KR102188893B1 - Host compounds and organic light emitting diode devices comprising the same - Google Patents

Abstract

상기 화학식 1에서, X 및 Y는 각각 독립적으로 치환 또는 비치환된 아릴기 또는 치환 또는 비치환된 아릴아민으로 이루어진다.The host compound according to an embodiment of the present invention is characterized by represented by the following formula (1).
[Formula 1]

In Formula 1, X and Y are each independently a substituted or unsubstituted aryl group or a substituted or unsubstituted arylamine.

Description

Host compound and organic electroluminescent device containing the same {HOST COMPOUNDS AND ORGANIC LIGHT EMITTING DIODE DEVICES COMPRISING THE SAME}

The present invention relates to an organic light-emitting device, and more particularly, to a host compound capable of lowering a driving voltage and implementing a simple device structure, and an organic light-emitting device including the same.

Video display devices that implement a variety of information on a screen are a core technology in the information and communication era, and are developing in the 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 an organic light emitting layer formed between an anode and a 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 is small and has the advantage of excellent color.

There are three methods for improving the efficiency, lifespan, and color of the organic light emitting device described above, such as efficient energy transfer from the host to the dopant, optimizing the energy level between each layer, and charge balance. In particular, in order to increase device efficiency, a recombination zone in which the charge balance between holes and electrons is improved and electrons and holes meet to form excitons must be formed in the emission layer. However, in the case of most organic light emitting devices currently being developed or mass-produced, at least two to three layers are used to reduce the hole injection barrier between the anode and the light emitting layer, so it is still a barrier between each layer. They exist. Accordingly, a problem of power consumption has emerged due to a decrease in device efficiency and an increase in driving voltage.

In addition, if only the dopant is used, the color purity and efficiency are degraded due to the formation of excimer between the dopants and self-quenching, so the host & dopant system is currently being applied, but the dopant and host deposition process efficiency There is a problem with

The present invention provides a host compound capable of lowering a driving voltage and implementing a simple device structure, and an organic light emitting device including the same.

In order to achieve the above object, the host 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, X and Y are each independently a substituted or unsubstituted aryl group or a substituted or unsubstituted arylamine.

Each of X and Y is independently a phenyl group, a naphthyl group, a terphenyl group, a xylene group, a triphenylamine group, a diphenylamine group, and a substituent thereof.

The X and Y are characterized in that any one selected from the compounds represented by the following formula (2).

The host compound is characterized in that it is any one selected from the following compounds.

In addition, in the organic light emitting device according to an embodiment of the present invention, in an organic light emitting device including at least one organic layer formed between an anode and a cathode, the organic layer includes the host compound.

The organic layer is characterized in that at least one of a hole injection layer, a hole transport layer, and an emission layer.

The host compound is characterized in that it is included in all of the hole injection layer, the hole transport layer and the light emitting layer.

The hole injection layer further includes HATCN, and the emission layer further includes a dopant.

The hole injection layer further comprises HATCN, and the light emitting layer is characterized in that it consists only of the host compound.

The organic electroluminescent device according to an embodiment of the present invention is composed of a host compound in which the hole injection layer, the hole transport layer, and the emission layer are the same, and there is no hole injection barrier between the hole injection layer, the hole transport layer, and the emission layer, so that the driving voltage of the device is lowered and the luminous efficiency is improved. Can be improved. In addition, by forming a hole injection layer, a hole transport layer, and a light emitting layer with the same host compound, there is an advantage of reducing material cost and equipment investment cost.

1 is a view showing an organic light emitting device of the present invention.
Figure 2 is a schematic diagram showing an organic light emitting device according to the first embodiment of the present invention.
3 is a schematic diagram showing an organic electroluminescent device according to a second embodiment of the present invention.
4 is a graph showing the UV absorption spectrum of the host compounds FH-1 and FH-2 of the present invention and the PL spectrum measured at room temperature.

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 electroluminescent device of the present invention, FIG. 2 is a schematic diagram showing an organic electroluminescent device according to a first embodiment of the present invention, and FIG. 3 is an organic electric field according to a second embodiment of the present invention. It is a schematic diagram showing a light emitting device.

An organic light emitting device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 as follows. The organic electroluminescent device 100 includes an anode 110, a hole injection layer 120, a hole transport layer 130, a light emitting layer 140, an electron transport layer 150, an electron injection layer 160, and a cathode 170. can do.

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 (HIL) 120 serves to smoothly inject holes from the anode 110 to the light emitting layer 140, and the hole transport layer (HTL) 130 It plays a role of smoothly transporting holes, and the emission layer (EML) 140 is a region where holes and electrons meet to form excitons to substantially emit light. In the first embodiment of the present invention, the hole injection layer 120, the hole transport layer 130, and the emission layer 140 include a host compound represented by Formula 1 below.

[Formula 1]

In Formula 1, X and Y are each independently a substituted or unsubstituted aryl group or a substituted or unsubstituted arylamine, and X and Y are each independently a phenyl group, a naphthyl group, a terphenyl group, a xylene group , A triphenylamine group, a diphenylamine group, and any one selected from a substituent thereof. For example, X and Y are made of any one selected from compounds represented by the following formula (2).

The host compound consists of any one selected from the following compounds.

The hole injection layer 120 is doped with HATCN (1,4,5,8,9,11-hexaazatriphenylene-hexanitrile) to improve hole injection capability. The thickness of the hole injection layer 120 may be 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 improve the movement of holes. To do this, there is an advantage of preventing an increase in the driving voltage. In addition, the thickness of the hole transport layer 130 may be 1 to 150 nm. Here, if the thickness of the hole transport layer 130 is 5 nm or more, there is an advantage of preventing deterioration of the hole transport characteristics, and if it is 150 nm or less, the thickness of the hole transport layer 130 is too thick to improve the movement of holes. There is an advantage of preventing an increase in the driving voltage.

The emission layer 140 is an emission layer that emits any one color selected from red, green, and blue, and may include a dopant corresponding to a color to be emitted. For example, when the emission layer 140 emits red light, PIQIr(acac)(bis(1-phenylisoquinoline)acetylacetonate iridium), PQIr(acac)(bis(1-phenylquinoline)acetylacetonate iridium), PQIr(tris(1) -Phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) may be made of a phosphor containing a dopant containing at least one selected from the group consisting of, unlike PBD: Eu (DBM) ₃ (Phen) or Perylene It may be made of a fluorescent material, but is not limited thereto. In addition, when the light-emitting layer 140 emits green light, it may be made of a phosphorescent material including a dopant material including Ir(ppy)3 (fac tris(2-phenylpyridine)iridium), and unlike this, Alq3(tris( 8-hydroxyquinolino)aluminum) may be formed of a fluorescent material including, but is not limited thereto. In addition, when the light-emitting layer 140 emits blue light, it may be made of a phosphorescent material including a dopant material containing (4,6-F ₂ ppy) ₂ Irpic. Unlike this, spiro-DPVBi, spiro-6P, It may be made of a fluorescent material including any one selected from the group consisting of distillbenzene (DSB), distrylarylene (DSA), PFO-based polymer, and PPV-based polymer, but is not limited thereto.

The organic electroluminescent device according to the first embodiment of the present invention has a light emitting layer 140 doped with a dopant in a host compound, so that energy transfer of the light emitting layer such as triplet-triplet fusion and poester energy transfer by a host-dopant system Light emission is achieved by

On the other hand, the electron transport layer 150 plays a role of facilitating the transport of electrons, and at least one selected from the group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq. It may be made, but is not limited thereto. The thickness of the electron transport layer 150 may be 1 to 50 nm. Here, if the thickness of the electron transport layer 150 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 150 is 50 nm or less, the thickness of the electron transport layer 150 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 (EIL) 160 serves to facilitate electron injection, and Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq or SAlq can be used. However, it is not limited thereto. On the other hand, the electron injection layer 160 may be made of a metal compound, and the metal compound is, for example, LiQ, LiF, NaF, KF, RbF, CsF, FrF, BeF ₂ , MgF ₂ , CaF ₂ , SrF ₂ , BaF ₂ And RaF ₂ may be any one or more selected from the group consisting of, but is not limited thereto. The thickness of the electron injection layer 160 may be 1 to 50 nm. Here, when the thickness of the electron injection layer 160 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 160 is 50 nm or less, the thickness of the electron injection layer 160 is too thick to prevent the movement of electrons. There is an advantage of preventing an increase in the driving voltage to improve.

The cathode 170 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 170 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.

In the organic electroluminescent device according to the first embodiment of the present invention described above, the hole injection layer 120, the hole transport layer 130, and the emission layer 140 are made of the above-described host compound, but the hole injection layer 120 has HATCN. A structure in which the dopant is doped and the light emitting layer 140 is doped with a dopant is disclosed. Accordingly, since there is no hole injection barrier between the hole injection layer 120, the hole transport layer 130, and the emission layer 140, the driving voltage of the device can be lowered. In addition, by forming the hole injection layer 120, the hole transport layer 130, and the light emitting layer 140 with the same host compound, there is an advantage of reducing material cost and equipment investment cost.

Meanwhile, referring to FIGS. 1 and 3, in the organic electroluminescent device according to the second embodiment of the present invention, the hole injection layer 120, the hole transport layer 130, and the emission layer 140 are made of the above-described host compound. In more detail, the hole injection layer 120, the hole transport layer 130, and the emission layer 140 are all made of a host compound, but the hole injection layer 120 is doped with HATCN. Here, unlike the first embodiment described above, the hole transport layer 130 and the light emitting layer 140 are made of only the host compound described above without any doping. In this case, the light emitting layer 140 emits light through a singlet exciton formation mechanism in which the host compound emits light without a dopant. Therefore, the host compound of the present invention is designed to be bulky functional groups to prevent problems that may occur due to loose aggregation between molecules, thereby reducing the attraction between molecules.

As such, the organic electroluminescent device of the second embodiment of the present invention can reduce material cost and equipment investment cost because no dopant is used other than the hole injection layer 120, and the hole injection layer 120 and the hole transport layer 130 And since there is no hole injection barrier between the light emitting layers 140, there is an advantage in that the driving voltage of the device can be lowered.

Hereinafter, the characteristics of the host compound of the present invention and the organic electroluminescent device including the same will be described in detail in the following Synthesis Examples and Examples. However, the following examples are for illustrative purposes only, and the present invention is not limited to the following examples.

Synthesis example

1) 10-(2-bromo-9,9-dimethyl-9H-fluorene-7-yl)-9-phenylanthracene (10-(2-bromo-9,9-dimethyl-9H-fluoren-7- yl)-9-phenylanthracene)

2,7-dibromo-9,9-dimethyl-9H-fluorene (2,7-dibromo-9,9-dimethyl-9H-fluorene) (5.0 g, 14.20 mmol), 9- in a 250 mL two neck flask Phenyl-boronic acid (5.1 g, 17.10 mmol), sodium carbonate (Na ₂ CO ₃ ) (3.0 g, 28.40 mmol), tetrakis (triphenylphosphine) palladium (0) (Pd( PPh ₃ ) ₄ ) (1.60g, 1.40mmol) was added, dissolved in toluene/ethanol (EtOH)/water (H ₂ O), and stirred under reflux for 2 hours at 120°C. After completion of the reaction, extraction with methylenechloride and water and distillation under reduced pressure to remove the solvent, followed by column (Hex: 100%), recrystallized in methylene chloride and petroleum ether (PE ether) solvent, 3.03 g of white solid (yield 41%) Got it.

2) Preparation of 4-bromo-N,N-diphenylbenzenamine

In a 250 mL 2-neck flask, 1,4-dibromobenzene (24.9 mL, 206.83 mmol), diphenylamine (10.0 g, 59.09 mmol), tris (dibenzylideneacetone) di Palladium (0) (Pd ₂ (dba) ₃ ) (1.08g, 1.18mmol), tri-o-tolyphosphine (899mg, 2.96mmol), sodium tert- butoxide) (11.4g, 118.19mmol) was added, toluene was dissolved, and the mixture was stirred under reflux for 12 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, followed by column (Hex 100%), and the solution was distilled under reduced pressure and recrystallized in methylene chloride and petroleum ether solvent to obtain 9.26 g (yield 48%) of a white solid.

3) Preparation of 4- (diphenylamino) phenylboronic acid (4- (diphenylamino) phenylboronic acid)

Add 4-bromo-N,N-diphenylbenzeneamine (8.9g, 27.45mmol) to a 250mL 2-neck flask and dissolve in tetrahydrofuran (THF). After lowering the temperature to -78℃, n-BuLi (2.5M, 14.3mL) was slowly added dropwise. After dropwise addition, the mixture was stirred at room temperature for 1 hour. Then, after lowering the temperature to -78℃, B(OEt) ₂ (7.0mL, 41.17mmol) is slowly added dropwise. After the dropwise addition, the mixture was stirred at room temperature for 12 hours. After 12 hours, 50 mL of 5N hydrochloric acid (HCl) was added to remove tetrahydrofuran, and then worked up with ultrapure water (DI water) and methylene chloride. After distillation under reduced pressure to remove the solvent, column (MC:100%) was performed, and the solution was distilled under reduced pressure to obtain 4.75g (yield 60%) of a compound in the form of a white solid.

4) Preparation of compound FH-1

In a 250 mL 2-neck flask, 10-(2-bromo-9,9-dimethyl-9H-fluorene-7-yl)-9-phenylanthracene (10-(2-bromo-9,9-dimethyl-9H-fluoren) -7-yl)-9-phenylanthracene) (2.50g, 4.76mmol), 4-(diphenylamino)phenylboronic acid (1.65g, 5.71mmol), potassium carbonate (K ₂ CO ₃ ) (1.32 g, 9.52 mmol), tetrakis (triphenylphosphine) palladium (0) (Pd (PPh ₃ ) ₄ ) (549 mg, 0.48 mmol) was dissolved in toluene, ethanol and water, and then stirred under reflux for 12 hours. After completion of the reaction, the compound extracted with ultrapure water and methylene chloride was distilled under reduced pressure. After removal of the solvent, the column (Hex:MC = 4:1) was performed, and the solution was distilled under reduced pressure, and recrystallized in methylene chloride and petroleum ether solvents to obtain 2.64 g (yield 80%) of a solid.

5) 9,9-dimethyl-7-(10-phenylanthracen-9-yl)-9H-fluorene-2-yl-2-boronic acid (9,9-dimethyl-7-(10-phenylanthracen-9-) Preparation of yl)-9H-fluoren-2-yl-2-boronic acid)

Dissolve in 10-(2-bromo-9,9-dimethyl-9H-fluorene-7-yl)-9-phenylanthracene (2.50 g, 4.76 mmol) and tetrahydrofuran in a 250 mL two necked flask. After lowering the temperature to -78℃, n-BuLi (2.5M, 2.5mL) is slowly added dropwise. After dropwise addition, the mixture was stirred at room temperature for 1 hour. Then, after lowering the temperature to -78℃, B(OEt) ₂ (1.1mL, 6.66mmol) is slowly added dropwise. After the dropwise addition, the mixture was stirred at room temperature for 12 hours. After 12 hours, 50 mL of 5N hydrochloric acid was added to remove tetrahydrofuran, followed by work-up with ultrapure water and methylene chloride. The solvent was removed by distillation under reduced pressure, followed by column (MC:100%), and the solution was distilled under reduced pressure to obtain 1.50 g (yield: 64%) of a white solid compound.

6) 4'-bromo-2',5'-dimethyl-N,N-diphenyl-[1,1'-biphenyl]-4-amine (4'-bromo-2',5'-dimethyl- Preparation of N,N-diphenyl-[1,1'-biphenyl]-4-amine)

In a 250 mL 2-neck flask, 4-(diphenylamino)phenylboronic acid) (10.0g, 26.93mmol), 2,5-dibromo-1,4-dimethylbenzene (2, 5-dibromo-1,4-dimethylbenzene) (9.24g, 35.02mmol), potassium carbonate (K ₂ CO ₃ ) (2 M, 30 mL), tetrakis (triphenylphosphine) palladium (0) (Pd (PPh ₃ ) ₄ ) (0.13 g, 0.1 mmol) was added, dissolved in toluene and tetrahydrofuran, and stirred under reflux for 48 hours at 80°C. After completion of the reaction, distillation under reduced pressure to remove the solvent, followed by column (Hex 100%), the solution was distilled under reduced pressure and recrystallized in methylene chloride and petroleum ether solvent to obtain 6.20 g (yield 54%) of a white solid.

7) Preparation of compound FH-2

In a 250 mL 2-neck flask, 9,9-dimethyl-7-(10-phenylanthracen-9-yl)-9H-fluorene-2-yl-boronic acid (9,9-dimethyl-7-(10-phenylanthracen-9) -yl)-9H-fluoren-2-yl-2-boronic acid)(1.50g, 3.05mmol), 4'-bromo-2',5'-dimethyl-N,N-diphenyl-[1,1 '-Biphenyl]-4-amine (4'-bromo-2',5'-dimethyl-N,N-diphenyl-[1,1'-biphenyl]-4-amine) (1.30g, 3.05mmol), Potassium carbonate (K ₂ CO ₃ ) (843 mg, 6.10 mmol), tetrakis (triphenylphosphine) palladium (0) (Pd(PPh ₃ ) ₄ ) (347mg, 0.30mmol) was added and dissolved in toluene, ethanol and water. Then, the mixture was stirred under reflux for 12 hours. After completion of the reaction, the compound extracted with ultrapure water and methylene chloride was distilled under reduced pressure. After removing the solvent, the column (Hex:MC = 4:1), and the solution was distilled under reduced pressure, and recrystallized in methylene chloride and petroleum ether solvents to obtain 1.50 g (62% yield) of a white solid.

The UV absorption spectrum of the host compounds FH-1 and FH-2 of the present invention prepared in the above synthesis example and the PL spectrum at room temperature were measured and shown in FIG. 4 below, compared with the following ref host material, and summarized in Table 1 I did.

Wavelength at the highest value of the UV absorption spectrum (nm) Wavelength at peak value of PL spectrum (nm) energy
Band gap LUMO level (eV) HOMO level (eV) REF 417 421 3.00 -2.50 -5.50 FH-1 420 457 2.96 -2.60 -5.56 FH-2 414 423 3.00 -2.60 -5.60

Referring to Tables 1 and 4, it was found that the LUMO and HOMO levels of the FH-1 and FH-2 host compounds prepared in the synthesis example of the present invention were lowered.

Hereinafter, an example in which an organic electroluminescent device using the host compounds FH-1 and FH-2 of the present invention prepared in the above synthesis example is manufactured will be described.

Experiment 1: Evaluation of the organic electroluminescent device according to the structure of the first embodiment of the present invention

<Example 1>

It was washed after patterning so that the light emitting area of the ITO glass was 3 mm × 3 mm in size. After mounting the substrate in the vacuum chamber, the base pressure was 1x10 ^-7 torr, and then the host compound FH-1 was formed to a thickness of 50Å as a hole injection layer on the anode ITO, but HATCN was doped with a doping concentration of 10%. , A host compound FH-1 was formed to a thickness of 300 Å as a hole transport layer, and BD-a, a dopant, was doped to the host compound as a light emitting layer to a thickness of 400 Å, and Alq ₃ was 200 Å as an electron transport layer. The organic electroluminescent device was manufactured by forming the electron injection layer to a thickness of 10 Å, and forming Al as a cathode to a thickness of 1000 Å.

After the deposition of these layers, they were transferred from the deposition chamber into a drying box for film formation, and subsequently encapsulated using a UV curing epoxy and a moisture getter. This organic electroluminescent device has an emission area of 3 mm 2. The organic light emitting device thus obtained was connected to an external power supply source, and a DC voltage was applied. The luminescence characteristics of all the devices manufactured in the present invention were evaluated at room temperature using a constant current source (KEITHLEY) and a photometer PR 650.

<Example 2>

Under the same process conditions as in Example 1 described above, only using FH-2 instead of the host compound FH-1 was used to manufacture an organic electroluminescent device.

<Comparative Example 1>

Under the same process conditions as in Example 1, the above-described ref host material was used for the hole injection layer and the light emitting layer, and NPB was used for the hole transport layer to fabricate an organic light emitting device.

The driving voltage, current efficiency, power efficiency, quantum efficiency, luminance, and color coordinates of the organic electroluminescent devices manufactured according to Examples 1 and 2 and Comparative Example 1 were measured and shown in Table 2 below.

#
Driving voltage
(V) Current efficiency
(Cd/A) Power efficiency
(lm/W) Quantum efficiency
(%) Luminance
(Cd/㎡) Color coordinates CIE_x CIE_y Comparative Example 1 3.08 3.07 3.13 3.48 307 0.145 0.102 Example 1 3.27 3.50 3.36 3.90 350 0.143 0.111 Example 2 3.38 3.80 3.53 4.30 380 0.141 0.103

Referring to Table 2, Examples 1 and 2 of the present invention exhibit color coordinates equivalent to those of Comparative Example 1, and current efficiency, power efficiency, quantum efficiency, and luminance were improved compared to Comparative Example 1.

Experiment 2: Evaluation of the organic electroluminescent device according to the second embodiment of the present invention

<Example 3>

Under the same process conditions as in Example 1 described above, an organic light emitting diode was manufactured by omitting doping in the emission layer.

<Example 4>

Under the same process conditions as in Example 3 described above, an organic electroluminescent device was manufactured by using only FH-2 instead of the host compound FH-1.

The driving voltage, current efficiency, power efficiency, luminance and color coordinates of the organic electroluminescent device manufactured according to Examples 3 and 4 were measured, and are shown in Table 3 below.

#
Driving voltage
(V) Current efficiency
(Cd/A) Power efficiency
(lm/W) Luminance
(Cd/㎡) Color coordinates CIE_x CIE_y Example 3 3.20 2.00 1.96 200 0.153 0.130 Example 4 3.13 2.50 2.51 250 0.145 0.080

Referring to Table 3, the organic electroluminescent device manufactured according to Examples 3 and 4 of the present invention exhibits good current efficiency, power efficiency, luminance and color coordinates.

As described above, in the organic light emitting diode according to the embodiment of the present invention, since the hole injection layer, the hole transport layer, and the emission layer are made of the same host compound, there is no hole injection barrier between the hole injection layer, the hole transport layer, and the emission layer. It can lower and improve luminous efficiency. In addition, by forming a hole injection layer, a hole transport layer, and a light emitting layer with the same host compound, there is an advantage of reducing material cost and equipment investment cost.

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 interpreted 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: light emitting layer 150: electron transport layer
160: electron injection layer 170: cathode

Claims (9)

Any one host compound selected from the following compounds.

delete delete delete In the organic electroluminescent device comprising at least one organic film formed between the anode and the cathode,
The organic electroluminescent device, characterized in that the organic layer comprises the host compound of claim 1.
The method of claim 5,
The organic layer is an organic electroluminescent device, characterized in that at least one of a hole injection layer, a hole transport layer and a light emitting layer.
The method of claim 6,
The host compound is an organic electroluminescent device, characterized in that included in all of the hole injection layer, the hole transport layer and the emission layer.
The method of claim 7,
The hole injection layer further includes HATCN, and the emission layer further includes a dopant.
The method of claim 7,
The hole injection layer further comprises HATCN, and the light emitting layer is an organic electroluminescent device, characterized in that made only of the host compound.

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