CN109004102B - application of a compound - Google Patents

Abstract

The present invention provides an application of a compound. The compound represented by the formula (I) provided by the present invention can effectively improve the light extraction efficiency of the device after preparing an organic electroluminescence device as a CPL layer.

Description

application of a compound

technical field

The invention relates to the technical field of organic optoelectronic materials, in particular to the application of a compound.

Background technique

The related research on organic electroluminescent devices started in the 1860s, and it was not until the late 1980s that OLEDs flourished. OLED has the advantages of all-solid-state, low-voltage drive, active light-emitting, fast response, wide viewing angle, large light-emitting area, light-emitting wavelength covering the entire visible light region, and rich colors. Flat panel display device in the foreground. The luminescence brightness of organic electroluminescence devices is proportional to the product of the concentration of holes and electrons and the recombination probability of excitons. To obtain high luminous efficiency, not only holes and electrons are required to be effectively injected, transported and recombined, but also empty spaces are required. Hole and electron injection reach equilibrium. Therefore, in organic electroluminescence devices, the energy band matching between the organic layers and between the organic layers and the two electrodes is very important for the recombination emission of the device.

In order to optimize and balance the performance of the device, a variety of functional layers with different roles have been introduced, such as hole injection layers, hole blocking layers, and so on. The effect of adding a hole injection layer between the ITO anode and the hole transport layer is mainly manifested in reducing the interface barrier, increasing the adhesion between the hole transport layer and the ITO electrode, improving its stability, and balancing electron and hole injection. .

In addition, due to the huge gap between the external quantum efficiency and the internal quantum efficiency of OLEDs, the development of OLEDs is greatly restricted. Therefore, how to improve the light extraction efficiency of OLEDs has also become a research hotspot. Total reflection occurs at the interface between the ITO film and the glass substrate and at the interface between the glass substrate and the air. The light emitted to the front of the OLED device to the external space accounts for about 20% of the total amount of the organic material film EL, and the remaining about 80% of the light It is mainly limited to organic material films, ITO films and glass substrates in the form of guided waves, which seriously restricts the development and application of OLEDs. , and then improve the performance of the device has attracted widespread attention.

SUMMARY OF THE INVENTION

In view of this, the technical problem to be solved by the present invention is to provide an application of a compound, which can improve the efficiency of the device as a CPL layer material in an OLED device.

The invention provides the application of a compound represented by formula (I) as a CPL layer in preparing an organic electroluminescence device,

Wherein, the Ar ₁ and Ar ₂ are independently selected from hydrogen, C1-C8 alkyl, C6-C25 aryl or C2-C20 heteroaryl;

The A is formula (A-1), formula (A-2) or formula (A-3),

The R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , and R ₆ are independently selected from hydrogen, C1-C3 alkyl or C6-C10 aryl,

Or the R ₁ and R ₂ and the carbon where they are located form a C10-C20 fused ring group.

Preferably, the Ar ₁ is selected from hydrogen, a C1-C5 alkyl group, a phenyl group, a C1-C5 alkyl-substituted phenyl group, a C10-20 fused-ring aryl group, or a C3-C15 nitrogen-containing heteroaryl group.

Preferably, the Ar ₂ is selected from hydrogen, C1-C5 alkyl, phenyl, C1-C5 alkyl-substituted phenyl, C10-20 fused-ring aryl or C3-C15 nitrogen-containing heteroaryl .

/4. The application according to claim 1, wherein the Ar ₁ is selected from hydrogen, methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, trifluoromethyl, benzene base, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl , 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3,5-dimethylphenyl , pyridyl, pyridazinyl, pyrazinyl, triazinyl or acridinyl.

Preferably, the Ar ₂ is selected from hydrogen, methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, trifluoromethyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3- tert-Butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoro Methylphenyl, 4-n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3,5-dimethylphenyl, pyridyl, pyridazinyl, pyrazinyl, tris oxazinyl or acridinyl.

Preferably, the R ₁ and R ₂ are independently selected from hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-Trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4 - n-propylphenyl, 4-isopropylphenyl or 4-methylphenyl;

Alternatively, the R ₁ and R ₂ form a fluorenyl group with the carbon on which they are located.

Preferably, the R ₃ , R ₄ , R ₅ , and R ₆ are independently selected from hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3- tert-Butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoro Methylphenyl, 4-n-propylphenyl, 4-isopropylphenyl or 4-methylphenyl.

Preferably, the compound represented by the formula (I) is the formula (I-1), the formula (I-2), the formula (I-3), the formula (I-4), the formula (I-5) or the formula (I-6),

Wherein, the Ar ₁ and Ar ₂ are independently selected from hydrogen, a C1-C8 alkyl group, a C6-C25 aryl group, or a C2-C20 heteroaryl group.

Preferably, the compound represented by the formula (I) is the formula (001) to the formula (159),

Compared with the prior art, the present invention provides an application of a compound represented by formula (I) as a CPL layer in preparing an organic electroluminescent device. The experimental results show that the compound provided by the present invention is used as a CPL of an OLED device. After the layer (Caplayer, light extraction cover layer) material is used, the light extraction efficiency of the device can be effectively improved.

Detailed ways

The invention provides the application of a compound represented by formula (I) as a CPL layer in preparing an organic electroluminescence device,

Wherein, the Ar ₁ and Ar ₂ are independently selected from hydrogen, C1-C8 alkyl, C6-C25 aryl or C2-C20 heteroaryl;

The A is formula (A-1), formula (A-2) or formula (A-3),

The R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , and R ₆ are independently selected from hydrogen, C1-C3 alkyl or C6-C10 aryl,

Or the R ₁ and R ₂ and the carbon where they are located form a C10-C20 fused ring group.

According to the present invention, the Ar ₁ is selected from hydrogen, a C1-C5 alkyl group, a phenyl group, a C1-C5 alkyl group substituted phenyl group, a C10-20 fused-ring aryl group or a C3-C15 nitrogen-containing heteroaryl group , more preferably hydrogen, methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, trifluoromethyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl , 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3,5-dimethylphenyl, pyridyl, pyridazinyl, pyrazinyl, triazinyl or acridine said Ar ₂ is selected from hydrogen, C1-C5 alkyl, phenyl, C1-C5 alkyl-substituted phenyl, C10-20 fused-ring aryl or C3-C15 nitrogen-containing heteroaryl, more Preferably hydrogen, methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, trifluoromethyl, phenyl, anthracenyl, naphthyl, phenanthrenyl, 3-tert-butylphenyl, 3 -Trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4- n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3,5-dimethylphenyl, pyridyl, pyridazinyl, pyrazinyl, triazinyl or acridinyl.

The R ₁ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl , 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4 -isopropylphenyl or 4-methylphenyl; the R ₂ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3- tert-Butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoro methylphenyl, 4-n-propylphenyl, 4-isopropylphenyl or 4-methylphenyl; or the R ₁ and R ₂ form a fluorenyl group with the carbon on which they are located.

The R ₃ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl , 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4 - isopropylphenyl or 4-methylphenyl.

The R ₄ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl , 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4 - isopropylphenyl or 4-methylphenyl.

The R ₅ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl , 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4 - isopropylphenyl or 4-methylphenyl.

The R ₆ is preferably hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl , 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4 - isopropylphenyl or 4-methylphenyl.

Specifically, the compound represented by the formula (I) is the formula (I-1), the formula (I-2), the formula (I-3), the formula (I-4), the formula (I-5) or the formula (I-6),

Wherein, the Ar ₁ and Ar ₂ are independently selected from hydrogen, a C1-C8 alkyl group, a C6-C25 aryl group, or a C2-C20 heteroaryl group.

More specifically, the compound represented by the formula (I) is the formula (001) to the formula (159),

The application of a compound of formula (I) provided by the present invention as a CPL layer in the preparation of an organic electroluminescent device, by selecting a specific compound provided by the present invention as the CPL layer (Cap layer, light extraction) of the OLED device After the cover layer) material is used, the light extraction efficiency of the device can be effectively improved. And the source of raw materials is wide, and it has broad prospects for industrial application.

代表基团的连接键；

中-N代表该键可以在芳基的任意一个位置。In addition, in the present invention

Represents the connecting bond of the group;

Where -N represents that the bond can be at any position of the aryl group.

The following will clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

The compound of formula (I) of the present invention is used as a CPL layer in the preparation of an OLED device, wherein the present invention has no special requirements for the source of the compound of formula (I), which can be purchased or homemade. Prepared by conventional technical means.

The OLED device in this embodiment is a top emission organic electroluminescence device. The structure includes: a substrate 1, and a reflective layer 2, an anode 3, a hole injection layer (HIL) 4, a hole transport layer, and a reflective layer 2, an anode 3, a hole injection layer (HIL) 4, and a hole transport layer that are sequentially plated on the substrate 1 layer (HTL) 5 , light emitting layer (EML) 6 , electron transport layer (ETL) 7 , electron injection layer (EIL) 8 , cathode 9 and capping layer 10 .

Wherein, the substrate 1 is a glass substrate, a quartz substrate or a flexible polymer substrate (plastic or polyimide, etc.);

The reflection layer 2 can be metal silver or silver alloy, metal aluminum or aluminum alloy layer, which is used to reflect the light in the direction of the incident substrate;

The anode layer 3 can be organic semiconductor materials such as ITO (indium tin oxide), IZO (indium zinc oxide), high work function metal or alloy, C60, etc.; all can achieve the purpose of the present invention and belong to the protection scope of the present invention.

The hole injection layer 4 is selected from 4,4',4"-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (MTDATA) and 2,3,5,6-tetrafluorotetracyano The mixture of quinodimethane (F4TCNQ), the mass ratio of the two is 25:1.

The hole transport layer 5 is N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB).

The light emitting layer 6 may be red, green or blue. Among them, the host RH of red light is Bebq2 (bis(10-hydroxybenzo[h]quinoline) beryllium), the doping RD is Ir(piq)2(acac), and the host GH of green light is CBP(4,4 '-bis(N-carbazole)-1,1'-biphenyl), doped GD is Ir(ppy)3, blue host BH is ADN, doped BD is DPAVB (1,4-bis[4-( dimethylaminophenyl)styryl]benzene),

The electron transport layer 7 is Bphen. The electron injection layer 8 may be an inorganic alkali metal compound or an organic alkali metal complex. Preferably, the alkali metal is an inorganic alkali metal compound which is LiF, and the organic alkali metal complex is lithium octaquinolate.

The specific preparation devices are as follows:

Blu-ray device

The substrate 1 is a glass substrate, Ag is sputtered on the substrate 1 as a reflective layer 2 with a thickness of 150 nm, ITO of 10 nm is sputtered as the anode 3 of the device, and the desired pattern is etched, and treated with O plasma for ₃ minutes. The resulting substrate 1 was placed in a vacuum, and 130 nm of a mixture of MTDATA and F4TCNQ was deposited by co-evaporation as a hole injection layer (HIL) 4, where the weight of F4TCNQ was ₄ % by weight of MTDATA. Next, 10 nm of NPB was deposited as a hole transport layer (HTL) 5 . A 30 nm mixture of ADN and DPAVB was then co-evaporated to serve as the light-emitting layer 6, wherein the molar ratio of DPAVB to ADN was 1:20. Then 20 nm of Bphen was deposited as electron transport layer (ETL) 7 . Further, LiF was vapor-deposited to a thickness of 1 nm as the electron injection layer 8 . Cathode 9 is a 10nm alloy layer of K and Ag co-evaporated, wherein K is evaporated by KBH ₄ decomposing during the evaporation process (temperature 400 ° C), K and Ag molar ratio is 8:1, and then 25nm Ag is deposited . The compound 001 of the present invention was vapor-deposited at 30 nm as a CPL layer.

Green light device

Consistent with the preparation method of the blue light device, only the thickness of HIL was changed to 170 nm, and the material of the light-emitting layer was changed to a mixture of CBP and Ir(ppy)3, wherein the molar ratio of Ir(ppy)3 to CBP was 1:10.

red light device

Consistent with the preparation method of the blue light device, except that the thickness of HIL was changed to 60 nm, and the material of the light-emitting layer was changed to a mixture of BeBq ₂ and Ir(piq) ₂ (acac), in which Ir(piq) ₂ (acac) and BeBq ₂ were mixed. The molar ratio was 1:10.

Example 2

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: K and Ag alloy layer, the molar ratio is 2:1, and the thickness is 7 nm; the Ag layer is 25 nm; the CPL layer is the compound 037 of the present invention, the thickness is 50 nm, Preparation of red light devices.

Example 3

The specific implementation steps are the same as in Example 1, except that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 5 nm; the Ag layer is 20 nm; the CPL layer is the compound 061 of the present invention, and the thickness is 60 nm, Preparation of green light devices.

Example 4

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 6:1, and the thickness is 7 nm; the Ag layer is 25 nm; the CPL layer is the compound 085 of the present invention, the thickness is 30 nm, Preparation of red light devices.

Example 5

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Li and Ag alloy layer, the molar ratio is 8:1, and the thickness is 9 nm; the Ag layer is 30 nm; the CPL layer is the compound 109 of the present invention, the thickness is 50 nm, Preparation of green light devices.

Example 6

The specific implementation steps are the same as in Example 1, except that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 11 nm; the Ag layer is 20 nm; the CPL layer is the compound 139 of the present invention, and the thickness is 45 nm, Preparation of blue light devices.

Example 7

The specific implementation steps are the same as those in Example 1, except that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 11 nm; the Ag layer is 20 nm; the CPL layer is the compound 013 of the present invention, the thickness is 45 nm, Preparation of blue light devices.

Example 8

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 3 nm; the Ag layer is 15 nm; the CPL layer is the compound 050 of the present invention, the thickness is 100 nm, Fabrication of blue light devices.

Example 9

The specific implementation steps are the same as those in Example 1, except that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 3 nm; the Ag layer is 15 nm; the CPL layer is the compound 059 of the present invention, the thickness is 100 nm, Preparation of blue light devices.

Example 10

The specific implementation steps are the same as in Example 1, except that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 6:1, and the thickness is 7 nm; the Ag layer is 25 nm; the CPL layer is the compound 002 of the present invention, and the thickness is 30 nm, Preparation of red light devices.

Example 11

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 6:1, and the thickness is 7 nm; the Ag layer is 25 nm; the CPL layer is the compound 003 of the present invention, the thickness is 30 nm, Preparation of red light devices.

Example 12

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 6:1, and the thickness is 7 nm; the Ag layer is 25 nm; the CPL layer is the compound 004 of the present invention, and the thickness is 30 nm, Preparation of red light devices.

Example 13 to Example 16

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Li and Ag alloy layer, the molar ratio is 8:1, and the thickness is 9 nm; the Ag layer is 30 nm; 50 nm to prepare green light devices.

Example 17 to Example 20

The specific implementation steps are the same as those in Example 1, the only difference is that the cathode 9 is: Mg and Ag alloy layer, the molar ratio is 4:1, and the thickness is 3 nm; the Ag layer is 15 nm; 100 nm to prepare blue light devices.

Comparative Example 1

This comparative example is an example of preparing an OLED device. The specific steps are as described in Example 1. The only difference is that the OLED transparent composite cathode 9 only includes an alloy layer and an Ag layer of low work function metal and Ag, which are arranged in sequence, and does not include CPL layer, red light device, green light device and blue light device are prepared.

Comparative Example 2

In this comparative example, the preparation steps of the OLED device are the same as those in Example 1, except that the cathode 9 is an OLED composite cathode structure, and the OLED composite cathode structure includes an alloy layer of low work function metal and Ag and an Ag layer arranged in sequence. . The specific steps are as follows: under vacuum conditions, use thermal evaporation technology to evaporate Mg/Ag alloy material as the alloy layer, the molar ratio of Mg/Ag is 1:1, and the thickness of the alloy layer is 10nm; Under the conditions, using thermal evaporation technology, an Ag layer with a thickness of 10 nm is evaporated on the alloy layer to prepare red light devices, green light devices and blue light devices.

Example 21

The properties of the OLED devices obtained in Examples 2-8 and Comparative Examples 1-2 were tested, and the results are shown in Table 1.

Table 1

It can be seen from the above table that for the same type of device, the device provided by the present invention has better current efficiency and brightness life than the device in the comparative example.

The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. The use of a compound of formula (I) as a CPL layer in the preparation of an organic electroluminescent device,

wherein, Ar is₁、Ar₂Independently selected from hydrogen, C1-C5 alkyl, phenyl, C1-C5 alkyl substituted phenyl, C10-20 condensed ring aryl or C3-C15 nitrogen-containing heteroaryl;

a is a formula (A-1), a formula (A-2) or a formula (A-3),

the R is₁、R₂、R₃、R₄、R₅、R₆Independently selected from hydrogen, C1-C3 alkyl or C6-C10 aryl,

or said R is₁And R₂Forms a C10-C20 condensed ring group with the carbon on which the compound is arranged.

2. Use according to claim 1, wherein said Ar is₁Is selected fromHydrogen, methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl, trifluoromethyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3, 5-dimethylphenyl, pyridyl, pyridazinyl, pyrazinyl, triazinyl or acridinyl.

3. Use according to claim 1, wherein said Ar is₂Selected from the group consisting of hydrogen, methyl, ethyl, propyl, n-butyl, t-butyl, pentyl, trifluoromethyl, phenyl, anthracenyl, naphthyl, phenanthryl, 3-t-butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-t-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl, 4-methylphenyl, 3, 5-dimethylphenyl, pyridyl, pyridazinyl, pyrazinyl, triazinyl or acridinyl.

4. Use according to claim 1, wherein R is₁、R₂Independently selected from hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthryl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl or 4-methylphenyl;

or said R is₁And R₂Form a fluorenyl group with the carbon on which it is located.

5. Use according to claim 1, wherein R is₃、R₄、R₅、R₆Independently selected from hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, anthryl, naphthyl, phenanthryl, 3-tert-butylphenyl, 3-trifluoromethylphenyl, 3-n-propylphenyl, 3-isopropylphenyl, 3-methylphenyl, 4-tert-butylphenyl, 4-trifluoromethylphenyl, 4-n-propylphenyl, 4-isopropylphenyl or4-methylphenyl radical.

6. The use according to claim 1, wherein the compound of formula (I) is of formula (I-1), formula (I-2), formula (I-3), formula (I-4), formula (I-5) or formula (I-6),

wherein, Ar is₁、Ar₂Independently selected from hydrogen, alkyl of C1-C8, aryl of C6-C25 or heteroaryl of C2-C20.

7. The use according to claim 1, wherein the compound of formula (I) is of formula (001), formula (002), formula (003), formula (004), formula (005), formula (006), formula (007), formula (008), formula (009), formula (010), formula (011), formula (012), formula (013), formula (014), formula (015), formula (016), formula (017), formula (018), formula (019), formula (020), formula (021), formula (022), formula (023), formula (024), formula (025), formula (026), formula (027), formula (028), formula (029), formula (030), formula (031), formula (032), formula (033), formula (034), formula (035), formula (036), formula (037), formula (038), formula (039), formula (041), formula (042), formula (043), formula (044), formula (045), Formula (046), formula (047), formula (048), formula (049), formula (050), formula (051), formula (052), formula (053), formula (054), formula (055), formula (056), formula (037), formula (058), formula (059), formula (060), formula (061), formula (062), formula (033), formula (064), formula (065), formula (066), formula (067), formula (038), formula (069), formula (070), formula (071), formula (072), formula (073), formula (074), formula (075), formula (076), formula (077), formula (078), formula (079), formula (080), formula (081), formula (082), formula (083), formula (084), formula (085), formula (086), formula (087), formula (088), formula (089), formula (085), formula (092), formula (095), formula (093), formula (094), formula (095), formula (094), formula (086), formula (097), formula (094), formula (09, Formula (098), formula (099), formula (100), formula (101), formula (102), formula (103), formula (104), formula (105), formula (106), formula (107), formula (108), formula (109), formula (111), formula (112), formula (113), formula (114), formula (115), formula (116), formula (117), formula (118), formula (119), formula (121), formula (122), formula (123), formula (124), formula (125), formula (126), formula (127), formula (128), formula (129), formula (131), formula (132), formula (133), formula (134), formula (135), formula (136), formula (137), formula (138), formula (139), formula (141), formula (142), formula (143), formula (144), formula (145), formula (146), formula (147), formula (148), formula (149), or a mixture thereof, Formula (151), formula (152), formula (153), formula (154), formula (155), formula (156), formula (137), formula (158), or formula (159),