CN112898327B - An organic metal complex and an organic photoelectric element containing the same - Google Patents

Abstract

The invention provides an organic metal complex and an organic photoelectric element comprising the same, in particular an organic electroluminescent diode, wherein the structure of the organic metal complex is shown as a formula I: M is selected from one of nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb), and the detailed information can be understood from the detailed description provided herein. The organometallic compound can obtain a blue or blue-green OLED device with high efficiency and long service life, and shows the potential application of the organometallic complex in blue or blue-green OLED. Meanwhile, metals such as nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb) are low in price, the crust is rich in content, and the metal-organic metal complex has the potential of replacing noble metal organic metal complexes such as platinum, iridium and palladium, and has good commercial application prospect.

Description

Organometallic complex and organic photoelectric element containing the same

Technical Field

The invention belongs to the field of organic photoelectricity, and particularly relates to an organic metal complex and an organic photoelectric element comprising the same, in particular to an organic electroluminescent diode.

Background

The organic light-emitting diode (OLED) is used as a novel display technology, has the unique advantages of self-luminescence, wide visual angle, low energy consumption, high efficiency, thinness, rich colors, high response speed, wide applicable temperature range, low driving voltage, flexible and bendable transparent display panel manufacturing, environment friendliness and the like, can be applied to flat panel displays and new-generation illumination, and can also be used as a backlight source of an LCD.

OLED luminescence is classified into fluorescence luminescence and phosphorescence luminescence, and it is theoretically assumed that the ratio of singlet excited states to triplet excited states due to charge binding is 1:3. In 1998, professor Baldo and Forrest et al found that triplet phosphorescence can be utilized at room temperature, and the upper limit of the original internal quantum efficiency is raised to 100%, and triplet phosphors are often heavy metal atoms and form complexes, and by utilizing the heavy atom effect, strong spin-orbit coupling effect causes the energy levels of a singlet excited state and a triplet excited state to be mixed with each other, so that the triplet energy which is originally forbidden is relieved to emit light in a phosphorescence form, and the quantum efficiency is also greatly raised.

The light-emitting layer in the OLED device almost entirely uses a host-guest light-emitting system mechanism, i.e., a guest light-emitting material is doped in a host material, and generally, the energy of an organic host material is larger than that of the guest material, i.e., energy is transferred from the host to the guest, so that the guest material is excited to emit light. Commonly used phosphorescent organic host materials such as CBP (4, 4' -bis (carbazol-9-yl) biphenyl) have high efficiency and high triplet energy levels, and when used as an organic material, triplet energy can be efficiently transferred from a light emitting organic material to a guest phosphorescent light emitting material. The common organic guest material is iridium metal compound, so that the application of iridium metal compound to commercial OLED materials is mainstream at present, but iridium metal is quite expensive and has a rare content in crust, an organic metal complex needs to be researched to replace the expensive iridium metal complex, an alternative scheme of OLED luminescent materials is expanded, and the possibility is provided for sustainable development.

The invention discovers that the organic metal compound (nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb)) can improve the luminous efficiency of the organic metal compound by introducing a specific annular structure, substituent groups and the like, ensure the high-efficiency luminous characteristic of the organic metal compound, and can obtain high current efficiency and reduce the operating voltage of components when being applied to organic photoelectric elements, particularly organic electroluminescent devices.

Disclosure of Invention

The invention aims to provide an organic metal complex and an optoelectronic device comprising the same, in particular an organic electroluminescent diode.

The structure of the organometallic complex provided by the invention is shown as a formula I:

Wherein M is selected from one of nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb); X1 to X13 are CR5 or N; Y is N, CR, siR5 or B, L2 is independently selected from one of O, S, NR, CR1R2, siR1R2, O=P-R1 or B-R1, L3 is absent or independently selected from one of single bond, O, S, NR1, CR1R2, siR1R2, O=P-R1 or B-R1, R1 to R5 are independently selected from hydrogen, deuterium, CN, halogen, C1-C60 alkyl, C1-C60 alkoxy, C1-C60 alkyl-silicon-containing, C1-C60 alkoxy-containing, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C1-C60 heteroaryl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl ether, substituted or unsubstituted heteroaryl ether, substituted or unsubstituted arylamine, substituted or unsubstituted heteroarylamine, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, oxygen-substituted or unsubstituted aryl, and X may be substituted or unsubstituted by at least one of 37 to 37R 1-C60 aryl, optionally substituted or unsubstituted aryl, and optionally substituted by one of the same moiety, X and R1-C14, optionally substituted or substituted by a fluoro-containing at least one of the substituents.

Preferably, the organometallic complex according to the invention has two atoms which are bonded to the metal M to form covalent bonds and two atoms to form coordination bonds, so that the organometallic complex is in a neutral state.

Preferably, the organometallic complexes according to the invention, formula I is selected from one of the following structures:

wherein X1 to X14, R1 to R5 are the same as described above, and adjacent R1 to R5 may form a ring.

Preferably, the organometallic complexes according to the invention, formula I is selected from one of the following structures:

Wherein R1 to R6 are the same as those described for R1 in the above, and when R1 to R6 are 2 or more, they may be the same or different, n is0, 1,2, 3 or 4, and adjacent R1 to R6 may form a ring.

Preferably, the organometallic complexes of the invention, of the formula IThe moieties are independently selected from one of the following representative groups, but are not meant to be limiting:

Wherein X15 to X18 are as defined for X1 above and R1 to R7 are as defined for R1 above.

Preferably, the organometallic complexes of the invention, any two of formula I are combined (bonded) together to form a fused ring system, which is benzimidazole, benzoxazole, benzothiazole, indazole, quinoline, isoquinoline, imidazo [1,5-a ] pyridine, and the like.

Preferably, the organometallic complex according to the invention, wherein R1 to R7 are selected from one of the following structures, but are not represented as such:

in the above structure, it may be partially deuterated or perdeuterated, and it may be partially fluorinated or perfluorinated.

Preferably, the organometallic complex according to the invention, the formula I is selected from one of the following representative structures, but is not meant to be limiting:

Preferably, the organometallic complexes according to the invention, the Ni in the formula I can be replaced by Cu, mn, pb, etc., but are not represented as such.

The present invention relates to an organometallic complex comprising a preparation of the compound of the formula (I) with one or more solvents, and the solvents used are not particularly limited, and unsaturated hydrocarbon solvents such as toluene, xylene, mesitylene, tetrahydronaphthalene, decalin, bicyclohexane, n-butylbenzene, sec-butylbenzene, tert-butylbenzene, halogenated saturated hydrocarbon solvents such as carbon tetrachloride, chloroform, methylene chloride, dichloroethane, chlorobutane, bromobutane, chloropentane, bromopentane, chlorohexane, bromohexane, chlorocyclohexane, bromocyclohexane, halogenated unsaturated hydrocarbon solvents such as chlorobenzene, dichlorobenzene, trichlorobenzene, ether solvents such as tetrahydrofuran, tetrahydropyran, and ester solvents such as alkyl benzoate, which are well known to those skilled in the art, may be used.

The invention also relates to an organic optoelectronic component,

Comprises a first electrode;

a second electrode facing the first electrode;

An organic functional layer sandwiched between the first electrode and the second electrode;

wherein the organic functional layer comprises the organometallic complex.

The organic photoelectric element is any one of an organic photovoltaic device, an Organic Light Emitting Device (OLED), an Organic Solar Cell (OSC), electronic paper (e-paper), an Organic Photoconductor (OPC), an Organic Thin Film Transistor (OTFT) and an organic memory device (Organic Memory Element), and an illumination and display device.

The invention also relates to an organic electroluminescent device, which comprises a cathode layer, an anode layer and an organic layer, wherein the organic layer comprises at least one layer of a hole injection layer, a hole transmission layer, a luminescent layer, a hole blocking layer, an electron injection layer and an electron transmission layer, and the luminescent layer of the device contains the organometallic complex.

The organic electroluminescent device luminescent layer contains the organic metal complex and a corresponding main material, wherein the mass percentage of the organic metal complex is 0.1% -50%.

In the present invention, the organic photoelectric device is prepared by vapor-depositing a metal or an oxide having conductivity and an alloy thereof on a substrate by a sputtering method, an electron beam evaporation method, a vacuum vapor deposition method, or the like to form an anode, vapor-depositing a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer in this order on the surface of the prepared anode, and then vapor-depositing a cathode. The organic electronic device is manufactured by evaporating the cathode, the organic layer and the anode on the substrate except the method. The organic layer may have a multilayer structure including a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and the like. The organic layer is prepared by adopting a macromolecular material to replace an evaporation method by solvent engineering (spin-coating), tape-casting, doctor-blading (doctor-blading), screen-Printing, ink-jet Printing or Thermal Imaging (Thermal-Imaging) and the like, so that the number of device layers can be reduced.

The materials used for the organic electroluminescent device according to the present invention may be classified as top emission, low emission or double-sided emission. The organic electroluminescent device compound according to the embodiment of the present invention can be applied to organic solar cells, illuminated OLEDs, flexible OLEDs, organic photoreceptors, organic thin film transistors, and other electroluminescent devices in a similar principle as organic light emitting devices.

The invention has the beneficial effects that:

The invention relates to a novel organic metal complex, which has high luminous efficiency, a proper ligand structure can promote energy transmission between a host and an object, and the organic metal complex is particularly used as a functional layer, and particularly used as an organic electroluminescent device manufactured by a luminous layer, and has high current efficiency and long operation life. After the majority of electrons and holes are combined, the energy is effectively transferred to the organometallic complex for light emission, and a brand new organometallic complex with excellent light emitting performance and application thereof are provided.

Drawings

FIG. 1 is a layer diagram of an organic optoelectronic device according to the present invention.

Wherein 110 represents a substrate, 120 represents an anode, 130 represents a hole injection layer, 140 represents a hole transport layer, 150 represents a light emitting layer or an active layer, 160 represents a hole blocking layer, 170 represents an electron transport layer, 180 represents an electron injection layer, and 190 represents a cathode.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In a preferred embodiment of the present invention, the OLED device of the present invention comprises a hole transporting layer, and the hole transporting material may preferably be selected from known or unknown materials, particularly preferably from the following structures, but does not represent the present invention limited to the following structures:

In a preferred embodiment of the present invention, the hole transport layer comprised in the OLED device of the present invention comprises one or more p-type dopants. The preferred p-type dopants of the present invention are of the following structure, but are not meant to limit the invention to the following structure:

In a preferred embodiment of the present invention, the electron transport layer may be selected from at least one of the compounds ET-1 to ET-13, but does not represent the present invention limited to the following structures:

The electron transport layer may be formed of an organic material in combination with one or more n-type dopants (e.g., liQ).

The present invention also provides a preparation comprising the organometallic complex and a solvent, and the solvent used is not particularly limited, and examples thereof include unsaturated hydrocarbon solvents such as toluene, xylene, mesitylene, tetrahydronaphthalene, decalin, bicyclohexane, n-butylbenzene, sec-butylbenzene, tert-butylbenzene, halogenated saturated hydrocarbon solvents such as carbon tetrachloride, chloroform, methylene chloride, dichloroethane, chlorobutane, bromobutane, chloropentane, chlorohexane, bromohexane, chlorocyclohexane, bromocyclohexane, halogenated unsaturated hydrocarbon solvents such as chlorobenzene, dichlorobenzene, trichlorobenzene, ether solvents such as tetrahydrofuran and tetrahydropyran, and ester solvents such as alkyl benzoate, which are known to those skilled in the art. The preparation is directly used for preparing photoelectric devices.

In the following, according to the prior art reserves of the literature and of the inventors, the synthesis procedure of the organometallic complexes according to formula I is as follows:

EXAMPLE 1 Synthesis of Compound 1

(1) After S-1 (10 mmol) and S-2 (11 mmol) were completely dissolved in xylene (80 ml) in a round bottom flask under nitrogen atmosphere, potassium tert-butoxide (5 g), palladium acetate (0.1 g), tri-tert-butylphosphine (0.2 g) were added thereto, and the mixture was heated under reflux for 5 to 10 hours. After cooling to room temperature, the salt is removed by filtration through celite, the solvent is concentrated in vacuo, and then purified and separated on a silica gel column using petroleum ether: dichloromethane (20:1-2:1) as eluent to give S-3 (5.8 g, 85% yield), LC-MS,684.3,686.3.

(2) S-3 (10 mmol), imidazole (15 mmol), cuprous oxide (1.4 g), cis-2-pyridine oxime (2.4 g) and acetonitrile (200 ml) were thoroughly mixed in a round bottom flask, and after bubbling to remove oxygen, the reaction was refluxed under nitrogen atmosphere for 48 hours. After the reaction was completed, the reaction mixture was cooled to room temperature, and inorganic salts were removed by filtration through celite, and the mixture was washed with methylene chloride. Adding water into the filtrate, extracting with dichloromethane, combining dichloromethane layers, drying, and purifying and separating on a silica gel column by using petroleum ether and ethyl acetate (20:1-2:1) as eluent to obtain S-4 with the yield of 73%. LC-MS 672.3.

(3) S-4 (10 mmol) was dissolved in toluene (60 ml) in a round bottom flask under nitrogen atmosphere and methyl iodide (30 mmol) was added and the mixture was stirred at room temperature for 48 hours. The solid was filtered, washed successively with cold toluene (20 ml), diethyl ether (20 ml) and dried to give S-5 as a pale yellow solid in 88% yield. LC-MS 687.4.

(4) S-5 (5 mmol) and silver oxide (2.52 mmol) were reacted in dichloromethane (50 ml) under nitrogen atmosphere for 24 hours, after removing dichloromethane under reduced pressure, nickel dichloride (5.1 mmol) and chlorobenzene (50 ml) were added, heated and refluxed for 72 hours, cooled to room temperature, concentrated and dried to obtain pale yellow solid, and purified and separated on silica gel column using petroleum ether dichloromethane (20:1-2:1) as eluent to obtain compound 1 (yield 82%) and further purified by vacuum sublimation. LC-MS: theory 742.32, found 742.3, elemental analysis C:75.91, H:6.51, N:7.53, found C:75.88, H:6.55, N:7.54.

EXAMPLE 2 Synthesis of Compound 2

The synthesis procedure for compound 2 was similar to that for compound 1, with a final yield of 73% of nickel complex formed, LC-MS: theory 923.44, found 923.4, elemental analysis C:79.22, H:6.87, N:7.57, found C:79.20, H:6.90, N:7.55.

EXAMPLE 3 Synthesis of Compound 3

The synthesis procedure for compound 3 was similar to that for compound 1, with a final nickel complex formation yield of 71%, LC-MS: theory 890.43, found 890.4, elemental analysis C:76.76, H:7.23, N:6.28, found C:76.73, H:7.25, N:6.25.

EXAMPLE 4 Synthesis of Compound 4

The synthesis procedure for compound 4 was similar to that for compound 1, with a final nickel complex formation yield of 76%, LC-MS: theory 874.45, found 874.4, elemental analysis C:79.54, H:7.37, N:6.40, found C:79.56, H:7.34, N:6.36.

EXAMPLE 5 Synthesis of Compound 5

The synthesis procedure for compound 5 was similar to that for compound 1, with a final nickel complex formation yield of 70%, LC-MS: theory 861.43, found 861.4, elemental analysis C:77.95, H:7.13, N:8.12, found C:77.92, H:7.15, N:8.09.

EXAMPLE 6 Synthesis of Compound 6

The synthesis procedure for compound 6 was similar to that for compound 1, with a final nickel complex formation yield of 65%, LC-MS: theory 771.32, found 771.3, elemental analysis C:74.61, H:6.65, N:5.44, found C:74.60, H:6.70, N:5.40.

EXAMPLE 7 Synthesis of Compound 7

(1) Compound S-1 (10 mmol) was dissolved in tetrahydrofuran (60 ml) in round bottom flask 1, cooled to-77℃with an acetone-dry ice bath, compound S-2 (10 mmol) was dissolved in tetrahydrofuran (20 ml) in round bottom flask 2, cooled to-77℃with an acetone-dry ice bath, and n-butyllithium (2.5M solution) (4 ml) was added dropwise thereto for reaction for 5 hours under a nitrogen atmosphere. The mixture in round-bottomed flask 2 was added dropwise to round-bottomed flask 1, and the reaction temperature was kept at-77℃for 1 hour. After slowly warming the mixture in round bottom flask 1 to room temperature, the reaction was continued for 6 hours. After quenching the reaction with saturated aqueous ammonium chloride, the organic phase was separated. Extracting the water phase with ethyl acetate, combining the organic phases, concentrating, and purifying and separating on a silica gel column by using petroleum ether and ethyl acetate (20:1-2:1) as eluent to obtain a compound S-2A (yield 76%); LC-MS:715.3,717.3.

(2) Compound S-2A (10 mmol) was dissolved in acetic acid (100 ml), 2 ml of concentrated sulfuric acid was added dropwise, and the mixture was heated under reflux for 12 hours. After concentrating and cooling, the mixture was poured into ice water, and extracted with methylene chloride (50 ml. Times.2). The dichloromethane layer is washed by saturated saline water and sodium bicarbonate water solution, concentrated to dryness, and crude products are purified and separated on a silica gel column by using petroleum ether and dichloromethane (20:1-2:1) as eluent to obtain a compound S-3 (the yield is 73 percent), and LC-MS is 697.3,699.3.

(3) The remaining synthetic steps are analogous to compound 1, with a final yield of 68% for compound 7, LC-MS: theory 861.42, found: 861.4, elemental analysis C:79.35, H:7.13, N:4.87, found: C:79.31, H:7.20, N:4.90.

EXAMPLE 8 Synthesis of Compound 8

The synthesis procedure for compound 8 was similar to that for compound 7, resulting in a yield of 63% for compound 8, LC-MS: theory 890.43, found 890.4, elemental analysis C:76.76, H:7.23, N:6.28, found C:76.78, H:7.27, N:6.25.

EXAMPLE 9 Synthesis of Compound 9

The synthesis procedure for compound 9 was similar to that for compound 7, with a final yield of 74% for compound 9, LC-MS: theory 845.40, found 845.4, elemental analysis C:78.03, H:6.91, N:4.96, found C:78.06, H:6.98, N:5.00.

EXAMPLE 10 Synthesis of Compound 10

The synthesis procedure for compound 10 was similar to that for compound 1, resulting in a yield of 62% for compound 10, LC-MS: theory 892.36, found 892.4, elemental analysis C:63.28, H:5.42, N:6.28, found C:63.31, H:5.46, N:6.30.

EXAMPLE 11 Synthesis of Compound 11

The synthesis procedure for compound 11 was analogous to that for compound 7, with a final yield of 71% for compound 9, LC-MS: theory 850.40, found 850.4, elemental analysis C:77.59, H:6.87, N:4.94, found C:77.64, H:6.93, N:5.00.

EXAMPLE 12 Synthesis of Compound 12

The synthesis procedure for compound 12 was similar to that for compound 7, with a final yield of 65% for compound 9, LC-MS: theory 842.41, found 842.4, elemental analysis C:78.38, H:6.94, N:4.99, found C:78.36, H:6.98, N:5.03. The OLED general preparation method comprises the following steps:

Evaporating P-doped material P-1~P on the surface or anode of ITO glass with the size of 2mm×2mm, or co-evaporating the P-doped material with the compound in the table at a concentration of 1% -50% to form a Hole Injection Layer (HIL) of 5-100nm, a Hole Transport Layer (HTL) of 5-200nm, then forming a light emitting layer (EML) of 10-100nm (which may contain the compound) on the hole transport layer, finally forming an Electron Transport Layer (ETL) of 20-200nm and a cathode of 50-200nm with the compound in sequence, adding an Electron Blocking Layer (EBL) between the HTL and the EML layer if necessary, and adding an Electron Injection Layer (EIL) between the ETL and the cathode to manufacture the organic light emitting element.

OLED device embodiments:

The structure of the bottom-emitting OLED device was embodied as HT-1:P-3 (95:5 v/v%) with a thickness of 10nm, HTL HT-1 with a thickness of 90 nm, EBL HT-10 with a thickness of 10nm, EML BH-1: organometallic compound (95:5 v/v%), thickness of 35 nm, ETL ET-13:LiQ (50:50 v/v%), thickness of 35 nm, and then evaporation cathode Al of 70 nm on ITO-containing glass.

According to the above device embodiments, the External Quantum Efficiency (EQE), the turn-on voltage, the emission peak, and the like characteristics of the OLED device are shown in table 1 below.

TABLE 1

Examples	Compounds of formula (I)	Lighting voltage (V)	EQE	Luminescence peak (nanometer)	LT90 (hours)
						Contrast device	Ref-1	3.6	15.8%	523	36
Device example 1	Compound 1	3.5	17.4%	468	35
						Device example 2	Compound 2	3.4	18.6%	469	86
Device example 3	Compound 3	3.6	21.5%	465	110
						Device example 4	Compound 4	3.5	21.4%	463	125
Device example 5	Compound 5	3.6	16.4%	464	76
						Device example 6	Compound 6	3.6	14.7%	461	48
Device example 7	Compound 7	3.5	22.1%	456	135
						Device example 8	Compound 8	3.4	21.8%	460	142
Device example 9	Compound 9	3.6	17.2%	455	95
						Device example 10	Compound 10	4.2	11.2%	473	26
Device example 11	Compound 11	3.8	18.2%	473	58
						Device example 12	Compound 12	3.8	13.2%	463	79

The invention uses novel ligands blocked by carbon, silicon, boron, nitrogen and the like, and introduces a ligand structure with shorter conjugated chain to obtain novel organometallic complex. The substituted imidazolylaryl forms complexes with metals that determine the HOMO, LUMO and lowest triplet energy levels of the organometallic complexes of the present invention, and thus the spectral position of the excited state radiation thereof. According to the invention, nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb) metals are introduced into the organic light-emitting diode, and the organic light-emitting diode has good light-emitting characteristics, and is used as a guest material to be doped into a host material BH-1, so that an OLED device with external quantum efficiency of 11.2-22.1% is obtained. In a bottom-emitting OLED device without any light extraction means, the external quantum efficiency is close to 20%, indicating that the organometallic complexes according to the invention have an internal quantum efficiency of 100% in the OLED device. Meanwhile, the service life LT90 of the device is up to 142 hours, which shows that the organic metal compound can be used for obtaining a blue or blue-green phosphorescent OLED device with long service life, and the potential application of the organic metal complex in blue or blue-green OLED is shown. Meanwhile, metals such as nickel (Ni), copper (Cu), cobalt (Co), manganese (Mn) or lead (Pb) are low in price, the crust is rich in content, and the metal-organic metal complex has the potential of replacing noble metal organic metal complexes such as platinum, iridium and palladium, and has good commercial application prospect.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (7)

1. An organometallic complex characterized in that the structure of the organometallic complex is as shown in the following compound:

。

2. a formulation comprising the organometallic complex of claim 1 and at least one solvent.

3. A formulation according to claim 2, characterized in that the organometallic complex and the solvent form a formulation, the solvent being selected from toluene, xylene, mesitylene, tetrahydronaphthalene, decalin, bicyclohexane, n-butylbenzene, sec-butylbenzene, tert-butylbenzene, carbon tetrachloride, chloroform, methylene chloride, dichloroethane, chlorobutane, bromobutane, chloropentane, bromopentane, chlorohexane, bromohexane, chlorocyclohexane, bromocyclohexane, chlorobenzene, dichlorobenzene, trichlorobenzene, tetrahydrofuran, tetrahydropyran or alkyl benzoate.

4. An organic electroluminescent device, comprising:

A first electrode;

a second electrode facing the first electrode;

An organic functional layer sandwiched between the first electrode and the second electrode;

Wherein the organic functional layer comprises the organometallic complex according to claim 1.

5. An organic electroluminescent device comprises a cathode layer, an anode layer and an organic layer, wherein the organic layer comprises at least one layer of a hole injection layer, a hole transport layer, a light emitting layer, an electron injection layer and an electron transport layer, and the organic electroluminescent device is characterized in that any one layer of the device contains the organic metal complex as claimed in claim 1.

6. The organic electroluminescent device according to claim 5, wherein the luminescent layer comprises the organometallic complex and a corresponding host material, wherein the mass percentage of the organometallic complex is 1% to 50%.

7. A display or lighting device, characterized in that it comprises an organic electroluminescent device according to any one of claims 4 to 6.