Ink composition for light emitting element, light emitting element manufactured using the same, and electronic device

Abstract

Disclosed are an ink composition for a light-emitting element, a light-emitting element manufactured using the same, and an electronic device, wherein the ink composition for a light-emitting element includes: a phosphine oxide-based charge transportable organic material; a first solvent of Chemical Formula 1; and a second solvent of Chemical Formula 2, <Chemical Formula 1> HOR1(O) m R2OH<Chemical Formula 2> (HO) a R 11 O(R 12 O) n R 13 (OH) b .

Description

TECHNICAL FIELD

[0001] The present application relates to an ink composition for a light-emitting element and a light-emitting element or the like manufactured using the same. BACKGROUND

[0002] A light-emitting element has a plurality of organic thin films stacked between an anode and a cathode, and materials thereof are known to include high molecular materials and low molecular materials. In addition, low molecular organic light-emitting materials are being developed in view of convenience of a synthetic route and the ability to perform high-purity purification.

[0003] Among these low molecular organic light-emitting materials, there are materials that are reported to be excellent in efficiency, lifetime, and color purity, and are being put to practical use.

[0004] When forming a low molecular organic light-emitting material into a thin film, a vacuum deposition method is generally used.

[0005] Although a high-performance organic light-emitting element is obtained by depositing a low molecular organic light-emitting material on a substrate with good thermal stability by a vacuum deposition method, there is a problem in that a high-vacuum device or a complicated manufacturing process is required. SUMMARY

[0006] An object of the present application is to provide an ink composition for a light-emitting element that can be used in a solution process, and a light-emitting element or the like manufactured by a manufacturing method using the ink composition.

[0007] According to an aspect, there is provided an ink composition for a light-emitting element including:

[0008] a phosphine oxide-based charge-transporting organic material;

[0009] a first solvent of Chemical Formula 1; and

[0010] a second solvent of Chemical Formula 2,

[0011] <Chemical Formula 1>

[0012] HOR1(O) m R2OH

[0013] wherein, in the Chemical Formula 1, R1and R2independently of each other represent a C1-C 60 alkylene, C3-C 10 cycloalkylene, or C1-C 10 heterocycloalkylene,

[0014] m represents 0 or 1,

[0015] <Chemical Formula 2>

[0016] (HO) a R11 O(R 12 O) n R 13 (OH) b

[0017] In the Chemical Formula 2, R 11 to R 13 independently of one another represent a C1-C 60 alkyl group, a C1-C 60 alkylene group, a C3-C 10 cycloalkyl group, a C3-C 10 cycloalkylene group, a C1-C 10 heterocycloalkyl group, or a C1-C 10 heterocycloalkylene group,

[0018] n represents an integer of 0 to 5,

[0019] a and b independently of one another represent 0 or 1, and the sum of a and b is 1.

[0020] According to another aspect, there is provided a light emitting element manufactured by a manufacturing method using the ink composition for a light emitting element.

[0021] According to still another aspect, there is provided an electronic device including the light emitting element.

[0022] By using the ink composition for a light emitting element according to an embodiment, all of the organic layers between the first electrode and the second electrode can be formed by a solution process.

[0023] Further, by using the ink composition for a light emitting element for the electron transport layer, it is possible to eliminate the constraint that the electron transport layer must be formed as a common layer by a deposition method, and thus, it is possible to form the electron transport layers including different electron transportable compounds, respectively, in accordance with R, G, and B. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a diagram schematically showing the structure of a light emitting element according to an embodiment.

[0025] Figure 2 is a cross-sectional view of a light emitting device according to an embodiment of the present application.

[0026] Figure 3 is a cross-sectional view of a light emitting device according to another embodiment of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 10: light emitting element

[0029] 110: first electrode

[0030] 130: intermediate layer

[0031] 150: second electrode DETAILED DESCRIPTION

[0032] Compared with an organic light emitting element manufactured by a deposition method, in the case of manufacturing an organic light emitting element by a coating method using a low molecular organic light emitting material or a high molecular organic light emitting material, there are aspects in which characteristics are insufficient.

[0033] In a solution process organic light emitting element developed so far, an element structure is applied in which a coating method is used until HIL, HTL, EML, but a deposition method is used for ETL, and thus actually research for a true coating method organic light emitting element is still insufficient.

[0034] The ink composition for a light emitting element according to an aspect includes: a phosphine oxide-based charge transportable organic material; a first solvent of Chemical Formula 1; and a second solvent of Chemical Formula 2.

[0035] <Chemical Formula 1>

[0036] HOR1(O) m R2OH

[0037] In the Chemical Formula 1, R1 and R2 independently of each other represent C1-C 60 alkylene, C3-C 10 cycloalkylene, or C1-C 10 heterocycloalkylene, and m represents 0 or 1.

[0038] <Chemical Formula 2>

[0039] (HO) a R 11 O(R 12 O) n R 13 (OH) b

[0040] In the Chemical Formula 2, R 11 to R 13 independently of each other represent C1-C 60 alkyl, C1-C 60 alkylene, C3-C 10 cycloalkyl, C3-C 10 cycloalkylene, C1-C 10 heterocycloalkyl, or C1-C 10 heterocycloalkylene, n represents an integer of 0 to 5, a and b independently of each other represent 0 or 1, and the sum of a and b is 1.

[0041] The alkyl and alkylene can be a straight chain structure or a branched chain structure.

[0042] In the Chemical Formula 1 and the Chemical Formula 2, the OH group can exist at any position of a linear or branched alkyl group, an alkylene group.

[0043] The Chemical Formula 2 can be represented by the following Chemical Formula 2-1, Chemical Formula 2-2, and Chemical Formula 2-3:

[0044] <Chemical Formula 2-1>

[0045]

[0046] <Chemical Formula 2-2>

[0047]

[0048] <Chemical Formula 2-3>

[0049]

[0050] In the Chemical Formula 2-1, the Chemical Formula 2-2, and the Chemical Formula 2-3, the definitions of R 11 , R 13 , a, b, and n are the same as those in the Chemical Formula 2.

[0051] According to an embodiment, the concentration of the ink composition for a light emitting element can be 0.01 to 5% by weight, based on the entire composition. For example, the concentration of the ink composition for a light emitting element can be 0.1 to 3% by weight, based on the entire composition. When the concentration of the ink composition for a light emitting element is in the range, inkjet-based coating can be smoothly performed, and a layer formed by evaporating a solvent through baking can be smoothly worked.

[0052] According to an embodiment, the ratio of the first solvent to the second solvent can be 20:1 to 2:1 (weight ratio). For example, the ratio of the first solvent to the second solvent can be 10:1 to 3:1. When the ratio of the first solvent to the second solvent is in the range, a layer formed by evaporating a solvent through baking can be smoothly worked.

[0053] According to an embodiment, the charge-transporting organic material can be an electron-transporting organic material.

[0054] According to an embodiment, the dP value of the Hansen parameter of the mixed solvent of the first solvent and the second solvent can be 9 or more.

[0055] According to an embodiment, the dH value of the Hansen parameter of the mixed solvent of the first solvent and the second solvent can be 9 or more.

[0056] Hansen parameters are parameters used to predict the degree to which a certain substance can be dissolved in another substance to form a solution.

[0057] In the Hansen parameters, the dP value is related to the energy from intermolecular dipole forces, and the dH value is related to the energy from intermolecular hydrogen bonds.

[0058] According to an embodiment, the difference between the boiling points of the first solvent and the second solvent can be 10℃ or less.

[0059] According to an embodiment, the viscosity of the mixed solvent of the first solvent and the second solvent at room temperature can be 30 cp or less.

[0060] According to an embodiment, the surface tension of the mixed solvent of the first solvent and the second solvent can be 30 dyn / cm to 38 dyn / cm.

[0061] According to an embodiment, the dP value of the Hansen parameter of the phosphine oxide-based charge transportable organic compound can be 9 or more.

[0062] According to an embodiment, the dH value of the Hansen parameter of the phosphine oxide-based charge transportable organic compound can be 5 or more.

[0063] In the case where the dP value range and the dH value range of the Hansen parameter of the mixed solvent of the first solvent and the second solvent are in the above ranges, the difference between the boiling points of the first solvent and the second solvent and the viscosity at room temperature are in the above ranges, the surface tension of the mixed solvent of the first solvent and the second solvent is in the above range, and the dP value range and the dH value range of the Hansen parameter of the phosphine oxide-based charge transportable organic compound are in the above ranges, it is most suitable to use the light emitting element ink composition for a solution process (for example, by inkjet coating), and damage to the lower film of the layer formed using the light emitting element ink composition is minimized.

[0064] According to an embodiment, the first solvent of Chemical Formula 1 can include any one of the following compounds:

[0065]

[0066] According to an embodiment, the second solvent of Chemical Formula 2 can include any one of the following compounds:

[0067]

[0068] According to an embodiment, the phosphine oxide-based charge transportable organic material refers to an organic material including p=O.

[0069] For example, the phosphine oxide-based charge transportable organic material can include any one of the following compounds:

[0070]

[0071]

[0072] According to another aspect, a light emitting element includes a first electrode, a second electrode facing the first electrode, and an intermediate layer interposed between the first electrode and the second electrode and including a light emitting layer,

[0073] wherein any layer in the intermediate layer can be manufactured by using a manufacturing method of an ink composition for a light emitting element including a phosphine oxide-based charge transportable organic material, a first solvent of Chemical Formula 1, and a second solvent of Chemical Formula 2.

[0074] According to an embodiment, the first electrode can be an anode, and the second electrode can be a cathode,

[0075] The intermediate layer can further include a hole transport region disposed between the first electrode and the light emitting layer, and an electron transport region disposed between the light emitting layer and the second electrode,

[0076] The hole transport region can include a hole injection layer, a hole transport layer, a light emitting auxiliary layer, an electron blocking layer, or any combination thereof,

[0077] The electron transport region can include a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

[0078] According to an embodiment, the any layer can be an electron transport layer.

[0079] According to an embodiment, the manufacturing method can be an inkjet-based manufacturing method.

[0080] According to an embodiment, the light emitting layer and the any layer can be in contact.

[0081] According to an embodiment, the light emitting layer can include a host and a dopant, and the molecular weight of the host and the molecular weight of the dopant can each be 640 or more. In a case where the molecular weight of the host and the molecular weight of the dopant are each less than 640, and an ink composition for a light emitting element according to an embodiment of the present application is coated on the light emitting layer, the light emitting layer as a lower film can be damaged.

[0082] According to one embodiment, the ink composition for the light-emitting element may further include a metal-containing substance. The metal-containing substance will be described later.

[0083] According to one embodiment, the intermediate layer further includes a hole injection layer and a hole transport layer, which are manufactured by solution processing (e.g., spin coating, inkjet printing, etc.). Since the formation of the hole injection layer, hole transport layer, and light-emitting layer by solution processing is well known, details are omitted.

[0084] According to another aspect, the electronic device includes the light-emitting element.

[0085] According to one implementation example, the electronic device may further include a thin-film transistor.

[0086] The thin-film transistor may include a source electrode and a drain electrode.

[0087] The first electrode of the light-emitting element can be electrically connected to at least one of the source electrode and drain electrode of the thin-film transistor.

[0088] According to one embodiment, the electronic device may also include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof.

[0089] In this specification, "intermediate layer" refers to the term all layers of a single layer and / or multiple layers arranged between the first electrode and the second electrode in the light-emitting element.

[0090] [about Figure 1 [Explanation]

[0091] Figure 1 A schematic cross-sectional view of a light-emitting element 10 according to an embodiment of the present invention is shown. The light-emitting element 10 includes a first electrode 110, an intermediate layer 130, and a second electrode 150.

[0092] The following is for reference Figure 1 The structure and manufacturing method of the light-emitting element 10 according to one embodiment of the present invention are described below.

[0093] [First Electrode 110]

[0094] exist Figure 1The lower portion of the first electrode 110 or the upper portion of the second electrode 150 can be additionally provided with a substrate. As the substrate, a glass substrate or a plastic substrate can be used. Alternatively, the substrate can be a flexible substrate, for example, can include a plastic having excellent heat resistance and durability, such as polyimide, polyethyleneterephthalate (PET), polycarbonate, polyethylenenaphtalate, polyarylate (PAR), polyetherimide, or any combination thereof.

[0095] The first electrode 110 can be formed, for example, by providing a first electrode material on the upper portion of the substrate using a deposition method or a sputtering method, or the like. In the case where the first electrode 110 is an anode, a material having a high work function that is easy to inject holes can be used as the first electrode material.

[0096] The first electrode 110 can be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. In order to form the first electrode 110 as a transmissive electrode, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), or any combination thereof can be used as the first electrode material. Alternatively, in order to form the first electrode 110 as a semi-transmissive electrode or a reflective electrode, magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), or any combination thereof can be used as the first electrode material.

[0097] The first electrode 110 can have a single layer structure consisting of a single layer or a multi-layer structure including a plurality of layers. For example, the first electrode 110 can have a three-layer structure of ITO / Ag / ITO.

[0098] [Intermediate Layer 130]

[0099] An intermediate layer 130 is disposed on the upper portion of the first electrode 110. The intermediate layer 130 includes a light emitting layer.

[0100] The intermediate layer 130 can further include a hole transport region disposed between the first electrode 110 and the light emitting layer, and an electron transport region disposed between the light emitting layer and the second electrode 150.

[0101] The intermediate layer 130 can include, in addition to various organic substances, a metal-containing compound such as an organometallic compound, an inorganic substance such as a quantum dot, and the like.

[0102] Further, the intermediate layer 130 can include i) two or more light-emitting layers which are sequentially stacked between the first electrode 110 and the second electrode 150, and ii) a charge generation layer which is arranged between the two light-emitting layers. In the case where the intermediate layer 130 includes the light-emitting layers and the charge generation layer as described above, the light-emitting element 10 can be a tandem light-emitting element.

[0103] [Hole transport region in intermediate layer 130]

[0104] The hole transport region can have i) a single-layer structure which consists of a single layer consisting of a single substance, ii) a single-layer structure which consists of a single layer including a plurality of substances which are different from each other, or iii) a multi-layer structure which includes a plurality of layers including a plurality of substances which are different from each other.

[0105] The hole transport region can include a hole injection layer, a hole transport layer, a light-emitting auxiliary layer, an electron blocking layer, or any combination thereof.

[0106] For example, the hole transport region can have a multi-layer structure of a hole injection layer / hole transport layer, a hole injection layer / hole transport layer / light-emitting auxiliary layer, a hole injection layer / light-emitting auxiliary layer, or a hole injection layer / hole transport layer / electron blocking layer, which are sequentially stacked from the first electrode 110.

[0107] The hole transport region can include a compound represented by Chemical Formula 201 below, a compound represented by Chemical Formula 202 below, or any combination thereof:

[0108] <Chemical Formula 201>

[0109]

[0110] <Chemical Formula 202>

[0111]

[0112] In the Chemical Formulas 201 and 202,

[0113] L 201 to L 204 may be each independently at least one R 10aC3-C, whether substituted or not 60 The carbocyclic group or is surrounded by at least one R 10a C1-C, whether substituted or not 60 Heterocyclic groups,

[0114] L 205 For *-O-*', *-S-*', *-N(Q) 201 )-*'、by at least one R 10a C1-C, whether substituted or not 20 Alkylene, by at least one R 10a C2-C, whether substituted or not 20 alkenyl group, with at least one R 10a C3-C, whether substituted or not 60 The carbocyclic group or is surrounded by at least one R 10a C1-C, whether substituted or not 60 Heterocyclic groups,

[0115] xa1 to xa4 are independent integers from 0 to 5.

[0116] xa5 is an integer from 1 to 10.

[0117] R 201 To R 204 And Q 201 Independent of each other, for at least one R 10a C3-C, whether substituted or not 60 The carbocyclic group or is surrounded by at least one R 10a C1-C, whether substituted or not 60 Heterocyclic groups,

[0118] R 201 and R 202 Optionally, it can be used via a single bond, by at least one R 10a Substituted or unsubstituted C1-C5 alkylene groups or those with at least one R 10a The substituted or unsubstituted C2-C5 alkenyl groups are linked together to form a group consisting of at least one R group. 10a C8-C, whether replaced or not 60 Polycyclic groups (e.g., carbazole groups, etc.) (e.g., see compound HT16 below, etc.),

[0119] R 203 and R 204 Optionally, it can be used via a single bond, by at least one R 10a Substituted or unsubstituted C1-C5 alkylene groups or those with at least one R 10asubstituted or unsubstituted C2-C5 alkenylene groups are linked to each other, thereby forming a C8-C 10a substituted or unsubstituted C8-C 60 a polycyclic group, na1may be one of integers from 1 to 4.

[0120] For example, the Chemical Formula 201 and the Chemical Formula 202 can include at least one of groups represented by the following Chemical Formulas CY201 to CY217, respectively:

[0121]

[0122] In the Chemical Formulas CY201 to CY217, the descriptions of R 10b and R 10c refer to the descriptions of R 10a in the present specification, respectively. The ring CY 201 to the ring CY 204 may be C3-C 20 carbocyclic group or C1-C 20 heterocyclic group, independently of each other. At least one hydrogen in the Chemical Formulas CY201 to CY217 can be substituted with R 10a substituted or unsubstituted as recited in the present specification.

[0123] According to an implementation example, the ring CY 201 to the ring CY 204 in the Chemical Formulas CY201 to CY217 can be phenyl group, naphthyl group, phenanthryl group, or anthryl group, independently of each other.

[0124] According to another implementation example, each of the Chemical Formula 201 and the Chemical Formula 202 can include at least one of groups represented by the Chemical Formulas CY201 to CY203.

[0125] According to still another implementation example, the Chemical Formula 201 can include at least one of groups represented by the Chemical Formulas CY201 to CY203, and at least one of groups represented by the Chemical Formulas CY204 to CY217, respectively.

[0126] According to still another implementation example, xa1in the Chemical Formula 201 can be 1, R 201 may be a group represented by one of the Chemical Formulas CY201 to CY203, xa2may be 0, R 202 may be a group represented by one of the Chemical Formulas CY204 to CY207.

[0127] According to still another implementation example, each of the Chemical Formula 201 and the Chemical Formula 202 can not include groups represented by the Chemical Formulas CY201 to CY203.

[0128] According to still another implementation example, each of the Chemical Formula 201 and the Chemical Formula 202 can not include the group represented by the Chemical Formula CY201 to CY203, and can include at least one of the groups represented by the Chemical Formula CY204 to CY217.

[0129] As still another example, each of the Chemical Formula 201 and the Chemical Formula 202 can not include the group represented by the Chemical Formula CY201 to CY217.

[0130] For example, the hole transport region can include one of the following compounds HT1 to HT44, m-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, Spiro-TPD (Spiro-TPD), Spiro-NPB (Spiro-NPB), 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 / camphor sulfonic acid (Pani / CSA), polyaniline / poly(4-styrenesulfonate) (Pani / PSS), or any combination thereof:

[0131]

[0132]

[0133]

[0134]

[0135]

[0136] The thickness of the hole transport region can be about to about For example, it can be about to about If the hole transport region includes a hole injection layer and a hole transport layer or any combination thereof, the thickness of the hole injection layer can be about to about For example, about to about The thickness of the hole transport layer can be about to about For example, about to about In the case where the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer satisfy the ranges as described above, a hole transport characteristic to a satisfactory degree can be obtained without substantially increasing a driving voltage.

[0137] The light emitting auxiliary layer is a layer that functions to compensate for an optical resonance distance according to the wavelength of light emitted from the light emitting layer, thereby increasing light emission efficiency, and the electron blocking layer is a layer that functions to prevent leakage of electrons from the light emitting layer to the hole transport region. The light emitting auxiliary layer and the electron blocking layer can include a substance that can be included in the hole transport region described above.

[0138] [p-dopant]

[0139] The hole transport region can include a charge generating substance in order to improve conductivity in addition to the substances described above. The charge generating substance can be uniformly or non-uniformly dispersed (for example, a single layer form consisting of the charge generating substance) within the hole transport region.

[0140] The charge generating substance can be, for example, a p-dopant.

[0141] For example, the LUMO level of the p-dopant can be -3.5 eV or less.

[0142] According to an implementation example, the p-dopant can include a quinone derivative, a cyano-containing compound, a compound including an element EL1 and an element EL2, or any combination thereof.

[0143] Examples of the quinone derivative can include TCNQ, F4-TCNQ, and the like.

[0144] Examples of the cyano-containing compound can include HAT-CN, a compound represented by Chemical Formula 221 below, and the like.

[0145]

[0146] <Chemical Formula 221>

[0147]

[0148] In the chemical formula 221,

[0149] R 221 to R 223 independently of one another are a C3-C 10a substituted or unsubstituted C3-C 60 carbon ring group or a C1-C 10a substituted or unsubstituted C1-C 60 heterocyclic group,

[0150] at least one of the R 221 to R 223 independently of one another are a cyano group; -F; -Cl; -Br; -I; a C1-C 20 alkyl group substituted with a cyano group, -F, -Cl, -Br, -I, or any combination thereof; or a C3-C 60 carbon ring group or a C1-C 60 heterocyclic group substituted with any combination of the above.

[0151] In the compound containing element EL1 and element EL2, element EL1 can be a metal, a metalloid, or a combination thereof, and element EL2 can be a nonmetal, a metalloid, or a combination thereof.

[0152] Examples of the metal can 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.); lanthanide metals (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.).

[0153] Examples of the metalloid can include silicon (Si), antimony (Sb), tellurium (Te), etc.

[0154] Examples of the nonmetal can include oxygen (O), halogens (e.g., F, Cl, Br, I, etc.), etc.

[0155] For example, the compound containing element EL1 and element EL2 can include a metal oxide, a metal halide (e.g., a metal fluoride, a metal chloride, a metal bromide, a metal iodide, etc.), a metalloid halide (e.g., a metalloid fluoride, a metalloid chloride, a metalloid bromide, a metalloid iodide, etc.), a metal telluride, or any combination thereof.

[0156] Examples of the metal oxide can include tungsten oxides (e.g., WO, W2O3, WO2, WO3, W2O5, etc.), vanadium oxides (e.g., VO, V2O3, VO2, V2O5, etc.), molybdenum oxides (MoO, Mo2O3, MoO2, MoO3, Mo2O5, etc.), rhenium oxides (e.g., ReO3, etc.), and the like.

[0157] Examples of the metal halide can include alkali metal halides, alkaline earth metal halides, transition metal halides, post-transition metal halides, lanthanide metal halides, and the like.

[0158] Examples of the alkali metal halide can include LiF, NaF, KF, RbF, CsF, LiCl, NaCl, KCl, RbCl, CsCl, LiBr, NaBr, KBr, RbBr, CsBr, LiI, NaI, KI, RbI, CsI, and the like.

[0159] Examples of the alkaline earth metal halide can include BeF2, MgF2, CaF2, SrF2, BaF2, BeCl2, MgCl2, CaCl2, SrCl2, BaCl2, BeBr2, MgBr2, CaBr2, SrBr2, BaBr2, BeI2, MgI2, CaI2, SrI2, BaI2, and the like.

[0160] Examples of the transition metal halide can 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.), tantalum halides (e.g., TaF3, TaCl3, TaBr3, 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, ReI2, etc.), iron halides (e.g., FeF2, FeCl2, FeBr2, FeI2, etc.), ruthenium halides (e.g., RuF2, RuCl2, RuBr2, RuI2, etc.), osmium halides (e.g., OsF2, OsCl2, OsBr2, OsI2, etc.), cobalt halides (e.g., CoF2, CoCl2, CoBr2, CoI2, etc.), rhodium halides (e.g., RhF2, RhCl2, RhBr2, RhI2, etc.), iridium halides (e.g., IrF2, IrCl2, IrBr2, 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.), copper halides (e.g., CuF, CuCl, CuBr, CuI, etc.), silver halides (e.g., AgF, AgCl, AgBr, AgI, etc.), gold halides (e.g., AuF, AuCl, AuBr, AuI, etc.), and the like.

[0161] Examples of the post-transition metal halide can include zinc halides (e.g., ZnF2, ZnCl2, ZnBr2, ZnI2, etc.), indium halides (e.g., InI3, etc.), tin halides (e.g., SnI2, etc.), and the like.

[0162] Examples of the lanthanide metal halide can include YbF, YbF2, YbF3, SmF3, YbCl, YbCl2, YbCl3, SmCl3, YbBr, YbBr2, YbBr3, SmBr3, YbI, YbI2, YbI3, SmI3, and the like.

[0163] Examples of the metalloid halide can include antimony halide (e.g., SbCl5, etc.), and the like.

[0164] Examples of the metal telluride can include alkali metal telluride (e.g., Li2Te, Na2Te, K2Te, Rb2Te, Cs2Te, etc.), alkaline earth metal telluride (e.g., BeTe, MgTe, CaTe, SrTe, BaTe, etc.), transition metal telluride (e.g., TiTe2, ZrTe2, HfTe2, V2Te3, Nb2Te3, Ta2Te3, Cr2Te3, Mo2Te3, W2Te3, MnTe, TcTe, ReTe, FeTe, RuTe, OsTe, CoTe, RhTe, IrTe, NiTe, PdTe, PtTe, Cu2Te, CuTe, Ag2Te, AgTe, Au2Te, etc.), post-transition metal telluride (e.g., ZnTe, etc.), lanthanide metal telluride (e.g., LaTe, CeTe, PrTe, NdTe, PmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, etc.), and the like.

[0165] [Light-emitting layer in intermediate layer 130]

[0166] In the case where the light-emitting element 10 is a full-color light-emitting element, the light-emitting layer can be patterned into a red light-emitting layer, a green light-emitting layer, and / or a blue light-emitting layer as independent sub-pixels. Alternatively, the light-emitting layer can have a structure in which two or more of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer are in contact with or separated from each other, or can have a structure in which two or more of the red light-emitting substance, the green light-emitting substance, and the blue light-emitting substance are mixed without being separated into layers, so as to emit white light.

[0167] The light-emitting layer can include a host and a dopant. The dopant can include a phosphorescent dopant, a fluorescent dopant, or any combination thereof.

[0168] The content of the dopant in the light-emitting layer can be about 0.01 to about 15 parts by weight, based on about 100 parts by weight of the host.

[0169] Alternatively, the light-emitting layer can include a quantum dot.

[0170] Further, the light-emitting layer can include a delayed fluorescent substance. The delayed fluorescent substance can function as a host or a dopant in the light-emitting layer.

[0171] The thickness of the light-emitting layer can be about to about For example, it can be about up to approximately When the thickness of the light-emitting layer meets the range described above, excellent light-emitting characteristics can be exhibited without substantially increasing the driving voltage.

[0172] [main body]

[0173] The main body may include a compound represented by the following chemical formula 301:

[0174] <Chemical Formula 301>

[0175] [Ar 301 ] xb11 -[(L 301 ) xb1 -R 301 ] xb21 .

[0176] In the chemical formula 301,

[0177] Ar 301 and L 301 Independent of each other, for at least one R 10a C3-C, whether substituted or not 60 The carbocyclic group or is surrounded by at least one R 10a C1-C, whether substituted or not 60 Heterocyclic groups,

[0178] xb11 is 1, 2, or 3.

[0179] xb1 is an integer between 0 and 5.

[0180] R 301 It is hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, and is surrounded by at least one R. 10a C1-C, whether substituted or not 60 Alkyl, with at least one R 10a C2-C, whether substituted or not 60 alkenyl, with at least one R 10a C2-C, whether substituted or not 60 Alkyne group, with at least one R 10a C1-C, whether substituted or not 60 Alkyl group, with at least one R 10a C3-C, whether substituted or not 60 Carbocyclic group, with at least one R 10a C1-C, whether substituted or not 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 ),

[0181] xb21 is one of the integers from 1 to 5.

[0182] Regarding Q 301 To Q 303 For further details, please refer to the section on Q in this manual. 11 Explanation.

[0183] For example, when xb11 is 2 or more in the chemical formula 301, two or more Ar 301 They can be connected to each other using a single key.

[0184] As another example, the body may include a compound represented by chemical formula 301-1, a compound represented by chemical formula 301-2, or any combination thereof:

[0185] <Chemical Formula 301-1>

[0186]

[0187] <Chemical Formula 301-2>

[0188]

[0189] In the chemical formulas 301-1 to 301-2,

[0190] Ring A 301 To Ring A 304 Independent of each other, for at least one R 10a C3-C, whether substituted or not 60 The carbocyclic group or is surrounded by at least one R 10a C1-C, whether substituted or not 60 Heterocyclic groups,

[0191] X 301 For O, S, N-[(L 304 ) xb4 -R 304 ]、C(R 304 (R) 305 ) or Si(R 304 (R) 305 ),

[0192] xb22 and xb23 are independently of each other 0, 1 or 2,

[0193] about L 301 , xb1 and R 301 are explained with reference to the description of this specification, respectively,

[0194] about L 302 to L 304 are explained independently of each other with reference to the description of said L 301 ,

[0195] about xb2 to xb4 are explained independently of each other with reference to the description of said xb1,

[0196] about R 302 to R 305 and R 311 to R 314 are explained with reference to the description of said R 301 , respectively.

[0197] As another example, said host can comprise an alkaline earth metal complex, a post-transition metal complex or any combination thereof. For example, said host can comprise a Be complex (e.g. the following compound H55), a Mg complex, a Zn complex or any combination thereof.

[0198] As another example, host can comprise one of the following compounds H1 to H124, 9,10- Di(2-naphthyl)anthracene (ADN), 2-Methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN), 9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN), 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP), 1,3-di-9-carbazolylbenzene (mCP), 1,3,5-tri(carbazol-9-yl)benzene (TCP) or any combination thereof:

[0199]

[0200]

[0201]

[0202]

[0203]

[0204]

[0205] [Phosphorescent dopant]

[0206] The phosphorescent dopant can include at least one transition metal as a central metal.

[0207] The phosphorescent dopant can include a monodentate ligand, a bidentate ligand, a tridentate ligand, a tetradentate ligand, a pentadentate ligand, a hexadentate ligand, or any combination thereof.

[0208] The phosphorescent dopant can be electrically neutral.

[0209] For example, the phosphorescent dopant can include an organometallic compound represented by Chemical Formula 401 below:

[0210] <Chemical Formula 401>

[0211] M(L 401 ) xc1 (L 402 ) xc2

[0212] <Chemical Formula 402>

[0213]

[0214] In the Chemical Formula 401 and Chemical Formula 402,

[0215] M is 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)),

[0216] L 401 is a ligand represented by the Chemical Formula 402, and xc1 is 1, 2, or 3, wherein, in the case where xc1 is 2 or more, two or more L 401 are the same as or different from each other,

[0217] L 402 is an organic ligand, and xc2 is 0, 1, 2, 3, or 4, wherein, in the case where xc2 is 2 or more, two or more L 402 are the same as or different from each other,

[0218] X401 to X 402 independently of one another nitrogen or carbon,

[0219] ring A 401 and ring A 402 independently of one another C3-C 60 carbocyclic radical or C1-C 60 heterocyclic radical,

[0220] T 401 is 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=,

[0221] X 403 and X 404 independently of one another a bond (e.g. a covalent or coordinate bond), O, S, N(Q 413 ), B(Q 413 ), P(Q 413 ), C(Q 413 )(Q 414 ) or Si(Q 413 )(Q 414 ),

[0222] the explanations regarding the Q 411 to Q 414 refer to the explanations regarding Q 11 in the present specification, respectively,

[0223] R 401 and R 402 independently of one another hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl, cyano, nitro, unsubstituted or substituted by at least one R 10a C1-C 20 alkyl, unsubstituted or substituted by at least one R 10a C1-C 20 alkoxy, unsubstituted or substituted by at least one R 10a C3-C 60 carbocyclic radical, unsubstituted or substituted by at least one R 10a C1-C 60 heterocyclic radical, -Si(Q 401 )(Q 402 )(Q 403 ), -N(Q 401 )(Q 402 ), -B(Q401 (Q) 402 -C(=O)(Q) 401 -S(=O)2(Q) 401 ) or -P(=O)(Q 401 (Q) 402 ),

[0224] Regarding the Q 401 To Q 403 For further details, please refer to the section on Q in this manual. 11 The explanation,

[0225] xc11 and xc12 are independent integers from 0 to 10.

[0226] In chemical formula 402, * and *' are binding sites with M in chemical formula 401, respectively.

[0227] For example, in the chemical formula 402, i)X 401 It can be nitrogen, X 402 It could be carbon; or ii)X 401 and X 402 Both can be nitrogen.

[0228] As another example, in the chemical formula 402, when xc1 is 2 or more, two or more L 401 The two rings A in 401 Optionally, T can be used as a connection base. 402 And connected to each other, or two rings A 402 It can be selectively connected via T as a linker. 403 They are interconnected (refer to compounds PD1 to PD4 and PD7 below). Regarding the T... 402 And T 403 For further details, please refer to the section on T in this manual. 401 Explanation.

[0229] In the chemical formula 401, L 402 It can be any organic ligand. For example, the L... 402 It may include halogen groups, diketone groups (e.g., acetylacetone groups), carboxylic acid groups (e.g., pyridine carboxylic acid groups), -C (=O), isonitrile groups, -CN groups, phosphorus groups (e.g., phosphine groups, phosphite groups, etc.) or any combination thereof.

[0230] For example, the phosphorescent dopant may include one or any combination of the following compounds PD1 to PD25:

[0231]

[0232] [Fluorescent dopant]

[0233] The fluorescent dopant can include an amine-containing group compound, a styryl group-containing compound, or any combination thereof.

[0234] For example, the fluorescent dopant can include a compound represented by Chemical Formula 501 below:

[0235] [Chemical Formula 501]

[0236]

[0237] In the Chemical Formula 501,

[0238] Ar 501 , L 501 to L 503 , R 501 , and R 502 are each independently a C3-C 10a substituted or unsubstituted C3-C 60 carbocyclic group or a C1-C 10a substituted or unsubstituted C1-C 60 heterocyclic group,

[0239] xd1 to xd3 are each independently 0, 1, 2, or 3,

[0240] xd4 can be 1, 2, 3, 4, 5, or 6.

[0241] For example, in the Chemical Formula 501, Ar 501 may include a condensed ring group (e.g., an anthracene group, a group, a pyrene group, etc.) in which three or more monocyclic groups are condensed with each other.

[0242] As another example, in the Chemical Formula 501, xd4 can be 2.

[0243] For example, the fluorescent dopant can include one of the following compounds FD1 to FD36, DPVBi, DPAVBi, or any combination thereof:

[0244]

[0245]

[0246]

[0247] [Delayed fluorescent substance]

[0248] The light-emitting layer can include a delayed fluorescence substance.

[0249] In the present specification, the delayed fluorescence substance can be selected from any compound capable of emitting delayed fluorescence by a delayed fluorescence emission principle.

[0250] The delayed fluorescence substance included in the light-emitting layer can function as a host or a dopant depending on the kind of other substance included in the light-emitting layer.

[0251] According to an implementation example, the difference between the triplet energy level (eV) of the delayed fluorescence substance and the singlet energy level (eV) of the delayed fluorescence substance can be 0 eV or more and 0.5 eV or less. By making the difference between the triplet energy level (eV) of the delayed fluorescence substance and the singlet energy level (eV) of the delayed fluorescence substance satisfy the range as described above, the up-conversion of the delayed fluorescence substance from the triplet state to the singlet state can be effectively achieved, thereby effectively improving the light-emitting efficiency or the like of the light-emitting element 10.

[0252] For example, the delayed fluorescence substance can include i) at least one electron donor (for example, a πelectron-rich C3-C 60 πelectron-rich C3-C 60 cyclic group) or the like) and a substance including at least one electron acceptor (for example, a sulfoxide group, a cyano group, a πelectron-deficient nitrogen-containing C1-C 60 πelectron-deficient nitrogen-containing C1-C 60 cyclic group) or the like); ii) a substance having a C8-C 60 polycyclic group including two or more condensed ring groups while sharing boron (B).

[0253] Examples of the delayed fluorescence substance can include at least one of the following compounds DF1 to DF9:

[0254]

[0255]

[0256] [Quantum dots]

[0257] The light-emitting layer can include quantum dots.

[0258] In the present specification, quantum dots indicate crystals of semiconductor compounds, and can include any substance capable of emitting light of a plurality of light-emitting wavelengths depending on the crystal size.

[0259] For example, the diameter of the quantum dot can be about 1 nm to 10 nm.

[0260] The quantum dot can be synthesized by a wet chemical process, a metal organic chemical vapor deposition process, a molecular beam epitaxy process, or the like.

[0261] The wet chemical process is a method of growing quantum dot particles by crystallization after mixing an organic solvent and a precursor substance. The organic solvent functions as a dispersant that naturally coats the surface of the quantum dot crystal, and adjusts the growth of the crystal, and thus, compared to a vapor deposition method such as metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE), it is easier, and the growth of the quantum dot particles can be controlled by a low-cost process.

[0262] The quantum dot can include a group II-VI semiconductor compound, a group III-V semiconductor compound, a group III-VI semiconductor compound, a group I-III-VI semiconductor compound, a group IV-VI semiconductor compound, a group IV element or compound, or any combination thereof.

[0263] Examples of the group II-VI semiconductor compound can include the following compounds or any combination thereof: binary compounds such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, etc.; ternary compounds such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, etc.; quaternary compounds such as CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, etc.

[0264] Examples of the III-V semiconductor compound can include the following compounds or any combination thereof: binary compounds such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, etc.; ternary compounds such as GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InAlP, InNAs, InNSb, InPAs, InPSb, etc.; quaternary compounds such as GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, etc. In addition, the III-V semiconductor compound can further include a Group II element. Examples of the III-V semiconductor compound further including a Group II element can include InZnP, InGaZnP, InAlZnP, etc.

[0265] Examples of the III-VI semiconductor compound can include the following compounds or any combination thereof: binary compounds such as GaS, GaSe, Ga2Se3, GaTe, InS, InSe, In2S3, In2Se3, InTe, etc.; ternary compounds such as InGaS3, InGaSe3, etc.

[0266] Examples of the I-III-VI semiconductor compound can include the following compounds or any combination thereof: ternary compounds such as AgInS, AgInS2, CuInS, CuInS2, CuGaO2, AgGaO2, AgAlO2, etc.

[0267] Examples of the IV-VI semiconductor compound can include the following compounds or any combination thereof: binary compounds such as SnS, SnSe, SnTe, PbS, PbSe, PbTe, etc.; ternary compounds such as SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, etc.; quaternary compounds such as SnPbSSe, SnPbSeTe, SnPbSTe, etc.

[0268] The Group IV element or compound can include the following compounds or any combination thereof: single elements such as Si, Ge, etc.; binary compounds such as SiC, SiGe, etc.

[0269] Each element included in the multinary compound such as the binary compound, the ternary compound, and the quaternary compound can exist in the particle at a uniform concentration or at a non-uniform concentration.

[0270] Further, the quantum dot can have a single structure or a double structure of a core-shell in which the concentration of each element included in the quantum dot is uniform. For example, the substance included in the core and the substance included in the shell can be different from each other.

[0271] The shell of the quantum dot can function as a protective layer for preventing chemical denaturation of the core for maintaining a semiconductor property and / or a charging layer for imparting an electrophoretic property to the quantum dot. The shell can be a single layer or multiple layers. The interface of the core and the shell can have a concentration gradient in which the concentration of the element existing in the shell is lower as it is closer to the center.

[0272] Examples of the shell of the quantum dot can include a metal, a metalloid, or a non-metal oxide, a semiconductor compound, or a combination thereof, etc. Examples of the metal, the metalloid, or the non-metal oxide can include the following compounds or any combination thereof: binary compounds such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO, etc.; ternary compounds such as MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4, etc. Examples of the semiconductor compound can include a Group II-VI semiconductor compound, a Group III-V semiconductor compound, a Group III-VI semiconductor compound, a Group I-III-VI semiconductor compound, a Group IV-VI semiconductor compound, or any combination thereof as described in the specification. For example, the semiconductor compound can include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, or any combination thereof.

[0273] The quantum dot can have a full width of half maximum (FWHM) of a light emission wavelength spectrum of about 45 nm or less, specifically about 40 nm or less, and more specifically about 30 nm or less, within which range color purity or color reproducibility can be improved. Also, light emitted by such a quantum dot is emitted in all directions, and thus optical viewing angle can be improved.

[0274] Also, specifically, the morphology of the quantum dots can be a spherical, pyramidal, multi-arm, or cubic nanoparticle, a nanotube, a nanowire, a nanofiber, a nanoplatelet, or the like.

[0275] Since the band gap can be adjusted by adjusting the size of the quantum dots, light of a variety of wavelength bands can be obtained from the quantum dot light-emitting layer. Accordingly, a light-emitting element that emits light of a variety of wavelengths can be realized by using quantum dots of different sizes from one another. Specifically, the size of the quantum dots can be selected in such a manner that red light, green light, and / or blue light is emitted. Also, the size of the quantum dots can be constituted in such a manner that light of a variety of colors is combined to emit white light.

[0276] [Electron transport region in intermediate layer 130]

[0277] The electron transport region can have i) a single-layer structure consisting of a single layer consisting of a single substance, ii) a single-layer structure consisting of a single layer including a plurality of substances different from one another, or iii) a multi-layer structure including a plurality of layers including a plurality of substances different from one another.

[0278] The electron transport region includes an electron transport layer (ETL). The electron transport region can further include a hole blocking layer, an electron injection layer, or any combination thereof.

[0279] The electron transport layer can be manufactured by using a manufacturing method of an ink composition for a light-emitting element including a phosphine oxide-based charge transportable organic substance, a first solvent of Chemical Formula 1, and a second solvent of Chemical Formula 2.

[0280] For example, the electron transport region can have a structure in which an electron transport layer / electron injection layer or a hole blocking layer / electron transport layer / electron injection layer, and the like are sequentially stacked from the light-emitting layer.

[0281] The electron transport region (e.g., a hole blocking layer or an electron transport layer in the electron transport region) can include a non-metal-containing compound including at least one π-electron-deficient nitrogen-containing C1-C 60 π-electron-deficient nitrogen-containing C1-C 60 cyclic group.

[0282] For example, the electron transport region can include a compound represented by the following Chemical Formula 601.

[0283] <Chemical Formula 601>

[0284] [Ar 601 ] xe11 -[(L 601 ) xe1 -R 601 ] xe21

[0285] in the chemical formula 601,

[0286] Ar 601 and L 601 are independently of each other a C3-C 10a carbocyclic group which is substituted by at least one R 60 or a C1-C 10a heterocyclic group which is substituted or unsubstituted by at least one R 60 ,

[0287] xe11 is 1, 2 or 3,

[0288] xe1 is 0, 1, 2, 3, 4 or 5,

[0289] R 601 is a C3-C 10a carbocyclic group which is substituted or unsubstituted by at least one R 60 or a C1-C 10a heterocyclic group which is substituted or unsubstituted by at least one R 60 , -Si(Q 601 )(Q 602 )(Q 603 ), -C(=O)(Q 601 ), -S(=O)2(Q 601 ) or -P(=O)(Q 601 )(Q 602 ),

[0290] the explanations regarding the Q 601 to Q 603 refer to the explanations regarding Q 11 in the present specification, respectively,

[0291] xe21 is 1, 2, 3, 4 or 5,

[0292] at least one of the Ar 601 , L 601 and R 601 may be independently of each other a π-electron poor nitrogen containing C1-C 10a ring group which is substituted or unsubstituted by at least one R 60 .

[0293] For example, in the chemical formula 601, in a case where xe11 is 2 or more, two or more Ar 601 may be connected to each other by a single bond.

[0294] As another example, in the chemical formula 601, Ar 601 may be a substituted or unsubstituted anthracene group.

[0295] As still another example, the electron transport region can include a compound represented by the following chemical formula 601-1:

[0296] <Chemical Formula 601-1>

[0297]

[0298] In the chemical formula 601-1,

[0299] X 614 is N or C(R 614 ), X 615 is N or C(R 615 ), X 616 is N or C(R 616 ), and X 614 to X 616 is N,

[0300] The description about L 611 to L 613 is respectively referred to the description about the L 601 ,

[0301] The description about xe611 to xe613 is respectively referred to the description about the xe1,

[0302] The description about R 611 to R 613 is respectively referred to the description about the R 601 ,

[0303] R 614 to R 616 may be independently of each other hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C1-C 20 alkyl group, a C1-C 20 alkoxy group, a C3-C 10a carbocyclic group substituted or unsubstituted with at least one R 60 , or a C1-C 10a heterocyclic group substituted or unsubstituted with at least one R 60 .

[0304] For example, in the Chemical Formula 601 and the Chemical Formula 601-1, xe1and xe611to xe613may be independently of each other 0, 1, or 2.

[0305] The electron transport region can include one of the following compounds ET1to ET45, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, TAZ, NTAZ, or any combination thereof:

[0306]

[0307]

[0308]

[0309] The thickness of the electron transport region can be about to about For example, it can be about to about In the case where the electron transport region includes a hole blocking layer, an electron transport layer, or any combination thereof, the thickness of the hole blocking layer or the electron transport layer can be independently of each other about to about For example, it can be about to about The thickness of the electron transport layer can be about to about For example, it can be about to about In the case where the thickness of the hole blocking layer and / or the electron transport layer satisfies the range as described above, satisfactory electron transport characteristics can be obtained without substantially increasing the driving voltage.

[0310] The electron transport region (for example, the electron transport layer in the electron transport region) can include a metal-containing substance in addition to the substances as described above.

[0311] The metal-containing substance can include an alkali metal complex, an alkaline earth metal complex, or any combination thereof. The metal ion of the alkali metal complex can be a Li ion, a Na ion, a K ion, a Rb ion, or a Cs ion, and the metal ion of the alkaline earth metal complex can be a Be ion, a Mg ion, a Ca ion, a Sr ion, or a Ba ion. For example, the metal-containing substance can be a Li-based compound or a Ca-based compound. The ligand coordinated with the metal ion of the alkali metal complex and the alkaline earth metal complex can independently of each other include a hydroxyquinoline, a hydroxyisoquinoline, a hydroxybenzoquinoline, a hydroxyacridine, a hydroxyphenanthridine, a hydroxyphenyl-oxazole, a hydroxyphenyl-thiazole, a hydroxyphenyl-oxadiazole, a hydroxyphenyl-thiadiazole, a hydroxyphenyl-pyridine, a hydroxyphenyl-benzimidazole, a hydroxyphenyl-benzothiazole, a bipyridine, a phenanthroline, a cyclopentadiene, or any combination thereof.

[0312] For example, the metal-containing substance can include a Li complex. The Li complex can include, for example, the following compounds ET-D1 (LiQ) or ET-D2:

[0313]

[0314] The electron transport region can include an electron injection layer that facilitates electron injection from the second electrode 150. The electron injection layer can be in direct contact with the second electrode 150.

[0315] The electron injection layer can have: i) a single layer structure consisting of a single layer consisting of a single substance; ii) a single layer structure consisting of a single layer including a plurality of substances different from each other; or iii) a multi-layer structure including a plurality of layers including a plurality of substances different from each other.

[0316] The electron injection layer can include 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.

[0317] The alkali metal can include Li, Na, K, Rb, Cs, or any combination thereof. The alkaline earth metal can include Mg, Ca, Sr, Ba, or any combination thereof. The rare earth metal can include Sc, Y, Ce, Tb, Yb, Gd, or any combination thereof.

[0318] The alkali metal-containing compound, the alkaline earth metal-containing compound, and the rare earth metal-containing compound can include an oxide, a halide (e.g., fluoride, chloride, bromide, or iodide, etc.), a telluride, or any combination thereof of each of the alkali metal, the alkaline earth metal, and the rare earth metal.

[0319] The alkali metal-containing compound can include an alkali metal oxide such as Li2O, Cs2O, K2O, etc., an alkali metal halide such as LiF, NaF, CsF, KF, LiI, NaI, CsI, KI, etc., or any combination thereof. The alkaline earth metal-containing compound can include an alkaline earth metal oxide such as BaO, SrO, CaO, Ba x Sr 1-x O (x is a real number satisfying 0 < x < 1), Ba x Ca 1-x O (x is a real number satisfying 0 < x < 1), etc. The rare earth metal-containing compound can include YbF3, ScF3, Sc2O3, Y2O3, Ce2O3, GdF3, TbF3, YbI3, ScI3, TbI3, or any combination thereof. Alternatively, the rare earth metal-containing compound can include a lanthanide telluride. Examples of the lanthanide telluride can 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, Lu2Te3, etc.

[0320] The alkali metal complex, the alkaline earth metal complex, and the rare earth metal complex can include i) one of the ions of the alkali metal, the alkaline earth metal, and the rare earth metal as described above; and ii) a ligand bound to the metal ion, for example, a hydroxyquinoline, a hydroxyisoquinoline, a hydroxybenzoquinoline, a hydroxyacridine, a hydroxyphenanthridine, a hydroxyphenyl-oxazole, a hydroxyphenyl-thiazole, a hydroxyphenyl-oxadiazole, a hydroxyphenyl-thiadiazole, a hydroxyphenyl-pyridine, a hydroxyphenyl-benzimidazole, a hydroxyphenyl-benzothiazole, a bipyridine, a phenanthroline, a cyclopentadiene, or any combination thereof.

[0321] The electron injection layer can be composed of only the alkali metal, the alkaline earth metal, the rare earth metal, the alkali metal-containing compound, the alkaline earth metal-containing compound, the rare earth metal-containing compound, the alkali metal complex, the alkaline earth metal complex, the rare earth metal complex, or any combination thereof as described above, or can further include an organic material (e.g., a compound represented by Chemical Formula 601).

[0322] According to an implementation example, the electron injection layer can i) consist of an alkali metal-containing compound (e.g., an alkali metal halide), or ii) consist of a) an alkali metal-containing compound (e.g., an alkali metal halide); and b) an alkali metal, an alkaline earth metal, a rare earth metal, or any combination thereof. For example, the electron injection layer can be a KI:Yb co-deposited layer, a RbI:Yb co-deposited layer, or the like.

[0323] In the case where the electron injection layer further includes an organic material, the alkali metal, the alkaline earth metal, the rare earth metal, the alkali metal-containing compound, the alkaline earth metal-containing compound, the rare earth metal-containing compound, the alkali metal complex, the alkaline earth metal complex, the rare earth metal complex, or any combination thereof can be uniformly or non-uniformly dispersed in a matrix including the organic material.

[0324] The thickness of the electron injection layer can be approximately to approximately For example, it can be approximately to approximately In the case where the thickness of the electron injection layer satisfies the aforementioned range, satisfactory electron injection characteristics can be obtained without substantially increasing a driving voltage.

[0325] [Second Electrode 150]

[0326] A second electrode 150 is disposed on the upper portion of the intermediate layer 130 as described above. The second electrode 150 can be a cathode as an electron injection electrode, in which case a metal, an alloy, a conductive compound, or a combination thereof having a low work function can be used as a material for the second electrode 150.

[0327] The second electrode 150 can 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 can be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.

[0328] The second electrode 150 can have a single layer structure as a single layer or a multi-layer structure having a plurality of layers.

[0329] [Encapsulation Layer]

[0330] A first capping layer can be disposed outside the first electrode 110, and / or a second capping layer can be disposed outside the second electrode 150. Specifically, the light emitting element 10 can have a structure in which a first capping layer, the first electrode 110, the intermediate layer 130, and the second electrode 150 are sequentially stacked; a structure in which the first electrode 110, the intermediate layer 130, the second electrode 150, and a second capping layer are sequentially stacked; or a structure in which a first capping layer, the first electrode 110, the intermediate layer 130, the second electrode 150, and a second capping layer are sequentially stacked.

[0331] Light generated in the intermediate layer 130 of the light emitting element 10 from the light emitting layer can be extracted to the outside through the first electrode 110, which is a semi-transmissive electrode or a transmissive electrode, and the first capping layer, and light generated in the intermediate layer 130 of the light emitting element 10 from the light emitting layer can be extracted to the outside through the second electrode 150, which is a semi-transmissive electrode or a transmissive electrode, and the second capping layer.

[0332] The first capping layer and the second capping layer can function to improve external light emission efficiency according to the principle of constructive interference. Therefore, the light extraction efficiency of the light emitting element 10 can be improved, thereby improving the light emission efficiency of the light emitting element 10.

[0333] The first capping layer and the second capping layer can each include a substance having a refractive index (at 589 nm) of 1.6 or more.

[0334] The first capping layer and the second capping layer can each independently be an organic capping layer including an organic substance, an inorganic capping layer including an inorganic substance, or an organic-inorganic composite capping layer including an organic substance and an inorganic substance.

[0335] At least one of the first capping layer and the second capping layer can each independently include a carbocyclic compound, a heterocyclic compound, an amine-containing group compound, porphine derivatives, phthalocyanine derivatives, naphthalocyanine derivatives, an alkali metal complex, an alkaline earth metal complex, or any combination thereof. The carbocyclic compound, the heterocyclic compound, and the amine-containing group compound can be optionally substituted with a substituent including O, N, S, Se, Si, F, Cl, Br, I, or any combination thereof. According to an implementation example, at least one of the first capping layer and the second capping layer can each independently include an amine-containing group compound.

[0336] For example, at least one of the first capping layer and the second capping layer can independently of each other include a compound represented by Chemical Formula 201, a compound represented by Chemical Formula 202, or any combination thereof.

[0337] According to still another example, at least one of the first capping layer and the second capping layer can independently of each other include one of the compounds HT28 to HT33, one of the following compounds CP1 to CP6, β-NPB, or any compound thereof:

[0338]

[0339] [Electronic device]

[0340] The light emitting element can be included in various electronic devices. For example, an electronic device including the light emitting element can be a light emitting device, an authentication device, or the like.

[0341] The electronic device (e.g., a light emitting device) can include, in addition to the light emitting element, i) a color filter, ii) a color conversion layer, or iii) a color filter and a color conversion layer. The color filter and / or the color conversion layer can be arranged in at least one traveling direction of light emitted from the light emitting element. For example, the light emitted from the light emitting element can be blue light. The description for the light emitting element is referred to the above. According to an example, the color conversion layer can include quantum dots. The quantum dots can be, for example, quantum dots as described in the present specification.

[0342] The electronic device can include a first substrate. The first substrate can include a plurality of sub-pixel regions, the color filter can include a plurality of color filter regions corresponding to each of the plurality of sub-pixel regions, and the color conversion layer can include a plurality of color conversion regions corresponding to each of the plurality of sub-pixel regions.

[0343] A pixel defining film is arranged between the plurality of sub-pixel regions to define each sub-pixel region.

[0344] The color filter can further include a plurality of color filter regions and a light shielding pattern arranged between the plurality of color filter regions, and the color conversion layer can further include a plurality of color conversion regions and a light shielding pattern arranged between the plurality of color conversion regions.

[0345] The plurality of color filter regions (or plurality of color conversion regions) includes: a first region that emits first color light; a second region that emits second color light; and / or a third region that emits third color light, wherein the first color light, the second color light, and / or the third color light can have different maximum emission wavelengths from each other. For example, the first color light can be red light, the second color light can be green light, and the third color light can be blue light. For example, the plurality of color filter regions (or plurality of color conversion regions) can include quantum dots. Specifically, the first region can include red quantum dots, the second region can include green quantum dots, and the third region can not include quantum dots. Descriptions regarding quantum dots are made with reference to the contents described in the present specification. The first region, the second region, and / or the third region can further include a scatterer, respectively.

[0346] For example, the light emitting element can emit first light, the first region can absorb the first light to emit first-1 color light, the second region can absorb the first light to emit second-1 color light, and the third region can absorb the first light to emit third-1 color light. At this time, the first-1 color light, the second-1 color light, and the third-1 color light can have different maximum emission wavelengths from each other. Specifically, the first light can be blue light, the first-1 color light can be red light, the second-1 color light can be green light, and the third-1 color light can be blue light.

[0347] The electronic device can further include a thin film transistor in addition to the light emitting element as described above. The thin film transistor can include a source electrode, a drain electrode, and an active layer, and any one of the source electrode and the drain electrode can be electrically connected to any one of the first electrode and the second electrode of the light emitting element.

[0348] The thin film transistor can further include a gate electrode, a gate insulating film, and the like.

[0349] The active layer can include crystalline silicon, amorphous silicon, an organic semiconductor, an oxide semiconductor, and the like.

[0350] The electronic device can further include a sealing portion that seals the light emitting element. The sealing portion can be disposed between the color filter and / or the color conversion layer and the light emitting element. The sealing portion can allow light from the light emitting element to be extracted to the outside while blocking penetration of external gas and moisture into the light emitting element. The sealing portion can be a sealing substrate including a transparent glass substrate or a plastic substrate. The sealing portion can be a thin film encapsulation layer including one or more organic layers and / or inorganic layers. In the case where the sealing portion is a thin film encapsulation layer, the electronic device can be flexible.

[0351] On the sealing portion, in addition to the color filter and / or color conversion layer, various functional layers can be additionally arranged depending on the use of the electronic device. Examples of the functional layers can include a touch screen layer, a polarizing layer, and the like. The touch screen layer can be a pressure-sensitive touch screen layer, a capacitive touch screen layer, or an infrared touch screen layer. The authentication device can be, for example, a biometric authentication device that authenticates an individual using biometric information of a living body (e.g., a fingertip, a pupil, or the like).

[0352] The authentication device can include a biometric information collection unit in addition to the light emitting element as described above.

[0353] The electronic device can be applied to various displays, light sources, illuminations, personal computers (e.g., mobile personal computers), cellular phones, digital cameras, electronic organizers, electronic dictionaries, electronic game machines, medical devices (e.g., electronic thermometers, sphygmomanometers, blood glucose meters, pulse measurement devices, pulse wave measurement devices, electrocardiogram display devices, ultrasonic diagnostic devices, endoscope display devices), fish finders, various measurement devices, meter classes (e.g., meter classes of vehicles, aircraft, and ships), projectors, and the like.

[0354] [Explanation of Figure 2 and Figure 3 ]

[0355] Figure 2 is a cross-sectional view of a light emitting device according to an embodiment of the present application.

[0356] Figure 2 The light emitting device of

[0357] The substrate 100 can be a flexible substrate, a glass substrate, or a metal substrate. A buffer layer 210 can be arranged on the substrate 100. The buffer layer 210 can prevent impurities from permeating through the substrate 100, and can function to provide a flat surface on an upper portion of the substrate 100.

[0358] A thin film transistor (TFT) can be arranged on the buffer layer 210. The thin film transistor (TFT) can include an active layer 220, a gate electrode 240, a source electrode 260, and a drain electrode 270.

[0359] The active layer 220 can include an inorganic semiconductor such as silicon or polysilicon, an organic semiconductor, or an oxide semiconductor, and include a source region, a drain region, and a channel region.

[0360] A gate insulating film 230 for insulating the active layer 220 from the gate electrode 240 can be disposed on an upper portion of the active layer 220, and a gate electrode 240 can be disposed on an upper portion of the gate insulating film 230.

[0361] An interlayer insulating film 250 can be disposed on an upper portion of the gate electrode 240. The interlayer insulating film 250 is disposed between the gate electrode 240 and the source electrode 260 and between the gate electrode 240 and the drain electrode 270, thereby functioning to insulate them.

[0362] A source electrode 260 and a drain electrode 270 can be disposed on the interlayer insulating film 250. The interlayer insulating film 250 and the gate insulating film 230 can be formed to expose a source region and a drain region of the active layer 220, and the source electrode 260 and the drain electrode 270 can be disposed to be in contact with the exposed source region and the drain region of the active layer 220.

[0363] The thin film transistor (TFT) can be electrically connected to the light emitting element to drive the light emitting element, and be protected by a passivation layer 280. The passivation layer 280 can include an inorganic insulating film, an organic insulating film, or a combination thereof. The light emitting element is provided on the passivation layer 280. The light emitting element includes a first electrode 110, an intermediate layer 130, and a second electrode 150.

[0364] The first electrode 110 can be disposed on the passivation layer 280. The passivation layer 280 can be disposed to expose a predetermined region of the drain electrode 270 without covering the entire drain electrode 270, and the first electrode 110 can be disposed to be connected to the exposed drain electrode 270.

[0365] A pixel defining film 290 including an insulating substance can be disposed on the first electrode 110. The pixel defining film 290 can expose a predetermined region of the first electrode 110, and the intermediate layer 130 can be formed in the exposed region. The pixel defining film 290 can be an organic film of a polyimide-based or a polyacrylic-based. Although not shown, a portion or more of the layers of the intermediate layer 130 can extend to an upper portion of the pixel defining film 290 to be disposed in a form of a common layer. Figure 2

[0366] The second electrode 150 can be disposed on the intermediate layer 130, and a capping layer 170 can be additionally formed on the second electrode 150. The capping layer 170 can be formed to cover the second electrode 150.

[0367] An encapsulating portion 300 can be disposed on the capping layer 170. The encapsulating portion 300 can be disposed on the light emitting element to function to protect the light emitting element from moisture or oxygen. The encapsulating portion 300 can include an inorganic film including silicon nitride (SiN x ​), silicon oxide (SiO x ), indium tin oxide, indium zinc oxide, or any combination thereof; an organic film, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyformal, polyarylate, hexamethyldisiloxane, an acrylic resin (e.g., polymethyl methacrylate, polyacrylic acid, etc.), an epoxy resin (e.g., aliphatic glycidyl ether (AGE), etc.), or any combination thereof; or a combination of an inorganic film and an organic film.

[0368] Figure 3 is a cross-sectional view of a light-emitting device according to another embodiment of the present application.

[0369] except that the light-blocking pattern 500 and the functional area 400 are additionally arranged on the upper portion of the package 300, Figure 3 The light-emitting device of Figure 2 The light-emitting device of Figure 3 The light-emitting element of the light-emitting device of

[0370] [Manufacturing method]

[0371] Each layer included in the hole-transporting region, the light-emitting layer, and each layer included in the electron-transporting region can be formed in a predetermined region by various methods such as a vacuum deposition method, a spin coating method, a casting method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a laser printing method, a laser-induced thermal imaging (LITI) method, and the like.

[0372] In the case where each layer included in the hole-transporting region, the light-emitting layer, and each layer included in the electron-transporting region are formed by a spin coating method, a coating condition can be selected in a range of, for example, a coating speed of about 2000 rpm to about 5000 rpm and a heat treatment temperature of about 80 °C to 200 °C, in consideration of a material to be included in a layer to be formed and a structure of the layer to be formed.

[0373] [General definition of substituent]

[0374] In the present specification, C3-C 60 A carbocyclic group represents a cyclic group having a carbon atom number of 3 to 60, in which only carbon is used as a ring-forming atom, a C1-C 60The heterocyclic group represents a ring group having a carbon atom number of 1 to 60, in which, in addition to carbon, a heteroatom is included as a ring-forming atom. The C3-C 60 The carbon ring group and the C1-C 60 The heterocyclic group can be either a monocyclic group composed of one ring or a polycyclic group in which two or more rings are condensed with each other. For example, the C1-C 60 The number of ring-forming atoms of the heterocyclic group can be 3 to 60.

[0375] In the present specification, the ring group includes the C3-C 60 carbon ring group and the C1-C 60 heterocyclic group.

[0376] In the present specification, the πelectron-rich C3-C 60 ring group (πelectron-rich C3-C 60 cyclic group) represents a ring group having a carbon atom number of 3 to 60, which does not include *-N=*’ as a ring-forming moiety, and the πelectron-deficient nitrogen-containing C1-C 60 ring group (πelectron-deficient nitrogen-containing C1-C 60 cyclic group) represents a heterocyclic group having a carbon atom number of 1 to 60, which includes *-N=*’ as a ring-forming moiety.

[0377] For example,

[0378] The C3-C 60 The C3-C ring group, a perylenyl group, a pentaphenyl group, a heptaphenyl group, a tetracene group, a chrysene group, a periflanthene group, a triphenylene group, a coronene group, a valence isomer of coronene group, an ovalene group, an indene group, a fluorene group, a spirobifluorene group, a benzofluorene group, an indenophenanthrene group, or an indenoanthracene group),

[0379] C1-C 60The heterocyclic group can be: i) a group T2; ii) a condensed ring group in which two or more groups T2 are condensed with each other; or iii) a condensed ring group in which one or more groups T2 and one or more groups T1 are condensed with each other (for example, a pyrrole group, a thiophene group, a furan group, an indole group, a benzoindole group, a naphthoindole group, an isoindole group, a benzoisoindole group, a naphthoisoindole group, a benzothiophyl group, a benzofuran group, a carbazole group, a dibenzothiophyl group, a dibenzofuran group, an indolocarbazole group, an indolophthalazine group, a benzofuranocarbazole group, a benzothienocarbazole group, a benzothiophylcarbazole group, a benzothiophylisoindole group, a benzocarbazole group, a benzonaphthofuran group, a benzonaphthothiophene group, a benzonaphthothiophyl group, a benzofuranodibenzofuran group, a benzofuranodibenzothiophene group, a benzothienodibenzothiophene group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzisoxazole group, a benzothiazole group, a benzisothiazole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a benzoisoquinoline group, a quinoxaline group, a benzoquinoxaline group, a quinazoline group, a benzoquinazoline group, a phenanthroline group, a cinnoline group, a phthalazine group, a naphthylidine group, an imidazopyridine group, an imidazopyrimidine group, an imidazotriazine group, an imidazopyrazine group, an imidazopyridazine group, an azacarbazole group, an azafuorene group, an azadibenzothiophyl group, an azadibenzofuran group, and the like),

[0380] The π-electron rich C3-C 60 The ring group can be: i) a group T1; ii) a condensed ring group in which two or more groups T1 are condensed with each other; iii) a group T3; iv) a condensed ring group in which two or more groups T3 are condensed with each other; or v) a condensed ring group in which one or more groups T3 and one or more groups T1 are condensed with each other (for example, the C3-C 60a carbon ring group, a 1H-pyrrolyl group, a thiopyrrolyl group, a borole group, a 2H-pyrrolyl group, a 3H-pyrrolyl group, a thiophene group, a furan group, an indolyl group, a benzoindolyl group, a naphthoindolyl group, an isoindolyl group, a benzoisoindolyl group, a naphthoisoindolyl group, a benzothiopyrrolyl group, a benzothiophene group, a benzofuran group, a carbazolyl group, a dibenzothiopyrrolyl group, a dibenzothiophene group, a dibenzofuran group, an indolocarbazolyl group, an indolocarbazolyl group, a benzofuranocarbazolyl group, a benzothienocarbazolyl group, a benzothiopyrrolocarbazolyl group, a benzoindolocarbazolyl group, a benzo-carbazolyl group, a benzonaphthofuran group, a benzonaphthothiophene group, a benzonaphthothiopyrrole group, a benzofuranodibenzofuran group, a benzofuranodibenzothiophene group, a benzothienodibenzothiophene group, and the like,

[0381] the π-electron-deficient nitrogen-containing C1-C 60 The ring group can be: i) a group T4; ii) a condensed ring group in which two or more groups T4 are condensed with each other; iii) a condensed ring group in which one or more groups T4 and one or more groups T1 are condensed with each other; iv) a condensed ring group in which one or more groups T4 and one or more groups T3 are condensed with each other; or v) a condensed ring group in which one or more groups T4, one or more groups T1, and one or more groups T3 are condensed with each other (for example, a pyrazolyl group, an imidazolyl group, a triazolyl group, an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, a thiazolyl group, an isothiazolyl group, a thiadiazolyl group, a benzopyrazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzisoxazolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a pyridyl group, a pyrimidyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolyl group, an isoquinolyl group, a benzoquinolyl group, a benzoisoquinolyl group, a quinoxalyl group, a benzoquinoxalyl group, a quinazolyl group, a benzoquinazolyl group, a phenanthrolinyl group, a cinnolinyl group, a phthalazinyl group, a naphthidinyl group, an imidazopyridyl group, an imidazopyrimidyl group, an imidazotriazinyl group, an imidazopyrazinyl group, an imidazopyridazinyl group, an azacarbazolyl group, an azafluorenyl group, an azadibenzothiopyrrolyl group, an azadibenzothiophene group, an azadibenzofuran group, and the like),

[0382] the group T1 is a cyclopropane group, a cyclobutane group, a cyclopentane group, a cyclohexane group, a cycloheptane group, a cyclooctane group, a cyclobutene group, a cyclopentene group, a cyclopentadiene group, a cyclohexene group, a cyclohexadiene group, a cycloheptene group, an adamantane group, a norbornane (or, bicyclo[2.2.1]heptane) group, a norbornene group, a bicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane, a bicyclo[2.2.2]octane group or a phenyl group,

[0383] the group T2 is a furan group, a thiophene group, a 1H-pyrrole group, a silole group, a borole group, a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, a thiadiazole group, an azapyrimidine group, an azaborole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group or a tetrazine group, a pyrrolidine group, an imidazolidine group, a dihydropyrrole group, a piperidine group, a tetrahydropyridine group, a dihydropyridine group, a hexahydropyrimidine group, a tetrahydropyrimidine group, a dihydropyrimidine group, a piperazine group, a tetrahydropyrazine group, a dihydropyrazine group, a tetrahydropyridazine group or a dihydropyridazine group,

[0384] the group T3 is a furan group, a thiophene group, a 1H-pyrrole group, a silole group or a borole group,

[0385] the group T4 can be a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, a thiadiazole group, an azapyrimidine group, an azaborole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group or a tetrazine group.

[0386] In this specification, To as the term cyclic group, C3-C 60 carbocyclic group, C1-C 60 heterocyclic group, π-electron rich C3-C 60 cyclic group or π-electron poor nitrogen-containing C1-C 60 cyclic group, the structure of the chemical formula according to which the respective term is used Andmay be a group condensed to any cyclic group, a monovalent group, or a polyvalent group (e.g., a divalent group, a trivalent group, a tetravalent group, etc.). For example, a "phenyl group" can be a benzene ring, a phenyl group, a phenylene group, etc., which can be easily understood by a person skilled in the art from the structure of the chemical formula including the "phenyl group".

[0387] For example, a monovalent C3-C 60 Examples of the carbon ring group and the monovalent C1-C 60 Examples of the heterocyclic group can include, for example, C3-C 10 Examples of the cycloalkyl group, C1-C 10 Examples of the heterocycloalkyl group, C3-C 10 Examples of the cycloalkenyl group, C1-C 10 Examples of the heterocycloalkenyl group, C6-C 60 Examples of the aryl group, C1-C 60 Examples of the heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, a divalent C3-C 60 Examples of the carbon ring group and the divalent C1-C 60 Examples of the heterocyclic group can include C3-C 10 Examples of the cycloalkylene group, C1-C 10 Examples of the heterocycloalkylene group, C3-C 10 Examples of the cycloalkenylene group, C1-C 10 Examples of the heterocycloalkenylene group, C6-C 60 Examples of the arylene group, C1-C 60 Examples of the heteroarylene group, a divalent non-aromatic condensed polycyclic group, and a divalent non-aromatic condensed heteropolycyclic group.

[0388] In the present specification, C1-C 60 An alkyl group represents a straight-chain or branched aliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, a t-pentyl group, a neopentyl group, an iso-pentyl group, a sec-pentyl group, a 3-pentyl group, a sec-iso-pentyl group, an n-hexyl group, an iso-hexyl group, a sec-hexyl group, a t-hexyl group, an n-heptyl group, an iso-heptyl group, a sec-heptyl group, a t-heptyl group, an n-octyl group, an iso-octyl group, a sec-octyl group, a t-octyl group, an n-nonyl group, an iso-nonyl group, a sec-nonyl group, a t-nonyl group, an n-decyl group, an iso-decyl group, a sec-decyl group, a t-decyl group, and the like. In the present specification, C1-C 60 An alkylene group represents a divalent group having the same structure as the C1-C 60 An alkylene group represents a divalent group having the same structure as the C1-C

[0389] In the present specification, C2-C 60 An alkenyl group represents a monovalent hydrocarbon group having one or more carbon-carbon double bonds in the middle or at the end of the C2-C 60 An alkenyl group represents a monovalent hydrocarbon group having one or more carbon-carbon double bonds in the middle or at the end of the C2-C60 The sub-alkenyl group represents the C2-C 60 Alkenes have divalent groups with the same structure.

[0390] In this instruction manual, C2-C 60 The alkynyl group is represented at C2-C. 60 Alkyl groups, either in the middle or at the end, include one or more monovalent hydrocarbon groups with a carbon-carbon triple bond; specific examples include ethynyl and propynyl groups. In this specification, C2-C... 60 The alkynyl group indicates that it is related to the C2-C 60 The alkynyl group is a divalent group with the same structure.

[0391] In this specification, C1-C 60 Alkyl groups indicate the presence of -OA 101 (Here, A) 101 For the C1-C 60 Alkyl groups are monovalent groups in the chemical formula of alkyl groups, and specific examples include methoxy, ethoxy, and isopropoxy groups.

[0392] In this instruction manual, C3-C 10 Cycloalkyl refers to a monovalent saturated hydrocarbon cyclic group with 3 to 10 carbon atoms. Specific examples include propyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantanyl, norbornanyl (or bicyclo[2.2.1]heptyl), bicyclo[1.1.1]pentyl, bicyclo[2.1.1]hexyl, bicyclo[2.2.2]octyl, etc. In this specification, C3-C 10 Cycloalkylene indicates that it is related to the C3-C 10 Cycloalkyl groups have the same divalent structure.

[0393] In this specification, C1-C 10 Heterocyclic alkyl groups refer to monovalent cyclic groups having 1 to 10 carbon atoms, in addition to carbon atoms, as at least one heteroatom serving as a cyclic atom. Specific examples include 1,2,3,4-oxatriazolidinyl, tetrahydrofuranyl, and tetrahydrothiophenyl. In this specification, C1-C... 10 Heterocyclic alkyl groups represent those with C1-C... 10 Heterocyclic alkyl groups have divalent groups with the same structure.

[0394] In this instruction manual, C3-C 10Cycloalkenyl groups are monovalent cyclic groups with 3 to 10 carbon atoms, representing groups having at least one carbon-carbon double bond within the ring but lacking aromaticity. Specific examples include cyclopentenyl, cyclohexenyl, and cycloheptenyl. In this specification, C3-C... 10 Cycloalkylene groups represent the C3-C group. 10 Cycloalkenyl groups are divalent groups with the same structure.

[0395] In this specification, C1-C 10 Heterocyclic alkenyl groups refer to monovalent cyclic groups with 1 to 10 carbon atoms, including at least one heteroatom as a cyclic atom in addition to carbon atoms, and having at least one double bond within the ring. The C1-C 10 Specific examples of heterocyclic alkenyl groups include 4,5-dihydro-1,2,3,4-oxarizolyl, 2,3-dihydrofuranyl, and 2,3-dihydrothiopheneyl. In this specification, C1-C... 10 Heterocyclic alkenyl groups represent the C1-C... 10 Heterocyclic alkenyl groups are divalent groups with the same structure.

[0396] In this instruction manual, C6-C 60 Aryl groups represent monovalent groups in a carbocyclic aromatic system having 6 to 60 carbon atoms, C6-C. 60 A aryl group refers to a divalent group in a carbocyclic aromatic system having 6 to 60 carbon atoms. The C6-C... 60 Specific examples of aryl groups include phenyl, cyclopentadienyl, naphthyl, chamomilecycloyl, indoleyl, acenaphthel, phenanthyl, anthracene, fluoranthyl, benzo[9,10]phenanthyl, pyrene, Compounds, perylene, pentylenyl, hepta-enyl, tetraphenyl, fraxyl, hexaphenyl, pentaphenyl, rubidylene, benzoyl, ovoxyl, etc. In the C6-C... 60 Aryl and C6-C 60 When a aryl group comprises two or more rings, the two or more rings can be condensed together.

[0397] In this specification, C1-C 60 A heteroaryl group is a monovalent group in a heterocyclic aromatic system that, in addition to a carbon atom, includes at least one heteroatom as a cyclic atom and has 1 to 60 carbon atoms, C1-C. 60 A heteroaryl group refers to a divalent group in a heterocyclic aromatic system that, in addition to a carbon atom, includes at least one heteroatom as a cyclic atom and has 1 to 60 carbon atoms. The C1-C 60Specific examples of the heteroaryl group include a pyridyl group, a pyrimidyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolyl group, a benzoquinolyl group, an isoquinolyl group, a benzoisoquinolyl group, a quinoxalyl group, a benzoquinoxalyl group, a quinazolyl group, a benzoquinazolyl group, a cinnolinyl group, a phenanthrolinyl group, a phthalazinyl group, a naphthyridinyl group, and the like. In the C1-C 60 heteroaryl group and a C1-C 60 In the case where the heteroarylene group has two or more rings, the two or more rings can be condensed with each other.

[0398] In the present specification, the monovalent non-aromatic condensed polycyclic group means a monovalent group (having 8 to 60 carbon atoms, for example) in which two or more rings are condensed with each other, and which includes only carbon atoms as ring-forming atoms and has non-aromaticity as a whole molecule. Specific examples of the monovalent non-aromatic condensed polycyclic group include an indenyl group, a fluorenyl group, a spirobifluorenyl group, a benzofluorenyl group, an indenophenanthryl group, an indenanthryl group, and the like. In the present specification, the divalent non-aromatic condensed polycyclic group means a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group.

[0399] In the present specification, a monovalent non-aromatic condensed heteropolycyclic group represents a monovalent group (for example, having a carbon atom number of 1 to 60) in which two or more rings are condensed to each other, and which includes at least one hetero atom as a ring-forming atom in addition to carbon atoms, and which is non-aromatic as a whole molecule. Specific examples of the monovalent non-aromatic condensed heteropolycyclic group include a pyrrolyl group, a thienyl group, a furanyl group, an indolyl group, a benzoindolyl group, a naphthoindolyl group, an isoindolyl group, a benzoisoindolyl group, a naphthoisoindolyl group, a benzothiophenyl group, a benzothienyl group, a benzofuranyl group, a carbazolyl group, a dibenzothiophenyl group, a dibenzothiophyl group, a dibenzofuranyl group, an azacarbazolyl group, an azafuorenyl group, an azadibenzothiophenyl group, an azadibenzothiophyl group, an azadibenzofuranyl group, a pyrazolyl group, an imidazolyl group, a triazolyl group, a tetrazolyl group, an oxazolyl group, an isoxazolyl group, a thiazolyl group, an isothiazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzopyrazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzothiazolyl group, a benzoxadiazolyl group, a benzothiadiazolyl group, an imidazopyridyl group, an imidazopyrimidyl group, an imidazotriazinyl group, an imidazopyrazinyl group, an imidazopyridazinyl group, an indenocarbazolyl group, an indolocarbazolyl group, a benzofuranocarbazolyl group, a benzothienocarbazolyl group, a benzothianocarbazolyl group, a benzoindeocarbazolyl group, a benzo-carbazolyl group, a benzonaphthofuranyl group, a benzonaphthothienyl group, a benzonaphthothianolyl group, a benzofuranodibenzofuranyl group, a benzofuranodibenzothienyl group, a benzothienodibenzothienyl group, and the like. In the present specification, a divalent non-aromatic condensed heteropolycyclic group represents a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

[0400] In the present specification, a C6-C 60 Aryloxy represents -OA 102 (wherein A 102 is the C6-C 60 aryl group), the C6-C 60 Arylthio represents -SA 103 (wherein A 103 is the C6-C 60 aryl group).

[0401] In the present specification, "R 10a " can be:

[0402] deuterium (-D), -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, or a nitro group;

[0403] deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C3-C 60 carbocyclic group, a C1-C 60 heterocyclic group, a C6-C 60Aryloxy group, C6-C 60 Arylthioyl, -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 of the above groups substituted or unsubstituted C1-C) 60 Alkyl, C2-C 60 alkenyl, C2-C 60 alkynyl or C1-C 60 Alkoxy;

[0404] The radicals -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 groups, C1-C 60 Heterocyclic groups, C6-C 60 Aryloxy group, C6-C 60 Arylthioyl, -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 of the above groups substituted or unsubstituted C3-C 60 Carbocyclic groups, C1-C 60 Heterocyclic groups, C6-C 60 Aryloxy or C6-C 60 aryl thiols; or

[0405] -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 ).

[0406] In the present specification, Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 may be independently of one another hydrogen; deuterium; -F; -Cl; -Br; -I; a hydroxyl group; a cyano group; a nitro group; a C1-C 60 alkyl group; a C2-C 60 alkenyl group; a C2-C 60 alkynyl group; a C1-C 60 alkoxy group; a C3-C 60 carbocyclic group or a C1-C 60 heterocyclic group, which is substituted or unsubstituted. 60 60

[0407] In the present specification, a heteroatom means any atom other than a carbon atom. Examples of the heteroatom include O, S, N, P, Si, B, Ge, Se, or any combination thereof.

[0408] In the present specification, a third-row transition metal includes hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), or the like.

[0409] In the present specification, "Ph" means a phenyl group, "Me" means a methyl group, "Et" means an ethyl group, "tert-Bu" or "Bu t " means a tert-butyl group, and "OMe" means a methoxy group.

[0410] In the present specification, "biphenyl" means "a phenyl group substituted with a phenyl group". The "biphenyl" belongs to "a substituted phenyl group" in which a substituent is "a C6-C 60 aryl group".

[0411] In the present specification, "terphenyl" means "a phenyl group substituted with a biphenyl group". The "terphenyl" belongs to "a substituted phenyl group" in which a substituent is "a C6-C 60 aryl group" substituted with a C6-C 60 aryl group". ​​

[0412] In the definition of substituents, the maximum number of carbon atoms is illustrative. For example, in the case of C1-C6alkyl, the maximum number of carbon atoms is 6, and the same applies to C1-C6alkyl for the definition of C1-C6alkyl. The same applies to other cases. 60 In the case of C1-C6alkyl, the maximum number of carbon atoms is 6, and the same applies to C1-C6alkyl for the definition of C1-C6alkyl. The same applies to other cases. 20 In the case of C1-C6alkyl, the maximum number of carbon atoms is 6, and the same applies to C1-C6alkyl for the definition of C1-C6alkyl. The same applies to other cases.

[0413] In the present specification, unless otherwise defined, and'indicates the binding site with the adjacent atom in the corresponding chemical formula.

[0414] Hereinafter, compounds and light-emitting elements according to an embodiment of the present application are described more specifically by exemplifying examples.

[0415] [Examples]

[0416] Hansen parameter values

[0417] In Table 1 below, the values of the Hansen parameter are shown for compounds 1 to 4 as the first solvent, compounds 51 to 54 as the second solvent, the mixed solvent of the first solvent compound and the second solvent compound, and compounds 101 to 107 as the phosphine oxide-based charge-transporting organic substance.

[0418] [Table 1]

[0419] Compound [dP(MPa 0.5 )]]> [dH(MPa 0.5 )]]> 1 11.0 26.0 2 10.2 22.1 3 11.0 20.6 4 10.6 17.7 51 7.0 10.6 52 5.5 10.7 53 6.1 9.1 54 6.1 10.2 1 & 52 (8:2 volume ratio) 10.5 24.5 4 & 51 (8:2 volume ratio) 9.2 15.6 1 & 51 (8:2 volume ratio) 10.7 24.7 101 14.0 7.3 102 13.4 9.0 103 13.3 7.9 104 15.2 9.9 105 14.7 5.9 106 9.1 6.2 107 14.2 8.5 Triethylene glycol monobutyl ether (TEGBE) 6.1 9.1

[0420] Properties of solvents

[0421] In Table 2 below, the values of the boiling point (b.p.), the viscosity, and the surface tension are shown for compounds 1 to 4 as the first solvent and compounds 51 to 54 as the second solvent.

[0422] [Table 2]

[0423]

[0424] Preparation of ink composition

[0425] Ink composition for electron transport layer

[0426] An ink composition for an electron transport layer was prepared with the composition of Table 3 below.

[0427] [Table 3]

[0428]

[0429]

[0430] 1) Weight % of solute based on 100 of the ink composition as a whole

[0431] 2) weight ratio

[0432] Ink composition for light emitting layer

[0433] An ink composition for a light-emitting layer was prepared with the composition of Table 4 below.

[0434]

Table 4

[0435]

[0436]

[0437] 3) weight % of solute based on 100 of the ink composition as a whole

[0438]

[0439]

[0440] Lower film damage evaluation

[0441] Damage to the lower film coated with the ink composition for a light-emitting element was evaluated according to the following order.

[0442] 1) Glass substrate: a substrate for preparing a single film of an emitting layer (EML) was prepared

[0443] 2) EML coating: spin coating was performed on the glass in a manner matching the target thickness of the corresponding ink (according to the thickness deviation of the test piece Spec < ± 3%), and baking was performed at 140°C for 10 minutes

[0444] 3) determination of UV absorbance of EML: the UV absorption spectrum of the central portion of the EML single film was measured by coating a total of 10 or more pieces, and the absorbance of UV abs. λmax was set to 100 (initial state)

[0445] 4) solvent drop: 50 mg of a mixed solvent of the first solvent and the second solvent was dropped at the center of the EML single film using a syringe

[0446] 5) standing: standing was performed in a hood under conditions such that the mixed solvent droplet did not move or flow (30 minutes)

[0447] 6) removal of mixed solvent: the mixed solvent was removed using a PET material ultra-fine fiber wiper with a fiber diameter of 20 μm or less (wiper standing time 10 seconds)

[0448] 7) Baking: Baking was performed at 110°C for 15 minutes using a hot plate

[0449] 8) Measurement of UV absorbance: The difference in UV abs. λmax absorbance was measured, and the relative absorbance was shown in % when the initial absorbance was set to 100 (Example: In the case of initial absorbance 10 / absorbance after treatment 9, it was calculated as 90%)

[0450] [Example 1-1]

[0451] After spin coating B EML-1 on a glass substrate (50 x 50 mm) to form a film of 100 nm thickness, the degree of damage to the lower film was evaluated according to the lower film damage evaluation method. The mixed solvent was Compound 1: Compound 52 (8:2 by volume).

[0452] [Example 1-2]

[0453] The same method as Example 1-1 was performed except that B EML-1 was replaced with G EML-1.

[0454] [Example 1-3]

[0455] The same method as Example 1-1 was performed except that B EML-1 was replaced with R EML-1.

[0456] [Example 1-4]

[0457] The same method as Example 1-1 was performed except that the mixed solvent was changed from Compound 1: Compound 52 (8:2 by volume) to Compound 4: Compound 51 (8:2 by volume).

[0458] [Example 1-5]

[0459] The same method as Example 1-4 was performed except that B EML-1 was replaced with G EML-1.

[0460] [Example 1-6]

[0461] The same method as Example 1-4 was performed except that B EML-1 was replaced with R EML-1.

[0462] [Comparative Example 1-1]

[0463] The same method as Example 1-1 was performed except that B EML-1 was replaced with B EML-2.

[0464] [Comparative Example 1-2]

[0465] The same procedure as in Example 1-1 was conducted except that B EML-1 was replaced with G EML-2.

[0466] [Comparative Example 1-3]

[0467] The same procedure as in Example 1-1 was conducted except that B EML-1 was replaced with R EML-2.

[0468] [Comparative Example 1-4]

[0469] The same procedure as in Example 1-1 was conducted except that the mixed solvent of Compound 1:Compound 52 (8:2 by volume) was replaced with Compound 1:Compound 51 (8:2 by volume).

[0470] [Comparative Example 1-5]

[0471] The same procedure as in Example 1-2 was conducted except that the mixed solvent of Compound 1:Compound 52 (8:2 by volume) was replaced with Compound 1:Compound 51 (8:2 by volume).

[0472] [Comparative Example 1-6]

[0473] The same procedure as in Example 1-3 was conducted except that the mixed solvent of Compound 1:Compound 52 (8:2 by volume) was replaced with Compound 1:Compound 51 (8:2 by volume).

[0474] [Comparative Example 1-7]

[0475] The same procedure as in Example 1-1 was conducted except that the mixed solvent of Compound 1:Compound 52 (8:2 by volume) was replaced with a single solvent, triethylene glycol monobutyl ether (TEGBE).

[0476] The absorbance difference is shown in Table 5 below.

[0477]

Table 5

[0478] UV absorbance difference (%) Example 1-1 99 Example 1-2 98 Example 1-3 100 Example 1-4 97 Example 1-5 98 Example 1-6 99 Comparative Example 1-1 17 Comparative Example 1-2 20 Comparative Example 1-3 22 Comparative Example 1-4 55 Comparative Example 1-5 39 Comparative Example 1-6 42 Comparative Example 1-7 35

[0479] The smaller the absorbance difference, the greater the damage to the lower film.

[0480] In the case of Comparative Examples 1-1 to 1-3, damage caused by the solvent occurred due to the presence of a compound having a molecular weight of less than 640 in the light-emitting layer.

[0481] Comparative Examples 1-4 to 1-6 are cases where the difference between the boiling points of the first solvent and the second solvent constituting the mixed solvent is greater than 10°C, and it is known that the damage to the lower film is greater than in the case where the difference between the boiling points of the first solvent and the second solvent is 10°C or less.

[0482] Comparative Example 1-7 is a case where a single solvent is used, and it is known that the damage to the lower film is greater than in the case where a mixed solvent of a first solvent and a second solvent is used.

[0483] Manufacture of light emitting element

[0484] Example 2-1

[0485] After the ITO glass substrate (50 x 50 mm, 15 Ω / D) as an OLED glass (Samsung-Corning product) substrate was subjected to ultrasonic washing using distilled water and isopropyl alcohol in this order, 30-minute UV ozone washing was performed.

[0486] After spin coating PEDOT:PSS on the washed transparent electrode line-attached glass substrate to form a film having a thickness of 60 nm, a hole injection layer was formed by baking at 200°C for 30 minutes.

[0487] After spin coating TFB on the hole injection layer to form a film having a thickness of 20 nm, a hole transport layer was formed by baking at 240°C for 10 minutes.

[0488] After spin coating BEML-1 ink composition on the hole transport layer to form a film having a thickness of 30 nm, a light-emitting layer was formed by baking at 140°C for 10 minutes.

[0489] An electron transport layer was formed by spin coating ETL-1 ink composition on the light-emitting layer to a thickness of 20 nm.

[0490] A cathode was formed by depositing Al on the electron transport layer to a thickness of 100 nm, thereby manufacturing an organic light-emitting element.

[0491] The apparatus used for deposition was a Suicel plus 200 depositor of Sunic system Co.

[0492]

[0493] TFB (n: 100 ~ 100,000)

[0494] Examples 2-2 to 2-21

[0495] In the formation of the light-emitting layer and the electron transport layer, an organic light-emitting element was manufactured in the same manner as in Example 2-1, except that the ink composition of Table 6 below was used.

[0496] Comparative Examples 2-1 to 2-7

[0497] The light-emitting element was produced in the same manner as in Example 2-1, except that the ink composition of Table 6 below was used in forming the light-emitting layer and the electron-transport layer.

[0498]

Table 6

[0499] Ink composition for light emitting layer Ink composition for electron transport layer Example 2-1 B EML-1 ETL-1 Example 2-2 B EML-1 ETL-2 Example 2-3 B EML-1 ETL-3 Example 2-4 B EML-1 ETL-4 Example 2-5 B EML-1 ETL-5 Example 2-6 B EML-1 ETL-6 Example 2-7 B EML-1 ETL-7 Example 2-8 G EML-1 ETL-1 Example 2-9 G EML-1 ETL-2 Example 2-10 G EML-1 ETL-3 Example 2-11 G EML-1 ETL-4 Example 2-12 G EML-1 ETL-5 Example 2-13 G EML-1 ETL-6 Example 2-14 G EML-1 ETL-7 Example 2-15 R EML-1 ETL-1 Example 2-16 R EML-1 ETL-2 Example 2-17 R EML-1 ETL-3 Example 2-18 R EML-1 ETL-4 Example 2-19 R EML-1 ETL-5 Example 2-20 R EML-1 ETL-6 Example 2-21 R EML-1 ETL-7 Comparative Example 2-1 B EML-2 ETL-1 Comparative Example 2-2 G EML-2 ETL-1 Comparative Example 2-3 R EML-2 ETL-1 Comparative Example 2-4 B EML-1 ETL-8 Comparative Example 2-5 G EML-1 ETL-8 Comparative Example 2-6 R EML-1 ETL-8 Comparative Example 2-7 B EML-1 ETL-11

[0500] The driving voltage, efficiency, color purity of the organic light-emitting elements produced in Examples 2-1 to 2-21 and Comparative Examples 2-1 to 2-7 were measured by the following method, and the results thereof are shown in Table 7.

[0501] - Color coordinates: measured by a luminance meter PR650, supplied with power by a current-voltage meter (Kethley SMU 236).

[0502] - Luminance: measured by a luminance meter PR650, supplied with power by a current-voltage meter (Kethley SMU 236).

[0503] - Efficiency: measured by a luminance meter PR650, supplied with power by a current-voltage meter (Kethley SMU 236).

[0504] T95 of lifetime shows the time (hr) required for the luminance to become 95% when the initial luminance (at 10 mA / cm 2 ) is set to 100%.

[0505]

Table 7

[0506]

[0507]

[0508] From the Table 7, it can be confirmed that the light-emitting elements of Examples 2-1 to 2-7 show more excellent results in efficiency and lifetime than those of Comparative Examples 2-1 and 2-4, the light-emitting elements of Examples 2-8 to 2-14 show more excellent results in efficiency and lifetime than those of Comparative Examples 2-2 and 2-5, and the light-emitting elements of Examples 2-15 to 2-21 show more excellent results in efficiency and lifetime than those of Comparative Examples 2-3 and 2-6. It can be confirmed that the case of Comparative Example 2-7 using a single solvent shows lower efficiency and lifetime than those of Example 2-1.

[0509] In the case where the ink composition according to an embodiment of the present application is used in a solution process, the effect of laminating two layers by a baking process using one ink composition can be obtained.

[0510] Further, by imparting solvent selectivity, it is possible to perform lamination using another ink composition in the upper portion, and thus an organic light emitting element exhibiting high efficiency and long life characteristics can be realized. Furthermore, it is also useful for application to a full-color display based on this.

Claims

1. An ink composition for a light-emitting element, comprising: Phosphine oxides are charge-transporting organic compounds; The first solvent of chemical formula 1; as well as The second solvent of chemical formula 2, <Chemical Formula 1> HOR1(O) m R2OH In the chemical formula 1, R1 and R2 independently represent C1-C2. 60 Alkylene, C3-C 10 Cycloalkylene or C1-C 10 Heterocyclic alkyl groups, m represents 0 or 1. <Chemical Formula 2> (HO) a R 11 O(R 12 O) n R 13 (OH) b In the chemical formula 2, R 11 To R 13 C1-C are represented independently of each other. 60 Alkyl, C1-C 60 Alkylene, C3-C 10 cycloalkyl, C3-C 10 Cycloalkylene, C1-C 10 Heterocyclic alkyl or C1-C 10 Heterocyclic alkyl groups, n represents an integer from 0 to 5. a and b independently represent 0 or 1, and the sum of a and b is 1. The difference in boiling points between the first solvent and the second solvent is less than 10°C.

2. The ink composition for light-emitting elements as described in claim 1, wherein, The charge-transporting organics are electron-transporting organics.

3. The ink composition for light-emitting elements as described in claim 1, wherein, The dP value of the Hansen parameter of the mixed solvent of the first solvent and the second solvent is 9 or higher.

4. The ink composition for light-emitting elements as described in claim 1, wherein, The dH value of the Hansen parameter of the mixed solvent of the first solvent and the second solvent is 9 or higher.

5. The ink composition for light-emitting elements as described in claim 1, wherein, The viscosity of the mixture of the first solvent and the second solvent at room temperature is below 30 cp.

6. The ink composition for light-emitting elements as claimed in claim 1, wherein, The surface tension of the mixture of the first solvent and the second solvent is 30 dyn / cm to 38 dyn / cm.

7. The ink composition for light-emitting elements as claimed in claim 1, wherein, The dP value of the Hansen parameter of the phosphine oxide-based charge-transporting organic compound is 9 or higher.

8. The ink composition for light-emitting elements as claimed in claim 1, wherein, The dH value of the Hansen parameter of the phosphine oxide-based charge-transporting organic compound is 5 or higher.

9. The ink composition for light-emitting elements as claimed in claim 1, wherein, The first solvent of Formula 1 comprises any one of the following compounds: [Compound 1] [Compound 2] [Compound 3] [Compound 4].

10. The ink composition for a light-emitting element as claimed in claim 1, wherein, The second solvent of chemical formula 2 is represented by chemical formula 2-1, chemical formula 2-2, or chemical formula 2-3: <Chemical Formula 2-1> <Chemical Formula 2-2> <Chemical Formula 2-3> Among them, in chemical formula 2-1, chemical formula 2-2, and chemical formula 2-3, regarding R 11 R 13 The definitions of a, b, and n are the same as those in chemical formula 2.

11. The ink composition for a light-emitting element as claimed in claim 1, wherein, The phosphine oxide-based charge-transporting organic compounds include any one of the following compounds: [Compound 101] [Compound 102] [Compound 103] [Compound 104] [Compound 105] [Compound 106] [Compound 107].

12. A light-emitting element, comprising: First electrode; The second electrode is opposite to the first electrode; as well as An intermediate layer, sandwiched between the first electrode and the second electrode, includes a light-emitting layer. Any layer in the intermediate layer is manufactured using a method for manufacturing a light-emitting element ink composition comprising the following substances: Phosphine oxides are charge-transporting organic compounds; The first solvent of chemical formula 1; and The second solvent of chemical formula 2, <Chemical Formula 1> HOR1(O) m R2OH In the chemical formula 1, R1 and R2 independently represent C1-C2. 60 Alkylene, C3-C 10 Cycloalkylene or C1-C 10 Heterocyclic alkyl groups, m represents 0 or 1. <Chemical Formula 2> (HO) a R 11 O(R 12 O) n R 13 (OH) b In the chemical formula 2, R 11 To R 13 C1-C are represented independently of each other. 60 Alkyl, C1-C 60 Alkylene, C3-C 10 cycloalkyl, C3-C 10 Cycloalkylene, C1-C 10 Heterocyclic alkyl or C1-C 10 Heterocyclic alkyl groups, where n represents an integer from 0 to 5. a and b independently represent 0 or 1, the sum of a and b is 1, and the difference in boiling points between the first solvent and the second solvent is less than 10°C.

13. The light-emitting element as claimed in claim 12, wherein, The arbitrary layer is an electron transport layer.

14. The light-emitting element as claimed in claim 12, wherein, The manufacturing method is based on inkjet printing.

15. The light-emitting element as claimed in claim 12, wherein, The light-emitting layer is in contact with the arbitrary layer.

16. The light-emitting element as claimed in claim 12, wherein, The light-emitting layer comprises a host and a dopant. The molecular weight of the host and the molecular weight of the dopant are both 640 or higher.

17. The light-emitting element as claimed in claim 12, wherein, The ink composition for the light-emitting element also includes a metallic substance.

18. The light-emitting element as claimed in claim 12, wherein, The intermediate layer also includes a hole injection layer and a hole transport layer. The hole injection layer, the hole transport layer, and the light-emitting layer are prepared by a solution process.

19. An electronic device comprising: The light-emitting element according to any one of claims 12 to 18.

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