD39 (400nm) / First hole blocking layer (compound 5) [LUMO level value = -2.73eV]: 10nm) / Second hole blocking layer (compound 4) [LUMO level value = -2.69eV]: 10nm) / Electron transport layer (TPBi: 30nm) / Electron injection layer (Yb: 1nm) / Cathode (Ag:Mg (weight ratio: 97:3), 10nm) / Capping layer (compound CP7: 70nm) to fabricate a light-emitting device.

[0497] The first host is compound HT-14 ([HOMO level value = -5.71eV]), and the second host is compound ET-015 ([LUMO level value = -2.85eV]), with a weight ratio of 6:4. Based on a 100wt% emitter layer, the amount of dopant PD39 is 11wt%.

[0498] To evaluate the characteristics of the light-emitting devices in the comparative examples and embodiments, at 10 mA / cm²... 2 The luminous efficiency (i.e., conversion efficiency) and lifetime were measured at a current density, and the results are shown in Table 1. In Table 1, the conversion efficiency and lifetime are shown as relative values ​​to the conversion efficiency and lifetime of Comparative Example 1, respectively, where the conversion efficiency and lifetime of Comparative Example 1 are set to 100%.

[0499] The luminous efficiency and lifespan of the light-emitting device were measured using Hamamatsu Optoelectronics' C9920-2-12 measuring device.

[0500] Table 1

[0501] Conversion efficiency (%) Lifetime (%) Comparative Example 1 100 100 Example 1 105 109 Example 2 103 112 Example 3 107 111 Example 4 106 113 Example 5 105 117 Example 6 108 123 Comparative Example 2 91 90

[0502] As can be seen from Table 1, compared with the light-emitting device of the comparative example, the light-emitting device of the embodiment has better luminous efficiency and lifespan.

[0503] As a result of measuring the electron mobility of the hole blocking layer and the first hole blocking layer as a single layer in Examples 1 to 6 and Comparative Example 2, the electron mobility of the (first) hole blocking layer of the aforementioned device is respectively 1.0E-0.8 cm⁻¹. 2 / Vs to 5.0E-06cm 2 / Vs in.

[0504] Electron mobility was measured by measuring the current density at each voltage using a KEITHLEY 2635B [NUBICOM], and mobility was calculated using space charge confinement current (SCLC) analysis (a detailed description of the SCLC analysis method will not be provided as it is well known in the relevant field).

[0505] According to the embodiment, in the light-emitting device including a first electron blocking layer, a second electron blocking layer, and a hole blocking layer, the emission region within the emission layer is not biased but wide. Therefore, the luminous efficiency and lifespan are improved.

[0506] Embodiments have been disclosed herein, and although terminology has been used, it is used and interpreted in a general and descriptive sense only and is not intended to be limiting. In some instances, as will be apparent to those skilled in the art, features, characteristics, and / or elements described in connection with embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as set forth in the claims.

Claims

1. A light-emitting device, comprising: First electrode; The second electrode facing the first electrode; as well as In the interlayer between the first electrode and the second electrode, The interlayer includes a hole transport layer, a first electron blocking layer, a second electron blocking layer, an emission layer, a hole blocking layer, and an electron transport layer. The emitter layer includes an electron transport host, a hole transport host, a first dopant, and a second dopant. The hole transport layer, the first electron blocking layer, the second electron blocking layer, the emitter layer, the hole blocking layer, and the electron transport layer are in contact with each other. Among the absolute values ​​of the highest occupied molecular orbital energy level of the hole transport layer, the highest occupied molecular orbital energy level of the first electron blocking layer, the second electron blocking layer, and the highest occupied molecular orbital energy level of the hole transport matrix, the absolute value of the highest occupied molecular orbital energy level of the first electron blocking layer is the largest. The first dopant is a metal-containing compound, and The second dopant is a metal-free compound.

2. The light-emitting device according to claim 1, wherein... The first electrode is the anode. The second electrode is a cathode, and The interlayer further includes: Hole injection layer between the first electrode and the emitter layer; and / or An electron injection layer between the second electrode and the emission layer.

3. The light-emitting device according to claim 1, wherein the emitting layer emits blue light.

4. The light-emitting device according to claim 1, wherein the absolute value of the highest occupied molecular orbital energy level of the hole transport layer is the smallest among the absolute values ​​of the highest occupied molecular orbital energy level of the hole transport layer, the highest occupied molecular orbital energy level of the first electron blocking layer, the second electron blocking layer, and the highest occupied molecular orbital energy level of the hole transport body.

5. The light-emitting device according to claim 1, wherein the absolute value of the highest occupied molecular orbital energy level of the hole transport host is greater than the absolute value of the highest occupied molecular orbital energy level of the second electron blocking layer.

6. The light-emitting device according to claim 1, wherein the absolute value of the difference between the absolute value of the highest occupied molecular orbital energy level of the hole transport layer and the absolute value of the highest occupied molecular orbital energy level of the first electron blocking layer is equal to or greater than 0.35 eV.

7. The light-emitting device according to claim 1, wherein... The hole-blocking layer is a single layer, and The electron mobility of the hole-blocking layer is 1.0E-0.8 cm⁻¹. 2 / Vs to 5.0E-06cm 2 Within the range of / Vs.

8. The light-emitting device according to claim 1, wherein... The hole blocking layer includes a first hole blocking layer and a second hole blocking layer. The first hole-blocking layer is in direct contact with the electron transport layer, and The electron mobility of the first hole-blocking layer is 1.0E-0.8 cm⁻¹. 2 / Vs to 5.0E-06cm 2 Within the range of / Vs.

9. The light-emitting device according to claim 8, wherein... The emitting layer, the second hole-blocking layer, and the first hole-blocking layer are in contact with each other, and Among the absolute values ​​of the lowest unoccupied molecular orbital energy level of the electron transport entity in the emission layer, the lowest unoccupied molecular orbital energy level of the second hole blocking layer, and the lowest unoccupied molecular orbital energy level of the first hole blocking layer, the absolute value of the lowest unoccupied molecular orbital energy level of the electron transport entity is the largest, and the absolute value of the lowest unoccupied molecular orbital energy level of the first hole blocking layer is the smallest.

10. The light-emitting device according to claim 8, wherein the absolute value of the difference between the absolute value of the lowest unoccupied molecular orbital energy level of the electron transport subject and the absolute value of the lowest unoccupied molecular orbital energy level of the first hole blocking layer is equal to or less than 0.2 eV.

11. The light-emitting device according to claim 8, wherein the second hole-blocking layer and the emitting layer are in direct contact with each other.

12. The light-emitting device according to claim 1, wherein the first dopant comprises a phosphorescent dopant.

13. The light-emitting device according to claim 1, wherein the second dopant comprises a delayed fluorescence dopant.

14. The light-emitting device according to claim 1, wherein, based on 100 wt% of the emitting layer, the amount of the first dopant is in the range of 3 wt% to 20 wt%.

15. The light-emitting device according to claim 1, wherein, based on 100 wt% of the emitting layer, the amount of the second dopant is in the range of 0.1 wt% to 2 wt%.

16. The light-emitting device according to claim 1, wherein the hole transport subject comprises a compound represented by formula 301-1, a compound represented by formula 301-2, or any combination thereof: In Equations 301-1 and 301-2, Ring A 301 To Ring A 304 Each independently is either unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group, X 301 is O, S, N[(L 304 ) xb4 -R 304 , C(R 304 )(R 305 ), or Si(R 304 )(R 305 ), xb22 and xb23 are each independently 0, 1, or 2. L 301 To L 304 Each independently is either unsubstituted or by at least one R 10a Replacement C3-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic group, R 301 To R 305 and R 311 To R 314 Each of the following groups is independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R. 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 Alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -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 ) or -P(=O)(Q 301 (Q) 302 ),and xb1 to xb4 are each an independent integer selected from 0 to 5. R 10a for: Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro; Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q) 12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof; Each of the unsubstituted or substituted C3-Cs as described below 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or -Si(Q 31 )(Q 32 )(Q 33 )、-N(Q 31 )(Q 32 )、-B(Q 31 )(Q 32 )、-C(=O)(Q 31 )、-S(=O)2(Q 31 ) or -P(=O)(Q 31 (Q) 32 ),and Q 11 To Q 13 Q 21 To Q 23 Q 31 To Q 33 and Q 301 To Q 303 Each independently is: Hydrogen; Deuterium; -F; -Cl; -Br; -I; Hydroxyl group; Cyano group; Nitro group; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 alkoxy; or Each of the unsubstituted or replaced groups (deuterium, -F, cyano, C1-C) 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 carbonyl group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

17. The light-emitting device according to claim 1, wherein the electron transport body comprises a compound represented by formula 1: In Equation 1, Rings Ar3 to Ar5 are each independently C5-C. 60 Carbocyclic or C1-C 60 Heterocyclic group, E is N or C(R”6), F is N or C(R”7), G is N or C(R”8), At least one of E, F, and G is N. R”3 to R”8 are each independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 Alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkenyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkenyl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryloxy, unsubstituted, or with at least one R 10a Replacement C6-C 60 Aryl thiols, unsubstituted or with at least one R 10a Replacement C1-C 60 heteroaryl, unsubstituted or with at least one R 10a Replacement C8-C 60 Monovalent non-aromatic fused polycyclic groups, unsubstituted or with at least one R 10a Replacement C1-C 60 Monovalent non-aromatic fused heterocyclic groups, -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), b”3 to b”5 are each an integer selected from 1 to 5 independently. When b”3 is 2 or greater, multiple R”3s are identical or different from each other; when b”4 is 2 or greater, multiple R”4s are identical or different from each other; and when b”5 is 2 or greater, multiple R”5s are identical or different from each other. Two adjacent substituents in R”3 to R”8 are optionally bonded to each other to form an unsubstituted or at least one R 10a Replacement C5-C 60 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 60 Heterocyclic groups, and R 10a for: Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro; Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q) 12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof; Each of the unsubstituted or substituted C3-Cs as described below 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or -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 Q1 to Q3, Q 11 To Q 13 Q 21 To Q 23 and Q 31 To Q 33 Each independently is: Hydrogen; Deuterium; -F; -Cl; -Br; -I; Hydroxyl group; Cyano group; Nitro group; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 alkoxy; or Each of the unsubstituted or replaced groups (deuterium, -F, cyano, C1-C) 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 carbonyl group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

18. The light-emitting device according to claim 1, wherein the first dopant comprises an organometallic compound represented by formula 401: Formula 401 M(L 401 ) xc1 (L 402 ) xc2 , In equations 401 and 402, M is a transition metal. L 401 For the ligand represented by Equation 402, xc1 is 1, 2, or 3. When xc1 is 2 or greater, two or more L 401 Whether they are the same or different, L 402 It is an organic ligand. xc2 is 0, 1, 2, 3 or 4. When xc2 is 2 or greater, two or more L 402 Whether they are the same or different, X 401 and X 402 Each can be either nitrogen or carbon. Ring A 401 And Ring A 402 Each independently constitutes C3-C 60 Carbocyclic or C1-C 60 Heterocyclic group, T 401 For single bonds, -O-, -S-, -C(=O)-, -N(Q)- 411 )-、-C(Q 411 (Q) 412 )-、-C(Q 411 )=C(Q 412 )-、-C(Q 411 = or = C =, X 403 and X 404 Each independently constitutes a chemical bond, O, S, N (Q) 413 ), B(Q) 413 ), P(Q 413 ), C(Q 413 (Q) 414 ) or Si(Q 413 (Q) 414 ), R 401 and R 402 Each of the following groups is independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted, or substituted with at least one R. 10a Replacement C1-C 20 Alkyl, unsubstituted, or with at least one R 10a Replacement C1-C 20 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 60 Carbocyclic, unsubstituted, or with at least one R 10a Replacement C1-C 60 Heterocyclic groups, -Si(Q) 401 (Q) 402 (Q) 403 -N(Q) 401 (Q) 402 -B(Q) 401 (Q) 402 -C(=O)(Q) 401 -S(=O)2(Q) 401 ) or -P(=O)(Q 401 (Q) 402 ), xc11 and xc12 are each independently an integer selected from 0 to 10, and In Equation 402, * and *' each indicate the binding site with M in Equation 401, and R 10a for: Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro; Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q) 12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof; Each of the unsubstituted or substituted C3-Cs as described below 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or -Si(Q 31 )(Q 32 )(Q 33 )、-N(Q 31 )(Q 32 )、-B(Q 31 )(Q 32 )、-C(=O)(Q 31 )、-S(=O)2(Q 31 ) or -P(=O)(Q 31 )(Q 32 ), and Q 11 To Q 13 Q 21 To Q 23 and Q 31 To Q 33 Q 401 To Q 403 and Q 411 To Q 414 Each of the following is independently: hydrogen; deuterium; -F; -Cl; -Br; -I; hydroxyl; cyano; nitro; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 Alkoxy groups; or each of the following unsubstituted or deuterated, -F, cyano, C1-C 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 carbonyl group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

19. The light-emitting device according to claim 1, wherein the second dopant comprises a compound represented by formula 2: In Equation 2, Y1 to Y3 are each independently O, S, N(R) 24 ), B(R) 24 ), C(R 24 (R) 25 ) or Si(R 24 (R) 25 ), c is 0 or 1. A 11 To A 13 Each independently is C5-C 30 Carbocyclic or C1-C 30 Heterocyclic group, R 21 To R 25 Each of the following groups is independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, amino, amido, hydrazine, hydrazone, carboxylic acid or a salt thereof, sulfonic acid or a salt thereof, phosphate or a salt thereof, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C2-C 60 Alkenyl, unsubstituted or with at least one R 10a Replacement C2-C 60 Alkyne group, unsubstituted or with at least one R 10a Replacement C1-C 60 Alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkyl, unsubstituted, or with at least one R 10a Replacement C3-C 10 Cycloalkenyl, unsubstituted, or with at least one R 10a Replacement C1-C 10 Heterocyclic alkenyl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryl, unsubstituted, or with at least one R 10a Replacement C6-C 60 aryloxy, unsubstituted, or with at least one R 10a Replacement C6-C 60 Aryl thiols, unsubstituted or with at least one R 10a Replacement C1-C 60 heteroaryl, unsubstituted or with at least one R 10a Replacement C8-C 60 Monovalent non-aromatic fused polycyclic groups, unsubstituted or with at least one R 10a Replacement C1-C 60 Monovalent non-aromatic fused heterocyclic groups, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -P(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1) or -P(=O)(Q1)(Q2), R 21 To R 25 Optionally bonded to each other to form unsubstituted or by at least one R 10a Replacement C5-C 30 The carbocyclic group is either unsubstituted or has at least one R group. 10a Replacement C1-C 30 Heterocyclic group, a21 to a23 are each an independent integer selected from 0 to 10. R 10a for: Deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano or nitro; Each of the unsubstituted or substituted C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group or C1-C 60 Alkoxy groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 11 (Q) 12 (Q) 13 -N(Q) 11 (Q) 12 -B(Q) 11 (Q) 12 -C(=O)(Q) 11 -S(=O)2(Q) 11 -P(=O)(Q) 11 (Q) 12 ) or any combination thereof; Each of the unsubstituted or substituted C3-Cs as described below 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl or C2-C 60 Heteroalkyl groups: deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, C1-C 60 Alkyl, C2-C 60 alkenyl, C2-C 60 Alkyne group, C1-C 60 Alkoxy, C3-C 60 carbonyl group, C1-C 60 Heterocyclic group, C6-C 60 Aryloxy group, C6-C 60 Arylthio, C7-C 60 Aryl alkyl, C2-C 60 heteroaryl, -Si(Q) 21 (Q) 22 (Q) 23 -N(Q) 21 (Q) 22 -B(Q) 21 (Q) 22 -C(=O)(Q) 21 -S(=O)2(Q) 21 -P(=O)(Q) 21 (Q) 22 ) or any combination thereof; or -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 Q1 to Q3, Q 11 To Q 13 Q 21 To Q 23 and Q 31 To Q 33 Each of the following is independently: hydrogen; deuterium; -F; -Cl; -Br; -I; hydroxyl; cyano; nitro; C1-C 60 Alkyl; C2-C 60 Alkenyl; C2-C 60 Alkyne group; C1-C 60 Alkoxy groups; or each of the following unsubstituted or deuterated, -F, cyano, C1-C 60 Alkyl, C1-C 60 C3-C substituted with alkoxy, phenyl, biphenyl or any combination thereof 60 carbonyl group, C1-C 60 Heterocyclic group, C7-C 60 Aryl or C2-C 60 Heteroaryl alkyl groups.

20. An electronic device comprising a light-emitting device according to any one of claims 1 to 19.

21. The electronic device of claim 20, wherein the electronic device is at least one selected from the group consisting of a display, a light source, a lighting device, a personal computer, a mobile phone, a digital camera, an electronic notebook, an electronic dictionary, a video game console, a medical tool, a fish finder, a measuring tool, an instrument, and a projector.

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