Platinum complex, preparation method and application thereof, and organic photoelectric device

Abstract

The invention relates to the technical field of electric materials and devices, and discloses a platinum complex, a preparation method and application thereof and an organic photoelectric device. The platinum complex has a structure as shown in a formula (I), and R0 is selected from one or more of substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl and substituted or unsubstituted C6-C30 aryl; r1-R15 are the same or different and are respectively and independently selected from one or more of hydrogen atoms and isotope atoms thereof, halogen, substituted or unsubstituted C1-C30 alkyl groups, substituted or unsubstituted C3-C30 cycloalkyl groups, substituted or unsubstituted C6-C30 aryl groups and substituted or unsubstituted C3-C30 cycloalkenyl groups; the platinum complex is high in luminous efficiency and very stable in spectrum; # imgabs0 #

Description

Technical Field

[0001] The present invention relates to the technical field of electrical materials and devices, and in particular, to a platinum complex, a preparation method and an application thereof, and an organic optoelectronic device. Background Art

[0002] Organic electroluminescence refers to a luminescence process in which organic materials convert electrical energy into light energy after being excited by current and electric field.

[0003] Compared with inorganic luminescent materials, organic luminescent materials can better meet the requirements for light adaptability. Displays and light emitters manufactured based on organic light-emitting diode (OLED) technology have a flexible shape and incorporate many artistic elements into electronic devices. The earliest organic electroluminescent devices used aromatic amine organic small molecules as the hole transport layer and aluminum 8-hydroxyquinoline as the light-emitting layer. Such devices with organic molecules as the core light-emitting material are called organic light-emitting diodes (OLEDs), which can be applied to the fields of new displays and lighting, and have many advantages and potentials. The light-emitting devices prepared from organic materials have the advantages of high quantum efficiency, high brightness, high luminous efficiency, etc.; the light-emitting devices prepared from organic luminescent materials have the advantages of being light, thin, and flexible in shape, and in particular, the ability to be prepared into flexible devices is an advantage that cannot be compared with other luminescent materials. According to the classification of the core electroluminescent materials, traditional OLEDs can be divided into fluorescent OLEDs and phosphorescent OLEDs. Compared with fluorescent OLEDs (the theoretical luminous efficiency is at most 25%), phosphorescent OLEDs (the theoretical luminous efficiency is 100%) have become the mainstream direction of the research and development of OLED technology due to their higher luminous efficiency.

[0004] Currently, blue-green phosphorescent materials are mainly applied to lighting displays and blue-green lights, such as TV backplane technology, automotive turn signals, etc. In terms of luminescence, blue-green is a "combined" color. It is not one of the "RGB" primary colors. It is a light color composed of equal amounts of red light and green light. Therefore, in color science, blue-green is formed by filtering yellow light from white light and is often the complementary auxiliary light color of yellow light. Blue-green is also a basic natural color in common sense cognition. Its luminescence application can be used for the atmosphere of this color, etc., and can also be used to improve the color gamut range required by full-color displays. Moreover, they also greatly contribute to the realization of high-performance multi-color (red, green, blue + blue-green + yellow) white light diodes. Organic light-emitting diode materials have the characteristic that their colors can be regulated. With the development of technology in this field, the manufacturing cost will inevitably decrease. This organic light-emitting diode material and device technology that can emit monochromatic blue-green light through a simple structure will show advantages. Although blue-green has a high-level aesthetic sense in terms of perception, the development of blue-green phosphorescent materials has not been taken seriously, and there are few materials and devices specifically for this color, which greatly limits the requirements for future application development.

[0005] Therefore, the development of blue-green phosphorescent materials with high efficiency, wide spectrum, stability, and long working life has practical application value in luminescence applications. SUMMARY OF THE INVENTION

[0006] The object of the present invention is to overcome the defects of existing blue-green phosphorescent materials in luminescence applications, such as low efficiency, narrow spectrum, instability, and short working life. A platinum complex, its preparation method and application, and an organic optoelectronic device are provided. The platinum complex of the present invention contains pyrazole, dibenzofuran, phenyl ether, and phenylimidazole (carbene coordination) structures, and can emit blue-green light between 490-500 nm in a single molecule, with high luminescence efficiency and very stable spectrum.

[0007] To achieve the above object, in the first aspect of the present invention, a platinum complex is provided, wherein the platinum complex has the structure shown in formula (I):

[0008]

[0009] Wherein, R0 is selected from one or more of substituted or unsubstituted C1-C 30 alkyl, substituted or unsubstituted C3-C 30 cycloalkyl, and substituted or unsubstituted C6-C 30 aryl;

[0010] And / or, R1-R 15 are the same or different, and each independently selected from a hydrogen atom and its isotope atoms, a halogen, substituted or unsubstituted C1-C 30 alkyl, substituted or unsubstituted C3-C 30 cycloalkyl, substituted or unsubstituted C6-C 30 aryl, and substituted or unsubstituted C3-C 30 cycloalkenyl;

[0011] Wherein, the hydrogen atoms in the alkyl, cycloalkyl, aryl, or cycloalkenyl include their isotope atoms.

[0012] According to the present invention, in the second aspect of the present invention, a preparation method of a platinum complex is provided, wherein the preparation method includes:

[0013] (1) Coupling the compound A shown in formula (a), the compound F1 shown in formula (b), and the compound F2 shown in formula (c) to obtain the intermediate C shown in formula (d);

[0014]

[0015] R0-NH2, formula (c);

[0016]

[0017] Wherein, X1 and X2 are the same or different, each being H or a halogen, and not both being H at the same time;

[0018] (2) The intermediate C shown in formula (d) is subjected to an imidazole cyclization reaction with the compound F3 shown in formula (e) to obtain the ligand precursor D shown in formula (f);

[0019] NH4 + Y - (EtO)3CH, formula (e);

[0020]

[0021] Wherein, Y- is an anion;

[0022] (3) The ligand precursor D shown in formula (f) is subjected to a cyclometalation reaction with a platinum salt to obtain the platinum complex shown in formula (I);

[0023]

[0024] Wherein, in formulas (a), (b), (c), (d), (e), (f) and (I), R0, R1 - R 15 are the same as the aforementioned definitions.

[0025] The third aspect of the present invention provides a platinum complex prepared by the aforementioned preparation method.

[0026] The fourth aspect of the present invention provides an application of the aforementioned platinum complex in an organic optoelectronic device.

[0027] According to the fifth aspect of the present invention, there is provided an application of the aforementioned platinum complex in a display device and / or a lighting device.

[0028] The sixth aspect of the present invention provides an organic optoelectronic device, wherein the organic optoelectronic device includes a positive electrode, a negative electrode, and an organic layer disposed between the positive electrode and the negative electrode, the organic layer includes a light-emitting layer, and the light-emitting layer includes the aforementioned platinum complex.

[0029] Through the above technical solutions, by using the platinum complex provided by the present invention, the platinum complex contains pyrazole, dibenzofuran and phenyl ether, phenylimidazole (carbene coordination) structures, emits blue-green light between 490 - 500 nm in a single molecule, has high luminous efficiency, a very stable spectrum, and is little affected by the environment; it can simultaneously realize the applications of blue-green color photoluminescence and electroluminescence. Description of the Drawings

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Photoluminescence spectra of complex 2 prepared in Example 1 of the present invention in solution and thin film;

[0032] Figure 2 Photoluminescence spectra of complex 7 prepared in Example 2 of the present invention in solution and thin film;

[0033] Figure 3 Photoluminescence spectra of complex 8 prepared in Example 3 of the present invention in solution and thin film;

[0034] Figure 4 Ultraviolet-visible absorption spectrum of complex 2 prepared in Example 1 of the present invention;

[0035] Figure 5 For complex 2 prepared in Example 1 of the present invention 1 1H NMR spectrum;

[0036] Figure 6 For complex 7 prepared in Example 2 of the present invention 1 1H NMR spectrum;

[0037] Figure 7 For complex 8 prepared in Example 3 of the present invention 1 1H NMR spectrum;

[0038] Figure 8 Mass spectrum of complex 2 prepared in Example 1 of the present invention;

[0039] Figure 9 Mass spectrum of complex 7 prepared in Example 2 of the present invention;

[0040] Figure 10 Mass spectrum of complex 8 prepared in Example 3 of the present invention;

[0041] Figure 11 Cross-sectional view of the OLED device of the present invention;

[0042] Figure 12 Electroluminescence spectrum of the organic photovoltaic device of complex 2 prepared in Example 1 of the present invention;

[0043] Figure 13 Device lifetime diagram of complex 2 prepared in Example 1 of the present invention;

[0044] Figure 14 CIE diagram of the luminescence of the device prepared from Complex 2 in Example 1 of the present invention and the device prepared from Complex 7 in Example 2.

[0045] Description of reference numerals:

[0046] 1 - Anode layer, 2 - Hole injection layer, 3 - Hole transport layer, 4 - Light-emitting layer, 5 - Electron transport layer, 6 - Cathode layer. Detailed implementation manners

[0047] The endpoints and any values disclosed in this text are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this text.

[0048] As described above, the first aspect of the present invention provides a platinum complex, wherein the platinum complex has the structure shown in formula (I):

[0049]

[0050] Wherein, R0 is selected from one or more of substituted or unsubstituted C1-C 30 alkyl, substituted or unsubstituted C3-C 30 cycloalkyl, and substituted or unsubstituted C6-C 30 aryl;

[0051] And / or, R1-R 15 are the same or different and each independently selected from a hydrogen atom and its isotope atoms, a halogen, substituted or unsubstituted C1-C 30 alkyl, substituted or unsubstituted C3-C 30 cycloalkyl, substituted or unsubstituted C6-C 30 aryl, and substituted or unsubstituted C3-C 30 cycloalkenyl;

[0052] Wherein, the hydrogen atoms in the alkyl, cycloalkyl, aryl or cycloalkenyl include their isotope atoms.

[0053] In the present invention, it should be noted that R1-R 15 refers to R1 to R 15 , that is, R1-R 15 [[ID=�4]]refers to R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 , R11, R12 , R 13 , R 14 , R 15 .

[0054] The inventors of the present invention have found that by introducing pyrazole, dibenzofuran, phenyl ether, and phenylimidazole (carbene coordination) into the ligand of the platinum complex, blue-green light emission between 490 - 500 nm can be achieved in a single molecule, with high luminous efficiency, a very stable spectrum, and little influence from the environment; and the applications of blue-green color photoluminescence and electroluminescence can be realized simultaneously.

[0055] According to the present invention, R0 is independently selected from one or more of the deuterated groups -CDH2, -CD2H, -CD3, -CDR b R c , -CD2R d , wherein R b , R c and R d are the same or different and are each independently selected from substituted or unsubstituted C1 - C 29 alkyl, substituted or unsubstituted C6 - C 29 aryl, substituted or unsubstituted C3 - C 29 cycloalkyl, and substituted or unsubstituted C3 - C 29 cycloalkenyl.

[0056] According to the present invention, R1 - R 15 are the same or different and are each independently selected from deuterium, -CDH2, -CD2H, -CD3, -CDR b R c , -CD2R d , wherein R b , R c and R d are the same or different and are each independently selected from substituted or unsubstituted C1 - C 29 alkyl, substituted or unsubstituted C6 - C 29 aryl, substituted or unsubstituted C3 - C 29 cycloalkyl, and substituted or unsubstituted C3 - C 29 cycloalkenyl.

[0057] According to the present invention, the substituted C1 - C 29 alkyl is a C1 - C 29 silyl group.

[0058] According to the present invention, the substituted C6 - C 29 aryl is a C6 - C 29 heteroaryl.

[0059] According to the present invention, preferably, the halogen is selected from one or more of fluorine, chlorine, and bromine, and preferably bromine.

[0060] According to the present invention, preferably, the isotope atom is a deuterium atom and / or a tritium atom.

[0061] According to the present invention, preferably, the alkyl group is a C1-C 24 alkyl group, and preferably, the alkyl group is selected from one or more of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.

[0062] According to the present invention, preferably, the aryl group is selected from one or more of phenyl, naphthyl, and biphenyl.

[0063] According to the present invention, preferably, the cycloalkyl group is selected from one or more of cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.

[0064] According to the present invention, preferably, R0 and R1-R 15Same or different, each independently selected from methyl, deuterated methyl, benzyl, diphenylmethyl, triphenylmethyl, ethyl, 2-phenylethyl, 2,2-phenylethyl, 2,2,2-trifluoroethyl, propyl, isopropyl, 3,3,3-trifluoropropyl, 1,1,1,3,3,3-hexafluoro-2-propyl, butyl, isobutyl, hexafluoroisobutyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, phenyl, 2-methylphenyl, 2-isopropylphenyl, 2-ethylphenyl, 4-methylphenyl, 4-isopropylphenyl, 4-ethylphenyl, 4-tert-butylphenyl, 2,3-dimethylphenyl, 2,3-diethylphenyl, 2,3-diisopropylphenyl, 2,3-diisobutylphenyl, 2,3-dicyclohexylphenyl, 2,3-dicyclopropylphenyl, 2,3-dicyclobutylphenyl, 2,3-dicyclopentylphenyl, 2,4-dimethylphenyl, 2,4-diethylphenyl, 2,4-diisopropylphenyl, 2,4-diisobutylphenyl, 2,4-dicyclohexylphenyl, 2,4-dicyclopropylphenyl, 2,4-dicyclobutylphenyl, 2,4-dicyclopentylphenyl, 2,6-dimethylphenyl, 2,6-diethylphenyl, 2,6-diisopropylphenyl, 2,6-diisobutylphenyl, 2,6-dicyclohexylphenyl, 2,6-dicyclopropylphenyl, 2,6-dicyclobutylphenyl, 2,6-dicyclopentylphenyl, 3,5-dimethylphenyl, 3,5-diethylphenyl, 3,5-diisopropylphenyl, 3,5-diisobutylphenyl, 3,5-dicyclohexylphenyl, 3,5-dicyclopropylphenyl, 3,5-dicyclobutylphenyl, 3,5-dicyclopentylphenyl, 2,3,5,6-tetramethylphenyl, 2,4,6-trimethylphenyl, 2,4,6-triethylphenyl, 2,4,6-triisopropylphenyl, 2,4,6-triisobutylphenyl, 2,4,6-tricyclohexylphenyl, 2,4,6-tricyclopropylphenyl, 2,4,6-tricyclobutylphenyl and 2,4,6-tricyclopentylphenyl, one or more of them.

[0065] According to the present invention, in a more preferred case, the platinum complex is selected from at least one of the following complexes 1-15:

[0066]

[0067]

[0068] The second aspect of the present invention provides a method for preparing a platinum complex, wherein the preparation method includes:

[0069] (1) Performing a coupling reaction on compound A shown in formula (a), compound F1 shown in formula (b) and compound F2 shown in formula (c) to obtain intermediate C shown in formula (d);

[0070]

[0071] Wherein, X1 and X2 are the same or different, each being H or a halogen, and not both being H at the same time;

[0072] (2) The intermediate C shown in formula (d) is subjected to an imidazole cyclization reaction with the compound F3 shown in formula (e) to obtain the ligand precursor D shown in formula (f);

[0073] NH4 + Y - (EtO)3CH, formula (e);

[0074]

[0075] Wherein, Y - is an anion;

[0076] (3) The ligand precursor D shown in formula (f) is subjected to a cyclometalation reaction with a platinum salt to obtain the platinum complex shown in formula (I);

[0077] [[ID=P=28]]

[0078] Wherein, R0, R1-R in formula (a), formula (b), formula (c), formula (d), formula (e), formula (f) and formula (I) 15 are the same as those defined above.

[0079] According to the present invention, preferably, X is selected from one or more of iodine, bromine, chlorine and fluorine.

[0080] According to the present invention, preferably, Y - is selected from one or more of trifluoromethanesulfonate, tetrafluoroborate, hexafluorophosphate and trifluoroacetate.

[0081] According to the present invention, in the coupling reaction, it also includes carrying out in the presence of BINAP (Chinese name: 2,2'-bis-(diphenylphosphino)-1,1'-binaphthalene; other names: binaphthalene diphenylphosphine, 1,1'-binaphthalene-2,2'-bisdiphenylphosphine; English name: 2,2'-Bis(diphenylphosphino)-1,1'-binaphthalene; CAS: 98327-87-8; molecular formula: C 44 H 32 P2), tris(dibenzylideneacetone)dipalladium (Pd2(dba)3), sodium tert-butoxide (tBuONa) and toluene (English toluene).

[0082] According to the present invention, preferably, in step (1), the preparation method includes: the compound F1 shown in formula (b) and the compound F2 shown in formula (c) are first subjected to a coupling reaction to obtain the compound F4 shown in formula (g);

[0083]

[0084] Among them, R1, R2, R3, R4, R0 and X in the compound F4 shown in formula (g) have the same definitions as those described above.

[0085] According to the present invention, preferably, relative to 4 - 5 mL of toluene, the molar amount of the compound F1 shown in formula (b) used is 0.5 - 2 mmol, and the molar amount of the compound F2 shown in formula (c) used is 0.5 - 5 mmol.

[0086] According to the present invention, preferably, relative to 4 - 5 mL of toluene, the molar amount of the compound A shown in formula (a) used is 0.5 - 2 mmol, the molar amount of the compound F4 shown in formula (g) used is 0.5 - 5 mmol, the molar amount of BINAP used is 0.01 - 0.5 mmol, the molar amount of tris(dibenzylideneacetone)dipalladium used is 0.01 - 0.5 mmol, and the molar amount of sodium tert - butoxide used is 0.5 - 3 mmol.

[0087] According to the present invention, the conditions for the coupling reaction include: under a N2 atmosphere, at a temperature of 60 - 100 °C, with stirring for 6 - 24 h.

[0088] According to the present invention, in the imidazole cyclization reaction, it also includes carrying out in the presence of ammonium hexafluorophosphate and triethylamine.

[0089] According to the present invention, preferably, relative to 2 mL of triethylamine, the molar amount of the intermediate C shown in formula (d) used is 0.5 - 2 mmol, and the molar amount of ammonium hexafluorophosphate used is 0.5 - 2 mmol.

[0090] According to the present invention, the conditions for the imidazole cyclization reaction include: under a N2 atmosphere, at a temperature of 120 - 130 °C, with stirring for 12 - 72 h.

[0091] According to the present invention, in the cyclometalation reaction, it also includes carrying out in the presence of N,N - dimethylformamide.

[0092] According to the present invention, the platinum salt is platinum dichloride.

[0093] According to the present invention, with respect to 100 mL of N,N-dimethylformamide, the molar amount of the ligand precursor D represented by formula (g) is 0.5 - 4 mmol, and the molar amount of the platinum salt used is 0.5 - 4 mmol.

[0094] According to the present invention, the conditions for the cyclometalation reaction include: under a nitrogen atmosphere, stirring for 12 - 72 h at a temperature of 30 - 100 °C and then heating to 80 - 200 °C and stirring for 12 - 72 h.

[0095] According to a preferred specific embodiment of the present invention, the preparation route of the platinum complex represented by formula (I) is as follows:

[0096]

[0097] According to another preferred specific embodiment of the present invention, the preparation route of the platinum complex represented by formula (I) is as follows:

[0098]

[0099] The third aspect of the present invention provides a platinum complex prepared by the preparation method described above.

[0100] The fourth aspect of the present invention provides an application of the platinum complex described above in an organic optoelectronic device.

[0101] According to the present invention, the platinum complex serves as a phosphorescent material in the organic optoelectronic device. Preferably, the platinum complex serves as a blue-green phosphorescent material in the organic optoelectronic device.

[0102] The fifth aspect of the present invention provides an application of the platinum complex described above in a display device and / or a lighting device.

[0103] The sixth aspect of the present invention provides an organic optoelectronic device, wherein the organic optoelectronic device includes a positive electrode, a negative electrode, and an organic layer disposed between the positive electrode and the negative electrode. The organic layer includes a light-emitting layer, and the light-emitting layer includes the platinum complex described above.

[0104] According to the present invention, preferably, the light-emitting layer contains a host material and / or a dopant material, and one or more of the platinum complexes described above are included in the host material and / or the dopant material.

[0105] In the present invention, the light-emitting layer can be formed by co-doping a host material and a guest material. The guest material of the light-emitting layer can also be selected from any other complex having the chemical structure shown in formula (I). Preferably, the guest material of the light-emitting layer can also be selected from any of the complexes shown in complexes 1 - 15.

[0106] According to the present invention, the organic optoelectronic device is a blue-green light organic optoelectronic device.

[0107] According to the present invention, the organic layer may be composed of a single-layer structure or a multi-layer structure in which two or more organic layers are stacked. For example, as a representative example of the organic electroluminescent device of the present invention, the organic electroluminescent device may have a structure including a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, etc. as organic material layers. However, the structure of the organic electronic device is not limited thereto, and may include a different number of organic layers.

[0108] In an exemplary embodiment of the present invention, each of the first stack and the second stack is an organic material layer including a light-emitting layer, and in addition to the light-emitting layer, the organic material layer may further include one or more organic material layers, such as a hole injection layer, a hole buffer layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0109] Optionally, the organic layer includes a light-emitting layer, and the light-emitting layer includes any one or a combination of at least two of the above-mentioned platinum complexes.

[0110] The organic electroluminescent device of the present invention can be manufactured by materials and methods known in the art, except that one or more layers of the organic material layer contain the platinum complex of the present invention.

[0111] When the organic electroluminescent device includes a plurality of organic layers, the organic layers may be formed of the same material or different materials.

[0112] The organic electroluminescent device of the present invention can be manufactured by materials and methods known in the art, except that one or more layers of the organic layer contain the platinum complex described in the present invention, that is, the platinum complex represented by formula (I). For example, the organic electroluminescent device of the present invention can be manufactured by sequentially stacking a first electrode, an organic layer, and a second electrode on a substrate. In this case, the organic electroluminescent device can be manufactured as follows: By using a physical vapor deposition (PVD) method such as sputtering or electron beam evaporation, a metal or a conductive metal oxide or an alloy thereof is deposited on the substrate to form a positive electrode, an organic layer including a hole injection layer, a hole transport layer, a light-emitting layer, and an electron transport layer is formed thereon, and then a material that can be used as a negative electrode is deposited thereon. In addition to the method described above, the organic electronic device can be manufactured by sequentially depositing a negative electrode material, an organic layer, and a positive electrode material on a substrate.

[0113] In addition, when manufacturing an organic electroluminescent device, the platinum complex represented by formula (I) can be formed into an organic layer not only by vacuum deposition but also by solution application. Herein, the solution application method means one or more of spin coating, dip coating, blade coating, inkjet printing, screen printing, spraying, and roll coating, but is not limited thereto.

[0114] Optionally, the preparation method includes sequentially placing a crucible containing an OLED organic material and a crucible containing metallic aluminum grains at the positions of the organic evaporation source and the inorganic evaporation source. Close the cavity and perform the initial vacuum pumping and high vacuum pumping steps to make the vacuum degree inside the OLED evaporation equipment reach 10 -7 Torr. OLED evaporation film forming method: Turn on the OLED organic evaporation source, preheat the OLED organic material at 100 °C for 15 minutes to ensure further removal of water vapor in the OLED organic material. Then perform a rapid heating treatment on the organic material to be evaporated, and open the baffle above the evaporation source until organic material runs out of the evaporation source of this material, and at the same time when the crystal oscillator detector detects the evaporation rate, then perform a slow heating with a heating rate of 3 °C until the evaporation rate stabilizes at 1 Å / second, open the baffle directly below the mask plate to perform OLED film formation. When the organic film on the ITO substrate reaches the preset film thickness as observed on the computer side, close the baffle of the mask plate and the baffle directly above the evaporation source, and turn off the evaporation source heater of this organic material. The evaporation processes of other organic materials and cathode metal materials are as described above. Encapsulation is performed by photo-curing encapsulation using UV epoxy resin.

[0115] In an exemplary embodiment of the present application, the first electrode is a positive electrode, and the second electrode is a negative electrode. In another exemplary embodiment, the first electrode is a negative electrode, and the second electrode is a positive electrode.

[0116] As the positive electrode material, materials having a large work function are generally preferably used to enable holes to be smoothly injected into the organic material layer. Specific examples of positive electrode materials that can be used in the present invention include: metals such as vanadium, chromium, copper, zinc, and gold, or their alloys; metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); combinations of metals and oxides such as ZnO:Al or SnO2:Sb; conductive polymers such as poly(3-methylthiophene), polypyrrole, and polyaniline, etc., but are not limited thereto.

[0117] As the negative electrode material, materials having a small work function are generally preferably used to enable electrons to be smoothly injected into the organic layer. Specific examples of negative electrode materials include: metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead, or their alloys; multi-layer structure materials such as LiF / Al or LiO2 / Al, etc., but are not limited thereto.

[0118] The hole injection layer is a layer that injects holes from the electrode, and the hole injection material is preferably a compound that has the ability to transport holes and thus has an excellent effect of injecting holes at the positive electrode and injecting holes into the light-emitting layer or light-emitting material, prevents excitons generated by the light-emitting layer from migrating to the electron injection layer or electron injection material, and is also excellent in the ability to form a thin film. Preferably, the highest occupied molecular orbital (HOMO) of the hole injection material is between the work function of the positive electrode material and the HOMO of the surrounding organic material layer. Specific examples of the hole injection material include metal porphyrins, oligothiophenes, arylamine-based organic materials, hexanitrile hexaazatriphenylene-based organic materials, quinacridone-based organic materials, perylene-based organic materials, anthraquinone, polyaniline-based and polythiophene-based conductive polymers, etc., but are not limited thereto.

[0119] The hole transport layer is a layer that receives holes from the hole injection layer and transports the holes to the light-emitting layer, and the hole transport material is appropriately a material that can receive holes transported from the positive electrode or the hole injection layer to transfer the holes to the light-emitting layer and has a high mobility for holes. Specific examples thereof include arylamine-based organic materials, conductive polymers, block copolymers having both a conjugated part and a non-conjugated part, etc., but are not limited thereto.

[0120] The light-emitting layer material is preferably a material that can receive holes and electrons transported by the hole transport layer and the electron transport layer respectively, combine the holes and electrons to emit light in the visible light region, and has a good quantum efficiency for fluorescence or phosphorescence. Specific examples thereof include: tris(8-hydroxyquinoline)aluminum (Alq3); carbazole-based compounds; distyryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compounds; compounds based on benzopyrazole, benzothiazole, and benzimidazole; polymers based on poly(p-phenylenevinylene) (PPV); spiro compounds; polyfluorene; rubrene, etc., but are not limited thereto.

[0121] The light-emitting layer may contain a host material and a dopant material. Examples of the host material include fused aromatic ring derivatives or heterocyclic-containing compounds, etc. Specific examples of the fused aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, fluoranthene compounds, etc., and specific examples of the heterocyclic-containing compounds include compounds, dibenzofuran derivatives, ladder-type furan compounds, pyrimidine derivatives, etc., but the examples are not limited thereto.

[0122] The electron transport layer is a layer that receives electrons from the electron injection layer and transports the electrons to the light-emitting layer, and the electron transport material is preferably a material that can well receive electrons from the negative electrode, transfer the electrons to the light-emitting layer, and has a high electron mobility. Specific examples thereof include: Al complexes of 8-hydroxyquinoline, complexes containing Alq3, organic radical compounds, hydroxy blue-green ketone-metal complexes, etc., but are not limited thereto. The electron transport layer can be used together with any desired cathode material used according to the prior art. In particular, suitable examples of the cathode material are typical materials having a low work function, followed by an aluminum layer or a silver layer. Specific examples thereof include cesium, barium, calcium, ytterbium, and samarium, each followed by an aluminum layer or a silver layer in each case.

[0123] The electron injection layer is a layer that injects electrons from the electrode, and the electron injection material is preferably a compound that has the ability to transport electrons, has an effect of injecting electrons from the negative electrode, and an excellent effect of injecting electrons into the light-emitting layer or the light-emitting material, prevents excitons generated in the light-emitting layer from migrating to the hole injection layer, and also has excellent ability to form a thin film. Specific examples thereof include fluorenone, anthraquinone dimethane, biphenylquinone, thiopyran dioxide, oxazole, dioxazole, triazole, imidazole, perylene tetracarboxylic acid, fluoreneylidene methane, anthrone, etc. and their derivatives, metal complex compounds, nitrogen-containing 5-membered ring derivatives, etc., but are not limited thereto.

[0124] The hole blocking layer is a layer that blocks holes from reaching the negative electrode, and can generally be formed under the same conditions as those of the hole injection layer. Specific examples thereof include dioxazole derivatives or triazole derivatives, phenanthroline derivatives, aluminum complexes, etc., but are not limited thereto.

[0125] According to the materials used, the organic light-emitting device according to the present specification can be a top-emitting type, a bottom-emitting type, or a double-sided emitting type.

[0126] According to a preferred specific embodiment of the present invention, an organic electroluminescent device is provided. A platinum complex (complex) prepared by the present invention is doped into a host material to prepare an OLED device, and the doping amount is 5-10%. The cross-sectional view of the prepared OLED device is as Figure 11 shown. In the preparation of the OLED device, ITO is the anode of the OLED device, and Al is the cathode of the OLED device. The device structure is: ITO / HIL / HTL / EML / ETL / Al, where:

[0127] The HIL hole injection layer is HATCN, Re2O3;

[0128] HTL is the hole transport layer, which can be but is not limited to TAPC, NPD, TCTA, PT301, BCP, mCP, m-MTDATA, TPTA, BTB, TPD here;

[0129] The EML layer is the light-emitting layer complex: host material = 5%: 95%;

[0130] The host material can be but is not limited to CBP, mCBP, 2,6mCPy, 26DCzPPY, TCP, BPyPPM, DPEPO, SiCzCz, SiTrzCz2, mSiTrz;

[0131] The ETL layer is the electron transport layer, which can be but is not limited to TmPyPb, TPBi, DPPS, Bphen, BmPyPb, DBFTrz, TpPyPb, mSiTrz here.

[0132] In addition, in the present invention:

[0133] HATCN (Chinese name: 2,3,6,7,10,11-Hexacyano-1,4,5,8,9,12-hexaazatriphenylene material, English name: 2,3,6,7,10,11-Hexaazatriphenylenehexacabonitrile);

[0134] Re2O3 (Chinese name: Molybdenum(VI)oxide, English name: Molybdenum(VI)oxide);

[0135] TAPC (Chinese name: 4,4′-cyclohexylidenebis[N,N-bis(p-tolyl)aniline], English name: 4,4′-cyclohexylidenebis[N,N-bis(p-tolyl)aniline];

[0136] NPD (Chinese name: N,N’-Bis-(1-naphthalenyl)-N,N’-bis-phenyl-(1,1′-biphenyl)-4,4′-diamine, English name: N,N’-Bis-(1-naphthalenyl)-N,N’-bis-phenyl-(1,1′-biphenyl)-4,4′-diamine);

[0137] TCTA (Chinese name: 4,4′,4”-Tris(carbazol–9-yl)triphenylamine, English name: 4,4′,4”-Tris(carbazol–9-yl)triphenylamine);

[0138] PT301 (Chinese name: 4,4'-Bis[N,N-di(biphenyl-4-yl)amino]-1,1'-biphenyl; English name: 4,4'-Bis[N,N-di(biphenyl-4-yl)amino]-1,1'-biphenyl);

[0139] BCP (Chinese name: 2,9-Dimethyl-4,7-diphenyl-1,10-Phenanthroline; English name: 2,9-dimethyl-4,7-diphenyl-1,10-Phenanthroline);

[0140] mCP (Chinese name: 1,3-Bis(N-carbazolyl)benzene; English name: 1,3-bis(N-carbazolyl)benzene);

[0141] m-MTDATA (Chinese name: 4,4′,4”-Tris[phenyl(m-tolyl)amino]triphenylamine; English name: 4,4′,4”-Tris[phenyl(m-tolyl)amino]triphenylamine);

[0142] TPTA (Chinese name: 4,4′,4”-Trimethyltriphenylamine; English name: 4,4′,4”-Trimethyltriphenylamine);

[0143] BTB (Chinese name: 4,4’-Bis(4,6-diphenyl-1,3,5-Triazine-2-yl)biphenyl; English name: 4,4’-bis(4,6-diphenyl-1,3,5-Triazine-2-yl)biphenyl);

[0144] TPD (Chinese name: N,N’-Bis(3-methylphenyl)-N,N’-bis(phenyl)benzidine; English name: N,N’-Bis(3-methylphenyl)-N,N’-bis(phenyl)benzidine);

[0145] CBP (Chinese name: 4,4'-Bis(9-carbazolyl)-1,1'-biphenyl; English name: 4,4'-Bis(9-carbazolyl)-1,1'-biphenyl);

[0146] mCBP (Chinese name: 3,3'-Di(9H-carbazol-9-yl)-1,1'-biphenyl (purified by sublimation); English name: 3,3'-Di(9H-carbazol-9-yl)-1,1'-biphenyl(purified by sublimation);

[0147] 2,6mCPy (Chinese name: 2,6-Di(9-carbazolyl)pyridine; English name: 2,6-Di(9H-carbazol-9-yl)pyridine);

[0148] 26DCzPPY (Chinese name: 2,6-Bis((9H-carbazol-9-yl)-3,1-phenylene)pyridine; English name: 2,6-bis(3-(9H-carbazol-9-yl)phenyl)pyridine);

[0149] TCP (Chinese name: 1,3,5-Tri(9-carbazolyl)benzene; English name: 1,3,5-Tri(9-carbazolyl)benzene);

[0150] BPyPPM (Chinese name: 2-Phenyl-bis-4,6-(3,5-dipyridylphenyl)pyrimidine; English name: 2-phenyl-bis-4,6-(3,5-dipyridylphenyl)pyrimidine);

[0151] DPEPO (Chinese name: Bis[2-(diphenylphosphoryl)phenyl]etherBis[2-(oxodiphenylphosphino)phenyl]ether; English name: Bis[2-(diphenylphosphoryl)phenyl]etherBis[2-(oxodiphenylphosphino)phenyl]ether)

[0152] TmPyPb (Chinese name: 3,3'-[5'-[3-(3-pyridyl)phenyl][1,1':3',1”-terphenyl]-3,3”-diyl]dipyridine; English name: 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene);

[0153] TPBi (Chinese name: 1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene; English name: 1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene);

[0154] DPPS (Chinese name: Diphenyldi[4-(pyridin-3-yl)phenyl]silane; English name: Diphenylbis(4-(pyridin-3-yl)phenyl)silane);

[0155] Bphen (Chinese name: 4,7-Diphenyl-1,10-phenanthroline; English name: 4,7-diphenyl-1,10-phenanthroline);

[0156] BmPyPb (Chinese name: 1,3-bis(3,5-dipyridin-3-ylphenyl)benzene; English name: 1,3-bis[3,5-di(pyridin-3-yl)phenyl]benzene);

[0157] DBFTrz (Chinese name: 2,8-bis(4,6-diphenyl-1,3,5-triazin-2-yl)dibenz[b,d]furan; English name: 2,8-bis(4,6-diphenyl-1,3,5-triazin-2-yl)dibenzo[b,d]furan)

[0158] TpPyPb (Chinese name: 1,3,5-tri(4-pyrid-3-ylphenyl)benzene; English name: 1,3,5-Tri(4-pyrid-3-ylphenyl)benzene).

[0159] BCFN (Chinese name: N-biphenyl-4-yl-9,9-dimethyl-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]-9H-fluoren-2-amine; English name: N-([1,1'-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine).

[0160] SiCzCz (Chinese name: 9-[3-(triphenylsilyl)phenyl]-3,9'-Bi-9H-carbazole; English name: 9-[3-(triphenylsilyl)phenyl]-3,9'-Bi-9H-carbazole).

[0161] mSiTrz (Chinese name: 2-phenyl-4,6-bis[3-(triphenylsilyl)phenyl]-1,3,5-triazine; English name: 2-phenyl-4,6-bis[3-(triphenylsilyl)phenyl]-1,3,5-Triazine).

[0162] SiTrzCz2 (Chinese name: 9,9'-[6-[3-(triphenylsilyl)phenyl]-1,3,5-triazine-2,4-diyl]bis-9H-carbazole; English name: 9,9'-[6-[3-(triphenylsilyl)phenyl]-1,3,5-triazine-2,4-diyl]bis-9H-Carbazole).

[0163] NDP-9 (Chinese name: 2,2'-(1,3,4,5,6,8,9,10-octafluoro-2,7-pyrenediylidene)bis-Propanedinitrile; English name: 2,2'-(1,3,4,5,6,8,9,10-octafluoro-2,7-pyrenediylidene)bis-Propanedinitrile).

[0164] The present invention will be described in detail below with reference to examples.

[0165] In the following examples:

[0166] (1) Nuclear magnetic resonance spectroscopy: In CDCl3 or DMSO-d6 solution, 1H NMR (proton nuclear magnetic resonance) and 13C NMR (carbon nuclear magnetic resonance) spectra were recorded on a Varian liquid nuclear magnetic resonance spectrometer at 300 MHz, 400 MHz or 500 MHz, and the chemical shifts were referenced to the residual protonated solvent. If CDCl3 was used as the solvent, tetramethylsilane (δ = 0.00 ppm) was used as an internal reference to record the 1H NMR spectrum; CDCl3 (δ = 77.00 ppm) was used as an internal reference to record the 13C NMR spectrum. If DMSO-d6 was used as the solvent, residual H2O (δ = 3.33 ppm) was used as an internal reference to record the 1H NMR spectrum; DMSO-d6 (δ = 39.52 ppm) was used as an internal reference to record the 13C NMR spectrum. The following abbreviations were used to describe the multiplicity of 1H NMR: s = singlet, d = doublet, t = triplet, q = quartet, p = quintet, m = multiplet, br = broad. 1 1H NMR (proton nuclear magnetic resonance) and 13 13C NMR (carbon nuclear magnetic resonance) spectra were at 300 MHz, 400 MHz or 500 MHz, and the chemical shifts were referenced to the residual protonated solvent. If CDCl3 was used as the solvent, tetramethylsilane (δ = 0.00 ppm) was used as an internal reference to record the 1 1H NMR spectrum; CDCl3 (δ = 77.00 ppm) was used as an internal reference to record the 13 13C NMR spectrum. If DMSO-d6 was used as the solvent, residual H2O (δ = 3.33 ppm) was used as an internal reference to record the 1 1H NMR spectrum; DMSO-d6 (δ = 39.52 ppm) was used as an internal reference to record the 13 13C NMR spectrum. The following abbreviations were used to describe the multiplicity of 1 1H NMR: s = singlet, d = doublet, t = triplet, q = quartet, p = quintet, m = multiplet, br = broad.

[0167] (2) Mass spectrometry: Electrospray ionization mass spectrometry (ESI-MS) was performed on some compounds using a Waters Aquity Qda ultra-high pressure liquid chromatography-mass spectrometry device, or high-resolution mass spectrometry was performed using a matrix-assisted ionization time-of-flight mass spectrometry instrument (MALDI-TOF-MS).

[0168] (3) Material purification: The final product platinum complex was separated by column chromatography and preparative HPLC, and then sublimated and purified to the purity required for device fabrication using an ultra-high vacuum (10 -4 ~10 -5 Pa) sublimation purification device.

[0169] (4) High performance liquid chromatography analysis: Using methanol / water (1 / 9) as the mobile phase, the purity of the platinum complex sample was analyzed.

[0170] (5) Cyclic voltammetry curve test and energy level calculation: A three-electrode system was used for the test, with a platinum column as the working electrode, a platinum wire as the counter electrode, and silver / silver chloride (Ag / AgCl) as the reference electrode. Under a nitrogen atmosphere, the sample was tested using N,N-dimethylformamide containing 0.1 M tetrabutylammonium hexafluorophosphate as the solvent, ferrocene as the internal standard, and the scanning rate was 100 mV / s. According to formulas 5-1 and 5-2 and the CV test results, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of the platinum complex molecule can be calculated. Since the potential of ferrocene relative to the reference electrode in the DMF solution was not a fixed value but had a slight difference in different platinum complex solutions, we chose the ferrocene redox potential measured in the current test for the calculation.

[0171] HOMO = -[E ox - E Fc / Fc+ox + 4.8] eV 5-1

[0172] LUMO = -[E red - E Fc / Fc+red + 4.8] eV 5-2

[0173] Where: E ox , E red are the starting potentials of the oxidation peak and reduction peak of the sample respectively, and E Fc / Fc+ox , E Fc / Fc+red are the starting potentials of the oxidation peak and reduction peak of ferrocene respectively, and 4.8 is the vacuum energy level of ferrocene.

[0174] ((6) Ultraviolet-visible absorption spectrum test: The absorption spectrum of the platinum complex in dichloromethane solution at room temperature was tested, with a scanning range of 250 - 500 nm and an interval of 1 nm.

[0175] (7) Steady-state spectrum test: The spectra of the platinum complex in dichloromethane solution at room temperature, the luminescence spectrum / excitation spectrum of 77K 2-methyltetrahydrofuran, and the spectrum of a 5wt% doped poly(methyl methacrylate) (PMMA) thin film were tested. The dichloromethane solution spectrum was tested after thoroughly purging nitrogen into the solvent; the polymer-doped thin film was prepared by spin coating using chloroform as the solvent and a quartz sheet as the thin film carrier in a glove box; the thin film sample was tested in a glove box or a vacuum chamber to reduce the quenching effect of oxygen on the luminescence of the complex. In addition, the photoluminescence quantum yield (PLQY) of the platinum complex solution and thin film was also tested using an integrating sphere.

[0176] (8) Transient spectroscopy and phosphorescence lifetime measurement: Time-resolved spectroscopy and half-life measurement of luminescence lifetime were performed on the dichloromethane solution of the platinum complex at room temperature using a Fluorolog-3 full-spectrum optical platform, and lifetime measurement was carried out on the 5 wt% doped PMMA film. The measurements were all carried out under nitrogen or vacuum conditions.

[0177] Example 1

[0178] This example is used to illustrate the complex 2 prepared by the present invention, and its preparation method specifically includes the following steps:

[0179] 1) Synthesis of N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-isopropylbenzene-1,2-diamine:

[0180]

[0181] Add 2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine (262 mg, 1 mmol), 2-bromo-N-isopropylaniline (100 mg, 1 mmol), BINAP (62 mg, 0.1 mmol), tris(dibenzylideneacetone)dipalladium (Pd2(dba)3) (46 mg, 0.05 mmol), sodium tert-butoxide tBuONa (145 mg, 1.5 mmol) and toluene (4 ml) to a 48 mL sealed tube with a magnetic rotor. After connecting the resulting mixture to a three-way device filled with nitrogen, heat it to 60 °C and stir for 6 hours. Cool to room temperature, quench the reaction with water, then extract with ethyl acetate. Combine the organic phases, wash with an appropriate amount of saturated sodium chloride aqueous solution, dry with anhydrous sodium sulfate, distill off the solvent under reduced pressure, and purify the obtained crude product by silica gel column chromatography. The eluent is petroleum ether∶ethyl acetate = 5∶1 (volume ratio) to obtain the white solid N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-isopropylbenzene-1,2-diamine with a yield of 50%.

[0182] 2) Synthesis of N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine phosphate:

[0183]

[0184] Add N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-isopropylbenzene-1,2-diamine (502 mg, 1 mmol), ammonium hexafluorophosphate (171 mg, 1 mmol) and triethylamine (2 ml) to a 15 mL sealed tube with a magnetic rotor. After the resulting mixture is bubbled with nitrogen for 10 minutes, it is heated to 120 °C and stirred for 24 hours. After cooling to room temperature, it is washed with petroleum ether, and then the solvent is removed by distillation under reduced pressure to obtain the white solid N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine phosphate with a yield of 90%.

[0185] 3) Synthesis of Complex 2:

[0186]

[0187] Add 2-(2-(3-(3,5-dimethyl-1H-pyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)pyridine (658 mg, 1 mmol), platinum(II) chloride (815 mg, 1.9 mmol) and N,N-dimethylformamide (100 mL) to a 350 mL sealed tube with a magnetic rotor. After the resulting mixture is bubbled with nitrogen for 10 minutes, it is stirred at 30 °C for 24 hours and then heated to 120 °C and stirred for 24 hours. After cooling to room temperature, the reaction is quenched with water, extracted with dichloromethane, the organic phases are combined, washed with an appropriate amount of saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and the solvent is removed by distillation under reduced pressure. The resulting crude product is separated and purified by silica gel column chromatography with an eluent of dichloromethane∶petroleum ether = 1∶1 (volume ratio) to obtain the yellow solid Complex 2 with a yield of 30%.

[0188] Figure 5 This is the 1H NMR spectrum of a single molecule of Complex 2 prepared in Example 1. The 1H NMR (400 MHz, DMSO-d6) results are as follows: δ 9.15 (d, J = 8.4 Hz, 1H), 7.99 (d, J = 8.0 Hz, 1H), 7.71 - 7.68 (m, 3H), 7.51 - 7.41 (m, 2H), 7.38 - 7.30 (m, 3H), 7.24 - 7.17 (m, 2H), 6.17 (s, 1H), 5.50 - 5.43 (m, 1H), 2.74 (s, 3H), 2.65 (s, 3H), 1.77 (d, J = 7.2 Hz, 6H). MS (ESI) measured 706.3 [M + H]+. The 1H NMR spectrum shows that the complex can exist independently and stably, and is easy to separate, purify and characterize. From the NMR spectrum, in addition to the stable structural characterization of Complex 2, no signals of aggregated morphology are shown for Complex 2, indicating that the molecules of Complex 2 exist in a single-molecule separated state in the solution state.

[0189] Example 2

[0190] This example is used to illustrate the complex 7 prepared by the present invention, and its preparation method specifically includes the following steps:

[0191] 1) Synthesis of N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine:

[0192]

[0193] In a glove box, add 2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine (262 mg, 1 mmol), o-dibromobenzene (472 mg, 2 mmol), tris(dibenzylideneacetone)dipalladium(0) (46 mg, 0.05 mmol), BINAP (62 mg, 0.1 mmol), sodium tert-butoxide (145 mg, 1.5 mmol) and toluene (5 mL) into a 48 mL sealed tube with a magnetic rotor. After bubbling nitrogen through the resulting mixture for 10 minutes, heat it to 100 °C and stir for 24 hours. Cool to room temperature, quench the reaction with water, then extract with ethyl acetate. Combine the organic phases, wash with an appropriate amount of saturated sodium chloride aqueous solution, dry over anhydrous sodium sulfate, and remove the solvent by distillation under reduced pressure. Purify the obtained crude product by silica gel column chromatography, and the eluent is petroleum ether∶ethyl acetate = 25∶1 (volume ratio) to obtain white solid N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine with a yield of 40%.

[0194] 2) Synthesis of N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine:

[0195]

[0196] In a glove box, N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine (523 mg, 1 mmol), 2,4,6-trimethylaniline (202 mg, 1.5 mmol), tris(dibenzylideneacetone)dipalladium(0) (46 mg, 0.05 mmol), BINAP (62 mg, 0.1 mmol), sodium tert-butoxide (145 mg, 1.5 mmol) and toluene (5 mL) were added to a 48 mL sealed tube equipped with a magnetic rotor. The resulting mixture was bubbled with nitrogen for 10 minutes and then heated to 100 °C and stirred for 24 hours. After cooling to room temperature, the reaction was quenched by adding water, and then extracted with ethyl acetate. The organic phases were combined, washed with an appropriate amount of saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and the solvent was removed by distillation under reduced pressure. The obtained crude product was separated and purified by silica gel column chromatography with the eluent of petroleum ether∶ethyl acetate = 25∶1 (volume ratio) to obtain a white solid N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine with a yield of 60%.

[0197] 3) Synthesis of N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine phosphate:

[0198]

[0199] N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine (578 mg, 1 mmol), ammonium hexafluorophosphate (171 mg, 1 mmol) and triethylamine (2 mL) were added to a 15 mL sealed tube equipped with a magnetic rotor. The resulting mixture was bubbled with nitrogen for 10 minutes and then heated to 120 °C and stirred for 24 hours. After cooling to room temperature, it was washed with petroleum ether, and the solvent was removed by distillation under reduced pressure to obtain a white solid N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine phosphate with a yield of 90%.

[0200] 4) Synthesis of complex 7:

[0201]

[0202] To a sealed tube with a magnetic rotor containing 350 mL, add N1-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)-N2-m-phenylbenzene-1,2-diamine phosphate (734 mg, 1 mmol), platinum dichloride (815 mg, 1.9 mmol)), and N,N-dimethylformamide (100 mL). After the resulting mixture was bubbled with nitrogen for 10 minutes, it was stirred at 30 °C for 24 hours, then heated to 120 °C and stirred for 24 hours. After cooling to room temperature, the reaction was quenched with water, extracted with dichloromethane, the organic phases were combined, washed with an appropriate amount of saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and the solvent was removed by distillation under reduced pressure. The resulting crude product was separated and purified by silica gel column chromatography, and the eluent was dichloromethane∶petroleum ether = 1∶1 (volume ratio), to obtain a yellow solid complex 7 with a yield of 15%.

[0203] Figure 6 1H NMR spectrum of a single molecule of complex 7, 1HNMR(400MHz, DMSO-d6) results are as follows: δ8.98(d,J = 8.4Hz,1H),8.01(s,1H),7.74(s,1H),7.71(d,J = 8.0Hz,1H),7.50 - 7.45(m,2H),7.38 - 7.38(m,2H),7.27 - 7.26(m,1H),7.23 - 7.20(m,2H),7.16(d,J = 1.2Hz,2H),6.85(s,1H),5.82(s,1H),2.65(s,3H),2.41(s,3H),2.17(s,6H),1.61(s,3H). MS(ESI) measured 782.4[M + H]+. The hydrogen spectrum shows that this complex can exist independently and stably, and is easy to separate, purify and characterize. From the NMR spectrum, in addition to the stable structural characterization of complex 7, complex 7 does not show signals of an aggregated form, indicating that the molecules of complex 7 exist in a single-molecule separated state in the solution state.

[0204] Example 3

[0205] This example is used to prepare complex 8 of the present invention, and its preparation method specifically includes the following steps:

[0206] 1) Synthesis of N1-(2,6-diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine:

[0207]

[0208] In a glove box, N-(2-bromophenyl)-2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-amine (523 mg, 1 mmol), 2,6-diisopropylaniline (202 mg, 1.5 mmol), tris(dibenzylideneacetone)dipalladium(0) (46 mg, 0.05 mmol), BINAP (62 mg, 0.1 mmol), sodium tert-butoxide (145 mg, 1.5 mmol) and toluene (5 mL) were added to a 48 mL sealed tube equipped with a magnetic rotor. After the resulting mixture was bubbled with nitrogen for 10 minutes, it was heated to 100 °C and stirred for 24 hours. Then it was cooled to room temperature, the reaction was quenched with water, and then extracted with ethyl acetate. The organic phases were combined, washed with an appropriate amount of saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and the solvent was removed by distillation under reduced pressure. The obtained crude product was separated and purified by silica gel column chromatography, and the eluent was petroleum ether∶ethyl acetate = 25∶1 (volume ratio) to obtain the white solid N1-(2,6-diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine with a yield of 60%.

[0209] 2) Synthesis of N1-(2,6-diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine phosphate:

[0210]

[0211] N1-(2,6-Diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine (620 mg, 1 mmol), ammonium hexafluorophosphate (171 mg, 1 mmol) and triethylamine (2 mL) were added to a 15 mL sealed tube equipped with a magnetic rotor. After the resulting mixture was bubbled with nitrogen for 10 minutes, it was heated to 120 °C and stirred for 24 hours. Then it was cooled to room temperature, and after washing with petroleum ether, the solvent was removed by distillation under reduced pressure to obtain the white solid N1-(2,6-diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine phosphate with a yield of 90%.

[0212] 3) Synthesis of Complex 8:

[0213]

[0214] Add N1-(2,6-diisopropylphenyl)-N2-(2-(3-(3,5-dimethylpyrazol-1-yl)phenoxy)dibenz[b,d]furan-4-yl)benzene-1,2-diamine phosphate (776 mg, 1 mmol), platinum dichloride (262 mg, 1.9 mmol)) and N,N-dimethylformamide (100 mL) to a 350 mL sealed tube with a magnetic rotor. After bubbling the resulting mixture with nitrogen for 10 minutes, stir it at 30 °C for 24 hours, then heat it to 120 °C and stir for 24 hours. Cool it to room temperature, quench the reaction with water, extract with dichloromethane, combine the organic phases, wash with an appropriate amount of saturated sodium chloride aqueous solution, dry over anhydrous sodium sulfate, remove the solvent by distillation under reduced pressure, and purify the obtained crude product by silica gel column chromatography. The eluent is dichloromethane∶petroleum ether = 1∶1 (volume ratio) to obtain a yellow solid complex 7 with a yield of 15%.

[0215] Figure 7 1H NMR spectrum of a single molecule of complex 8, 1HNMR(400MHz, DMSO-d6) results are as follows: δ8.79 (d, J = 8.4Hz, 1H), 0.05 - 8.03 (m, 1H), 7.78 (d, J = 0.6Hz, 1H), 7.70 (d, J = 8.4Hz, 1H), 7.56 - 7.50 (m, 2H), 7.45 - 7.40 (m, 2H), 7.38 - 7.35 (m, 2H), 7.23 (m, 2H), 7.27 - 7.20 (m, 2H), 7.18 - 7.14 (m, 2H), 6.84 (d, J = 8.0Hz, 1H), 5.83 (s, 1H), 3.20 (m, 2H), 1.37 (s, 3H), 1.30 (m, 3H), 0.92 (d, J = 6.8Hz, 6H), 0.88 (d, J = 6.8Hz, 6H). MS(ESI) measured 824.6[M + H]+. The hydrogen spectrum shows that this complex can exist independently and stably, and is easy to separate, purify and characterize. From the NMR spectrum, in addition to the stable structural characterization of this complex 8, this complex 8 does not show signals of an aggregated form, indicating that the complex 8 molecules exist in a single-molecule separated state in the solution state.

[0216] Test Example 1

[0217] For complexes 2, 7 and 8 prepared in Examples 1 - 3 of the present invention, dissolve them in dichloromethane (DCM) at a weight ratio of 5% respectively to form solutions and dope them in polymethyl methacrylate (PMMA) to obtain films, and then conduct the following tests on the obtained solutions or films:

[0218] Optical property test of the luminescent material: where λ is the peak wavelength of the platinum complex dissolved in dichloromethane, FWHM is its full width at half maximum, and the triplet photon energy (ET1) of the material is calculated from the formula 1240 / λ0→1 (λ0→1 is the first vibration peak under 77K conditions), with the unit of electron volt (eV). The test results are shown in the luminescence performance of Complex in Table 1.

[0219] Table 1

[0220]

[0221] Where: a is the dichloromethane solution, and b is the PMMA film;

[0222] From the data in Table 1, it can be seen that the peak wavelengths of Complex 2, Complex 7, and Complex 8 prepared in Examples 1-3 of the present invention are between 491-494 nm, their full widths at half maximum are all about 21-46 nm, the fluorescence efficiency of photoluminescence is between 67-99%, and the emission wavelength changes little in the solution and the film, indicating that it is little affected by the environment and has stable luminescence, indicating that the platinum complex with the structure shown in Formula (I) is a high-efficiency wide-spectrum blue-green phosphorescent luminescent material.

[0223] Figure 1 Shows the luminescence spectrogram of Complex 2 prepared in Example 1 in the solution and the film; under the excitation of 380 nm ultraviolet light, the luminescence wavelength in the dichloromethane solution is 494 nm, the full width at half maximum is 45 nm, the luminescence wavelength in the PMMA film is 493 nm, and the full width at half maximum is 46 nm. The wavelengths of the complex are all in the blue-green phosphorescent region. It shows that the complex is an excellent blue-green light-emitting material.

[0224] Figure 2 Shows the luminescence spectrogram of Complex 7 prepared in Example 2 in the film. Under the excitation of 380 nm ultraviolet light, the luminescence wavelength in the dichloromethane solution is 492 nm, the full width at half maximum is 21 nm, the luminescence wavelength in the PMMA film is 491 nm, and the full width at half maximum is 21 nm. The wavelengths of the complex are all in the blue-green phosphorescent region, and the full width at half maximum is only 21 nm in both the solution and the film, indicating high color purity of the molecule.

[0225] Figure 3 Shows the luminescence spectrogram of Complex 8 prepared in Example 3 in the film. Under the excitation of 380 nm ultraviolet light, the luminescence wavelength in the dichloromethane solution is 494 nm, the full width at half maximum is 21 nm, and the luminescence wavelength in the PMMA is 494 nm, and the full width at half maximum is 21 nm. Compared with Complex 2, the spectrum of Complex 3 in the film has a red shift. Similar to Complex 2, an obvious emission spectrum also appears at 494 nm, and the full width at half maximum is narrow, indicating good color purity.

[0226] Figure 4 The UV-Vis absorption spectrum of complex 2 prepared in Example 1 in a DCM solution is shown. According to the absorption spectrum, it can be known that the absorption in the range of 200-300 nm is very strong. Among them, complex 2 has strong absorption bands around 225-260 nm, and this absorption region is attributed to the ligand spin-allowed 1LC (π-π*) transition; the absorption band in the range of 320-480 nm is attributed to the spin-allowed metal-to-ligand charge transfer transition (1MLCT) and ligand-to-ligand charge transfer transition ( 1 LLCT); the weak absorption band above 400 nm belongs to the spin-forbidden 3MLCT and 3LC transitions. The energy absorption of such molecules is very efficient, and they can be preferred molecular structures for doped material molecules.

[0227] Application Example 1

[0228] According to Application Example 1, an organic electroluminescent device is provided. Complex 2 prepared in Example 1 of the present invention is used as a luminescent material and doped into a host material to prepare an OLED device. The doping amount is 5%. The cross-sectional view of the prepared OLED device is as Figure 11 shown. In the preparation of the OLED device, ITO is the anode (Anode) of the OLED device, and Al is the cathode (Cathode) of the OLED device. The device structure is: ITO / HIL / HTL / EML / ETL / Al, where:

[0229] The HIL hole injection layer is HATCN, Re2O3,

[0230] The HTL is the hole transport layer, which can be but is not limited to TAPC, NPD, TCTA, PT301, BCP, mCP, m-MTDATA, TPTA, BTB, TPD,

[0231] The EML layer is the light-emitting layer, complex 2: host material = 5%: 95%,

[0232] The host material can be but is not limited to CBP, mCBP, 2,6mCPy, 26DCzPPY, TCP, BPyPPM, DPEPO,

[0233] The ETL layer is the electron transport layer, which can be but is not limited to TmPyPb, TPBi, DPPS, Bphen, BmPyPb, DBFTrz, TpPyPb.

[0234] Application Example 2

[0235] This Application Example 2 provides an organic electroluminescent device, as Figure 11As shown in the figure, it includes an anode layer 1, a hole injection layer 2, a hole transport layer 3, a light-emitting layer 4, an electron transport layer 5, and a cathode layer 6 that are sequentially arranged from bottom to top on a glass substrate; the device structure is ITO / HIL(10nm) / HTL(50nm) / EML(30nm) / ETL(40nm) / Mg-Ag(150nm) / CPL.

[0236] Among them; the anode layer 1 is made of ITO material, that is, indium tin oxide material;

[0237] The material of the hole injection layer 2 is PT301 doped with 1.5% NDP-9;

[0238] The material of the hole transport layer 3 is PT301 material;

[0239] The light-emitting layer 4 is formed by co-doping a host material and a guest material. Among them, the host material is a SiCzCz-SiTrzCz2 mixture material, and the guest material is complex 7. The mass of complex 7 accounts for 5% of the total mass of the host material and the guest material;

[0240] The material of the electron transport layer 5 is mSiTrz;

[0241] The material of the cathode layer 6 is metal Mg-Ag.

[0242] The additional CPL layer is PT301.

[0243] Application Example 3

[0244] This Application Example 3 provides an organic electroluminescent device. The difference from the organic electroluminescent device provided in Application Example 1 is that the guest material in the light-emitting layer is complex 8 prepared in Example 1.

[0245] Test Example 2

[0246] The organic electroluminescent devices prepared in Application Example 1, Application Example 2, and Application Example 3 are tested. The results are shown in Table 2, the performance test results of the organic electroluminescent device:

[0247] Table 2

[0248]

[0249] CE, PE, EQE are the results at 1000 cd·m -2 below.

[0250] Table 2 shows the optical properties of the phosphorescent top-emitting devices prepared with complexes 2, 7, and 8. The peak wavelengths of the devices prepared in Application Examples 1-3 are 495 nm, 493 nm, and 495 nm respectively, and the full width at half maximum is 22 nm for all of them. Among the devices prepared in Application Examples 1-3, the highest power efficiency (PE) is 36.8 lm·W-1, the highest current efficiency (CE) is 45.0 cd·A-1, and the highest external quantum efficiency (EQE) reaches 26.1%, belonging to high-efficiency light-emitting devices.

[0251] Figure 12 is the electroluminescence spectrum of the organic photogeneration device with complex 2 prepared in Example 1. The abscissa is the wavelength and the ordinate is the normalized intensity. The emission spectrum shows a double-emission state. The maximum emission wavelength is 495 nm and the full width at half maximum is 22 nm. The spectrum is exactly in the edge region of blue and green light, showing a very good blue-green light effect.

[0252] Figure 13 is the device lifetime test chart of the OLED device prepared with complex 2 as the blue-green light doping material at room temperature under 20 mA / cm2 using an optoelectronic test system. The test results show that the decay lifetime LT95 of the prepared light-emitting device from 6733 cd / m 2 brightness is as high as 10.7 hours. This material and device structure can be further optimized to meet the requirements of high efficiency and stable light emission.

[0253] Figure 14 are the color coordinates of the emission spectra of the OLED top-emitting devices prepared with complex 2 as the doping material at room temperature. The CIE coordinate values of the devices with complexes 2 and 7 are (0.086, 0.518) and (0.085, 0.481) respectively, which are close to the blue-green light with relatively high monochromatic purity.

[0254] The present invention illustrates by way of examples that the complex having the structure shown in formula (I) can be used as a blue-green phosphorescent doping material, and single-doped blue-green phosphorescent devices and white phosphorescent devices can be prepared, wherein each material is not limited to the example structure; based on the application, the device structure can be either a bottom-emitting device or a top-emitting device. The ETL layer and the HTL may also contain one or more transport layer materials, and there may be another charge injection layer near the platinum complex and the electrode. The materials of the injection layer may include EIL (electron injection layer), HIL (hole injection layer) and CPL (cathode capping layer), and its form may be a single layer or dispersed in an electron or hole transport material. The host material may be any suitable host material known in the art. The emission color of the OLED is determined by the emission energy (optical bandgap) of the EML (emission layer) material, and the emission energy (optical bandgap) of the emission layer material can be tuned by tuning the electronic structure of the emitting platinum complex and / or the host material as described above. The hole transport material in the HTL layer and the electron transport material in the ETL layer may include any suitable hole transport body known in the art. The platinum complex provided by the embodiments of the present invention can exhibit phosphorescence. Phosphorescent OLEDs (i.e., OLEDs having phosphorescent emitters) generally have higher device efficiency than other OLEDs such as fluorescent OLEDs.

[0255] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A platinum complex, characterized in that, The platinum complex has the structure shown in formula (I): Among them, R0 is selected from one or more of substituted or unsubstituted C1-C 30 alkyl, substituted or unsubstituted C3-C 30 cycloalkyl, and substituted or unsubstituted C6-C 30 aryl; and / or, R1-R 15 are the same or different and each independently selected from a hydrogen atom and its isotope atoms, a halogen, a substituted or unsubstituted C1-C 30 alkyl group, a substituted or unsubstituted C3-C 30 cycloalkyl group, a substituted or unsubstituted C6-C 30 aryl group, and one or more of a substituted or unsubstituted C3-C 30 cycloalkenyl group; Among them, the hydrogen atoms in the alkyl group, cycloalkyl group, aryl group or cycloalkenyl group include their isotope atoms.

2. The platinum complex according to claim 1, wherein, R0 is independently selected from among deuterated groups -CDH2, -CD2H, -CD3, -CDR b R c , -CD2R d or more of the above, where R b , R c and R d are the same or different and are each independently selected from among substituted or unsubstituted C1-C 29 alkyl, substituted or unsubstituted C6-C 29 aryl, substituted or unsubstituted C3-C 29 cycloalkyl, substituted or unsubstituted C3-C 29 cycloalkenyl, or one or more of the above.

3. The platinum complex according to claim 1, wherein, R1-R 15 Same or different, each independently selected from deuterium, -CDH2, -CD2H, -CD3, -CDR b R c , -CD2R d or one or more of the following, wherein R b , R c and R d are the same or different and each independently selected from substituted or unsubstituted C1-C 29 alkyl, substituted or unsubstituted C6-C 29 aryl, substituted or unsubstituted C3-C 29 cycloalkyl, substituted or unsubstituted C3-C 29 cycloalkenyl.

4. The platinum complex according to claim 2 or 3, wherein The alkyl group replacing C1-C 29 is a C1-C 29 silyl group; and / or, the aryl group replacing C6-C 29 is a heteroaryl group of C6-C 29 .

5. The platinum complex according to any one of claims 1-4, wherein, The halogen is selected from one or more of fluorine, chlorine and bromine; And / or, the isotope atom is a deuterium atom and / or a tritium atom; and / or, the alkyl group is a C1-C 24 alkyl group, preferably, the alkyl group is selected from one or more of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl; And / or, the aryl group is selected from one or more of phenyl, naphthyl and biphenyl; And / or, the cycloalkyl group is selected from one or more of cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.

6. The platinum complex according to any one of claims 1-4, wherein, R0 and R1-R 15 are the same or different and each independently selected from one or more of methyl, deuterated methyl, benzyl, diphenylmethyl, triphenylmethyl, ethyl, 2-phenylethyl, 2,2-phenylethyl, 2,2,2-trifluoroethyl, propyl, isopropyl, 3,3,3-trifluoropropyl, 1,1,1,3,3,3-hexafluoro-2-propyl, butyl, isobutyl, hexafluoroisobutyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, phenyl, 2-methylphenyl, 2-isopropylphenyl, 2-ethylphenyl, 4-methylphenyl, 4-isopropylphenyl, 4-ethylphenyl, 4-tert-butylphenyl, 2,3-dimethylphenyl, 2,3-diethylphenyl, 2,3-diisopropylphenyl, 2,3-diisobutylphenyl, 2,3-dicyclohexylphenyl, 2,3-dicyclopropylphenyl, 2,3-dicyclobutylphenyl, 2,3-dicyclopentylphenyl, 2,4-dimethylphenyl, 2,4-diethylphenyl, 2,4-diisopropylphenyl, 2,4-diisobutylphenyl, 2,4-dicyclohexylphenyl, 2,4-dicyclopropylphenyl, 2,4-dicyclobutylphenyl, 2,4-dicyclopentylphenyl, 2,6-dimethylphenyl, 2,6-diethylphenyl, 2,6-diisopropylphenyl, 2,6-diisobutylphenyl, 2,6-dicyclohexylphenyl, 2,6-dicyclopropylphenyl, 2,6-dicyclobutylphenyl, 2,6-dicyclopentylphenyl, 3,5-dimethylphenyl, 3,5-diethylphenyl, 3,5-diisopropylphenyl, 3,5-diisobutylphenyl, 3,5-dicyclohexylphenyl, 3,5-dicyclopropylphenyl, 3,5-dicyclobutylphenyl, 3,5-dicyclopentylphenyl, 2,3,5,6-tetramethylphenyl, 2,4,6-trimethylphenyl, 2,4,6-triethylphenyl, 2,4,6-triisopropylphenyl, 2,4,6-triisobutylphenyl, 2,4,6-tricyclohexylphenyl, 2,4,6-tricyclopropylphenyl, 2,4,6-tricyclobutylphenyl and 2,4,6-tricyclopentylphenyl.

7. The platinum complex according to any one of claims 1-6, wherein, The platinum complex is selected from at least one of the following complexes 1-15:

8. A method for preparing a platinum complex, characterized in that, The described preparation method includes: (1) Coupling the compound A shown in formula (a), the compound F1 shown in formula (b) and the compound F2 shown in formula (c) to obtain the intermediate C shown in formula (d); Among them, X1 and X2 are the same or different, each being H or a halogen, and not both being H at the same time; (2) Performing an imidazole cyclization reaction on the intermediate C shown in formula (d) and the compound F3 shown in formula (e) to obtain the ligand precursor D shown in formula (f); NH4 + Y - (EtO)3CH, formula (e); wherein, Y - is an anion; (3) Performing a cyclometalation reaction on the ligand precursor D shown in formula (f) and a platinum salt to obtain the platinum complex shown in formula (I); Among them, R0, R1-R in formula (a), formula (b), formula (c), formula (d), formula (e), formula (f) and formula (I) 15 are the same as those defined in any one of claims 1-7.

9. According to the preparation method described in claim 8, wherein, X is selected from one or more of iodine, bromine, chlorine and fluorine; and / or, Y - selected from one or more of trifluoromethanesulfonate, tetrafluoroborate, hexafluorophosphate, and trifluoroacetate.

10. The preparation method according to claim 8 or 9, wherein In the coupling reaction, it also includes being carried out in the presence of BINAP, tris(dibenzylideneacetone)dipalladium, sodium tert-butoxide and toluene; Preferably, in step (1), the described preparation method includes: first coupling the compound F1 shown in formula (b) and the compound F2 shown in formula (c) to obtain the compound F4 shown in formula (g); Among them, R1, R2, R3, R4, R0 and X in the compound F4 shown in formula (g) have the same definitions as those described in any one of claims 1-9; Preferably, relative to 4-5 mL of toluene, the molar amount of the compound F1 shown in formula (b) is 0.5-2 mmol, and the molar amount of the compound F2 shown in formula (c) is 0.5-5 mmol; More preferably, relative to 4-5 mL of toluene, the molar amount of the compound A shown in formula (a) is 0.5-2 mmol, the molar amount of the compound F4 shown in formula (g) is 0.5-5 mmol, the molar amount of BINAP is 0.01-0.5 mmol, the molar amount of tris(dibenzylideneacetone)dipalladium is 0.01-0.5 mmol, and the molar amount of sodium tert-butoxide is 0.5-3 mmol; And / or, the conditions of the coupling reaction include: under a N2 atmosphere, at a temperature of 60-100 °C, stirring for 6-24 h.

11. The preparation method according to claim 8 or 9, wherein In the imidazole cyclization reaction, it also includes being carried out in the presence of ammonium hexafluorophosphate and triethylamine; Preferably, relative to 2 mL of triethylamine, the molar amount of the intermediate C shown in formula (d) is 0.5-2 mmol, and the molar amount of ammonium hexafluorophosphate is 0.5-2 mmol; And / or, the conditions of the imidazole cyclization reaction include: under a N2 atmosphere, at a temperature of 120-130 °C, stirring for 12-72 h.

12. The preparation method according to claim 8 or 9, wherein In the cyclometalation reaction, it also includes being carried out in the presence of N,N-dimethylformamide; and / or, the platinum salt is platinum dichloride; and / or, relative to 100 mL of N,N-dimethylformamide, the molar amount of the ligand precursor D shown in formula (f) used is 0.5 - 4 mmol, and the molar amount of the platinum salt used is 0.5 - 4 mmol; and / or, the conditions of the cyclometalation reaction include: under a nitrogen atmosphere, stirring at a temperature of 30 - 100 °C for 12 - 72 h and then heating to 80 - 200 °C and stirring for 12 - 72 h.

13. A platinum complex prepared by the preparation method according to any one of claims 8 - 12.

14. Use of the platinum complex according to any one of claims 1 - 7 and 13 in an organic optoelectronic device.

15. Use of the platinum complex according to any one of claims 1 - 7 and 13 in a display device and / or a lighting device.

16. An organic optoelectronic device, characterized in that, The organic optoelectronic device includes a positive electrode, a negative electrode, and an organic layer disposed between the positive electrode and the negative electrode, the organic layer includes a light-emitting layer, and the light-emitting layer includes the platinum complex according to any one of claims 1 - 7 and 13.

17. The organic optoelectronic device according to claim 16, wherein, The organic optoelectronic device is a blue-green light organic optoelectronic device.

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