KR20230077652A - Light-emitting device and electronic apparatus including the same - Google Patents

Abstract

Disclosed are a light emitting element and an electronic device comprising the same. The light emitting element comprises: a first pixel electrode, a second pixel electrode, and a third pixel electrode disposed in each of a first light emitting area, a second light emitting area, and a third light emitting area; an opposite electrode opposing the first pixel electrode, the second pixel electrode, and the third pixel electrode; and an intermediate layer disposed between the first pixel electrode, the second pixel electrode, the third pixel electrode, and the opposite electrode. Therefore, the present invention is capable of providing the light emitting element having high efficiency and long lifespan.

Description

Light-emitting device and electronic device including the same {Light-emitting device and electronic apparatus including the same}

It relates to a light emitting element and an electronic device including the same.

Among the light emitting devices, the self-emitting device has a wide viewing angle and excellent contrast, a fast response time, and excellent luminance, driving voltage, and response speed characteristics.

The light emitting device has a first electrode disposed on a substrate, and a hole transport region, a light emitting layer, an electron transport region, and a second electrode are sequentially disposed on the first electrode. can have a structure. Holes injected from the first electrode move to the light emitting layer via the hole transport region, and electrons injected from the second electrode move to the light emitting layer via the electron transport region. Carriers such as holes and electrons recombine in the light emitting layer region to generate excitons. Light is generated as the exciton changes from an excited state to a ground state.

It is to provide a light emitting device having a low driving voltage, high efficiency and long lifespan.

According to one aspect,

a first pixel electrode, a second pixel electrode, and a third pixel electrode disposed in the first light emitting area, the second light emitting area, and the third light emitting area, respectively;

a counter electrode facing the first pixel electrode, the second pixel electrode, and the third pixel electrode; and

an intermediate layer disposed between the first pixel electrode, the second pixel electrode and the third pixel electrode and the counter electrode;

including,

The intermediate layer includes a light emitting layer and an electron transport region disposed between the light emitting layer and the counter electrode,

The light emitting layer,

a first light emitting layer disposed corresponding to the first light emitting region and emitting a first color light;

a second light emitting layer disposed to correspond to the second light emitting region and emitting a second color light; and

a third light emitting layer disposed corresponding to the third light emitting region and emitting a third color light; including,

The electron transport region includes an electron transport layer,

The electron transport layer includes a mixture of a first material, a second material, and a third material,

The first material includes an electron transport compound,

The second material includes a metal-containing compound,

The third material includes a low refractive index compound,

The first material, the second material and the third material are different from each other, a light emitting element is provided.

According to another aspect, an electronic device including the light emitting device is provided.

According to an embodiment of the present invention, a light emitting device having a low driving voltage, high efficiency, and long lifespan can be implemented by introducing an electron transport layer including a mixture of the first material, the second material, and the third material.

1 schematically illustrates a cross-sectional view of a light emitting device according to an embodiment.
2 and 3 are cross-sectional views of a light emitting device according to one embodiment, respectively.
4 is a graph measuring refractive indices according to wavelengths for ETLs A to E according to Evaluation Example 1;
5A to 5C are graphs showing simulation values of luminous efficiency of a light emitting device including ETL D and ETL E in red, green, and blue wavelength regions, respectively, according to Evaluation Example 2;

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and methods for achieving them will become clear with reference to the embodiments described later in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, the same or corresponding components are assigned the same reference numerals, and overlapping descriptions thereof will be omitted. .

In the following embodiments, terms such as first and second are used for the purpose of distinguishing one component from another component without limiting meaning.

In the following examples, expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have mean that features or components described in the specification exist, and do not preclude the possibility that one or more other features or components may be added.

In the following embodiments, when various elements such as layers, films, regions, and plates are said to be “on” other elements, this is not only when they are “directly on” other elements, but also when other elements are interposed therebetween. Including cases where In addition, for convenience of description, the size of components may be exaggerated or reduced in the drawings. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated bar.

In the present invention, the refractive index of the material and the refractive index of the layer may be referred to as described later, but is not limited thereto.

The refractive index of the material was measured at 25 °C using an ellipsometry instrument. After the light from the light source passes through the polarizer and hits the sample, the reflected light is detected to measure the phase, polarization direction, and intensity of the light. Through this, the birefringence of the material can be extracted. The refractive index of the mixed film was measured using the same method after actually depositing the mixed film.

According to one embodiment, the light emitting device of the present application includes a first pixel electrode, a second pixel electrode, and a third pixel electrode disposed in the first light emitting region, the second light emitting region, and the third light emitting region, respectively; a counter electrode facing the first pixel electrode, the second pixel electrode, and the third pixel electrode; and

and an intermediate layer disposed between the first pixel electrode, the second pixel electrode, and the third pixel electrode and the counter electrode.

1 is a cross-sectional view of a light emitting device according to an embodiment of the present invention.

[Description of Figure 1]

Referring to FIG. 1 , a structure of a light emitting device 1 according to an exemplary embodiment will be described in detail.

[Pixel electrodes 111, 112, 113]

The light emitting element 1 includes a first pixel electrode 111, a second pixel electrode 112, and a third pixel electrode 113 disposed in the first light emitting region, the second light emitting region, and the third light emitting region, respectively. .

The first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 may each be formed as a transmissive, transflective, or reflective electrode.

For example, the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 may be formed as reflective electrodes.

When the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 are transmissive electrodes, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO ₂ ), Zinc oxide (ZnO), or any combination thereof, may be used.

When the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 are reflective electrodes, the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode (113) is magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag) , or any combination thereof.

The first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 may be formed of various materials other than the above-described materials, and may have a single-layer structure that is a single layer or a multi-layer structure that has a plurality of layers. can have

The first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 may be disposed on a substrate (not shown).

As the substrate, a glass substrate or plastic substrate having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water resistance may be used. For example, as the substrate, a glass substrate or a plastic substrate can be used. Alternatively, the substrate may be a flexible substrate, for example, polyimide, polyethylene terephthalate (PET), polycarbonate, polyethylene naphtalate, polyarylate ( PAR; polyarylate), polyetherimide, or any combination thereof, such as a plastic having excellent heat resistance and durability.

For example, in the case of a bottom emission type in which light from the emission layers 131, 132, and 133 is emitted toward the substrate, the substrate may be transparent.

As another example, in the case of a top emission type in which light from the emission layers 131, 132, and 133 is emitted in a direction opposite to the substrate, the substrate is not necessarily transparent and may be opaque or translucent.

According to an embodiment, the light emitting layers 131, 132, and 133 may be of a top emission type in which light is emitted in a direction opposite to that of the substrate.

Although omitted in FIG. 1 , a buffer layer, a thin film transistor, an organic insulating layer, and the like may be further included between the substrate and the first pixel electrode 111 , the second pixel electrode 112 , and the third pixel electrode 113 .

[counter electrode 150]

The light emitting element 1 includes a counter electrode 150 facing the first pixel electrode 111 , the second pixel electrode 112 , and the third pixel electrode 113 .

The counter electrode 150 may include a first counter electrode area corresponding to the first light emitting area, a second counter electrode area corresponding to the second light emitting area, and a third counter electrode area corresponding to the third light emitting area.

The counter electrode 150 may be a cathode, which is an electron injection electrode. In this case, as a material for the second electrode 150, a metal, an alloy, an electrically conductive compound having a low work function, or any of these materials is used. combinations can be used.

The counter electrode 150 may be formed as a transmissive, transflective or reflective electrode.

The counter electrode 150 is lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium - It may include silver (Mg-Ag), ytterbium (Yb), silver-ytterbium (Ag-Yb), ITO, IZO, or any combination thereof, but is not limited thereto.

The counter electrode 150 may be formed of various materials other than the above materials, and may have a single-layer structure of a single layer or a multi-layer structure of a plurality of layers.

According to one embodiment, the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 are anodes, the counter electrode 150 is a cathode, the anode is a reflective electrode, The cathode may be a transmissive electrode or a transflective electrode.

[middle layer]

The light emitting element 1 includes a first pixel electrode 111 , a second pixel electrode 112 , and an intermediate layer disposed between the third pixel electrode 113 and the counter electrode 150 .

The intermediate layer includes light emitting layers 131 , 132 , and 133 and an electron transport region 140 disposed between the light emitting layers 131 , 132 , 133 and the counter electrode 150 .

The intermediate layer is disposed between the light-emitting layers 131, 132, and 133 and the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 and the light-emitting layers 131, 132, and 133. A hole transport region 120 is included.

[Light-emitting layers (131, 132, 133) of intermediate layers]

The light-emitting layers 131, 132, and 133 are disposed to correspond to the first light-emitting area and emit first color light; a second light emitting layer 132 disposed to correspond to the second light emitting region and emitting second color light; and a third light emitting layer 133 disposed to correspond to the third light emitting region and emitting a third color light.

The maximum emission wavelength of the first color light, the maximum emission wavelength of the second color light, and the maximum emission wavelength of the third color light may all be different.

Each of the maximum emission wavelength of the first color light and the maximum emission wavelength of the second color light may be longer than the maximum emission wavelength of the third color light.

For example, the first color light may be red light, the second color light may be green light, and the third color light may be blue light, but is not limited thereto.

For example, the maximum emission wavelength of the first color light is selected from about 620 nm to about 750 nm; each of the maximum emission wavelengths of the second color light is selected from about 495 nm to about 570 nm; The maximum emission wavelength of the third color light may be selected from about 450 nm to about 495 nm, but is not limited thereto.

According to an embodiment, the first color light, the second color light, and the third color light may be emitted through secondary resonance.

A microresonant structure may be applied to the light emitting device in order to effectively emit light generated from the light emitting layer to the outside. For example, when light is repeatedly reflected between the counter electrode 150, which is a semi-transmissive layer, and the pixel electrodes 111, 112, and 113, which are a reflective layer, which are separated by an optical path length, constructive interference results in the transmission of a specific wavelength. Light is amplified, light of other wavelengths is canceled, and the amplified light can pass through the counter electrode 150, which is a semi-transmissive layer, and be emitted to the outside.

Each of the first light emitting region, the second light emitting region, and the third light emitting region includes a pixel electrode 111, 112, and 113, a hole transport region 120, a light emitting layer 131, 132, and 133, an electron transport region 140, and A counter electrode 150 is included. The front surface of the pixel electrodes 111, 112, and 113 of the first light emitting region, the second light emitting region, and the third light emitting region (upper surface facing the counter electrode) and the rear surface of the counter electrode 150 (pixel electrode and The distance between the upper surfaces in the facing direction) is defined as a resonance distance Lc, and the resonance distance Lc follows Equation 1 below.

<Equation 1>

Here, Nc is defined as the effective refractive index of the resonance structure, λ is the wavelength of light to be resonated, and k is defined as the resonance order. The resonance structure includes all intermediate layers disposed between the pixel electrodes 111 , 112 , and 113 and the counter electrode 150 .

The secondary resonance structure is a structure in which the resonance distance corresponds to the secondary resonance distance of the wavelength of emitted light, and k is 2 in Equation 1 above.

According to an embodiment, a first distance (L ₁ ) between a surface of the first counter electrode region in the direction of the first pixel electrode and a surface of the first pixel electrode 111 in the direction of the first counter electrode region is Corresponding to the secondary resonance distance of the first color light, a distance between a surface of the second counter electrode area in the direction of the second pixel electrode and a surface of the second pixel electrode 112 in the direction of the second counter electrode area 2 distance (L ₂ ) corresponds to the secondary resonance distance of the second color light, and the surface of the third counter electrode region in the direction of the third pixel electrode and the third counter electrode of the third pixel electrode 113 The third distance L ₃ between the planes in the area direction may correspond to the secondary resonance distance of the third color light.

In another embodiment, L ₁ , L ₂ and L ₃ may each satisfy Equations 1 to 3 below, but are not limited thereto.

<Equation 1>

L ₁ = λ ₁ / 2N ₁ x 2

<Equation 2>

L ₂ = λ ₂ / 2N ₂ ⅹ 2

<Equation 3>

L ₃ = λ ₃ / 2N ₃ ⅹ 2

In Formulas 1 to 3 above,

L ₁ is a distance between the first pixel electrode and the counter electrode;

L ₂ is a distance between the second pixel electrode and the counter electrode;

L ₃ is a distance between the third pixel electrode and the counter electrode;

λ ₁ is the maximum emission wavelength of the first color light;

λ ₂ is the maximum emission wavelength of the second color light;

λ ₃ is the maximum emission wavelength of the third color light;

N ₁ is a refractive index of an intermediate layer interposed between the first pixel electrode and the counter electrode;

N ₂ is a refractive index of an intermediate layer interposed between the second pixel electrode and the counter electrode;

N ₃ is a refractive index of an intermediate layer interposed between the third pixel electrode and the counter electrode.

In one embodiment, the L ₁ may be 2600 Å to 2800 Å, the L ₂ may be 2200 Å to 2400 Å, and the L ₃ may be 1700 Å to 1900 Å.

Hereinafter, each layer included in the intermediate layer of the light emitting element 1 will be described in more detail.

[hole transport region 120]

The hole transport region 120 may include i) a single layer structure consisting of a single material (consist of), ii) a single layer structure consisting of a plurality of different materials (consist of), or iii) It may have a multilayer structure including a plurality of layers including a plurality of different materials.

The hole transport region may include a hole injection layer, a hole transport layer, a light emitting auxiliary layer, an electron blocking layer, or any combination thereof.

For example, the hole transport region includes a hole injection layer/hole transport layer and a hole injection layer/hole transport layer sequentially stacked from the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113. / It may have a multi-layered structure of light emitting auxiliary layer, hole injection layer/light emitting auxiliary layer, hole transport layer/light emitting auxiliary layer, or hole injection layer/hole transport layer/electron blocking layer.

The hole transport region may include a compound represented by Chemical Formula 201, a compound represented by Chemical Formula 202, or any combination thereof:

<Formula 201>

<Formula 202>

In Chemical Formulas 201 and 202,

L ₂₀₁ to L ₂₀₄ are each independently a C ₃ -C ₆₀ carbocyclic group unsubstituted or substituted with at least one R _10a , or a C ₁ -C ₆₀ heterocyclic group optionally substituted with at least one R _10a . is a click group,

L ₂₀₅ is *-O-*', *-S-*', *-N(Q ₂₀₁ )-*', a C ₁ -C ₂₀ alkylene group unsubstituted or substituted with at least one R _10a , at least one of R _10a substituted or unsubstituted C ₂ -C ₂₀ alkenylene group, at least one R _10a substituted or unsubstituted C ₃ -C ₆₀ carbocyclic group, or at least one R _10a substituted or unsubstituted A C ₁ -C ₆₀ heterocyclic group,

xa1 to xa4 are each independently one of integers from 0 to 5;

xa5 is an integer from 1 to 10;

R ₂₀₁ to R ₂₀₄ and Q ₂₀₁ are each independently a C ₃ -C ₆₀ carbocyclic group optionally substituted with at least one R _10a , or a C ₁ -C optionally substituted with at least one R _{10a 60} heterocyclic group,

R ₂₀₁ and R ₂₀₂ are optionally a single bond, a C 1 -C 5 alkylene group optionally substituted with at least one R _10a , or a C ₂ -C ₅ optionally substituted with at least one R _10a substituted or unsubstituted C ₂ -C ₅ Linked to each other via an alkenylene group to form a C ₈ -C ₆₀ polycyclic group (eg, a carbazole group, etc.) unsubstituted or substituted with at least one R _10a (eg, the following compound HT16 see etc.),

R ₂₀₃ and R ₂₀₄ are optionally a single bond, a C ₁ -C ₅ alkylene group unsubstituted or substituted with at least one R _10a , or a C ₂ -C optionally substituted with at least one R _10a may be linked to each other through ₅ alkenylene groups to form a C ₈ -C ₆₀ polycyclic group unsubstituted or substituted with at least one R _10a ;

na1 may be one of integers from 1 to 4.

For example, each of Chemical Formulas 201 and 202 may include at least one of the groups represented by Chemical Formulas CY201 to CY217:

In Formulas CY201 to CY217, descriptions of R _10b and R _10c refer to the description of R _10a in the present specification, respectively, and ring CY ₂₀₁ to ring CY ₂₀₄ are each independently a C ₃ -C ₂₀ carbocyclic group , or a C ₁ -C ₂₀ heterocyclic group, and at least one hydrogen of Formulas CY201 to CY217 may be unsubstituted or substituted with R _10a as described herein.

According to one embodiment, ring CY ₂₀₁ to ring CY ₂₀₄ in Chemical Formulas CY201 to CY217 may be each independently a benzene group, a naphthalene group, a phenanthrene group, or an anthracene group.

According to another embodiment, each of Chemical Formulas 201 and 202 may include at least one of the groups represented by Chemical Formulas CY201 to CY203.

According to another embodiment, Chemical Formula 201 may include at least one of the groups represented by Chemical Formulas CY201 to CY203 and at least one of the groups represented by Chemical Formulas CY204 to CY217, respectively.

According to another embodiment, in Chemical Formula 201, xa1 is 1, R ₂₀₁ is a group represented by one of the Chemical Formulas CY201 to CY203, xa2 is 0, and R ₂₀₂ may be a group represented by one of Chemical Formulas CY204 to CY207. .

According to another embodiment, each of Chemical Formulas 201 and 202 may not include groups represented by Chemical Formulas CY201 to CY203.

According to another embodiment, each of Chemical Formulas 201 and 202 may not include the groups represented by Chemical Formulas CY201 to CY203 and may include at least one of the groups represented by Chemical Formulas CY204 to CY217.

As another example, each of Chemical Formulas 201 and 202 may not include groups represented by Chemical Formulas CY201 to CY217.

For example, the hole transport region is one of the following compounds HT1 to HT46, m-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, Spiro-TPD, Spiro-NPB, methylated-NPB , TAPC, HMTPD, TCTA (4,4',4"-tris(N-carbazolyl)triphenylamine (4,4',4"-tris(N-carbazolyl)triphenylamine)), Pani/DBSA (Polyaniline/ Dodecylbenzenesulfonic acid (Polyaniline/Dodecylbenzenesulfonic acid)), PEDOT/PSS (Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfonate) (Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfone) nate))), Pani/CSA (Polyaniline/Camphor sulfonic acid), PANI/PSS (Polyaniline/Poly(4-styrenesulfonate) (polyaniline/poly(4-styrenesulfonate)), or any thereof may include a combination of:

The light emitting auxiliary layer serves to increase light emission efficiency by compensating for an optical resonance distance according to the wavelength of light emitted from the light emitting layer, and the electron blocking layer prevents electron leakage from the light emitting layer to the hole transport region. It is a layer that plays a role in A material that may be included in the aforementioned hole transport region may be included in the emission auxiliary layer and the electron blocking layer.

In addition to the materials described above, the hole transport region may include a charge-generating material to improve conductivity. The charge-generating material may be uniformly or non-uniformly dispersed (eg, in the form of a single layer consisting of the charge-generating material) in the hole transport region.

The charge-generating material may be, for example, a p-dopant.

For example, the LUMO energy level of the p-dopant may be -3.5 eV or less.

According to one embodiment, the p-dopant may include a quinone derivative, a cyano group-containing compound, an element EL1 and an element EL2-containing compound, or any combination thereof.

Examples of the quinone derivative may include TCNQ, F4-TCNQ, and the like.

Examples of the cyano group-containing compound may include HAT-CN, a compound represented by Chemical Formula 221, and the like.

<Formula 221>

In Formula 221,

R ₂₂₁ to R ₂₂₃ are each independently a C ₃ -C ₆₀ carbocyclic group unsubstituted or substituted with at least one R _10a , or a C ₁ -C ₆₀ heterocyclic group optionally substituted with at least one R _10a . is a click group,

At least one of R ₂₂₁ to R ₂₂₃ may be independently selected from a cyano group; -F; -Cl; -Br; -I; a C ₁ -C ₂₀ alkyl group substituted with a cyano group, -F, -Cl, -Br, -I, or any combination thereof; or any combination thereof; may be a C ₃ -C ₆₀ carbocyclic group or a C ₁ -C ₆₀ heterocyclic group.

Among the above element EL1 and element EL2-containing compounds, element EL1 may be a metal, metalloid, or combination thereof, and element EL2 may be a nonmetal, metalloid, or combination thereof.

Examples of the metal include alkali metals (eg, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), etc.); alkaline earth metals (eg, 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 (eg, 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.); etc. may be included.

Examples of the metalloid may include silicon (Si), antimony (Sb), tellurium (Te), and the like.

Examples of the non-metal may include oxygen (O), halogen (eg, F, Cl, Br, I, etc.).

For example, the element EL1 and element EL2-containing compound may be a metal oxide, metal halide (eg, metal fluoride, metal chloride, metal bromide, metal iodide, etc.), metalloid halide (eg, metal fluoride, metal chloride, etc.) , metalloid fluorides, metalloid chlorides, metalloid bromides, metalloid iodides, etc.), metal tellurides, or any combination thereof.

Examples of the metal oxide include tungsten oxide (eg, WO, W ₂ O ₃ , WO ₂ , WO ₃ , W ₂ O ₅ , etc.), vanadium oxide (eg, VO, V ₂ O ₃ , VO ₂ , V ₂ O ₅ , etc.), molybdenum oxide (eg, MoO, Mo ₂ O ₃ , MoO ₂ , MoO ₃ , Mo ₂ O ₅ , etc.), rhenium oxide (eg, ReO ₃ , etc.), and the like.

Examples of the metal halide may include alkali metal halides, alkaline earth metal halides, transition metal halides, post-transition metal halides, lanthanide metal halides, and the like.

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

Examples of the alkaline earth metal halide include BeF ₂ , MgF ₂ , CaF ₂ , SrF ₂ , BaF ₂ , BeCl ₂ , MgCl ₂ , CaCl ₂ , SrCl ₂ , BaCl ₂ , BeBr ₂ , MgBr ₂ , CaBr ₂ , SrBr ₂ , BaBr ₂ , BeI ₂ , MgI ₂ , CaI ₂ , SrI ₂ , BaI _{2 ,} and the like.

Examples of the transition metal halide include titanium halides (eg, TiF ₄ , TiCl ₄ , TiBr ₄ , TiI _{4 ,} etc.), zirconium halides (eg, ZrF ₄ , ZrCl ₄ , ZrBr ₄ , ZrI ₄ ). etc.), hafnium halides (eg, HfF ₄ , HfCl ₄ , HfBr ₄ , HfI ₄ , etc.), vanadium halides (eg VF 3 , VCl _{3 ,} VBr ₃ , VI _{3 ,} etc.), niobium halides (eg NbF ₃ , NbCl ₃ , NbBr ₃ , NbI _{3 ,} etc.), tantalum halides (eg TaF ₃ , TaCl ₃ , TaBr ₃ , TaI _{3 ,} etc.), chromium halides (eg CrF ₃ , CrCl ₃ , CrBr ₃ , CrI ₃ etc.), molybdenum halides (eg MoF ₃ , MoCl ₃ , MoBr ₃ , MoI ₃ etc.), tungsten halides (eg WF ₃ , WCl ₃ , WBr ₃ , WI _{3 ,} etc.), manganese halides (eg, MnF ₂ , MnCl ₂ , MnBr 2 , MnI ₂ , etc.), technetium halides (eg, TcF ₂ , TcCl _{2 ,} TcBr ₂ , TcI ₂ , etc.) , rhenium halides (eg ReF ₂ , ReCl ₂ , ReBr ₂ , ReI _{2 ,} etc.), iron halides (eg FeF ₂ , FeCl ₂ , FeBr ₂ , FeI _{2 ,} etc.), ruthenium halides (eg For example, RuF ₂ , RuCl ₂ , RuBr ₂ , RuI ₂ etc.), osmium halides (eg OsF ₂ , OsCl ₂ , OsBr ₂ , OsI ₂ etc.), cobalt halides (eg CoF ₂ , CoCl ₂ , CoBr ₂ , CoI _{2 ,} etc.), rhodium halides (eg RhF ₂ , RhCl ₂ , RhBr 2 , _{RhI 2} , etc.), iridium halides (eg IrF ₂ , IrCl ₂ , IrBr ₂ , IrI ₂ etc.), nickel halides (eg NiF ₂ , NiCl ₂ , NiBr ₂ , NiI ₂ etc.), palladium halides (eg PdF 2 , PdCl _{2 ,} PdBr ₂ , PdI ₂ etc.), platinum Halides (eg PtF ₂ , PtCl ₂ , PtBr ₂ , PtI _{2 ,} etc.), copper halides (eg CuF, CuCl, CuBr, CuI etc.), silver halides (eg AgF, AgCl , AgBr, AgI, etc.), gold halides (eg, AuF, AuCl, AuBr, AuI, etc.), and the like.

Examples of the post-transition metal halide include zinc halides (eg, ZnF ₂ , ZnCl ₂ , ZnBr ₂ , ZnI _{2 ,} etc.), indium halides (eg, InI ₃ , etc.), tin halides (eg, For example, SnI _{2 ,} etc.), and the like.

Examples of the lanthanide metal halide include YbF, YbF ₂ , YbF ₃ , SmF ₃ , YbCl, YbCl ₂ , YbCl ₃ SmCl ₃ , YbBr, YbBr ₂ , YbBr ₃ SmBr ₃ , YbI, YbI ₂ , YbI ₃ , SmI ₃ may be included.

Examples of the metalloid halide may include antimony halide (eg, SbCl ₅ , etc.).

Examples of the metal telluride include alkali metal tellurides (eg, Li ₂ Te, Na ₂ Te, K ₂ Te, Rb ₂ Te, Cs ₂ Te, etc.), alkaline earth metal tellurides (eg, BeTe, MgTe, CaTe, SrTe, BaTe, etc.), transition metal tellurides (eg TiTe ₂ , ZrTe ₂ , HfTe ₂ , V ₂ Te ₃ , Nb ₂ Te ₃ , Ta ₂ Te ₃ , Cr ₂ Te ₃ , Mo ₂ Te ₃ , W ₂ Te ₃ , MnTe, TcTe, ReTe, FeTe, RuTe, OsTe, CoTe, RhTe, IrTe, NiTe, PdTe, PtTe, Cu ₂ Te, CuTe, Ag ₂ Te, AgTe, Au ₂ Te, etc.), post-transition metal tellurides (e.g. ZnTe, etc.), lanthanide metal tellurides (e.g. LaTe, CeTe, PrTe, NdTe, PmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, etc.) and the like.

[Resonance control layer (141, 142, 143)]

According to an embodiment, the intermediate layer includes the first resonance control layer 141, the second pixel electrode 112, and the second light emitting layer 132 disposed between the first pixel electrode 111 and the first light emitting layer 131. A second resonance control layer 142 disposed therebetween and/or a third resonance control layer 143 disposed between the third pixel electrode 113 and the third light emitting layer 133 may be further included.

The first resonance control layer 141, the second resonance control layer 142, and the third resonance control layer 143 each have i) a single-layer structure made of a single layer made of a single material, ii) made of a plurality of different materials. It may have a single-layer structure made of a single layer or iii) a multi-layer structure having a plurality of layers made of a plurality of different materials.

The first resonance control layer 141, the second resonance control layer 142, and the third resonance control layer 143 may include the aforementioned hole transport material.

The first resonance control layer 141, the second resonance control layer 142, and the third resonance control layer 143 may be provided to appropriately adjust L ₁ , L ₂ and L ₃ , respectively.

[Emitting layer (131, 132, 133)]

The light emitting layers 131, 132, and 133 may include a host and a dopant. The dopant may include at least one of a phosphorescent dopant and a fluorescent dopant.

The content of the dopant in the emission layers 131, 132, and 133 may be typically selected from about 0.01 to about 15 parts by weight based on about 100 parts by weight of the host, but is not limited thereto.

Each of the light emitting layers 131 , 132 , and 133 may have a thickness of about 100 Å to about 1000 Å, for example, about 200 Å to about 600 Å. When the thicknesses of the light emitting layers 131, 132, and 133 satisfy the aforementioned range, excellent light emitting characteristics may be exhibited without a substantial increase in driving voltage.

The host is one of the following compounds H1 to H124, ADN (9,10-Di (2-naphthyl) anthracene), MADN (2-Methyl-9,10-bis (naphthalen-2-yl) anthracene), TBADN (9 ,10-di-(2-naphthyl)-2-t-butyl-anthracene), CBP (4,4′-bis(N-carbazolyl)-1,1′-biphenyl), mCP (1,3-di- 9-carbazolylbenzene), TCP (1,3,5-tri(carbazol-9-yl)benzene), or any combination thereof:

The first light emitting layer 131 includes PtOEP, Ir(piq) ₃ , Btp ₂ Ir(acac), Ir(piq) ₂ (acac), Ir(2-phq) ₂ (acac), Ir(2-phq) ₃ , Ir(flq) ₂ (acac), Ir(fliq) ₂ (acac), DCM, DCJTB, PBD: Eu(DBM) ₃ (Phen) (tris(di benzoylmethanato) phenanthoroline europium), Perylene derivatives, or Any combination thereof may be included as a dopant, but is not limited thereto.

PtOEP Ir(piq) ₃ Btp ₂ Ir (acac)

Ir(piq) ₂ (acac) Ir(2-phq) ₂ (acac) Ir(2-phq) ₃

Ir(flq) ₂ (acac) Ir(fliq) ₂ (acac)

DCM DCJTB

The second light-emitting layer 132 is Ir (ppy) ₃ (tris (2-phenylpyridine) iridium: tris (2-phenylpyridine) iridium), Ir (ppy) ₂ (acac) (Bis (2-phenylpyridine) (acetylacetonato) iridium (III): bis (2-phenylpyridine) (acetylaceto) iridium (III)), Ir (mppy) ₃ (tris (2- (4-tolyl) phenylpiridine) iridium: tris (2- (4-tolyl) phenyl pyridine) iridium), C545T (10-(2-benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-[1]benzopyrano [6,7, 8-ij]-quinolizin-11-one: 10-(2-benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7,-tetrahydro-1H,5H,11H- [1] benzopyrano [6,7,8-ij] -quinolizin-11-one), or any combination thereof as a dopant, but is not limited thereto.

Ir(ppy) ₃ Ir(mppy) ₃ Ir(ppy) ₂ (acac)

C545T

The third light emitting layer 133 includes 4,6-F ₂ Irpic, (F ₂ ppy) ₂ Ir(tmd), Ir(dfppz) ₃ , ter-fluorene, DPAVBi(4,4'-bis (4-diphenylaminostyryl)biphenyl: 4,4'-bis(4-diphenylaminostaryl)biphenyl), spiro-DPVBi (spiro-DPVBi), TBPe(2,5,8,11-tetra-t-butylperylene : 2,5,8,11-tetra-t-butylperylene), DSB (distyryl-benzene), DSA (distyryl-arylene), PFO (Polyfluorene) polymer and PPV (poly (p-phenylene vinylene) polymer , or any combination thereof as a dopant, but is not limited thereto.

F ₂ Irpic (F ₂ ppy) ₂ Ir(tmd) Ir(dfppz) ₃

DPAVBi

DPVBi TBPe

[electron transport region 140]

The light emitting device of the present application includes light emitting layers 131 , 132 , and 133 and an electron transport region 140 disposed between the light emitting layers 131 , 132 , 133 and the counter electrode 150 .

According to an embodiment, the hole transport region may be a common layer disposed to correspond to all of the first light emitting region, the second light emitting region, and the third light emitting region.

The electron transport region 140 includes an electron transport layer, and the electron transport layer includes a mixture of a first material, a second material, and a third material described later.

The electron transport layer of the light emitting device of the present application includes a mixture of a first material that is an electron transport compound, a second material that is a metal-containing compound, and a third material that is a low refractive index compound.

Material 1 of the electron transport layer serves to transport the injected electrons. The second material serves to facilitate injection of electrons from the metal electrode. The third material serves to lower the refractive index of the entire electron transport layer without affecting the roles of the above two materials.

Since the electron transport layer includes a third material, the overall refractive index of the electron transport layer is lowered compared to conventional light emitting devices, thereby reducing light loss due to surface plasmon polaritons (SPP), thereby reducing the total amount of light emitted into the air. has an increasing effect.

The electron transport layer has a form in which the first material, the second material, and the third material are mixed in the same ratio with respect to the entire thickness of the electron transport layer. Since the injection flow of electrons may be hindered when the first material, the second material, and the third material are present in the electron transport layer as a single film, the present application is limited to the case where the three materials are mixed in the same ratio. .

Accordingly, a light emitting device including an electron transport layer including a mixture of the first material, the second material, and the third material, such as an organic light emitting device, may have a low driving voltage and high efficiency.

The first material, the second material, and the third material may be different from each other.

According to one embodiment, the electron transport layer may have a single-layer structure consisting of a mixture of the first material, the second material, and the third material.

According to one embodiment, the electron transport layer may be formed by co-deposition of the first material, the second material, and the third material.

According to one embodiment, the electron transport layer may be formed by thermal evaporation of the first material, the second material, and the third material.

According to one embodiment, the electron transport layer and the light emitting layer may contact each other (directly contract).

According to one embodiment, the electron transport layer and the counter electrode may contact each other (directly contract).

According to one embodiment, the electron transport region may have a single-layer structure consisting of an electron transport layer including the first material, the second material, and the third material.

According to one embodiment, the refractive index of the electron transport layer may be 1.65 (at 550 nm) or less.

The first material includes an electron transporting compound.

According to one embodiment, the electron transporting compound may include _at least one π electron-deficient nitrogen-containing C _{1 -C 60} cyclic group. .

According to one embodiment, the electron transporting compound is at least one pyrazole group, imidazole group, triazole group, oxazole group, isoxazole group, oxadiazole group, thiazole group, isothiazole group, thiadia sol group, benzopyrazole group, benzimidazole group, benzoxazole group, benzoisoxazole group, benzothiazole group, benzoisothiazole group, pyridine group, pyrimidine group, pyrazine group, pyridazine group, triazine group, quinoline group, isoquinoline group, benzoquinoline group, benzoisoquinoline group, quinoxaline group, benzoquinoxaline group, quinazoline group, benzoquinazoline group, phenanthroline group, cinoline group, phthalazine group, Naphthyridine group, imidazopyridine group, imidazopyrimidine group, imidazotriazine group, imidazopyrazine group, imidazopyridazine group, azacarbazole group, azafluorene group, azadibenzosilol group, aza It may contain a dibenzothiophene group or an azadibenzofuran group.

According to one embodiment, the electron transporting compound may be represented by Formula 101:

<Formula 101>

[Ar ₁₀₁ ] _xe11 -[(L ₁₀₁ ) _xe1 -R ₁₀₁ ] _xe21

In Formula 101,

Ar ₁₀₁ and L ₁₀₁ are each independently a C ₃ -C ₆₀ carbocyclic group optionally substituted with at least one R _10a , or a C ₁ -C ₆₀ heterocyclic group optionally substituted with at least one R _10a . is a cyclic group,

xe11 is 1, 2 or 3;

xe1 is 0, 1, 2, 3, 4, or 5;

R ₁₀₁ is a C ₃ -C ₆₀ carbocyclic group optionally substituted with at least one R _10a , a C ₁ -C ₆₀ heterocyclic group optionally substituted with at least _one R 10a, -Si(Q ₁₀₁ )(Q ₁₀₂ )(Q ₁₀₃ ), -C(=0)(Q ₁₀₁ ), -S(=0) ₂ (Q ₁₀₁ ), or -P(=0)(Q ₁₀₁ )(Q ₁₀₂ ); ,

The description of Q ₁₀₁ to Q ₁₀₃ refers to the description of Q ₁ in the present specification, respectively,

xe21 is 1, 2, 3, 4, or 5;

At least one of Ar ₁₀₁ , L ₁₀₁ and R ₁₀₁ may be a π electron-deficient nitrogen-containing C ₁ -C ₆₀ cyclic group unsubstituted or substituted with at least one R _10a independently of each other.

For example, when xe11 in Formula 101 is two or more, two or more Ar _101s may be connected to each other through a single bond.

As another example, Ar ₁₀₁ in Formula 101 may be a substituted or unsubstituted anthracene group.

According to another embodiment, the electron transporting compound may be represented by Formula 102:

<Formula 102>

In Formula 102,

X ₁ may be N or C(R ₁ );

X ₂ may be N or C(R ₂ );

X ₃ may be N or C(R ₃ );

At least one of X ₁ to X ₃ may be N,

L ₁₁ to L ₁₃ are each independently a single bond, a C ₅ -C ₆₀ carbocyclic group optionally substituted with at least one R _10a , or a C ₁ -C ₆₀ optionally substituted with at least one R _10a . It can be a heterocyclic group,

a11 to a13 may be each independently an integer of 1 to 5;

R ₁ to R ₃ and R ₁₁ to R ₁₃ are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, and at least one R _10a substituted or An unsubstituted C ₁ -C ₆₀ alkyl group, a C ₂ -C ₆₀ alkenyl group unsubstituted or substituted with at least one R _10a , a C ₂ -C ₆₀ alkynyl group optionally substituted with at least one R _10a , or at least one of C ₁ -C ₆₀ alkoxy group optionally substituted with R _10a , C ₃ -C ₆₀ carbocyclic group optionally substituted with at least one R _10a , C optionally substituted with at least one R _{10a 1} -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryloxy group optionally substituted with at least one R _10a , C ₆ -C ₆₀ arylthio group optionally substituted with at least one R _10a , - Si(Q ₁ )(Q ₂ )(Q ₃ ), -N(Q ₁ )(Q ₂ ), -B(Q ₁ )(Q ₂ ), -C(=0)(Q ₁ ), -S( =O) ₂ (Q ₁ ) or -P(=O)(Q ₁ )(Q ₂ );

b ₁₁ to b ₁₃ may be each independently an integer of 1 to 10;

The R _10a is,

heavy hydrogen (-D), -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, or a nitro group;

Heavy hydrogen, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, C ₃ -C ₆₀ carbocyclic group, C ₁ -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryl Oxy group, C ₆ -C ₆₀ Arylthio group, -Si(Q ₁₁ )(Q ₁₂ )(Q ₁₃ ), -N(Q ₁₁ )(Q ₁₂ ), -B(Q ₁₁ )(Q ₁₂ ), - Unsubstituted or substituted with C(=0)(Q ₁₁ ), -S(=0) ₂ (Q ₁₁ ), -P(=0)(Q ₁₁ )(Q ₁₂ ), or any combination thereof, C ₁ -C ₆₀ alkyl group, C ₂ -C ₆₀ alkenyl group, C ₂ -C ₆₀ alkynyl group, or C ₁ -C ₆₀ alkoxy group;

Heavy hydrogen, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, C ₁ -C ₆₀ alkyl group, C ₂ -C ₆₀ alkenyl group, C ₂ -C ₆₀ alkynyl group, C ₁ - C ₆₀ alkoxy group, C ₃ -C ₆₀ carbocyclic group, C ₁ -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryloxy group, C ₆ -C ₆₀ arylthio group, -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(=0)(Q ₂₁ )(Q ₂₂ ), or a C ₃ -C ₆₀ carbocyclic group, a C ₁ -C ₆₀ heterocyclic group, unsubstituted or substituted with any combination thereof; a C ₆ -C ₆₀ aryloxy group or a C ₆ -C ₆₀ arylthio group; or

-Si(Q ₃₁ )(Q ₃₂ )(Q ₃₃ ), -N(Q ₃₁ )(Q ₃₂ ), -B(Q ₃₁ )(Q ₃₂ ), -C(=O)(Q ₃₁ ), -S (=0) ₂ (Q ₃₁ ), or -P(=0)(Q ₃₁ )(Q ₃₂ );

The above Q ₁ , Q ₂ , Q ₁₁ to Q ₁₃ , Q ₂₁ to Q ₂₃ and Q ₃₁ to Q ₃₃ are each independently hydrogen; heavy hydrogen; -F; -Cl; -Br; -I; hydroxyl group; cyano group; nitro group; C ₁ -C ₆₀ alkyl group; C ₂ -C ₆₀ alkenyl group; C ₂ -C ₆₀ alkynyl group; C ₁ -C ₆₀ alkoxy group; or a C ₃ -C ₆₀ carbocyclic group unsubstituted or substituted with heavy hydrogen, -F, a cyano group, a C ₁ -C ₆₀ alkyl group, a C ₁ -C ₆₀ alkoxy group, a phenyl group, a biphenyl group, or any combination thereof. or a C ₁ -C ₆₀ heterocyclic group.

According to one embodiment, the electron transporting compound is one of the following compounds ET1 to ET45, BCP (2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline), Bphen (4,7-Diphenyl-1, 10-phenanthroline), Alq ₃ , BAlq, TAZ or NTAZ, but is not limited thereto:

According to one embodiment, the electron transporting compound may be a fluoro-free compound.

The above "fluoro-free compound" means a compound in which a fluoro group is not included as a substituent in the compound, and therefore, a fluoro group-free compound does not contain a fluoro group.

According to one embodiment, the electron transporting compound may be a metal-free compound.

The above "metal-free compound" means a compound that does not contain a metal atom in the compound.

The second material includes a metal-containing compound.

According to one embodiment, the metal-containing compound is an alkali metal, alkaline earth metal, rare earth metal, alkali metal-containing compound, alkaline earth metal-containing compound, rare earth metal-containing compound, alkali metal complex, alkaline earth metal complex, rare earth metal complex , or any combination thereof.

According to another embodiment, the metal-containing compound may include an alkali metal complex, an alkaline earth metal complex, or any combination thereof.

According to one embodiment, the metal ion of the alkali metal complex may be a Li ion, Na ion, K ion, Rb ion or Cs ion, and the metal ion of the alkaline earth metal complex may be a Be ion, Mg ion, Ca ion, It may be Sr ions or Ba ions. The ligands coordinated to the metal ions of the alkali metal complex and the alkaline earth metal complex are, independently of each other, hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyl oxazole, hydroxyphenylthiazole, hydroxyphenyloxadiazole, hydroxyphenylthiadiazole, hydroxyphenylpyridine, hydroxyphenylbenzoimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthroline, cyclo pentadiene, or any combination thereof.

According to one embodiment, the metal-containing material may include a Li complex.

The Li complex may include, for example, the following compounds ET-D1 (LiQ) or ET-D2:

The third material includes a low refractive index compound.

According to one embodiment, the refractive index of the low refractive index compound may be 1.45 (at 550 nm) or less.

According to one embodiment, the low refractive index compound may include at least one fluoro group (-F).

According to one embodiment of the present invention, the low refractive index compound may include a fluoro group. As the low refractive index compound includes a fluoro group, the electron density in the organic molecule may be lowered and the refractive index may be lowered.

According to one embodiment, the low refractive index compound may be a perfluoro compound.

According to one embodiment, the low refractive index compound may be a metal-free compound, and the description of “metal-free compound” follows the above description.

According to one embodiment, the low refractive index compound may be a polymer compound.

According to one embodiment of the present invention, the low refractive index compound may be a polymer compound. As the low refractive index compound corresponds to the polymer compound, the density of organic molecules in the thin film may be lowered, thereby reducing the refractive index.

According to one embodiment, the low refractive index compound may be a polymer compound capable of thermal evaporation.

According to one embodiment, the polymer compound may be an oligomer-polymer having a molecular weight of 5000 or less.

According to one embodiment, the low refractive index compound may be a compound represented by Formula 1 below:

<Formula 1>

In Formula 1,

T ₁ can be C(Z ₁₁ )(Z ₁₂ ), Si(Z ₁₁ )(Z ₁₂ ), O or S;

d1 may be one of integers from 0 to 3;

Y ₁ can be C(Z ₂₁ ), Si(Z ₂₁ ), O or S;

Y ₂ can be C(Z ₂₂ ), Si(Z ₂₂ ), O or S;

Y ₃ can be C(Z ₂₃ )(Z ₂₄ ), Si(Z ₂₃ )(Z ₂₄ ), O or S;

Y ₄ can be C(Z ₂₅ )(Z ₂₆ ), Si(Z ₂₅ )(Z ₂₆ ), O or S;

Y ₅ can be C(Z ₂₇ )(Z ₂₈ ), Si(Z ₂₇ )(Z ₂₈ ), O or S;

d2 may be one of the integers from 0 to 3;

T ₃ may be C(Z ₃₁ )(Z ₃₂ ), Si(Z ₃₁ )(Z ₃₂ ), O or S;

d3 may be one of integers from 0 to 3;

The sum of d1, d2 and d3 may be an integer greater than or equal to 1;

Z ₁₁ , Z ₁₂ , Z ₂₁ to Z ₂₈ , Z ₃₁ and Z ₃₂ are each independently hydrogen, deuterium or -F; or

It may be a C ₁ -C ₆₀ alkyl group, a C ₂ -C ₆₀ alkenyl group, a C ₂ -C ₆₀ alkynyl group, or a C ₁ -C ₆₀ alkoxy group, substituted with at least one -F,

n1 may be one of integers from 10 to 500.

According to one embodiment, Y ₁ in Formula 1 may be C(Z ₂₁ ) and Y ₂ may be C(Z ₂₂ ).

According to one embodiment, in Formula 1, Z ₁₁ , Z ₁₂ , Z ₂₁ to Z ₂₈ , Z ₃₁ and Z ₃₂ are each independently -F; or

It may be a C ₁ -C ₆₀ alkyl group, a C ₂ -C ₆₀ alkenyl group, a C ₂ -C ₆₀ alkynyl group, or a C ₁ -C ₆₀ alkoxy group, substituted with at least one -F.

According to one embodiment, the low refractive index compound may be one of the following compounds 1 to 3, but is not limited thereto:

In the compounds 1 to 3, n11 to n13 are each independently an integer of 10 to 500.

According to one embodiment, the weight part of the third material may be about 30 parts by weight or more and about 50 parts by weight or less based on 100 parts by weight of the total mixture.

According to one embodiment, the weight part of the first material may be about 20 parts by weight or more and about 30 parts by weight or less with respect to a total of 100 parts by weight of the mixture.

According to one embodiment, the weight part of the second material may be about 20 parts by weight or more and about 30 parts by weight or less with respect to a total of 100 parts by weight of the mixture.

According to one embodiment, the weight part of the first material may be about 40 parts by weight or more and about 60 parts by weight or less with respect to a total of 100 parts by weight of the first material and the second material.

According to one embodiment, the weight part of the second material may be about 40 parts by weight or more and about 60 parts by weight or less based on a total of 100 parts by weight of the first material and the second material.

According to one embodiment, the weight ratio of the first material and the second material may be 1:2 to 2:1.

According to one embodiment, the first material may be uniformly dispersed in the electron transport layer.

According to one embodiment, the second material may be uniformly dispersed in the electron transport layer.

According to one embodiment, the third material may be uniformly dispersed in the electron transport layer.

According to one embodiment, a mixture of the first material, the second material, and the third material may be uniformly present in the electron transport layer.

[Capping layer]

A first capping layer is disposed outside the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113, and/or a second capping layer is disposed outside the counter electrode 150. can be placed.

The light generated in the light emitting layers 131 , 132 , and 133 of the intermediate layers of the light emitting device 1 is transmitted through the first pixel electrode 111 , the second pixel electrode 112 , the third pixel electrode 113 , and the first Light generated in the light emitting layer among the intermediate layers 130 of the light emitting element 10 is extracted to the outside through the counter electrode 150, which is a semi-transmissive electrode or a transmissive electrode, and the second capping layer. It can be.

The first capping layer and the second capping layer may serve to improve external luminous efficiency by the principle of constructive interference. As a result, the light extraction efficiency of the light emitting device 1 is increased, so that the luminous efficiency of the light emitting device 1 can be improved.

Each of the first capping layer and the second capping layer may include a material having a refractive index of 1.6 or more (at 589 nm).

The first capping layer and the second capping layer may be independently of each other an organic capping layer containing an organic material, an inorganic capping layer containing an inorganic material, or an organic-inorganic composite capping layer containing an organic material and an inorganic material.

At least one of the first capping layer and the second capping layer may be, independently of each other, a carbocyclic compound, a heterocyclic compound, an amine group-containing compound, a porphine derivative, a phthalocyanine derivative, naphthalocyanine derivatives, alkali metal complexes, alkaline earth metal complexes, or any combination thereof. The carbocyclic compounds, heterocyclic compounds and amine group-containing compounds are optionally substituted with a substituent comprising O, N, S, Se, Si, F, Cl, Br, I, or any combination thereof. can According to one embodiment, at least one of the first capping layer and the second capping layer may independently include an amine group-containing compound.

For example, at least one of the first capping layer and the second capping layer may independently include the compound represented by Chemical Formula 201, the compound represented by Chemical Formula 202, or any combination thereof.

According to another embodiment, at least one of the first capping layer and the second capping layer is, independently of each other, one of the compounds HT28 to HT33, one of the following compounds CP1 to CP6, TPD, β-NPB, or any of them may include compounds of:

[Electronic device]

Light emitting devices as described above may be included in various electronic devices.

Therefore, according to another aspect, a thin film transistor including a source electrode, a drain electrode and an active layer; And including the light emitting element, electrically connected to the source electrode or the drain electrode of the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 of the light emitting element 1, An electronic device is provided.

The electronic device (eg, light emitting device) may further include i) a color filter, ii) a color conversion layer, or iii) a color filter and a color conversion layer, in addition to the light emitting element. The color filter and/or the color conversion layer may be disposed on at least one traveling direction of light emitted from the light emitting device. For example, light emitted from the light emitting device may be blue light or white light. For a description of the light emitting device, refer to the above description. According to one embodiment, the color conversion layer may include quantum dots. The quantum dots may be, for example, quantum dots as described herein.

The electronic device may include a first substrate. The first substrate includes a plurality of sub-pixel areas, the color filter includes a plurality of color filter areas corresponding to each of the plurality of sub-pixel areas, and the color conversion layer is formed in each of the plurality of sub-pixel areas. A plurality of corresponding color conversion areas may be included.

A pixel defining layer is disposed between the plurality of sub-pixel areas to define each sub-pixel area.

The color filter may further include a plurality of color filter areas and a light blocking pattern disposed between the plurality of color filter areas, and the color conversion layer may include a plurality of color conversion areas and a light blocking pattern disposed between the plurality of color conversion areas. may further include.

The plurality of color filter regions (or the plurality of color conversion regions) may include a first region emitting a first color light; a second region emitting second color light; and/or a third region emitting third color light, and the first color light, the second color light, and/or the third color light may have different maximum emission wavelengths. For example, the first color light may be red light, the second color light may be green light, and the third color light may be blue light. For example, the plurality of color filter regions (or the plurality of color conversion regions) may include quantum dots. Specifically, the first region may include red quantum dots, the second region may include green quantum dots, and the third region may not include quantum dots. For a description of quantum dots, refer to what has been described herein. Each of the first region, the second region, and/or the third region may further include a scattering body.

For example, the light emitting element emits a first light, the first region absorbs the first light and emits 1-1 color light, the second region absorbs the first light, The 2-1st color light may be emitted, and the third region may absorb the 1st light to emit the 3-1st color light. In this case, the 1-1st color light, the 2-1st color light, and the 3-1st color light may have different maximum emission wavelengths. Specifically, the first light may be blue light, the 1-1 color light may be red light, the 2-1 color light may be green light, and the 3-1 color light may be blue light.

The electronic device may further include a thin film transistor in addition to the light emitting element described above. The thin film transistor may include a source electrode, a drain electrode, and an active layer, and any one of the source electrode and the drain electrode and the first pixel electrode 111, the second pixel electrode 112, and the third pixel of the light emitting element Any one of the electrode 113 and the counter electrode may be electrically connected.

The thin film transistor may further include a gate electrode and a gate insulating layer.

The active layer may include crystalline silicon, amorphous silicon, an organic semiconductor, an oxide semiconductor, or the like.

The electronic device may further include a sealing unit for sealing the light emitting element. The encapsulation unit may be disposed between the color filter and/or color conversion layer and the light emitting element. The sealing portion allows light from the light emitting element to be taken out to the outside, and at the same time blocks external air and moisture from permeating into the light emitting element. The sealing unit may be a sealing substrate including a transparent glass substrate or a plastic substrate. The encapsulation unit may be a thin film encapsulation layer including at least one organic layer and/or an inorganic layer. When the sealing part is a thin film encapsulation layer, the electronic device may be flexible.

On the sealing part, in addition to the color filter and/or the color conversion layer, various functional layers may be additionally disposed according to the purpose of the electronic device. Examples of the functional layer may include a touch screen layer, a polarization layer, and the like. The touch screen layer may be a resistive touch screen layer, a capacitive touch screen layer, or an infrared touch screen layer. The authentication device may be, for example, a biometric authentication device that authenticates an individual using biometric information of a body (eg, fingertip, pupil, etc.).

The authentication device may further include a biometric information collection unit in addition to the light emitting device as described above.

The electronic devices include various displays, light sources, lighting, personal computers (eg, mobile personal computers), mobile phones, digital cameras, electronic notebooks, electronic dictionaries, electronic game machines, medical devices (eg, electronic thermometers, blood pressure monitors) , blood glucose meter, pulse measuring device, pulse wave measuring device, electrocardiogram display device, ultrasonic diagnostic device, endoscope display device), fish finder, various measuring devices, instrumentation (eg, instrumentation of vehicles, aircraft, ships), projectors, etc. can be applied

[Description of Figures 2 and 3]

2 is a cross-sectional view of a light emitting device according to an embodiment of the present invention.

The light emitting device of FIG. 2 includes a substrate 100, a thin film transistor (TFT), a light emitting element, and an encapsulation part 300 sealing the light emitting element.

The substrate 100 may be a flexible substrate, a glass substrate, or a metal substrate. A buffer layer 210 may be disposed on the substrate 100 . The buffer layer 210 may serve to prevent penetration of impurities through the substrate 100 and provide a flat surface on the upper portion of the substrate 100 .

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

The active layer 220 may include an inorganic semiconductor such as silicon or polysilicon, an organic semiconductor, or an oxide semiconductor, and includes a source region, a drain region, and a channel region.

A gate insulating layer 230 may be disposed on the active layer 220 to insulate the active layer 220 and the gate electrode 240, and the gate electrode 240 may be disposed on the upper portion of the gate insulating layer 230. .

An interlayer insulating layer 250 may be disposed on 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 to insulate them.

A source electrode 260 and a drain electrode 270 may be disposed on the interlayer insulating layer 250 . The interlayer insulating film 250 and the gate insulating film 230 may be formed to expose the source and drain regions of the active layer 220, and the source electrode 260 to contact the exposed source and drain regions of the active layer 220. ) and the drain electrode 270 may be disposed.

The thin film transistor TFT may be electrically connected to the light emitting element to drive the light emitting element, and is covered and protected by the passivation layer 280 . The passivation layer 280 may include an inorganic insulating layer, an organic insulating layer, or a combination thereof. A light emitting device is provided on the passivation layer 280 . The light emitting device includes a pixel electrode 110 , an intermediate layer 130 and a counter electrode 150 .

The pixel electrode 110 corresponds to the first pixel electrode 111, the second pixel electrode 112, and the third pixel electrode 113 of FIG. 1, and refer to the description of the pixel electrodes 111, 112, and 113 of FIG. 1 described above. do.

The pixel electrode 110 may be disposed on the passivation layer 280 . The passivation layer 280 may be disposed to expose a predetermined area without covering the entire drain electrode 270, and the pixel electrode 110 may be disposed to be connected to the exposed drain electrode 270.

A pixel defining layer 290 including an insulating material may be disposed on the pixel electrode 110 . The pixel defining layer 290 exposes a predetermined area of the pixel electrode 110, and an intermediate layer 130 may be formed in the exposed area. The pixel defining layer 290 may be a polyimide or polyacrylic organic layer. Although not shown in FIG. 2 , at least a portion of the intermediate layer 130 may extend to the top of the pixel defining layer 290 and be disposed in the form of a common layer.

A counter electrode 150 may be disposed on the intermediate layer 130 , and a capping layer 170 may be additionally formed on the counter electrode 150 . The capping layer 170 may be formed to cover the counter electrode 150 .

An encapsulation part 300 may be disposed on the capping layer 170 . The encapsulation unit 300 may be disposed on the light emitting device to protect the light emitting device from moisture or oxygen. The encapsulation unit 300 may be formed of an inorganic film including silicon nitride (SiNx), silicon oxide (SiOx), indium tin oxide, indium zinc oxide, or any combination thereof, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, Polyethylenesulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resin (eg, polymethyl methacrylate, polyacrylic acid, etc.), epoxy resin (eg, AGE (aliphatic glycidyl ether), etc. ) or an organic layer including any combination thereof, or a combination of an inorganic layer and an organic layer.

3 is a cross-sectional view of a light emitting device according to another embodiment of the present invention.

The light emitting device of FIG. 3 is the same as the light emitting device of FIG. 2 except that the light blocking pattern 500 and the functional region 400 are additionally disposed on the encapsulation portion 300 . The functional area 400 may be i) a color filter area, ii) a color conversion area, or iii) a combination of a color filter area and a color conversion area. According to one embodiment, the light emitting device included in the light emitting device of FIG. 3 may be a tandem light emitting device.

[Description of Figure 4]

4 is a graph measuring refractive indices according to wavelengths for ETLs A to E according to Evaluation Example 1;

[Description of FIGS. 5A to 5C]

5A to 5C are graphs showing simulation values of luminous efficiency of light emitting devices including ETL D and E in red, green, and blue wavelength regions, respectively, according to Evaluation Example 2; 5A to 5C, it can be seen that ETL E exhibits higher maximum luminous efficiency than ETL D in all wavelength regions.

[Manufacturing method]

Each layer included in the hole transport region, the light emitting layer, and each layer included in the electron transport region are each vacuum deposition method, spin coating method, cast method, LB method (Langmuir-Blodgett), inkjet printing method, laser printing method, laser It may be formed in a predetermined area using various methods such as laser induced thermal imaging (LITI).

When each layer included in the hole transport region, the light emitting layer, and each layer included in the electron transport region are formed by a vacuum deposition method, the deposition conditions are, for example, a deposition temperature of about 100 to about 500 ° C., about 10 Within the range of ^-8 to about 10 ^-3 torr of vacuum and about 0.01 to about 100 Å/sec of deposition rate, it may be selected in consideration of the material to be included in the layer to be formed and the structure of the layer to be formed.

[Definition of Terms]

In the present specification, a C ₃ -C ₆₀ carbocyclic group refers to a cyclic group having 3 to 60 carbon atoms consisting only of carbon as a ring-forming atom, and a C ₁ -C ₆₀ heterocyclic group is a ring-forming group other than carbon. It means a cyclic group having 1 to 60 carbon atoms further including a hetero atom as an atom. Each of the C ₃ -C ₆₀ carbocyclic group and C ₁ -C ₆₀ heterocyclic group may be a monocyclic group consisting of one ring or a polycyclic group in which two or more rings are condensed with each other. For example, the number of ring-forming atoms in the C ₁ -C ₆₀ heterocyclic group may be 3 to 61.

In the present specification, the cyclic group includes both the C ₃ -C ₆₀ carbocyclic group and the C ₁ -C ₆₀ heterocyclic group.

In the present specification, the π electron-rich C ₃ -C ₆₀ cyclic group is a ring-forming moiety _, and is a cyclic group having 3 to 60 _carbon atoms without *-N=*'. group, and the π electron-deficient nitrogen-containing C ₁ -C ₆₀ cyclic group is _a ring-forming moiety _, including *-N=*' It means a heterocyclic group having 1 to 60 carbon atoms.

for example,

The C ₃ -C ₆₀ carbocyclic group is i) a group T1 or ii) a condensed ring group in which two or more groups T1 are condensed with each other (eg, a cyclopentadiene group, an adamantane group, a norbornane group, Benzene group, pentalene group, naphthalene group, azulene group, indacene group, acenaphthylene group, phenalene group, phenanthrene group, anthracene group, fluoranthene group, triphenylene group, pyrene group, chrysene group, perylene group, pentapene group, heptalene group, naphthacene group, picene group, hexacene group, pentacene group, rubicene group, coronene group, ovalene group, indene group, fluorene group, spiro -a non-fluorene group, a benzofluorene group, an indenophenanthrene group, or an indenoanthracene group);

The C ₁ -C ₆₀ heterocyclic group is i) a group T2, ii) a condensed cyclic group in which two or more groups T2 are condensed with each other, or iii) a condensed cyclic group in which one or more groups T2 and one or more groups T1 are condensed with each other (eg For example, pyrrole group, thiophene group, furan group, indole group, benzoindole group, naphtoindole group, isoindole group, benzoisoindole group, naphthoisoindole group, benzosilol group, benzothiophene group, benzo Furan group, carbazole group, dibenzosilol group, dibenzothiophene group, dibenzofuran group, indenocarbazole group, indolocarbazole group, benzofurocarbazole group, benzothienocarbazole group, benzo Silolocarbazole group, benzoindolocarbazole group, benzocarbazole group, benzonaphthofuran group, benzonaphthothiophene group, benzonaphthosylol group, benzofurodibenzofuran group, benzofurodibenzothiophene group , benzothienodibenzothiophene group, pyrazole group, imidazole group, triazole group, oxazole group, isoxazole group, oxadiazole group, thiazole group, isothiazole group, thiadiazole group, benzopyra sol group, benzimidazole group, benzooxazole group, benzoisoxazole group, benzothiazole group, benzoisothiazole group, pyridine group, pyrimidine group, pyrazine group, pyridazine group, triazine group, quinoline group, Isoquinoline group, benzoquinoline group, benzoisoquinoline group, quinoxaline group, benzoquinoxaline group, quinazoline group, benzoquinazoline group, phenanthroline group, cinoline group, phthalazine group, naphthyridine group, imimi Dazopyridine group, imidazopyrimidine group, imidazotriazine group, imidazopyrazine group, imidazopyridazine group, azacarbazole group, azafluorene group, azadibenzosilol group, azadibenzothiophene group , azadibenzofuran group, etc.),

The π electron-excess C ₃ -C ₆₀ cyclic group is 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 in which two or more groups T3 are condensed with each other group or v) a condensed ring group in which one or more groups T3 and one or more groups T1 are condensed with each other (eg, the C ₃ -C ₆₀ carbocyclic group, 1H-pyrrole group, silole group, borole group, 2H-pyrrole group, 3H-pyrrole group, thiophene group, furan group, indole group, benzoindole group, naphtoindole group, isoindole group, benzoisoindole group, naphthoisoindole group, benzosilol group, benzothione Opene group, benzofuran group, carbazole group, dibenzosilol group, dibenzothiophene group, dibenzofuran group, indenocarbazole group, indolocarbazole group, benzofurocarbazole group, benzothienocarba sol group, benzosylolocarbazole group, benzoindolocarbazole group, benzocarbazole group, benzonaphthofuran group, benzonaphthothiophene group, benzonaphthosylol group, benzofurodibenzofuran group, benzofurodi benzothiophene group, benzothienodibenzothiophene group, etc.)

The π electron-deficient nitrogen-containing C ₁ -C ₆₀ cyclic group is i) a group T4, ii) a condensed ring group in which two or more groups T4 are condensed with each other, iii) 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 (eg For example, pyrazole group, imidazole group, triazole group, oxazole group, isoxazole group, oxadiazole group, thiazole group, isothiazole group, thiadiazole group, benzopyrazole group, benzimidazole group , benzooxazole group, benzoisoxazole group, benzothiazole group, benzoisothiazole group, pyridine group, pyrimidine group, pyrazine group, pyridazine group, triazine group, quinoline group, isoquinoline group, benzoquinoline group , benzoisoquinoline group, quinoxaline group, benzoquinoxaline group, quinazoline group, benzoquinazoline group, phenanthroline group, sinoline group, phthalazine group, naphthyridine group, imidazopyridine group, imidazophy Rimidine group, imidazotriazine group, imidazopyrazine group, imidazopyridazine group, azacarbazole group, azafluorene group, azadibenzosilol group, azadibenzothiophene group, azadibenzofuran group, etc. ) can be,

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, and a cyclohexadiene group , cycloheptene group, adamantane group, norbornane (or, bicyclo [2.2.1] heptane) group, norbornene group, A bicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane group, a bicyclo[2.2.2]octane group, or a benzene group. is a group,

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, and a tetrazole group. group, oxazole group, isoxazole group, oxadiazole group, thiazole group, isothiazole group, thiadiazole group, azasilol group, azaborol group, pyridine group, pyrimidine group, pyrazine group, Pyridazine group, triazine group, tetrazine group, pyrrolidine group, imidazolidine group, dihydropyrrole group, piperidine group, tetrahydropyridine group, dihydropyridine group, hexahydropyrimidine group, tetra A hydropyrimidine group, a dihydropyrimidine group, a piperazine group, a tetrahydropyrazine group, a dihydropyrazine group, a tetrahydropyridazine group, or a dihydropyridazine group;

The group T3 is a furan group, a thiophene group, a 1H-pyrrole group, a silole group, or a borole group,

The group T4 is 2H-pyrrole group, 3H-pyrrole group, imidazole group, pyrazole group, triazole group, tetrazole group, oxazole group, isoxazole group, oxadiazole group, thiazole group , Isothiazole group, thiadiazole group, azasilol group, azaborol group, pyridine group, pyrimidine group, pyrazine group, pyridazine group, triazine group or tetrazine group.

In the present specification, a cyclic group, a C ₃ -C ₆₀ carbocyclic group, a C ₁ -C ₆₀ heterocyclic group, a π electron-excess C ₃ -C ₆₀ cyclic group, or a π electron-deficient nitrogen-containing C ₁ - The term C ₆₀ cyclic group refers to a group condensed to any cyclic group, a monovalent group or a multivalent group (eg, a divalent group, a trivalent group, 4 groups, etc.). For example, the “benzene group” may be a benzo group, a phenyl group, a phenylene group, and the like, which can be easily understood by those skilled in the art according to the structure of the chemical formula in which the “benzene group” is included.

For example, examples of a monovalent C ₃ -C ₆₀ carbocyclic group and a monovalent C ₁ -C ₆₀ heterocyclic group include a C ₃ -C ₁₀ cycloalkyl group, a C ₁ -C ₁₀ heterocycloalkyl group, a C ₃ -C ₁₀ cycloalkenyl group, C ₁ -C ₁₀ heterocycloalkenyl group, C ₆ -C ₆₀ aryl group, C ₁ -C ₆₀ heteroaryl group, monovalent non-aromatic condensed polycyclic group, and monovalent non-aromatic hetero group It may contain a condensed polycyclic group, and examples of a divalent C ₃ -C ₆₀ carbocyclic group and a monovalent C ₁ -C ₆₀ heterocyclic group include a C ₃ -C ₁₀ cycloalkylene group, a C ₁ -C ₁₀ Heterocycloalkylene group, C ₃ -C ₁₀ cycloalkenylene group, C ₁ -C ₁₀ heterocycloalkenylene group, C ₆ -C ₆₀ arylene group, C ₁ -C ₆₀ heteroarylene group, divalent non-aromatic condensed polycyclic ring group, and a substituted or unsubstituted divalent non-aromatic heterocondensed polycyclic group.

In the present specification, C ₁ -C ₆₀ alkyl group refers to a linear 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, n -butyl group, sec -butyl group, isobutyl group, tert -butyl group, n -pentyl group, tert -pentyl group, neopentyl group, isopentyl group, sec -pentyl group, 3-pentyl group, sec -iso Pentyl group, n -hexyl group, isohexyl group, sec -hexyl group, tert -hexyl group, n -heptyl group, isoheptyl group, sec -heptyl group, tert -heptyl group, n -octyl group, isooctyl group, sec -octyl group, tert -octyl group, n -nonyl group, isononyl group, sec -nonyl group, tert -nonyl group, n -decyl group, isodecyl group, sec -decyl group, tert -decyl group, etc. . In the present specification, a C ₁ -C ₆₀ alkylene group means a divalent group having the same structure as the C ₁ -C ₆₀ alkyl group.

In the present specification, the C ₂ -C ₆₀ alkenyl group refers to a monovalent hydrocarbon group including one or more carbon-carbon double bonds in the middle or at the end of the C ₂ -C ₆₀ alkyl group, and specific examples thereof include an ethenyl group and a propenyl group , butenyl groups and the like are included. In the present specification, a C ₂ -C ₆₀ alkenylene group means a divalent group having the same structure as the C ₂ -C ₆₀ alkenyl group.

In the present specification, the C ₂ -C ₆₀ alkynyl group refers to a monovalent hydrocarbon group including one or more carbon-carbon triple bonds at the middle or end of the C ₂ -C ₆₀ alkyl group, and specific examples thereof include an ethynyl group and a propynyl group etc. are included. In the present specification, a C ₂ -C ₆₀ alkynylene group means a divalent group having the same structure as the C ₂ -C ₆₀ alkynyl group.

In the present specification, the C ₁ -C ₆₀ alkoxy group refers to a monovalent group having a chemical formula of -OA ₁₀₁ (where A ₁₀₁ is the C ₁ -C ₆₀ alkyl group), and specific examples thereof include a methoxy group and an ethoxy group , isopropyloxy groups, and the like.

In the present specification, the C ₃ -C ₁₀ cycloalkyl group refers to a monovalent saturated hydrocarbon cyclic group having 3 to 10 carbon atoms, and specific examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cyclohep group. ethyl group, cyclooctyl group, adamantanyl group, norbornanyl group (or, bicyclo[2.2.1]heptyl group), bicyclo[1.1.1]phen Examples include a ethyl group (bicyclo[1.1.1]pentyl), a bicyclo[2.1.1]hexyl group, and a bicyclo[2.2.2]octyl group. In the present specification, a C ₃ -C ₁₀ cycloalkylene group refers to a divalent group having the same structure as the C ₃ -C ₁₀ cycloalkyl group.

In the present specification, the C ₁ -C ₁₀ heterocycloalkyl group refers to a monovalent cyclic group having 1 to 10 carbon atoms and further including at least one hetero atom as a ring-forming atom in addition to carbon atoms, and specific examples thereof include 1, 2,3,4-oxatriazolidinyl group (1,2,3,4-oxatriazolidinyl), tetrahydrofuranyl group (tetrahydrofuranyl), tetrahydrothiophenyl group and the like are included. In the present specification, a C ₁ -C ₁₀ heterocycloalkylene group refers to a divalent group having the same structure as the C ₁ -C ₁₀ heterocycloalkyl group.

In the present specification, a C ₃ -C ₁₀ cycloalkenyl group is a monovalent cyclic group having 3 to 10 carbon atoms, which has at least one carbon-carbon double bond in the ring, but does not have aromaticity, Specific examples thereof include a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group and the like. In the present specification, a C ₃ -C ₁₀ cycloalkenylene group refers to a divalent group having the same structure as the C ₃ -C ₁₀ cycloalkenyl group.

In the present specification, the C ₁ -C ₁₀ heterocycloalkenyl group is a monovalent cyclic group having 1 to 10 carbon atoms and further including at least one heteroatom as a ring-forming atom in addition to carbon atoms, wherein at least one double bond is formed in the ring. have Specific examples of the C ₁ -C ₁₀ heterocycloalkenyl group include a 4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, and a 2,3-dihydro A thiophenyl group etc. are included. In the present specification, the C ₁ -C ₁₀ heterocycloalkenylene group refers to a divalent group having the same structure as the C ₁ -C ₁₀ heterocycloalkenyl group.

In the present specification, a C ₆ -C ₆₀ aryl group means a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and a C ₆ -C ₆₀ arylene group refers to a carbocyclic aromatic system having 6 to 60 carbon atoms. It means a divalent group having Specific examples of the C ₆ -C ₆₀ aryl group include a phenyl group, a pentalenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a phenalenyl group, a phenanthrenyl group, anthracenyl group, and a fluoranthenyl group. , Triphenylenyl group, pyrenyl group, chrysenyl group, perylenyl group, pentaphenyl group, Heptalenyl group, naphthacenyl group, picenyl group, hexacenyl group, pentacenyl group, rubicenyl group, coronenyl group, ovalenyl group and the like are included. When the C ₆ -C ₆₀ aryl group and the C ₆ -C ₆₀ arylene group include two or more rings, the two or more rings may be condensed with each other.

In the present specification, the C ₁ -C ₆₀ heteroaryl group means a monovalent group having a heterocyclic aromatic system having 1 to 60 carbon atoms and further including at least one hetero atom as a ring-forming atom in addition to carbon atoms, and C ₁ A -C ₆₀ heteroarylene group means a divalent group having a heterocyclic aromatic system having 1 to 60 carbon atoms and further including at least one heteroatom as a ring-forming atom in addition to carbon atoms. Specific examples of the C ₁ -C ₆₀ heteroaryl group include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, a benzoquinolinyl group, an isoquinolinyl group, a benzo An isoquinolinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinolinyl group, a phenanthrolinyl group, a phthalazinyl group, a naphthyridinyl group, and the like. When the C ₁ -C ₆₀ heteroaryl group and the C ₁ -C ₆₀ heteroarylene group include two or more rings, the two or more rings may be condensed with each other.

In the present specification, a monovalent non-aromatic condensed polycyclic group includes two or more rings condensed with each other, contains only carbon as a ring-forming atom, and the entire molecule is non-aromatic. It means a monovalent group having (for example, having 8 to 60 carbon atoms). Specific examples of the monovalent non-aromatic condensed polycyclic group include an indenyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, an indenophhenanthrenyl group, an indenoanthracenyl group, and the like. A divalent non-aromatic condensed polycyclic group in the present specification means a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group.

In the present specification, a monovalent non-aromatic condensed heteropolycyclic group includes two or more rings condensed with each other, further including at least one heteroatom in addition to a carbon atom as a ring-forming atom, and a molecule as a whole It means a monovalent group having non-aromaticity (eg, having 1 to 60 carbon atoms). Specific examples of the monovalent non-aromatic heterocondensed polycyclic group include a pyrroyl group, a thiophenyl group, a furanyl group, an indolyl group, a benzoindolyl group, a naphthoindolyl group, an isoindolyl group, a benzoisoindolyl group, and a naphthoisoindolyl group. , Benzosilolyl group, benzothiophenyl group, benzofuranyl group, carbazolyl group, dibenzosilolyl group, dibenzothiophenyl group, dibenzofuranyl group, azacarbazolyl group, azafluorenyl group, azadibenzosilolyl group, azadi Benzothiophenyl group, azadibenzofuranyl group, pyrazolyl group, imidazolyl group, triazolyl group, tetrazolyl group, oxazolyl group, isoxazolyl group, thiazolyl group, isothiazolyl group, oxadiazolyl group, thia Diazolyl group, benzopyrazolyl group, benzoimidazolyl group, benzoxazolyl group, benzothiazolyl group, benzoxadiazolyl group, benzothiadiazolyl group, imidazopyridinyl group, imidazopyrimidinyl group, imidazo Triazinyl group, imidazopyrazinyl group, imidazopyridazolyl group, indenocarbazolyl group, indolocarbazolyl group, benzofurocarbazolyl group, benzothienocarbazolyl group, benzosylolocarbazolyl group, Benzoindolocarbazolyl group, benzocarbazolyl group, benzonaphthofuranyl group, benzonaphthothiophenyl group, benzonaphthosilolyl group, benzofurodibenzofuranyl group, benzofurodibenzothiophenyl group, benzothienodibenzothiophenyl group , etc. are included. A divalent non-aromatic condensed heteropolycyclic group in the present specification means a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

In the present specification, the C ₆ -C ₆₀ aryloxy group refers to -OA ₁₀₂ (where A ₁₀₂ is the C ₆ -C ₆₀ aryl group), and the C ₆ -C ₆₀ arylthio group refers to -SA ₁₀₃ (wherein , A ₁₀₃ is the C ₆ -C ₆₀ aryl group).

In the present specification, the C ₇ -C ₆₀ arylalkyl group refers to -A ₁₀₄ A ₁₀₅ (where A ₁₀₄ is a C ₁ -C ₅₄ alkylene group and A ₁₀₅ is a C ₆ -C ₅₉ aryl group), and in the present specification, C ₂ A -C ₆₀ heteroarylalkyl group refers to -A ₁₀₆ A ₁₀₇ (where A ₁₀₆ is a C ₁ -C ₅₉ alkylene group and A ₁₀₇ is a C ₁ -C ₅₉ heteroaryl group).

"R _10a "in the present specification,

heavy hydrogen (-D), -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, or a nitro group;

Heavy hydrogen, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, C ₃ -C ₆₀ carbocyclic group, C ₁ -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryl Oxy group, C ₆ -C ₆₀ Arylthio group, C ₇ -C ₆₀ Arylalkyl group, C ₂ -C ₆₀ Heteroarylalkyl group, -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 a C ₁ -C ₆₀ alkyl group, C 2 -C ₆₀ alkenyl group, C ₂ -C ₆₀ alkynyl group, or C _{1 -C 60} alkoxy group, substituted or unsubstituted with any combination thereof;

Heavy hydrogen, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, C ₁ -C ₆₀ alkyl group, C ₂ -C ₆₀ alkenyl group, C ₂ -C ₆₀ alkynyl group, C ₁ - C ₆₀ alkoxy group, C ₃ -C ₆₀ carbocyclic group, C ₁ -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryloxy group, C ₆ -C ₆₀ arylthio group, C ₇ -C ₆₀ arylalkyl group , C ₂ -C ₆₀ heteroarylalkyl group, -Si(Q ₂₁ )(Q ₂₂ )(Q ₂₃ ), -N(Q ₂₁ )(Q ₂₂ ), -B(Q ₂₁ )(Q ₂₂ ), -C( =0)(Q ₂₁ ), -S(=0) ₂ (Q ₂₁ ), -P(=0)(Q ₂₁ )(Q ₂₂ ), or unsubstituted or substituted with C ₃ - C ₆₀ carbocyclic group, C ₁ -C ₆₀ heterocyclic group, C ₆ -C ₆₀ aryloxy group, C ₆ -C ₆₀ arylthio group, C ₇ -C ₆₀ arylalkyl group, or C ₂ -C ₆₀ hetero an arylalkyl group; or

-Si(Q ₃₁ )(Q ₃₂ )(Q ₃₃ ), -N(Q ₃₁ )(Q ₃₂ ), -B(Q ₃₁ )(Q ₃₂ ), -C(=O)(Q ₃₁ ), -S (=0) ₂ (Q ₃₁ ), or -P(=0)(Q ₃₁ )(Q ₃₂ );

can be

In the present specification, Q ₁ to Q ₃ , Q ₁₁ to Q ₁₃ , Q ₂₁ to Q ₂₃ , and Q ₃₁ to Q ₃₃ are each independently hydrogen; heavy hydrogen; -F; -Cl; -Br; -I; hydroxyl group; cyano group; nitro group; C ₁ -C ₆₀ alkyl group; C ₂ -C ₆₀ alkenyl group; C ₂ -C ₆₀ alkynyl group; C ₁ -C ₆₀ alkoxy group; or a C ₃ -C ₆₀ carbocyclic group unsubstituted or substituted with heavy hydrogen, -F, a cyano group, a C ₁ -C ₆₀ alkyl group, a C ₁ -C ₆₀ alkoxy group, a phenyl group, a biphenyl group, or any combination thereof. , C ₁ -C ₆₀ heterocyclic group; C ₇ -C ₆₀ arylalkyl group; or a C ₂ -C ₆₀ heteroarylalkyl group;

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

In the present specification, the third-row transition metal is hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt) ) and gold (Au).

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

In the present specification, "biphenyl group" means "a phenyl group substituted with a phenyl group". The above "biphenyl group" belongs to a "substituted phenyl group" whose substituent is a "C ₆ -C ₆₀ aryl group".

In the present specification, "terphenyl group" means "a phenyl group substituted with a biphenyl group". The "terphenyl group" belongs to a "substituted phenyl group" whose substituent is a "C ₆ -C ₆₀ aryl group substituted with a C ₆ -C ₆₀ aryl group".

In this specification, * and *' mean a binding site with a neighboring atom in the corresponding formula or moiety, unless otherwise defined.

Hereinafter, a compound and a light emitting device according to one embodiment of the present invention will be described in more detail, for example, synthesis examples and examples. In the following synthesis example, in the expression "B was used instead of A", the molar equivalent of A and the molar equivalent of B are the same.

[Example]

Preparation Example: Preparation of electron transport layer

The above compounds ETL1 to 3 were purchased from Sigma-Aldrich.

Preparation Example 1: Preparation of ETL A

ETL A was formed by depositing compound ETL 1 to a thickness of 310 Å.

Preparation Examples 2 to 5: Preparation of ETLs B to E

ETL B to ETL E were formed in the same manner as in Preparation Example 1, except that the compound of Table 1 was deposited at a given weight ratio instead of compound ETL 1.

Evaluation Example 1: Measurement of refractive index

For the ETLs A to E manufactured through Preparation Examples 1 to 5, the refractive index according to the wavelength was measured using an elipsometer, and the results are shown in FIG. 1.

electron transport layer composition wavelength 440 nm 550 nm 640 nm ETL A ETL 1 2.06 1.97 1.93 ETL B ETL 2 1.70 1.67 1.65 ETL C ETL 3 1.41 1.40 1.40 ETL D ETL 1 + ETL 2 (5:5) 1.88 1.82 1.79 ETL E ETL 1+ ETL 2+ ETL3 (1:1:2) 1.64 1.61 1.59

Evaluation Example 2: OLED Device Optical Efficiency Simulation

Based on the refractive indices at 550 nm of ETL D and E in Table 1 (1.82 and 1.61, respectively), the refractive index according to the optical wavelength was measured using an ellipsometer, and the results are shown in FIGS. 5a to 5c, and each wavelength The maximum luminous efficiency and color coordinates in the range are shown in Table 2 below, and the luminous efficiency was calculated based on 100% of the maximum luminous efficiency value of ETL D.

electron transport layer red zone green area blue area R _x luminous efficiency G _x luminous efficiency B _x luminous efficiency ETL D (n=1.82) 0.686 100% 0.272 100% 0.038 100% ETL E (n=1.61) 0.685 107% 0.255 108% 0.040 109%

Through Table 2, ETL E including the third material has a 7% increase in luminous efficiency in the red region, 8% in the green region, and 9% in the blue region, compared to ETL D including only the first and second materials. can confirm that

Evaluation Example 3: Optical Efficiency Simulation for Blue OLED Device

Based on the refractive indices (1.82 and 1.61, respectively) at 550 nm of ETL D and E according to Evaluation Example 1, the degree of light loss in the blue device was simulated using setfos simulator, and the results are shown in Table 3 below. .

electron transport layer Percentage of light that is out-coupled to air Substrate-guide Wave-guide SPP ETL D (n=1.82) 30% 0% 52% 8% ETL E (n=1.61) 32% 0% 53% 4%

Through Table 3, the light emitting device to which ETL E including the third material is applied is compared to the light emitting device to which ETL D including only the first material and the second material is applied, by surface plasmon polariton (SPP) It can be seen that the light loss is as low as 4%, and thus the total amount of light out-coupled to air increases to 32%. Accordingly, a light emitting device to which ETL E is applied may exhibit higher luminous efficiency than a light emitting device to which ETL D is applied.

Example 1

A pixel electrode was formed on a glass substrate by patterning Ag/ITO to a thickness of 150 nm/7 nm as an anode electrode.

A hole transport layer was formed on the pixel electrode by depositing 2-TNATA to a thickness of 1200 Å.

TCTA was deposited to a thickness of 50 Å on top of the hole transport layer to form a light emitting auxiliary layer, and ADN and DPAVBi were co-deposited at a weight ratio of 98:2 on the light emitting auxiliary layer to form a 200 Å thick light emitting layer.

An electron transport layer was formed by co-evaporation of first material ETL 1, second material ETL 2, and third material ETL 3 at a weight ratio of 1:1:2 to a thickness of 310 Å on the light emitting layer, and AgMg was formed on the electron transport layer. was deposited to a thickness of 130 Å to form a counter electrode (cathode), and TPD was deposited to a thickness of 640 Å on top of the counter electrode to form a capping layer, thereby fabricating a light emitting device.

Comparative Example 1

A light emitting device was fabricated in the same manner as in Example 1, except that ETL 1 and ETL 2 were co-deposited to a thickness of 310 Å at a weight ratio of 1:1 when forming the electron transport layer.

Comparative Example 2

A light emitting device was fabricated in the same manner as in Example 1, except that ETL 2 and ETL 3 were co-deposited to a thickness of 310 Å at a weight ratio of 1:1 when forming the electron transport layer.

Comparative Example 3

A light emitting device was manufactured in the same manner as in Example 1, except that ETL 1 was deposited to a thickness of 150 Å when the electron transport layer was formed, and ETL 2 and ETL 3 were co-deposited to a thickness of 160 Å at a weight ratio of 1: 1 on top of the layer. .

Evaluation Example 4

The driving voltage and luminous efficiency of the light emitting devices prepared in Example 1 and Comparative Examples 1 to 3 were measured at a current density of 10 mA/cm 2 . The driving voltage of the light emitting device was measured using a source meter (Keithley Instrument Co., 2400 series), and the luminous efficiency was measured using a luminous efficiency measuring device C9920-2-12 manufactured by Hamamatsu Photonics. In the evaluation of luminous efficiency, luminance/current density was measured using a luminance meter with wavelength sensitivity calibration, and the evaluation results of the characteristics of the light emitting device are shown in Table 4 below.

electron transport layer Driving voltage (V) Luminous Efficiency (cd/A) luminescent color Example 1 4.47 6.81 blue Comparative Example 1 4.45 6.15 blue Comparative Example 2 12.5 0.54 blue Comparative Example 3 8.25 1.58 blue

Referring to Table 4, it can be seen that the light emitting device of Example 1 has a lower driving voltage and higher luminous efficiency than the light emitting devices of Comparative Examples 1 to 3. As such, the present invention has been described with reference to the embodiments shown in the drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

1: light emitting element
100: substrate
110: pixel electrode
111: first pixel electrode
112: second pixel electrode
113: third pixel electrode
120: hole transport region
130: middle layer
131, 132, 133: light emitting layer
141, 142, 143: resonance control layer
140 electron transport area
150: counter electrode
170: capping layer
210: buffer layer
220: active layer
230: gate insulating film
240: gate electrode
250: interlayer insulating film
260: source electrode
270: drain electrode
280: passivation layer
290: pixel defining layer
300: encapsulation
400: functional area
500: light blocking pattern

Claims (20)

a first pixel electrode, a second pixel electrode, and a third pixel electrode disposed in the first light emitting area, the second light emitting area, and the third light emitting area, respectively;
a counter electrode facing the first pixel electrode, the second pixel electrode, and the third pixel electrode; and
an intermediate layer disposed between the first pixel electrode, the second pixel electrode and the third pixel electrode and the counter electrode;
including,
The intermediate layer includes a light emitting layer and an electron transport region disposed between the light emitting layer and the counter electrode,
The light emitting layer,
a first light emitting layer disposed corresponding to the first light emitting region and emitting a first color light;
a second light emitting layer disposed to correspond to the second light emitting region and emitting a second color light; and
a third light emitting layer disposed corresponding to the third light emitting region and emitting a third color light; including,
The electron transport region includes an electron transport layer,
The electron transport layer includes a mixture of a first material, a second material, and a third material,
The first material includes an electron transport compound,
The second material includes a metal-containing compound,
The third material includes a low refractive index compound,
Wherein the first material, the second material and the third material are different from each other, light emitting element. According to claim 1,
wherein the first color light, the second color light, and the third color light are emitted by secondary resonance. According to claim 1,
The first pixel electrode, the second pixel electrode, and the third pixel electrode are anodes,
The counter electrode is a cathode,
The anode is a reflective electrode,
The cathode is a transmissive electrode or a semi-transmissive electrode, a light emitting element. According to claim 1,
The first pixel electrode, the second pixel electrode, and the third pixel electrode are anodes,
The counter electrode is a cathode,
the intermediate layer further includes a hole transport region disposed between the light emitting layer and the first pixel electrode, the second pixel electrode, and the third pixel electrode;
Wherein the hole transport region includes a hole injection layer, a hole transport layer, a light emitting auxiliary layer, an electron blocking layer, or any combination thereof. According to claim 1,
The electron transport layer has a single-layer structure consisting of a mixture of the first material, the second material and the third material. According to claim 1,
The electron transport layer and the light emitting layer are in contact with each other (directly contract), the light emitting device. According to claim 1,
The electron transport layer and the counter electrode are in contact with each other (directly contract), a light emitting device. According to claim 1,
The refractive index of the electron transport layer is 1.65 or less, the light emitting device. According to claim 1,
The electron-transporting compound includes _at least one π electron-deficient nitrogen-containing C _{1 -C 60} cyclic group, a light emitting device. According to claim 1,
The electron-transporting compound is a fluoro group-non-containing (fluoro-free) compound, a light emitting device. According to claim 1,
The metal-containing compound is 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. A light emitting device comprising a. According to claim 1,
The refractive index of the low refractive index compound is 1.45 or less, the light emitting element. According to claim 1,
Wherein the low refractive index compound includes at least one fluoro group (-F). According to claim 1,
The low refractive index compound is a polymer compound, a light emitting device. According to claim 13,
The polymer compound is an oligomer-polymer having a molecular weight of 5000 or less, a light emitting device. According to claim 1,
The low refractive index compound is a compound represented by Formula 1 below, a light emitting device:
<Formula 1>

In Formula 1,
T ₁ is C(Z ₁₁ )(Z ₁₂ ), Si(Z ₁₁ )(Z ₁₂ ), O or S;
d1 is an integer from 0 to 3;
Y ₁ is C(Z ₂₁ ), Si(Z ₂₁ ), O or S;
Y ₂ is C(Z ₂₂ ), Si(Z ₂₂ ), O or S;
Y ₃ is C(Z ₂₃ )(Z ₂₄ ), Si(Z ₂₃ )(Z ₂₄ ), O or S;
Y ₄ is C(Z ₂₅ )(Z ₂₆ ), Si(Z ₂₅ )(Z ₂₆ ), O or S;
Y ₅ is C(Z ₂₇ )(Z ₂₈ ), Si(Z ₂₇ )(Z ₂₈ ), O or S;
d2 is one of the integers from 0 to 3;
T ₃ is C(Z ₃₁ )(Z ₃₂ ), Si(Z ₃₁ )(Z ₃₂ ), O or S;
d3 is one of the integers from 0 to 3;
The sum of d1, d2 and d3 is an integer greater than or equal to 1;
Z ₁₁ , Z ₁₂ , Z ₂₁ to Z ₂₈ , Z ₃₁ and Z ₃₂ are each independently hydrogen, deuterium or -F; or
a C ₁ -C ₆₀ alkyl group, a C ₂ -C ₆₀ alkenyl group, a C ₂ -C ₆₀ alkynyl group, or a C ₁ -C ₆₀ alkoxy group, substituted with at least one -F; ego,
n1 is one of integers from 10 to 500, a light emitting element. According to claim 1,
A mixture of the first material, the second material and the third material is uniformly present in the electron transport layer. According to claim 1,
The weight part of the third material is 30 parts by weight or more and 50 parts by weight or less based on 100 parts by weight of the total mixture, the light emitting element. According to claim 1,
The weight part of the second material is 40 parts by weight or more and 60 parts by weight or less with respect to a total of 100 parts by weight of the first material and the second material. An electronic device comprising the light emitting element of any one of claims 1 to 19.

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