KR20130004780A - Blue phophorescene compounds and organic light emitting diode devices using the same - Google Patents

Abstract

PURPOSE: A blue-phosphorous compound is provided to have excellent thermal stability while having high triplet energy and to improve blue light-emitting efficiency by facilitating energy transition in the light-emitting layer of the organic electroluminescent device. CONSTITUTION: A blue-phosphorous compound is represented by chemical formula 1. In chemical formula 1, R is one selected from a group consisting of a cyclic compound, a heterocyclic compound, and a silane-based compound and a hetero compound. The organic electroluminescent device(100) comprises a positive electrode(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 negative electrode(170). The blue phosphor compound is used as a host for the light emitting layer.

Description

Blue phosphorescent compound and organic electroluminescent device using the same {{BLUE PHOPHORESCENE COMPOUNDS AND ORGANIC LIGHT EMITTING DIODE DEVICES USING THE SAME}

The present invention relates to a blue phosphorescent compound and an organic EL device using the same, and more particularly, to an organic EL device using a high efficiency blue phosphorescent compound having a high triplet energy as a host of an emission layer of the organic EL device.

Recently, the importance of the flat panel display (FPD) has increased with the development of multimedia. In response, such as liquid crystal display (LCD), plasma display panel (PDP), field emission display (FED), organic light emitting diode device (Organic Light Emitting Diode Device) Various displays have been put into practical use.

Among these, organic light emitting diodes can be formed on flexible substrates such as plastics, and can be driven at lower voltages of 10V or less than plasma display panels or inorganic electroluminescent displays. It has the advantage of being excellent. In addition, organic electroluminescent devices can display three colors of red, green, and blue, which is a next generation display device that expresses rich colors, and has become a target of many people.

The organic light emitting device may be formed by sequentially stacking an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode. In the case of the luminescent material, excitons are formed by recombination of electrons and holes injected from both electrodes. Fluorescence in singlet excitons and phosphorescence in triplet excitons are involved. Recently, the light emitting material is changed from fluorescence to phosphorescence. This is because in the case of fluorescence, only about 25% of the singlet of excitons formed in the light emitting layer is used to make light, and 75% of the triplet is mostly lost by heat, while phosphorescent materials have a light emitting mechanism that converts all of them into light.

Briefly looking at the light emitting process of the phosphorescent device, holes injected from the anode and electrons injected from the cathode meet in the host material of the light emitting layer. Of course, the hole and the electron pair meet directly in the dopant, but in general, due to the high concentration of the host, a large amount is met in the host. At this time, the singlet excitons formed in the host is the energy transfer to the singlet or triplet of the dopant, triplet excitons are the energy transfer to the triplet of the dopant.

Once the excitons transferred to the singlet of the dopant are transferred back to the triplet of the dopant via inter system crossing, the primary destination of all excitons is the triplet level of the dopant. The exciton thus formed transitions to the ground state and generates light. At this time, when the triplet energy of the hole transport layer or the electron transport layer adjacent to the front and rear of the light emitting layer is smaller than the triplet energy of the dopant, reverse energy transfer occurs from the dopant or the host to these layers, thereby rapidly decreasing the efficiency. Therefore, the triplet energy of the hole / electron transport layer as well as the host material of the light emitting layer plays a very important role in the phosphorescent device.

For efficient energy transfer from host to dopant, the triplet energy of the host must be greater than the triplet energy of the dopant. However, in the case of CBP, which is widely used recently, since triplet energy is 2.6 eV, when the well-known Firpic phosphorescent dopant is used, the reverse energy (endothermic) transition from the host to the dopant causes the efficiency to be reduced. Therefore, there is an urgent need for the development of new phosphors with high triplet energy and excellent thermal stability.

Accordingly, an object of the present invention is to provide a high efficiency organic electroluminescent device using a novel blue phosphorescent compound as a host in the light emitting layer of the organic electroluminescent device.

In order to achieve the above object, a blue phosphorescent compound according to an embodiment of the present invention may be represented by the following formula (1).

In Formula 1, R may be any one selected from the group consisting of a cyclic compound, a heterocyclic compound, a silane compound, and a hetero compound, each independently substituted or unsubstituted.

R is any one selected from the group consisting of carbazole, alpha-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzofuran, triphenylsilane, diphenylphosphine oxide and substituents thereof Can be.

The substituent is aryl having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, akenyl having 1 to 6 carbon atoms, alkylyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkylsilyl, phenylsilyl, halogen and cyano. It may be any one selected from the group consisting of.

R may be any one of the following compounds.

The blue phosphorescent compound may be any one of the following compounds.

In addition, the blue phosphorescent compound according to an embodiment of the present invention may be represented by the following formula (2).

In Chemical Formula 2, each R may be independently selected from any one selected from the group consisting of a substituted or unsubstituted cyclic compound, heterocyclic compound, silane compound, and hetero compound.

R is any one selected from the group consisting of carbazole, alpha-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzofuran, triphenylsilane, diphenylphosphine oxide and substituents thereof Can be.

The substituent is aryl having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, akenyl having 1 to 6 carbon atoms, alkylyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkylsilyl, phenylsilyl, halogen and cyano. It may be any one selected from the group consisting of.

R may be any one of the following compounds.

The compound of Formula 2 may be any one of the following compounds.

In addition, the organic electroluminescent device according to an embodiment of the present invention is an organic electroluminescent device in which an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode are sequentially stacked, the compound described above It can be used as a host of the light emitting layer.

The emission layer may emit blue.

The compound may have a triplet energy of greater than 2.6 eV.

The blue phosphorescent compound of the present invention and the organic electroluminescent device using the same produce a novel blue phosphorescent compound having a high triplet energy, and form it as a host of the light emitting layer of the organic electroluminescent device, thereby facilitating energy transfer in the light emitting layer. There is an advantage that can improve the luminous efficiency.

1 is a view illustrating an organic electroluminescent device according to an embodiment of the present invention.
Figure 2 is a graph showing the measurement of the UV absorption spectrum and low temperature PL spectrum of the blue phosphorescent compound 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 illustrating an organic electroluminescent device according to an embodiment of the present invention.

Referring to FIG. 1, an organic light emitting display device 100 according to an exemplary embodiment of the present invention includes an anode 110, a hole injection layer 120, a hole transport layer 130, a light emitting layer 140, and an electron transport layer 150. The electron injection layer 160 and the cathode 170 may be included.

The anode 110 may be any one of an indium tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO) having a high work function as an electrode for injecting holes. 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 further include.

The hole injection layer 120 may function to smoothly inject holes from the anode 110 into the light emitting layer 140. The hole injection layer 120 may be formed of cupper phthalocyanine (CuPc), poly (3,4) -ethylenedioxythiophene (PEDOT) polyaniline and NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine), but the present invention 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 that the hole injection characteristics can be prevented from deteriorating. When the thickness of the hole injection layer 120 is too thick, the hole injection layer 120 is too thick. There is an advantage that can be prevented from increasing the driving voltage to improve.

The hole transport layer 130 plays a role of facilitating the transport of holes and may be formed by using NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine), TPD (N, N'- N, N'-bis- (phenyl) -benzidine), s-TAD, and MTDATA (4,4 ', 4 "-tris (N-3-methylphenyl-N-phenylamino) -triphenylamine) But it is not limited thereto.

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, the hole transport property can be prevented from being lowered. If the thickness is 150 nm or less, the thickness of the hole transport layer 130 is too thick, There is an advantage that the driving voltage can be prevented from rising.

The light emitting layer 140 may be formed of a material that emits red, green, and blue light, and may be formed using phosphorescent or fluorescent materials. In the present embodiment, a phosphor that emits blue will be described.

The light emitting layer 140 of the present invention is composed of a host and a dopant. More specifically, the host of the present invention consists of a blue phosphorescent compound represented by the following formula (1).

[Formula 1]

In Formula 1, each R is independently selected from any one selected from the group consisting of a substituted or unsubstituted cyclic compound, heterocyclic compound, silane compound, and hetero compound.

Here, R is carbazole, alpha-carboline, beta-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzothiophene, di Benzofuran (dibenzofuran), triphenylsilane (triphenylsilane), diphenylphosphine oxide (diphenylphosphineoxide) and any one selected from the group consisting of substituents thereof. In this case, the substituent is aryl having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, akenyl having 1 to 6 carbon atoms, alkynyl having 1 to 6 carbon atoms, and having 1 to 6 carbon atoms. It is made of any one selected from the group consisting of alkoxy, alkylsilyl, phenylsilyl, phenylsilyl, halogen and cyano.

In addition, said R consists of any one of the following compounds.

And the blue phosphorescent compound of this invention consists of either of the following compounds.

In addition, the host of the light emitting layer 140 of the present invention is made of a blue phosphorescent compound represented by the following formula (2).

[Formula 2]

In Chemical Formula 2, each R is independently selected from any one selected from the group consisting of a substituted or unsubstituted cyclic compound, heterocyclic compound, silane compound, and hetero compound.

Wherein R is any one selected from the group consisting of carbazole, alpha-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzofuran, triphenylsilane, diphenylphosphine oxide and substituents thereof Done in one. At this time, the substituent is aryl of 1 to 6 carbon atoms, alkyl of 1 to 6 carbon atoms, akenyl of 1 to 6 carbon atoms, alkylyl of 1 to 6 carbon atoms, alkoxy of 1 to 6 carbon atoms, alkylsilyl, phenylsilyl, halogen and cyan It consists of any one selected from the group consisting of furnaces.

In addition, R consists of any one of the following compounds as mentioned above.

And the blue phosphorescent compound of this invention consists of either of the following compounds.

The dopant mixed in the host of the emission layer 140 of the present invention is made of an iridium compound such as FIrppy or FIrpic. In addition, the light emitting layer 140 may include 0.1 to 50 wt% of the dopant with respect to 100 wt% of the host.

The electron transport layer 150 serves to facilitate the transport of electrons, made of one or more selected from the group consisting of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq. But it is not limited thereto.

The thickness of the electron transport layer 150 may be 1 to 50nm. In this case, when the thickness of the electron transport layer 150 is 1 nm or more, there is an advantage of preventing the electron transport characteristics from being lowered. When 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. In order to prevent the driving voltage from rising, there is an advantage.

The electron injection layer 160 serves to smooth the injection of electrons and may include Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq or SAlq.

The thickness of the electron injection layer 160 may be 1 to 50 nm. If the thickness of the electron injection layer 160 is 1 nm or more, there is an advantage that the electron injection characteristics can be prevented from being degraded. If the thickness is 50 nm or less, the thickness of the electron injection layer 150 is too thick, There is an advantage that it is possible to prevent the drive voltage from rising.

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. Here, the anode 170 may be formed to a thickness thin enough to transmit light when the organic light emitting device is a front or double-sided light emitting structure, and may reflect light when the organic light emitting device is a rear light emitting structure. It can form thick enough.

Hereinafter, the synthesis examples of the blue phosphorescent compound of the present invention and the properties of the compound will be described in detail in the following synthesis examples and examples. However, the following examples are merely to illustrate the present invention is not limited to the following examples.

Synthetic example

1) Preparation of [bis-1,3- (3-bromo-carbazole)]-benzene ([Bis-1,3- (3-Bromo-carbazole)]-benzene)

1,3-Diiodo-benzene (5.6 g, 17.04 mmol), 3-bromo-carbazole (8.8 g, 35.77 mmol), Cul (973 mg, 5.11 mmol), K ₃ PO ₄ (14.5) in a 250 mL two-neck flask g, 68.14 mmol), and trans-1,2-dicyclohexane-diamine (614 μl, 5.11 mmol) were dissolved in 200 mL of 1,4-dioxane. And refluxed for 24 hours. When the reaction is kind, the solvent is distilled under reduced pressure and short column using boiling toluene. Then, the mixture was columned using hexane: methylene chloride (6: 1), and the filtered solution was distilled under reduced pressure and recrystallized from methylene chloride / PE ether solvent to obtain 5.77 g (60%) of white powder.

2) Preparation of dibenzothiophene-3-boronic acid (dibenzothiophene-3-boronic acid)

Add 3-bromo-carbazole (8.0 g, 30.40 mmol) to a 500 mL three neck flask and dissolve in ether. After the temperature was lowered to -78 ° C, n-BuLi (2.5M, 18.2 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 3 hours. After lowering the temperature to -78 ° C, B (OEt) ₂ (51.58 mmol, 8.8 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 3 hours. After 3 hours, 50 mL of 2N hydrochloric acid was added thereto, and ether was removed to obtain a yellow solid. The yellow solid was washed several times with ultrapure water to obtain 7.2 g (100%).

3) Preparation of 9- (3-Bromo-phenyl) -9H-carbazole (9- (3-Bromo-phenyl) -9H-carbazole)

1-bromo-3-iodo-benzene (25.0 g, 88.37 mmol), carbazole (14.8 g, 88.7 mmol), Cul (1.70 g, 8.84 mmol), K ₃ PO ₄ (37.50 g) in a 500 mL two-neck flask , 176.74 mmol), and trans-1,2-dicyclohexane-diamine (1.0 mL, 8.84 mmol) were dissolved in 300 mL of 1,4-dioxane. And refluxed for 24 hours. After the reaction is completed, the solvent is distilled under reduced pressure and a short column using boiling toluene. The column was filtered using hexane, and the filtered solution was distilled under reduced pressure and recrystallized from a methylene chloride / PE ether solvent to obtain 14.0 g (49%) of a white solid.

4) Preparation of 9- (3-boronic acid-phenyl) -9H-carbazole (9- (3-boronic acid-phenyl) -9H-carbazole)

9- (3-bromo-phenyl) -9H-carbazole (5.0 g, 15.53 mmol) is added to a 500 mL three neck flask and dissolved in ether. After the temperature was lowered to -78 ° C, n-BuLi (2.5M, 7.5 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 1 hour. After lowering the temperature to -78 ° C, B (OEt) ₂ (20.19 mmol, 3.4 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 3 hours. After 3 hours, 50 mL of 2N hydrochloric acid was added thereto, the ether was removed, and a short column of methylene chloride was used to obtain 2.5 g (56%) of a white solid.

5) Preparation of (4-Bromo-phenyl) -triphenyl-silane (4-Bromo-phenyl) -triphenyl-silane)

1,4-Dibromo-benzene (9.6 g, 40.70 mmol) is added to a 500 mL three neck flask and dissolved in ether. After the temperature was lowered to -78 ° C, n-BuLi (2.5M, 18.0 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 30 minutes. After lowering the temperature to −78 ° C., triphenylchlorosilane (33.92 mmol, 10 g) is dissolved in ether and slowly added dropwise. After dropping, the mixture is stirred at room temperature for 1 hour. After the reaction was completed, the ether was removed and short columned with hexane to obtain 12.2 g (87%) of a white solid.

6) Preparation of (4-boronic acid-phenyl) -triphenyl-silane (4-boronic acid-phenyl) triphenyl-silane

(4-Bromo-phenyl) -triphenyl-silane (6.52 g, 15.70 mmol) was added to a 500 mL three neck flask and dissolved in THF. After the temperature was lowered to -78 ° C, n-BuLi (2.5M, 13.0 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 1 hour. Then, B (OEt) ₂ (31.39 mmol, 5.3 mL) was slowly added dropwise at -78 ° C. After dropping, the mixture is stirred at room temperature for 3 hours. After 3 hours, 50 mL of 2N hydrochloric acid was added thereto, and THF was removed. Then, the mixture was heated with 100% methylene chloride, and then ethyl acetate and hexane (1: 2). And recrystallized in methylene chloride / PE ether solvent to give 2.43g (39%) of a white solid.

7) Preparation of 3-boronic acid-9-phenyl-9H-carbazole (3-boronic acid-9-phenyl-9H-carbazole)

Add 3-bromo-9-phenyl-9H-carbazole (5.95 g, 18.47 mmol) to a 500 mL three neck flask and dissolve in ether. After the temperature was lowered to -78 ° C, n-BuLi (2.5M, 11.8 mL) was slowly added dropwise. After dropping, the mixture is stirred at room temperature for 1 hour. Then, B (OEt) ₂ (27.70 mmol, 4.7 mL) was slowly added dropwise at -78 ° C. After dropping, the mixture is stirred at room temperature for 3 hours. After 3 hours, 50 mL of 2N hydrochloric acid was added thereto, the ether was removed, and the mixture was columned with methylene chloride 100%.

8) Preparation of BPH-1

[Bis-1,3- (3-bromo-carbazole)]-benzene (1.5 g, 2.65 mmol), dibenzothiophene-3-boronic-acid (1.8 g, 7.95 mmol) in a 250 mL two-neck flask Add Pd (pph ₃ ) ₄ (184mg, 0.16mmol), K ₂ CO ₃ (2.2g, 15.90mmol) and dissolve in 20mL THF, 10mL toluene and 20mL ultrapure water. And refluxed for 24 hours. After the reaction was completed, the solvent was distilled under reduced pressure, separated by silica column using polarity of methylene chloride and hexane (1: 8, 1: 6, 1: 3), and the filtered solution was distilled under reduced pressure in a methylene chloride / methanol solvent. Recrystallization gave 1.2 g (58%) of white powder.

9) Preparation of BPH-2

In a 250 mL two-necked flask, [bis-1,3- (3-bromo-carbazole)]-benzene (1.5 g, 2.65 mmol), 9- (3-boronic acid-phenyl) -9H-carbazole (1.9 g, 6.62 mmol), Pd (pph ₃ ) ₄ (184mg, 0.16mmol), K ₂ CO ₃ (2.2g, 15.90mmol) was added and dissolved in 20mL THF, 10mL toluene and 20mL ultrapure water. And refluxed for 24 hours. After the reaction is completed, the solvent is distilled under reduced pressure and a short column using boiling toluene. The mixture was separated with a silica column using polarity (1: 3) of methylene chloride and hexane, and the filtered solution was distilled under reduced pressure to recrystallize in methylene chloride / PE ether solvent to obtain 1.3 g (55%) of white powder.

10) Preparation of BPH-3

In a 250 mL two-neck flask, [bis-1,3- (3-bromo-carbazole)]-benzene (1.9 g, 3.36 mmol), (4-boronic acid-phenyl) -triphenyl-silane (3.3 g, 8.39 mmol), Pd (pph ₃ ) ₄ (233mg, 0.20mmol) and K ₂ CO ₃ (2.8g, 20.13mmol) are added and dissolved in 30mL of THF, 10mL of toluene and 30mL of ultrapure water. And refluxed for 24 hours. After the reaction is completed, the solvent is distilled under reduced pressure and a short column using boiling toluene. Then, the mixture was separated by a silica column using polarity (1: 3) of methylene chloride and hexane, and the filtered solution was distilled under reduced pressure to recrystallize in methylene chloride / PE ether solvent to obtain 1.6 g (44%) of white powder.

11) Preparation of BPH-4

In a 250 mL two-neck flask [bis-1,3- (3-bromo-carbazole)]-benzene (2.8 g, 5.02 mmol), 3-boronic acid-9-phenyl-9H-carbazole (3.2 g, 11.04 mmol), Pd (pph ₃ ) ₄ (348mg, 0.30mmol), K ₂ CO ₃ (4.2g, 30.11mmol) is added and dissolved in 40mL of THF, 20mL of toluene and 40mL of ultrapure water. And refluxed for 24 hours. After the reaction is completed, the solvent is distilled under reduced pressure and a short column using boiling toluene. Then, the mixture was separated by a silica column using polarity (1: 3) of methylene chloride and hexane, and the filtered solution was distilled under reduced pressure to recrystallize in methylene chloride / PE ether solvent to obtain 1.95 g (44%) of white powder.

12) Preparation of BPH-5

In a 250 mL two-neck flask [bis-1,3- (3-bromo-carbazole)]-benzene (2.8 g, 5.02 mmol), carbazole (1.8 g, 11.04 mmol), Cul (287 mg, 1.51 mmol), Dissolve K ₂ CO ₃ (4.3 g, 20.08 mmol), trans-1,2-dicyclohexane-diamine (181 μl, 1.51 mmol) with 200 mL of 1,4-dioxane. And refluxed for 24 hours. After the reaction is completed, the solvent is distilled under reduced pressure and a short column using boiling toluene. The mixture was separated with a silica column using polarity (1: 3) of methylene chloride and hexane, and the filtered solution was distilled under reduced pressure to recrystallize in methylene chloride / PE ether solvent to obtain 3.0 g (81%) of white powder.

Example

Hereinafter, the UV absorption spectrum and the low temperature (77K) PL spectrum of the blue phosphorescent compound of the present invention represented by BPH-1 to BPH-5 prepared by the above-described synthesis method were measured and shown in FIG. Spectrum, low temperature (77K) PL spectrum, energy bandgap, HOMO level and triplet energy are shown collectively.

Wavelength at nm of UV absorption spectrum (nm) The wavelength (nm) at the highest value of the PL spectrum Energy bandgap HOMO level (eV) Triplet Energy (eV) BPH-1 301, 363 454 3.41 5.70 2.73 BPH-2 343, 364 445 3.41 5.98 2.79 BPH-3 301, 362 454 3.43 5.96 2.73 BPH-4 305, 366 450 3.39 5.61 2.76 BPH-5 343, 370 412 3.35 5.91 3.01

Referring to Table 1 and Figure 1, it can be seen that the BPH-1 to BPH-5 compound prepared according to an embodiment of the present invention is higher than the triplet energy 2.6eV of the conventionally known CBP.

As described above, according to the present invention, a novel blue phosphorescent compound having a high triplet energy is prepared and formed as a host of the light emitting layer of the organic light emitting device, thereby facilitating energy transfer in the light emitting layer, thereby improving blue light emission efficiency. There is an advantage to that.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (13)

A blue phosphorescent compound represented by the following formula (1).
[Formula 1]

In Chemical Formula 1,
R is a blue phosphorescent compound, each independently selected from the group consisting of a substituted or unsubstituted cyclic compound, heterocyclic compound, silane compound and hetero compound.
The method according to claim 1,
R is any one selected from the group consisting of carbazole, alpha-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzofuran, triphenylsilane, diphenylphosphine oxide and substituents thereof Phosphorus blue phosphorescent compound.
The method of claim 2,
The substituent is aryl having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, akenyl having 1 to 6 carbon atoms, alkylyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkylsilyl, phenylsilyl, halogen and cyano. Blue phosphorescent compound which is any one selected from the group consisting of.
The method of claim 3,
R is a blue phosphorescent compound of any one of the following compounds.

The method according to claim 1,
The blue phosphorescent compound is any one of the following compounds.

A blue phosphorescent compound represented by the following formula (2).
(2)

In Formula 2,
R is a blue phosphorescent compound, each independently selected from the group consisting of a substituted or unsubstituted cyclic compound, heterocyclic compound, silane compound and hetero compound.
The method of claim 6,
R is any one selected from the group consisting of carbazole, alpha-carboline, beta-carboline, gamma-carboline, dibenzothiophene, dibenzofuran, triphenylsilane, diphenylphosphine oxide and substituents thereof Phosphorus blue phosphorescent compound.
The method of claim 7, wherein
The substituent is aryl having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, akenyl having 1 to 6 carbon atoms, alkylyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkylsilyl, phenylsilyl, halogen and cyano. Blue phosphorescent compound which is any one selected from the group consisting of.
The method of claim 7, wherein
R is a blue phosphorescent compound of any one of the following compounds.

The method of claim 6,
The compound of Formula 2 is any one of the following compounds blue phosphorescent compound.

In an organic light emitting device in which an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode are laminated in this order,
An organic light emitting device using the compound of any one of claims 1 to 10 as a host of the light emitting layer.
12. The method of claim 11,
The light emitting layer is an organic light emitting device emitting blue light.
12. The method of claim 11,
The compound has an triplet energy of more than 2.6 eV organic light emitting device.

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