KR102228323B1 - Compound and organic light emitting device comprising the same - Google Patents

Abstract

상기 화학식 1에서, G₁ 및 G₂는 각각 독립적으로, 치환 또는 비치환된 C4 내지 C24로 이루어진 방향족 고리화합물, 치환 또는 비치환된 C4 내지 C24 내에 N1 내지 N3 또는 S1 및 S2가 각각 또는 함께 이루어질 수 있다.The compound according to an embodiment of the present invention is characterized in that it is represented by the following formula (1).
[Formula 1]

In Formula 1, G ₁ and G ₂ are each independently a substituted or unsubstituted aromatic cyclic compound consisting of C4 to C24, and N1 to N3 or S1 and S2 are each or together in a substituted or unsubstituted C4 to C24. I can.

Description

Compound and organic electroluminescent device comprising the same {COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME}

The present invention relates to a compound used in an organic light emitting device, and more particularly, to a compound capable of improving luminous efficiency and lowering a driving voltage, and an organic light emitting device including the same.

A video display device that embodies a variety of information on a screen is a core technology in the information and communication era, and is evolving in a direction of thinner, lighter, portable, and high-performance. With the recent development of the information society, as the demand for various types of display devices increases, LCD (Liquid Crystal Display), PDP (Plasma Display Panel), ELD (Electro Luminescent Display), FED (Field Emission Display), OLED ( Organic Light Emitting Diode) and other flat panel display devices are being actively researched.

Among them, the organic light emitting device is a device that emits light while electrons and holes form a pair and then disappear when charge is injected into the organic light emitting layer formed between the anode and the cathode. The organic light emitting device can be formed on a flexible transparent substrate such as plastic, and can be driven at a lower voltage than a plasma display panel or an inorganic electroluminescent (EL) display and consumes relatively little power. It has the advantage of being small and excellent in color.

In the organic electroluminescent device, holes injected from the anode pass through the hole transport layer to form excitons in the emission region. The formed excitons are transferred to the dopant by physical methods by energy transfer. In order to improve the efficiency of the transfer process, the energy level of the host must be sufficiently greater than the energy level of the dopant so that reverse energy transfer does not occur. The quantum efficiency can be maximized in the organic electroluminescent device only when the occurrence of reverse energy transfer is prevented. In addition, in order to improve luminous efficiency, a double emitting layer is also laminated in the organic light emitting device. In order to form the double light emitting layer, a host having hole transport characteristics and a host having electron transport characteristics in the same dopant are used, and it has been reported that the luminous efficiency is high so far.

As another method, a technology using a physical phenomenon called Thermally Activated Delay Fluorescence (TADF) proposed by Professor Adachi has been recently reported, but it is difficult to put it into practical use in organic electroluminescent display devices as the problem of improving the lifespan is undesired. There is this. Therefore, there is a need for a new method for improving the efficiency of the organic electroluminescent device.

The present invention provides a compound capable of improving the luminous efficiency of an organic light emitting device and lowering a driving voltage, and an organic light emitting device including the same.

In order to achieve the above object, the compound according to an embodiment of the present invention is characterized in that it is represented by the following formula (1).

[Formula 1]

In Formula 1, G ₁ and G ₂ are each independently a substituted or unsubstituted aromatic cyclic compound consisting of C4 to C24, and N1 to N3 or S1 and S2 are each or together in a substituted or unsubstituted C4 to C24. I can.

The _{substituent of G 1} or G ₂ is an alkyl group such as methyl, ethyl, propyl, isopropyl, octyl, and t-butyl. , Methoxy (methoxy), ethoxy (ethoxy), butoxy (butoxy), such as alkoxy (alkoxy) group, trimethylsilyl (trimethylsilyl), characterized in that any one selected from the group consisting of fluorine and chlorine.

The G ₁ and G ₂ are characterized in that any one selected from the compounds shown below.

The compound is characterized in that any one selected from the compounds shown below.

In addition, the organic light emitting device according to an embodiment of the present invention is an organic light emitting device including at least two light emitting layers between an anode and a cathode, and includes an intermediate layer positioned between the light emitting layers and in contact with each of the light emitting layers. And, the intermediate layer is characterized in that it contains the compound.

The two or more light-emitting layers are characterized in that they emit light of the same or different colors.

Each of the two or more light emitting layers and the intermediate layer is characterized in that the thickness of 1 to 30nm.

It characterized in that it further comprises a charge generation layer positioned between the anode and the cathode.

When the compound of the present invention is applied to the first intermediate layer and the second intermediate layer, the excitons formed in the emission layers are confined to prevent the excitons from emitting light other than the emission layer. Accordingly, there is an advantage of improving the luminous efficiency of the organic light emitting device and lowering the driving voltage.

1 is a view showing an organic light emitting device according to an embodiment of the present invention.
2 is a view showing an organic light emitting device according to a second embodiment of the present invention.
3 is a graph showing the relationship between wavelength and light emission intensity of organic light emitting devices manufactured according to Examples 1 to 4 and Comparative Examples of the present invention.
4 is a graph showing the relationship between voltage and current of organic light emitting devices manufactured according to Examples 1 to 4 and Comparative Examples of the present invention.
5 is a graph showing the relationship between luminance and current efficiency of organic light emitting devices manufactured according to Examples 1 to 4 and Comparative Examples of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an organic light emitting device according to an embodiment of the present invention.

Referring to FIG. 1, an organic light emitting diode 100 according to an embodiment of the present invention includes an anode 110, a hole injection layer 120, a hole transport layer 130, a first emission layer 140, and an intermediate layer 150. ), a second emission layer 160, an electron transport layer 170, an electron injection layer 180, and a cathode 190.

The anode 110 is an electrode for injecting holes, and may be any one of indium tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO) having a high work function. In addition, when the anode 110 is a reflective electrode, the anode 110 includes a reflective layer made of any one of aluminum (Al), silver (Ag), or nickel (Ni) under a layer made of any one of ITO, IZO, or ZnO. It may contain more.

The hole injection layer 120 may play a role of smoothly injecting holes from the anode 110 to the light emitting layer 140, and cupper phthalocyanine (CuPc), poly(3,4)-ethylenedioxythiophene (PEDOT), PANI (polyaniline) and NPD (N,N-dinaphthyl-N,N'-diphenyl benzidine) may be formed of one or more selected from the group consisting of, but is not limited thereto. The hole injection layer 120 may have a thickness of 1 to 150 nm. Here, when the thickness of the hole injection layer 120 is 1 nm or more, there is an advantage of preventing deterioration of the hole injection characteristics, and when the thickness of the hole injection layer 120 is 150 nm or less, the thickness of the hole injection layer 120 is too thick to prevent the movement of holes. In order to improve, there is an advantage of preventing an increase in the driving voltage.

The hole transport layer 130 serves to facilitate the transport of holes, and NPD (N,N-dinaphthyl-N,N'-diphenyl benzidine), TPD (N,N'-bis-(3-methylphenyl)- N,N'-bis-(phenyl)-benzidine), s-TAD and MTDATA(4,4',4"-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine) The hole transport layer 130 may have a thickness of 1 to 150 nm, but if the hole transport layer 130 has a thickness of 5 nm or more, the hole transport property may be deteriorated. There is an advantage that can be prevented, and if it is 150 nm or less, there is an advantage in that the thickness of the hole transport layer 130 is too thick to prevent an increase in the driving voltage in order to improve the movement of holes.

The first emission layer 140 and the second emission layer 160 may be formed of materials that emit red, green, and blue, respectively, and may be formed using phosphorescent or fluorescent materials.

When the first emission layer 140 or the second emission layer 160 is red, it includes a host material including carbazole biphenyl (CBP) or mCP (1,3-bis (carbazol-9-yl), and PIQIr ( acac) (bis (1-phenylisoquinoline) acetylacetonate iridium), PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) It may be made of a phosphorescent material including a dopant including one or more, and unlike this, may be made of _{a fluorescent material including PBD:Eu(DBM) 3} (Phen) or Perylene, but is not limited thereto.

When the first emission layer 140 or the second emission layer 160 is green, a dopant containing a host material containing CBP or mCP and containing Ir(ppy)3 (fac tris(2-phenylpyridine)iridium) It may be made of a phosphorescent material including a material, and unlike this, may be made of a fluorescent material including Alq3 (tris(8-hydroxyquinolino)aluminum), but is not limited thereto.

When the first emission layer 140 or the second emission layer 160 is blue, it includes a host material including CBP or mCP, and includes a dopant material including _{(4,6-F 2} ppy) _{2 Irpic.} It may be made of a phosphor, and, unlike this, spiro-DPVBi, spiro-6P, distillbenzene (DSB), distrylarylene (DSA), PFO-based polymer and PPV-based polymer containing any one selected from the group consisting of It may be made of a fluorescent material, but is not limited thereto.

An intermediate layer 150 is positioned between the first emission layer 140 and the second emission layer 160. The intermediate layer 150 serves to emit light in the light emitting region by confining excitons formed by combining holes and electrons between the first light emitting layer 140 and the second light emitting layer 160, represented by Formula 1 below. It consists of compounds.

[Formula 1]

In Formula 1, G ₁ and G ₂ are each independently a substituted or unsubstituted aromatic cyclic compound consisting of C4 to C24, and N1 to N3 or S1 and S2 are each or together in a substituted or unsubstituted C4 to C24. .

In addition, the _{substituent of G 1} or G ₂ is alkyl such as methyl, ethyl, propyl, isopropyl, octyl, butyl, and the like. ) Group, an alkoxy group such as methoxy, ethoxy, butoxy, etc., trimethylsilyl, fluorine, and chlorine.

Here, the G ₁ and G ₂ consist of any one selected from the compounds shown below.

The compound of the present invention consists of any one selected from the compounds shown below.

The compound used in the intermediate layer 150 of the present invention is made of materials with a wide energy band gap, and confines excitons formed in the first and second emission layers 140 and 160 so that excitons are not in the emission layer. It prevents it from emitting light. Accordingly, there is an advantage of improving the luminous efficiency of the organic light emitting device and lowering the driving voltage.

The electron transport layer 170 serves to facilitate the transport of electrons, and consists of at least one selected from the group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq. It can be, but is not limited thereto. The thickness of the electron transport layer 170 may be 1 to 50 nm. Here, if the thickness of the electron transport layer 170 is 1 nm or more, there is an advantage of preventing deterioration of the electron transport characteristics, and if the thickness of the electron transport layer 170 is 50 nm or less, the thickness of the electron transport layer 170 is too thick to improve the movement of electrons. There is an advantage in that it is possible to prevent an increase in the dangerous driving voltage.

The electron injection layer 180 serves to facilitate electron injection, and Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, or SAlq may be used, but is not limited thereto. The electron injection layer 180 may have a thickness of 1 to 50 nm. Here, when the thickness of the electron injection layer 180 is 1 nm or more, there is an advantage of preventing deterioration of the electron injection characteristics, and when the thickness of the electron injection layer 180 is 50 nm or less, the thickness of the electron injection layer 180 is too thick to prevent the movement of electrons. In order to improve, there is an advantage of preventing an increase in the driving voltage.

The cathode 190 is an electron injection electrode, and may be made of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof having a low work function. Here, the cathode 190 may be formed to have a thickness thin enough to transmit light when the organic electroluminescent device has a front or double-sided light emitting structure, and when the organic electroluminescent device has a rear light emitting structure, it may reflect light. It can be formed as thick as possible.

2 is a view showing an organic light emitting device according to a second embodiment of the present invention. In the following, descriptions of the same components as those of the first embodiment will be omitted.

Referring to FIG. 2, the organic light emitting device 200 of the present invention includes stacks ST1 and ST2 between the anode 210 and the cathode 310 and charges between the stacks ST1 and ST2. It includes a generation layer 260.

In more detail, the first stack ST1 constitutes one light emitting device unit, and includes a first emission layer 240a and a second emission layer 240b. The first emission layer 240a and the second emission layer 240b may emit light of the same color or different colors. For example, when the first emission layer 240a and the second emission layer 240b emit blue light, the blue emission materials described in the first embodiment may be used.

In the first stack ST1 of the present invention, a first intermediate layer 245 is positioned between the first emission layer 240a and the second emission layer 240b. The first intermediate layer 245 serves to emit light in the emission region by confining excitons formed by combining holes and electrons between the first emission layer 240a and the second emission layer 240b. It is made of the same material as the compound described in the examples. Since the compound has been described in detail above, the description thereof will be omitted here.

The first stack ST1 further includes a hole injection layer 220 and a first hole transport layer 230 between the anode 210 and the first emission layer 240a. The hole injection layer 220 and the first hole transport layer 230 have the same configuration as the hole injection layer and the hole transport layer of the first embodiment described above. In addition, the first stack ST1 further includes a first electron transport layer 250 on the second emission layer 240. The first electron transport layer 250 has the same configuration as the electron transport layer of the first embodiment described above. Therefore, on the anode 210, the hole injection layer 220, the first hole transport layer 230, the first emission layer 240a, the first intermediate layer 245, the second emission layer 240b, and the first electron transport layer 250 A first stack ST1 including) is configured.

A charge generation layer (CGL) 260 is positioned on the first stack ST1. The charge generation layer 260 may be a PN junction charge generation layer in which the N-type charge generation layer 260N and the P-type charge generation layer 260P are bonded. At this time, the PN junction charge generation layer 260 generates electric charge or separates it into holes and electrons to inject electric charges into each of the light emitting layers. That is, the N-type charge generation layer 260N supplies electrons to the first emission layer 240a and the second emission layer 240b adjacent to the anode, and the P-type charge generation layer 260P is formed of the second stack ST2. By supplying holes to the emission layer, the luminous efficiency of the organic electroluminescent device including a plurality of emission layers can be further increased, and the driving voltage can also be lowered.

The P-type charge generation layer 260P may be formed of a metal or an organic material doped with a P-type. Here, the metal may be made of one or two or more alloys selected from the group consisting of Al, Cu, Fe, Pb, Zn, Au, Pt, W, In, Mo, Ni, and Ti. In addition, the P-type dopant and the host material used for the P-type doped organic material may be a commonly used material. For example, the P-type dopant is 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), a derivative of tetracyanoquinodimethane, iodine , FeCl ₃ , FeF ₃ and SbCl _{5 It} may be one material selected from the group consisting of. In addition, the host is N,N'-di(naphthalen-1-yl)-N,N-diphenyl-benzidine (NPB), N,N'-diphenyl-N,N'-bis(3-methylphenyl) It may be one material selected from the group consisting of -1,1-biphenyl-4,4'-diamine (TPD) and N,N',N'-tetranaphthyl-benzidine (TNB).

The N-type charge generation layer 260N may be formed of a metal or an organic material doped with an N-type. Here, the metal may be one material selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, La, Ce, Sm, Eu, Tb, Dy, and Yb. In addition, materials of the N-type dopant and the host used in the N-type doped organic material may be materials that are commonly used. For example, the N-type dopant may be an alkali metal, an alkali metal compound, an alkaline earth metal or an alkaline earth metal compound. In detail, the N-type dopant may be one selected from the group consisting of Cs, K, Rb, Mg, Na, Ca, Sr, Eu, and Yb. The host material may be one material selected from the group consisting of tris(8-hydroxyquinoline)aluminum, triazine, hydroxyquinoline derivatives, benzazole derivatives, and silol derivatives.

Meanwhile, a second stack ST2 including a third emission layer 280a and a fourth emission layer 280b is positioned on the charge generation layer 260. The third emission layer 280a and the fourth emission layer 280b may emit light of the same color or different colors. For example, when the third emission layer 280a and the fourth emission layer 280b emit yellow light, the third emission layer 280a and the fourth emission layer 280b are CBP(4,4'-N,N'-dicarbazolebiphenyl). ) Or Balq (Bis(2-methyl-8-quinlinolato-N1,O8)-(1,1'-Biphenyl-4-olato)aluminium) Can be done.

In the second stack ST2 of the present invention, a second intermediate layer 285 is positioned between the third emission layer 280a and the fourth emission layer 280b. The second intermediate layer 285 serves to emit light in the emission region by confining excitons formed by combining holes and electrons between the third emission layer 280a and the fourth emission layer 280b. It is made of the same material as the intermediate layer 285. The second stack ST2 further includes a second hole transport layer 270 between the charge generation layer 260 and the third emission layer 280a. The second hole transport layer 270 has the same configuration as the first hole transport layer 230 described above.

In addition, the second stack ST2 further includes a second electron transport layer 300 on the fourth emission layer 280b, and the second electron transport layer 300 is a first electron transport layer of the first stack ST1 described above. It has the same configuration as (250). Accordingly, the second hole transport layer 270, the third emission layer 280a, the second intermediate layer 285, the fourth emission layer 280b, and the second electron transport layer 300 are formed on the charge generation layer 260. 2 Compose the stack (ST2). A cathode 310 is provided on the second stack ST2 to configure the organic light emitting diode according to the second embodiment of the present invention.

As described above, by applying the compound of the present invention to the first intermediate layer and the second intermediate layer, the excitons formed in the light emitting layers are confined to prevent the excitons from emitting light other than the light emitting layer. Accordingly, there is an advantage of improving the luminous efficiency of the organic light emitting device and lowering the driving voltage.

Hereinafter, a synthesis example of the compound of the present invention and an organic electroluminescent device including the same will be described in detail in the following synthesis examples and examples. However, the following examples are merely illustrative of the present invention, and the present invention is not limited to the following examples.

Synthesis example

1) Preparation of compound A

In a 2-neck round bottom flask, 1-bromo-4-(1-bromonaphthalen-4-yl)naphthalene) (2g, 4.85mmol) and Phenanthren-9-yl-9-boronic acid (2.37 g, 10.7 mmol) was added to 80 mL of anhydrous tetrahydrofuran and stirred. Tetrakis (triphenylphosphine) palladium (0.28g, 5mol%), potassium carbonate (K ₂ CO ₃ , 20g), and 80 mL of distilled water were added and refluxed at 100° C. for 24 hours. When the reaction is complete, tetrahydrofuran is removed and the resulting solid is filtered off. Recrystallization was performed using dichloromethane and methanol to obtain compound A (2.30 g, 78%).

2) Preparation of compound B

In a 2-neck round bottom flask, add 1-bromo-4-(1-bromonaphthalene-4-yl)naphthalene (2g, 4.85mmol) and carbazole (1.79g, 10.7mmo) to 5mol% CuI, 10mol. % Trans-1,4-diaminocyclohexane, K ₃ PO ₄ (2.06 g, 9.70 mmol) was added to 80 ml dimethylformamide (DMF) and refluxed at 100° C. for 24 hours. When the reaction is complete, purified water is added to the flask and the resulting solid is filtered. Recrystallization was performed using dichloromethane and methanol to obtain compound B (2.21 g, 78%).

3) Preparation of compound C

In a 2-neck round bottom flask, 1-bromo-4- (1-bromonaphthalene-4-yl) naphthalene (2 g, 4.85 mmol) and 2-dibenzothiophenboronic acid (2.44 g). , 10.7mmol) was added to 80 mL of anhydrous tetrahydrofuran and stirred. Tetrakis (triphenylphosphine) palladium (0.28g, 5mol%), potassium carbonate (20g), and 80 mL of distilled water were added and refluxed at 100° C. for 24 hours. When the reaction is complete, tetrahydrofuran is removed and the produced solid is filtered off. Recrystallization was performed using dichloromethane and methanol to obtain compound C (2.04g, 68%).

4) Preparation of compound D

In a 2-neck round bottom flask, 1-bromo-4- (1-bromonaphthalene-4-yl) naphthalene (2 g, 4.85 mmol) and N-phenyl-3-carbozolylboronic acid (N-phenyl-3- Carbazolylboronic acid) (3.07g, 10.7mmol) was added to 80 mL of anhydrous tetrahydrofuran and stirred. Tetrakis (triphenylphosphine) palladium (0.28g, 5mol%), potassium carbonate (20g), and 80 mL of distilled water were added and refluxed at 100° C. for 24 hours. When the reaction is complete, tetrahydrofuran is removed and the resulting solid is filtered off. Recrystallization was performed using dichloromethane and methanol to obtain compound D (2.61 g, 73%).

Hereinafter, an example in which an organic electroluminescent device is manufactured using the compounds A, B, C, and D of the present invention prepared in the above synthesis example as an intermediate layer will be described.

<Example 1>

It was washed after patterning so that the light emitting area of the ITO glass had a size of 3 mm × 3 mm. After mounting the substrate in a vacuum chamber, the base pressure was 1x10 ^-6 torr, and then DNTPD was formed to a thickness of 700Å as a hole injection layer on the anode ITO, and α-NPD was formed to a thickness of 300Å as a hole transport layer. , Dopant BD-1 as a dopant to MADN as a first emission layer at a doping concentration of 4% to form a thickness of 50 Å, compound A as an intermediate layer to a thickness of 50 Å, and MADN as a host as a second emission layer Dopant BD-1 was doped with a doping concentration of 4% to form a thickness of 50 Å, Alq ₃ was formed as an electron transport layer to a thickness of 125 Å, LiF was formed as an electron injection layer to a thickness of 5 Å, and Al as a cathode. The organic electroluminescent device was manufactured by sequentially forming to a thickness of 1000Å.

<Example 2>

Under the same process conditions as in Example 1 described above, an organic electroluminescent device was manufactured by only differently forming an intermediate layer with Compound B.

<Example 3>

Under the same process conditions as in Example 1 described above, an organic electroluminescent device was manufactured by only differently forming the intermediate layer with Compound C.

<Example 4>

Under the same process conditions as in Example 1 described above, an organic electroluminescent device was manufactured by only differently forming the intermediate layer with Compound D.

<Comparative Example>

Under the same process conditions as in Example 1 described above, the organic electroluminescent device was formed to a thickness of 300 Å by doping the dopant BD-1 to the host MADN as a single light emitting layer without formation of an intermediate layer at a doping concentration of 4%. Was produced.

The driving voltage, luminous efficiency, quantum efficiency, luminance and color coordinates of the organic electroluminescent devices manufactured according to the above-described Examples 1 to 4 and Comparative Examples were measured and shown in Table 1 below, and the relationship between the wavelength and the luminous intensity is shown in FIG. The relationship between voltage and current is shown in FIG. 4, and the relationship between luminance and current efficiency is shown in FIG. 5. (At this time, the current of the organic electroluminescent device was 10 mA/cm 2 .)

# Driving voltage
(V) Luminous efficiency Quantum efficiency
(%) Luminance
(Cd/㎡) Color coordinates Cd/A lm/W CIE_x CIE_y Comparative example 5.41 4.29 2.49 3.68 428.5 0.138 0.156 Example 1 4.80 5.53 3.62 5.83 552.6 0.137 0.115 Example 2 4.63 4.51 3.06 4.69 450.7 0.139 0.117 Example 3 4.37 5.83 4.19 6.03 582.9 0.137 0.119 Example 4 4.58 5.84 4.00 5.64 584.3 0.135 0.132

Referring to Table 1 and FIGS. 3 to 5, Examples 1 to 4 of the present invention exhibit color coordinates equivalent to those of the Comparative Example, while the driving voltage was reduced compared to the Comparative Example, and luminous efficiency, quantum efficiency, and luminance were improved. .

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above is in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art. It will be appreciated that it can be implemented. Therefore, the embodiments described above are illustrative in all respects and should be understood as non-limiting. In addition, the scope of the present invention is indicated by the claims to be described later rather than the detailed description. In addition, all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: organic light emitting device 110: anode
120: hole injection layer 130: hole transport layer
140: first light emitting layer 150: intermediate layer
160: second emission layer 170: electron transport layer
180: electron injection layer 190: cathode

Claims (10)

A compound characterized in that it is represented by the following formula (1).
[Formula 1]

In Formula 1,
G ₁ and G ₂ are each independently selected from the group consisting of an unsubstituted or substituted dibenzofuranyl group and an unsubstituted or substituted dibenzothiophenyl group.
The method of claim 1,
The _{substituent of G 1} or G ₂ is an alkyl selected from methyl, ethyl, propyl, isopropyl, octyl, and t-butyl. group; An alkoxy group selected from methoxy, ethoxy and butoxy; Trimethylsilyl; Fluorine; And any one selected from the group consisting of chlorine.
The method of claim 1,
Each of G ₁ and G ₂ is a compound characterized in that any one selected from the substituents shown below.

The method of claim 1,
The compound is a compound, characterized in that any one selected from the compounds shown below.

In the organic electroluminescent device comprising at least two or more light emitting layers between an anode and a cathode,
An organic electroluminescent device comprising an intermediate layer positioned between the emission layers and in contact with each of the emission layers, wherein the intermediate layer includes the compound according to any one of claims 1 to 4.
The method of claim 5,
The organic electroluminescent device, characterized in that the two or more light emitting layers emit light of the same or different colors from each other.
The method of claim 5,
The organic electroluminescent device, characterized in that each of the two or more light emitting layers and the intermediate layer has a thickness of 1 to 30 nm.
The method of claim 5,
An organic electroluminescent device, further comprising a charge generation layer positioned between the anode and the cathode. In the organic electroluminescent device comprising at least two or more light emitting layers between an anode and a cathode,
An organic light-emitting device comprising an intermediate layer positioned between the emission layers and in contact with the emission layers, wherein the intermediate layer includes a compound having a structure represented by Formula 1 below.
[Formula 1]

In Formula 1,
G ₁ and G ₂ are each independently selected from the group consisting of an unsubstituted or substituted dibenzofuranyl group and an unsubstituted or substituted dibenzothiophenyl group.
The organic electroluminescent device according to claim 9, wherein G ₁ and G ₂ are each unsubstituted or substituted dibenzothiophenyl group.

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