CN111278836A - A metal-organic complex and its application in organic electronic devices - Google Patents

Abstract

The invention discloses a novel organometallic complex and its application in organic electronic devices, especially in organic phosphorescence light-emitting diodes. The invention also relates to organic electronic devices, in particular organic light-emitting diodes, comprising the metal-organic complexes according to the invention, and their use in display and lighting technology. By optimizing the device structure and changing the concentration of metal complexes in the matrix, the best device performance can be achieved, which facilitates the realization of high-efficiency, high-brightness and high-stable OLED devices, and provides better material options for full-color display and lighting applications.

Description

Metal organic complex and application thereof in organic electronic device

The present application claims priority from chinese patent application entitled "a metal organic complex and its use in organic electronic devices" filed by the chinese patent office on 12, 14/2017 with application number 201711342792.0, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to novel metal-organic complexes, mixtures and compositions comprising them, and their use in organic electronic devices, in particular in organic phosphorescent light-emitting diodes. The invention also relates to an organic electronic component, in particular a light-emitting diode, comprising such a metal-organic complex, and to the use thereof in displays and lighting devices.

Background

Organic Light Emitting Diodes (OLEDs) have the advantages of low cost, light weight, low operating voltage, high brightness, color tunability, wide viewing angle, easy assembly onto flexible substrates, and low energy consumption in flat panel display and lighting applications, and thus are the most promising display technologies. In order to improve the light emitting efficiency of the organic light emitting diode, various fluorescent and phosphorescent based light emitting material systems have been developed. Organic light emitting diodes using fluorescent materials have high reliability, but the internal electroluminescence quantum efficiency thereof under electric field excitation is limited to 25%. In contrast, since the branching ratio of the singlet excited state and the triplet excited state of the exciton is 1:3, the organic light emitting diode using the phosphorescent material can almost achieve 100% of internal emission quantum efficiency. For small molecule OLEDs, triplet excitation is efficiently obtained by doping with heavy metal centers, which improves spin-orbit coupling and thus intersystem crossing to the triplet state.

The complex based on the metallic iridium (III) is a material widely used for high-efficiency OLEDs, and has higher efficiency and stability. Baldo et al reported high quantum efficiency OLEDs using fac-tris (2-phenylpyridine) iridium (III) [ ir (ppy)3] as the phosphorescent light emitting material, 4,4 '-N, N' -dicarbazole-biphenyl (CBP) as the host material (appl. phys. lett.1999,75, 4). Another example of a phosphorescent light emitting material is the sky-blue complex iridium bis [2- (4 ', 6' -difluorophenyl) pyridine-N, C2] -picolinate (III) (FIrpic), which when doped into a high triplet energy host exhibits very high photoluminescence quantum efficiencies of approximately 60% in solution and almost 100% in solid films (appl. phys. lett.2001,79,2082). Although iridium (III) systems based on 2-phenylpyridine and derivatives thereof have been used in large amounts for the preparation of OLEDs, the content of phosphorescent light-emitting materials containing other metal centers with these ligands has remained largely unexplored.

Despite the increasing interest in phosphorescent light-emitting materials, in particular metal complexes with heavy metal centres, most efforts have been focused on the use of iridium (III), platinum (II), copper (I) and fetters (II). Other metal centers are of little concern. Unlike isoelectronic platinum (II) coordination compounds known to exhibit highly efficient gyrogenic properties, few examples of luminescent gold (III) complexes have been reported, which may result from the presence of a low energy d-d coordination field (LF) possessed by the gold (III) metal center and the electrophilicity of the gold (III) metal center. One way to increase the luminescence efficiency of gold (III) complexes is to introduce strong sigma-donor ligands, such as the stable gold (III) aryl compounds first discovered and synthesized by Yam et al, which exhibit interesting photoluminescence rotation properties even at room temperature (j. Another donor of interest is an alkynyl group. Although the gyrogenic optical properties of gold (I) alkynyl complexes have been extensively studied, the chemistry of gold (III) alkynyl has been largely ignored, with one exception: the synthesis of alkynyl gold (III) compounds of 6 benzyl-2, 2' -bipyridine (j.chem.soc.dalton trans.1999,2823), but their gyrogenic activity has not been studied. Yam et al disclose the synthesis of a series of bis-cyclometallated alkynyl gold (III) compounds using various strong sigma-donor alkynyl ligands, all of which exhibit strong luminescent properties in various media at room temperature and low temperature (j.am. chem. soc.2007,129, 4350). Furthermore, OLEDs prepared with these luminescent gold (III) compounds as phosphorescent dopant materials have an external quantum efficiency of up to 5.5%. These luminescent gold (III) compounds contain a tridentate ligand and at least one strong sigma-donor group coordinated to the gold (III) metal centre. Thereafter, Yam et al successively reported a new class of phosphorescent materials (j.am. chem. soc.2010,132, 14273) of metallated alkynyl gold (III) complexes. The optimized evaporation type OLED achieves the EQE of 11.5% and the current efficiency of 37.4cd A-1. This indicates that the alkynyl gold (III) complexes are promising luminescent materials. However, the stability of the compound needs to be improved.

In order to increase the stability of the gold (III) complexes, one approach is to modify the monodentate alkynyl ligand with a monoanionic bidentate chelating ligand. However, such complexes have not been developed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the stability of the metal-organic complex material needs to be improved, and the present invention aims to provide a kind of metal-organic complex luminescent material with simple synthesis, novel structure and better stability, especially to obtain a more stable gold (III) complex by replacing the conventional monodentate ligand with a bidentate chelating ligand. More preferably, the luminous efficiency is higher due to the shortened molecular bonds, increased molecular rigidity, reduced non-radiative transitions.

The technical scheme provided by the invention is as follows: a transition metal complex has a general structural formula shown in chemical formula (1):

chemical formula (1)

The symbols and indices used therein have the following meanings:

m is a metal atom selected from gold, platinum or palladium;

L¹each occurrence, which may be the same or different, is a ligand comprising O ^ X, X is selected from O or N; preferably selected from bidentate chelating ligands, preferably monoanionic bidentate chelating ligands;

Ar¹at each occurrence, identical or different, is an aromatic, heteroaromatic or nonaromatic ring system having 5 to 20 ring atoms which may be interrupted by one or more radicals R¹Substituted, said radical R¹May be the same or different in multiple occurrences;

Ar²at each occurrence, identical or different, is an aromatic, heteroaromatic or nonaromatic ring system having 5 to 20 ring atoms which may be interrupted by one or more radicals R²Substituted, said radical R²May be the same or different in multiple occurrences;

R¹，R²in the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 30 carbon atoms.

The transition metal complex can be used as a guest material of a light-emitting layer in a phosphorescent organic light-emitting diode device.

A polymer comprising a transition metal complex as described above as repeating units.

A mixture comprising a metal organic complex or polymer as described above and at least one further organic functional material. The other organic functional material may be selected from a Hole Injection Material (HIM), a Hole Transport Material (HTM), an Electron Transport Material (ETM), an Electron Injection Material (EIM), an Electron Blocking Material (EBM), a Hole Blocking Material (HBM), a light emitting material (Emitter), a Host material (Host), or a Dopant material (Dopant).

An organic electronic device comprising a metal-organic complex or polymer according to the invention.

The Organic electronic device can be selected from an Organic Light Emitting Diode (OLED), an Organic photovoltaic cell (OPV), an Organic light Emitting cell (OLEEC), an Organic Field Effect Transistor (OFET), an Organic light Emitting field effect transistor (OFET), an Organic laser, an Organic spinning electronic device, an Organic sensor and an Organic Plasmon Emitting Diode (Organic plasma Emitting Diode).

Has the advantages that: the metal organic complex is used in OLED, especially as the doping material of the luminous layer, and can provide higher luminous efficiency and device life. The possible reason for this is that such structurally novel organometallic complexes replace the conventional monodentate ligands with bidentate ligands. Compared with monodentate ligands, the ligand increases the rigidity of molecules, so that the whole complex has better chemical, optical, electrical and thermal stability. Meanwhile, because the modification is carried out on the auxiliary ligand, the influence on the wavelength of the maximum peak of the luminescence caused by the main ligand is low, and the saturated luminescence color can be reserved.

Detailed Description

The invention provides a novel metal organic complex, a corresponding mixture and a composition, and application in an organic electronic device, and the invention is further detailed below in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the present invention, the composition and the printing ink, or ink, have the same meaning and are interchangeable.

In the present invention, the Host material, Matrix material, Host or Matrix material have the same meaning and are interchangeable with each other.

In the present invention, the metal-organic complex, and the organometallic complex have the same meanings and may be interchanged.

The present invention relates to an organometallic complex comprising at least one represented by the formula (1):

chemical formula (1)

The symbols and indices used therein have the following meanings:

m is a metal atom selected from gold, platinum or palladium.

L¹Each occurrence, which may be the same or different, is a ligand comprising O ^ X, X is selected from O or N; preferably selected from bidentate chelating ligands, preferably monoanionic bidentate chelating ligands;

Ar¹at each occurrence, identical or different, is an aromatic, heteroaromatic or nonaromatic ring system having 5 to 20 ring atoms which may be interrupted by one or more radicals R¹Substituted, said radical R¹May be the same or different in multiple occurrences;

Ar²at each occurrence, identical or different, is an aromatic, heteroaromatic or nonaromatic ring system having 5 to 20 ring atoms which may be interrupted by one or more radicals R²Substituted, said radical R²May be the same or different in multiple occurrences;

R¹，R²in the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 30 carbon atoms.

In certain preferred embodiments, the organometallic complex according to formula (1) wherein Ar is¹Selected from unsubstituted or substituted aromatic or heteroaromatic rings having from 5 to 20, preferably from 5 to 18, most preferably from 5 to 12 ring atoms.

In further preferred embodiments, organometallic complexes according to formula (1), wherein Ar is²Selected from unsubstituted or substituted heteroaromatic rings having 5 to 20, preferably 5 to 18, more preferably 5 to 14, most preferably 5 to 12 ring atoms and comprising at least one ring heteroatom N.

An aromatic group refers to a hydrocarbon group containing at least one aromatic ring, including monocyclic groups and polycyclic ring systems. Heteroaromatic groups refer to hydrocarbon groups (containing heteroatoms) that contain at least one heteroaromatic ring, including monocyclic groups and polycyclic ring systems. These polycyclic rings may have two or more rings in which two carbon atoms are shared by two adjacent rings, i.e., fused rings. At least one of these ring species of the polycyclic ring is aromatic or heteroaromatic. For the purposes of the present invention, aromatic or heteroaromatic ring systems include not only aromatic or heteroaromatic systems, but also systems in which a plurality of aryl or heteroaryl groups may also be interrupted by short nonaromatic units (< 10% of non-H atoms, preferably less than 5% of non-H atoms, such as C, N or O atoms). Thus, for example, systems such as 9,9' -spirobifluorene, 9, 9-diarylfluorene, triarylamines, diaryl ethers, etc., are likewise considered aromatic ring systems for the purposes of the present invention.

Specifically, examples of aromatic groups are: benzene, naphthalene, anthracene, phenanthrene, perylene, tetracene, pyrene, benzopyrene, triphenylene, acenaphthene, fluorene, and derivatives thereof.

Specifically, examples of heteroaromatic groups are: furan, benzofuran, thiophene, benzothiophene, pyrrole, pyrazole, triazole, imidazole, oxazole, oxadiazole, thiazole, tetrazole, indole, carbazole, pyrroloimidazole, pyrrolopyrrole, thienopyrrole, thienothiophene, furopyrrole, furofuran, thienofuran, benzisoxazole, benzisothiazole, benzimidazole, pyridine, pyrazine, pyridazine, pyrimidine, triazine, quinoline, isoquinoline, phthalazine, quinoxaline, phenanthridine, primary pyridine, quinazoline, quinazolinone, and derivatives thereof.

In certain embodiments, Ar¹Or Ar²Selected from a non-aromatic ring system comprising one ring having 5 to 20 ring atoms unsubstituted or substituted with R. One possible benefit of this embodiment is that the triplet energy level of the metal complex can be increased, thereby facilitating the availability of green or blue emitters.

For the purposes of the present invention, non-aromatic ring systems contain from 1 to 10, preferably from 1 to 6, carbon atoms in the ring system and include both saturated and also partially unsaturated ring systems which may be unsubstituted or mono-or polysubstituted by radicals R which may be identical or different on each occurrence and may also contain one or more heteroatoms, preferably Si, N, P, O, S and/or Ge, particularly preferably selected from Si, N, P, O and/or S. These may be, for example, cyclohexyl-like or piperidine-like systems, but also cyclooctadiene-like cyclic systems. The term also applies to fused non-aromatic ring systems.

R is selected from (1) C1-C10 alkyl, and particularly preferably refers to the following groups: methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclobutyl, 2-methylbutyl, n-pentyl, n-hexyl, cyclohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoromethyl, 2,2, 2-trifluoroethyl, ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl, ethynyl, propynyl, butynyl, pentynyl, hexynyl, and octynyl; (2) C1-C10 alkoxy, particularly preferably methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy or 2-methylbutoxy; (3) c2 to C10 aryl or heteroaryl, which may be monovalent or divalent depending on the use, in each case also by the abovementioned radicals R¹⁰Substituted and may be attached to the aromatic or heteroaromatic ring in any desired position, particularly preferred are the following groups: benzene, naphthalene, anthracene, pyrene, chrysene, perylene, fluoranthene, tetracene, pentacene, benzopyrene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzofluorene, pyrrole, indole, isoindole, carbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5, 6-quinoline, benzo-6, 7-quinoline, benzo-7, 8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthoimidazole, phenanthroimidazole, pyridoimidazole, pyrazinoimidazole, quinoxalimidazole, oxazole, benzoxazole, naphthooxazole, anthraoxazole, phenanthroizole, isoxazole, 1, 2-thiazole, 1, 3-thiazoleBenzothiazole, pyridazine, benzopyridazine, pyrimidine, benzopyrimidine, quinoxaline, pyrazine, diazanthracene, 1, 5-naphthyridine, azocarbazole, benzocarbazine, phenanthroline, 1,2, 3-triazole, 1,2, 4-triazole, benzotriazole, 1,2, 3-oxadiazole, 1,2, 4-oxadiazole, 1,2, 5-oxadiazole, 1,3, 4-oxadiazole, 1,2, 3-thiadiazole, 1,2, 4-thiadiazole, 1,2, 5-thiadiazole, 1,3, 4-thiadiazole, 1,3, 5-triazine, 1,2, 4-triazine, 1,2, 3-triazine, tetrazole. 1,2,4, 5-tetrazine, 1,2,3, 4-tetrazine, 1,2,3, 5-tetrazine, purine, pteridine, indolizine and benzothiadiazole. For the purposes of the present invention, aromatic and heteroaromatic ring systems are to be understood as meaning, in particular, biphenylene, terphenylene, fluorene, spirobifluorene, dihydrophenanthrene, tetrahydropyrene and cis-or trans-indenofluorene, in addition to the abovementioned aryl and heteroaryl groups.

In a more preferred embodiment, the organometallic complex of the general formula (1) wherein Ar is¹-Ar²At least one aromatic or heteroaromatic group containing more than 6 ring atoms.

In a preferred embodiment, the organometallic complex of the general formula (1) wherein Ar is¹-Ar²May be selected from one of the following formulas:

wherein,

A¹、A²、A³、A⁴、A⁵、A⁶、A⁷、A⁸each independently represents CR₃Or N;

Y¹selected from the group consisting of CR₄R₅、SiR₄R₅、NR₃C (═ O), S, or O;

R₃、R₄、R₅selected from H, D, or a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 20C atoms, or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20C atoms orIs a silyl group, or a substituted keto group having 1 to 20C atoms, or an alkoxycarbonyl group having 2 to 20C atoms, or an aryloxycarbonyl group having 7 to 20C atoms, a cyano group (-CN), a carbamoyl group (-C (═ O) NH₂) A haloformyl group (-C (═ O) -X wherein X represents a halogen atom), a formyl group (-C (═ O) -H), an isocyano group, an isocyanate group, a thiocyanate group or an isothiocyanate group, a hydroxyl group, a nitro group, CF₃A radical, Cl, Br, F, a crosslinkable radical or a substituted or unsubstituted aromatic or heteroaromatic ring system having from 5 to 40 ring atoms or an aryloxy or heteroaryloxy radical having from 5 to 40 ring atoms or a combination of these systems, where one or more radicals R³，R⁴，R⁵The rings which may be bonded to each other and/or to the radicals form mono-or polycyclic aliphatic or aromatic rings.

In a more preferred embodiment, Ar in formula (1)¹，Ar²Can be selected from one of the following structural groups, wherein H on the ring can be optionally substituted:

in a more preferred embodiment, the transition metal complex according to the invention, wherein Ar in formula (1)¹Selected from the following general formulae:

wherein #2 represents Ar in the formula (1)²Is bonded at any position of the base. M is a metal atom selected from gold, platinum or palladium, with gold being particularly preferred.

Z^1-18In multiple occurrences, the same or different, comprises one or more carbon, or nitrogen, or oxygen, or silicon, or boron, sulfur, or phosphorus atoms.

R^3-5In the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 20 carbon atoms.

In another preferred embodiment, the transition metal complex according to the present invention, wherein Ar in formula (1)²Selected from the following general formulae:

wherein #1 represents Ar in the formula (1)¹Is bonded at any position of the base. M is a metal atom selected from gold, platinum or palladium, with gold being particularly preferred.

Z^19-36In multiple occurrences, the same or different, comprises one or more carbon, or nitrogen, or oxygen, or silicon, or boron, sulfur, or phosphorus atoms.

R^6-8In the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 20 carbon atoms.

Specifically, in a more preferred embodiment, Ar in formula (1)¹,Ar²At least one of the atoms coordinately bound to metal center M is a carbon atom, and particularly preferably both of them are carbon atoms.

In certain more preferred embodiments, the organometallic complex according to the invention is selected from one of the following formulae:

wherein L is²And L as claimed in claims 1 to 6¹The definitions are the same;

y, when present a plurality of times, may, the same or different, comprise one or more carbon, or nitrogen, or oxygen, or silicon, or boron, sulfur or phosphorus atoms.

R^16-20Identical or different at each occurrence is a hydrogen or deuterium or halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or non-aromatic ring system which may be substituted or unsubstituted having from 1 to 20 carbon atoms.

The transition metal complex according to the present invention, L in the formula (1)¹Is a ligand comprising O ^ X, having the following general formula, wherein X is preferably selected from O or N:

in a preferred embodiment, the transition metal complex according to the invention, L in formula (1)¹And L in the chemical formulae (A-1) to (A-36)²Is a monoanionic bidentate chelating ligand, preferably selected from the following structures:

wherein R is^9-13In the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 20 carbon atoms.

V, when present in multiple instances, may be the same or different and is selected from the group consisting of linear alkanes, branched alkanes, linear alkenes, branched alkenes, alkane ethers, and O, S, S ═ O, SO₂、N(R)、B(R)、Si(R)₂、Ge(R)₂、P(R)、P(＝O)R、P(R)₃、Sn(R)₂、C(R)₂、C＝O、C＝S、C＝Se、C＝N(R)₂Or C ═ C (R)₂. And R is hydrogen or deuterium or halogen atom or straight-chain alkane, branched alkane, alkane ether, alkane aromatic ring system, alkane heteroaromatic or alkane non-aromatic ring system with 1-20 carbon atoms.

In a particularly preferred embodiment, L in formula (1)¹Preferably selected from the following structures:

wherein M is a metal atom, representing gold, platinum or palladium, with particular preference gold.

R^14-15In the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 20 carbon atoms.

According to the organometallic complex of the present invention, the metal element M is selected from any one of gold (Au), palladium (Pd) and platinum (Pt).

In a particularly preferred embodiment, the metal element M is Au.

Au is particularly preferably used as the central metal M of the above-mentioned metal-organic complex from the viewpoint of the heavy atom effect. This is because iridium is chemically stable and has a significant heavy atom effect to obtain high luminous efficiency.

Specific examples of suitable organometallic complexes according to the invention are given below, without being restricted to:

wherein R in the metal complexes (Au-1) to (Au-216)²¹-R³⁰In the multiple occurrences, identical or different, are hydrogen or deuterium or a halogen atom or a linear alkane, branched alkane, linear alkene, branched alkene, alkane ether, aromatic, heteroaromatic or nonaromatic ring system having from 1 to 30 carbon atoms.

In a particularly preferred embodiment, the organometallic complexes according to the invention are luminescent materials which emit light at a wavelength of between 300 and 1000nm, preferably between 350 and 900nm, more preferably between 400 and 800 nm. Luminescence as used herein refers to photoluminescence or electroluminescence. In certain preferred embodiments, the organometallic complexes according to the invention have a photoluminescence efficiency of 30% or more, preferably 40% or more, more preferably 50% or more, most preferably 60% or more.

In certain embodiments, the metal-organic complex according to the present invention may also be a non-emissive material.

The invention also relates to a high polymer, wherein at least one repeating unit comprises a structure shown as a chemical formula (I). In certain embodiments, the polymer is a non-conjugated polymer, wherein the structural unit of formula (I) is in a side chain. In another preferred embodiment, the polymer is a conjugated polymer.

In a preferred embodiment, the polymer is synthesized by a method selected from the group consisting of SUZUKI-, YAMAMOTO-, STILLE-, NIGESHI-, KUMADA-, HECK-, SONOGASHIRA-, HIYAMA-, FUKUYAMA-, HARTWIG-BUCHWALD-and ULLMAN.

In a preferred embodiment, the polymers according to the invention have a glass transition temperature (Tg) of 100 ℃ or more, preferably 120 ℃ or more, more preferably 140 ℃ or more, more preferably 160 ℃ or more, most preferably 180 ℃ or more.

In a preferred embodiment, the polymer according to the invention preferably has a molecular weight distribution (PDI) in the range of 1 to 5; more preferably 1 to 4; more preferably 1 to 3, more preferably 1 to 2, and most preferably 1 to 1.5.

In a preferred embodiment, the polymers according to the invention preferably have a weight-average molecular weight (Mw) ranging from 1 to 100 ten thousand; more preferably 5 to 50 ten thousand; more preferably 10 to 40 ten thousand, still more preferably 15 to 30 ten thousand, and most preferably 20 to 25 ten thousand.

The invention also relates to mixtures comprising at least one organometallic complex or polymer according to the invention and at least one further organic functional material. The organic functional material includes hole (also called hole) injection or transport material (HIM/HTM), Hole Blocking Material (HBM), electron injection or transport material (EIM/ETM), Electron Blocking Material (EBM), organic Host material (Host), singlet emitter (fluorescent emitter), triplet emitter (phosphorescent emitter), especially luminescent organometallic complex, and doping material (Dopant). Various organic functional materials are described in detail, for example, in WO2010135519a1, US20090134784a1 and WO 2011110277a1, the entire contents of this 3 patent document being hereby incorporated by reference. The organic functional material can be small molecule and high polymer material.

In certain embodiments, the mixture according to the invention contains the organometallic complex in an amount of 0.01 to 30 wt.%, preferably 0.5 to 20 wt.%, more preferably 2 to 15 wt.%, most preferably 5 to 15 wt.%.

In a preferred embodiment, the mixture according to the invention comprises a metal-organic complex or polymer according to the invention and a triplet matrix material.

In a further preferred embodiment, the mixtures according to the invention comprise a metal-organic complex or polymer according to the invention, a triplet matrix material and a further triplet emitter.

In a further preferred embodiment, the mixtures according to the invention comprise a metal-organic complex or polymer according to the invention and a thermally activated delayed fluorescence phosphor (TADF).

In a further preferred embodiment, the mixtures according to the invention comprise a metal-organic complex or polymer according to the invention, a triplet matrix material and a thermally activated delayed fluorescence emitter (TADF).

Some more detailed descriptions of triplet host materials, triplet emitters and TADF materials are provided below (but not limited thereto).

1. Triplet Host material (Triplet Host):

examples of the triplet Host material are not particularly limited, and any metal complex or organic compound may be used as the Host as long as the triplet energy level thereof is higher than that of a light emitter, particularly a triplet light emitter or a phosphorescent light emitter, and examples of the metal complex which can be used as the triplet Host (Host) include, but are not limited to, the following general structures:

m3 is a metal; (Y)³-Y⁴) Is a bidentate ligand, Y³And Y⁴Independently selected from C, N, O, P, and S; l is an ancillary ligand; m3 is an integer having a value from 1 to the maximum coordination number of the metal; in a preferred embodiment, the metal complexes useful as triplet hosts are of the form:

(O-N) is a bidentate ligand wherein the metal is coordinated to both the O and N atoms, and m3 is an integer having a value from 1 up to the maximum coordination number for the metal;

in one embodiment, M3 may be selected from Ir and Pt.

Examples of the organic compound which can be a triplet host are selected from compounds containing a cyclic aromatic hydrocarbon group such as benzene, biphenyl, triphenylbenzene, benzofluorene; compounds containing aromatic heterocyclic groups, such as dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, dibenzocarbazole, indolocarbazole, pyridine indole, pyrrole bipyridine, pyrazole, imidazole, triazoles, oxazole, thiazole, oxadiazole, bisoxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, oxazole, dibenzooxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, phthalazine, quinazoline, quinoxaline, naphthalene, phthalein, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuran pyridine, furopyridine, benzothiophene pyridine, thiophene pyridine, benzoselenophene pyridine, and selenophene benzodipyridine; groups having 2 to 10 ring structures, which may be the same or different types of cyclic aromatic hydrocarbon groups or aromatic heterocyclic groups, are bonded to each other directly or through at least one group selected from the group consisting of an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, a phosphorus atom, a boron atom, a chain structural unit and an alicyclic group. Wherein each Ar may be further substituted, and the substituents may be selected from the group consisting of hydrogen, deuterium, cyano, halogen, alkyl, alkoxy, amino, alkene, alkyne, aralkyl, heteroalkyl, aryl and heteroaryl.

In a preferred embodiment, the triplet host material may be selected from compounds comprising at least one of the following groups:

R₂-R₇has the same meaning as R₁，X₉Selected from CR1R2 or NR1, Y is selected from CR₁R₂Or NR₁Or O or S. R₁，n₂，X¹-X⁸，Ar₁～Ar₃The meaning of (A) is as described above.

Examples of suitable triplet host materials are listed in the following table but are not limited to:

2. thermally activated delayed fluorescence luminescent material (TADF):

the traditional organic fluorescent material can only emit light by utilizing 25% singlet excitons formed by electric excitation, and the internal quantum efficiency of the device is low (up to 25%). Although the phosphorescence material enhances the intersystem crossing due to the strong spin-orbit coupling of the heavy atom center, the singlet excitons and the triplet excitons formed by the electric excitation can be effectively used for emitting light, so that the internal quantum efficiency of the device reaches 100 percent. However, the application of the phosphorescent material in the OLED is limited by the problems of high price, poor material stability, serious efficiency roll-off of the device and the like. The thermally activated delayed fluorescence emitting material is a third generation organic emitting material developed after organic fluorescent materials and organic phosphorescent materials. Such materials generally have a small singlet-triplet energy level difference (Δ Est), and triplet excitons may be converted to singlet excitons for emission by intersystem crossing. This can make full use of singlet excitons and triplet excitons formed upon electrical excitation. The quantum efficiency in the device can reach 100%. Meanwhile, the material has controllable structure, stable property, low price and no need of noble metal, and has wide application prospect in the field of OLED.

TADF materials need to have a small singlet-triplet level difference, preferably Δ Est <0.3eV, less preferably Δ Est <0.25eV, more preferably Δ Est <0.20eV, and most preferably Δ Est <0.1 eV. In a preferred embodiment, the TADF material has a relatively small Δ Est, and in another preferred embodiment, the TADF has a good fluorescence quantum efficiency. Some TADF luminescent materials may be found in patent documents CN103483332(a), TW201309696(a), TW201309778(a), TW201343874(a), TW201350558(a), US20120217869(a1), WO2013133359(a1), WO2013154064(a1), Adachi, et. al. adv.mater, 21,2009,4802, Adachi, et. al. appl.phys.lett.,98,2011,083302, Adachi, et. appl.phys.lett, 101,2012,093306, Adachi, chem.comm.comm, 48,2012,11392, Adachi, et. nature. natronics, 6,2012,253, Adachi, et. nature,492,2012,234, Adachi, am.j.am, Adachi, et. adochi, et. nature, adochi, et. phytol.73, adochi, et. phyton.8, Adachi, adachi.73, et. phytol.73, Adachi, et. phyton.73, et. phytol.35, Adachi, et. phytol.8, Adachi, adachi.t.t.t.

Some examples of suitable TADF phosphors are listed in the following table:

3. triplet Emitter (Triplet Emitter)

Triplet emitters are also known as phosphorescent emitters. In a preferred embodiment, the triplet emitter is a metal complex of the general formula M (L) n, where M is a metal atom, L, which may be the same or different at each occurrence, is an organic ligand which is bonded or coordinately bound to the metal atom M via one or more positions, and n is an integer greater than 1, preferably 1,2,3,4, 5 or 6. Optionally, the metal complexes are coupled to a polymer through one or more sites, preferably through organic ligands.

In a preferred embodiment, the metal atom M is chosen from transition metals or lanthanides or actinides, preferably Ir, Pt, Pd, Au, Rh, Ru, Os, Sm, Eu, Gd, Tb, Dy, Re, Cu or Ag, particularly preferably Os, Ir, Ru, Rh, Re, Pd, Au or Pt.

Preferably, the triplet emitter comprises a chelating ligand, i.e. a ligand, which coordinates to the metal via at least two binding sites, particularly preferably the triplet emitter comprises two or three identical or different bidentate or polydentate ligands. Chelating ligands are advantageous for increasing the stability of the metal complex.

Examples of organic ligands may be selected from phenylpyridine derivatives, 7, 8-benzoquinoline derivatives, 2 (2-thienyl) pyridine derivatives, 2 (1-naphthyl) pyridine derivatives, or 2-phenylquinoline derivatives. All of these organic ligands may be substituted, for example, with fluorine-containing or trifluoromethyl groups. The ancillary ligand may preferably be selected from acetone acetate or picric acid.

In a preferred embodiment, the metal complexes which can be used as triplet emitters are of the form:

where M is a metal selected from the transition metals or the lanthanides or actinides, particularly preferably Ir, Pt, Au;

Ar₁each occurrence of which may be the same or different, is a cyclic group containing at least one donor atom, i.e., an atom having a lone pair of electrons, such as nitrogen or phosphorus, through which the cyclic group is coordinately bound to the metal; ar (Ar)₂Each occurrence, which may be the same or different, is a cyclic group containing at least one C atom through which the cyclic group is attached to the metal; ar (Ar)₁And Ar₂Linked together by a covalent bond, which may each carry one or more substituent groups, which may in turn be linked together by substituent groups; l', which may be the same or different at each occurrence, is a bidentate chelating ancillary ligand, preferably a monoanionic bidentate chelating ligand; q1 may be 0,1,2 or 3, preferably 2 or 3; q2 may be 0,1,2 or 3, preferably 1 or 0.

Examples of materials and their use for some triplet emitters can be found in WO 200070655, WO 200141512, WO 200202714, WO 200215645, EP 1191613, EP 1191612, EP 1191614, WO 2005033244, WO 2005019373, US 2005/0258742, WO 2009146770, WO 2010015307, WO 2010031485, WO 2010031485, WO 2010031485, WO 2010031485, WO 2010031485, WO 2010031485, US 2010031485A 2010031485, US 2010031485A 2010031485, Baldo, Thompson et al. Nature 403, (2000), 750-and-753, US 2010031485A 2010031485, US 2010031485A 2010031485, Adachi. Appl. Phyt. Lett.78(2001), 1622-and-1624, J.Kido et al. Appl. Phys. Lett.65(1994), U.Kido.Phyt. 364, U.657, US 2010031485, US 2010031485A 2010031485, US 2010031485A 2010031485, US 2010031485A 2010031485, US 2010031485, US 2010031485, US 2010031485A 2010031485, US 2010031485A, WO2012007087a1, WO 2012007086a1, US 2008027220a1, WO 2011157339a1, CN 102282150a, WO 2009118087a1, WO 2013107487a1, WO 2013094620a1, WO 2013174471a1, WO 2014031977a1, WO 2014112450a1, WO 2014007565A1, WO 2014038456a1, WO 2014024131a1, WO 2014008982a1, WO2014023377a 1. The entire contents of the above listed patent documents and literature are hereby incorporated by reference.

Some examples of suitable triplet emitters are listed in the following table:

it is an object of the present invention to provide a material solution for evaporation type OLEDs.

In a preferred embodiment, the organometallic complexes according to the invention are used in evaporative OLED devices. For this purpose, the organometallic complexes according to the invention have a molecular weight of 1100g/mol or less, preferably 1000g/mol or less, very preferably 950g/mol or less, most preferably 900g/mol or less.

It is another object of the present invention to provide a material solution for printing OLEDs.

In certain embodiments, the metal-organic complexes according to the invention have a molecular weight of 800g/mol or more, preferably 900g/mol or more, very preferably 1000g/mol or more, most preferably 1100g/mol or more.

In further embodiments, the metal-organic complexes according to the invention have a solubility in toluene of 3mg/ml or more, preferably 4mg/ml or more, more preferably 6mg/ml or more, most preferably 8mg/ml or more at 25 ℃.

The invention further relates to a composition or printing ink comprising a metal organic complex or polymer as described above or a mixture thereof and at least one organic solvent.

The invention further provides a process for preparing films from solutions which comprise the organometallic complexes or polymers according to the invention.

For the printing process, the viscosity of the ink, surface tension, is an important parameter. Suitable inks have surface tension parameters suitable for a particular substrate and a particular printing process.

In a preferred embodiment, the surface tension of the ink according to the invention at operating temperature or at 25 ℃ is in the range of about 19dyne/cm to about 50 dyne/cm; more preferably in the range of 22dyne/cm to 35 dyne/cm; preferably in the range of 25dyne/cm to 33 dyne/cm.

In another preferred embodiment, the viscosity of the ink according to the invention is in the range of about 1cps to about 100cps at the operating temperature or 25 ℃; preferably in the range of 1cps to 50 cps; more preferably in the range of 1.5cps to 20 cps; preferably in the range of 4.0cps to 20 cps. The composition so formulated will be suitable for ink jet printing.

The viscosity can be adjusted by different methods, such as by appropriate solvent selection and concentration of the functional material in the ink. The inks according to the invention comprising the organometallic complexes or polymers described facilitate the adjustment of the printing inks to the appropriate range according to the printing process used. Generally, the composition according to the present invention comprises the functional material in a weight ratio ranging from 0.3% to 30% by weight, preferably ranging from 0.5% to 20% by weight, more preferably ranging from 0.5% to 15% by weight, still more preferably ranging from 0.5% to 10% by weight, and most preferably ranging from 1% to 5% by weight.

In some embodiments, the ink according to the invention, the at least one organic solvent is chosen from aromatic or heteroaromatic-based solvents, in particular aliphatic chain/ring-substituted aromatic solvents, or aromatic ketone solvents, or aromatic ether solvents.

Examples of solvents suitable for the present invention are, but not limited to: aromatic or heteroaromatic-based solvents p-diisopropylbenzene, pentylbenzene, tetrahydronaphthalene, cyclohexylbenzene, chloronaphthalene, 1, 4-dimethylnaphthalene, 3-isopropylbiphenyl, p-methylisopropylbenzene, dipentylbenzene, tripentylbenzene, pentyltoluene, o-xylene, m-xylene, p-xylene, o-diethylbenzene, m-diethylbenzene, p-diethylbenzene, 1,2,3, 4-tetramethylbenzene, 1,2,3, 5-tetramethylbenzene, 1,2,4, 5-tetramethylbenzene, butylbenzene, dodecylbenzene, dihexylbenzene, dibutylbenzene, p-diisopropylbenzene, 1-methoxynaphthalene, cyclohexylbenzene, dimethylnaphthalene, 3-isopropylbiphenyl, p-methylisopropylbenzene, 1-methylnaphthalene, 1,2, 4-trichlorobenzene, 1, 3-dipropoxybenzene, 4-difluorodiphenylmethane, 1, 2-dimethoxy-4- (1-propenyl) benzene, 1, 4-dimethoxynaphthalene, Diphenylmethane, 2-phenylpyridine, 3-phenylpyridine, N-methyldiphenylamine, 4-isopropylbiphenyl, dichlorodiphenylmethane, 4- (3-phenylpropyl) pyridine, benzyl benzoate, 1-bis (3, 4-dimethylphenyl) ethane, 2-isopropylnaphthalene, dibenzyl ether, etc.; ketone-based solvents 1-tetralone, 2- (phenylepoxy) tetralone, 6- (methoxy) tetralone, acetophenone, propiophenone, benzophenone, and derivatives thereof, such as 4-methylacetophenone, 3-methylacetophenone, 2-methylacetophenone, 4-methylpropiophenone, 3-methylpropiophenone, 2-methylpropiophenone, isophorone, 2,6, 8-trimethyl-4-nonanone, fenchyne, 2-nonanone, 3-nonanone, 5-nonanone, 2-decanone, 2, 5-hexanedione, phorone, di-n-amyl ketone; aromatic ether solvent: 3-phenoxytoluene, butoxybenzene, benzylbutylbenzene, p-anisaldehyde dimethylacetal, tetrahydro-2-phenoxy-2H-pyran, 1, 2-dimethoxy-4- (1-propenyl) benzene, 1, 4-benzodioxane, 1, 3-dipropylbenzene, 2, 5-dimethoxytoluene, 4-ethylbenylether, 1,2, 4-trimethoxybenzene, 4- (1-propenyl) -1, 2-dimethoxybenzene, 1, 3-dimethoxybenzene, glycidylphenyl ether, dibenzyl ether, 4-t-butylanisole, trans-p-propenylanisole, 1, 2-dimethoxybenzene, 1-methoxynaphthalene, diphenyl ether, 2-phenoxymethyl ether, 2-phenoxytetrahydrofuran, and the like, Ethyl-2-naphthyl ether, amyl ether c-hexyl ether, dioctyl ether, ethylene glycol dibutyl ether, diethylene glycol diethyl ether, diethylene glycol butyl methyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol ethyl methyl ether, triethylene glycol butyl methyl ether, tripropylene glycol dimethyl ether, tetraethylene glycol dimethyl ether; ester solvent: alkyl octanoates, alkyl sebacates, alkyl stearates, alkyl benzoates, alkyl phenylacetates, alkyl cinnamates, alkyl oxalates, alkyl maleates, alkyl lactones, alkyl oleates, and the like.

Further, according to the ink of the present invention, the at least one organic solvent may be selected from: aliphatic ketones such as 2-nonanone, 3-nonanone, 5-nonanone, 2-decanone, 2, 5-hexanedione, 2,6, 8-trimethyl-4-nonanone, phorone, di-n-amyl ketone and the like; or aliphatic ethers such as amyl ether, hexyl ether, dioctyl ether, ethylene glycol dibutyl ether, diethylene glycol diethyl ether, diethylene glycol butyl methyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol ethyl methyl ether, triethylene glycol butyl methyl ether, tripropylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, and the like.

In other embodiments, the printing ink further comprises another organic solvent. Examples of another organic solvent include (but are not limited to): methanol, ethanol, 2-methoxyethanol, methylene chloride, chloroform, chlorobenzene, o-dichlorobenzene, tetrahydrofuran, anisole, morpholine, toluene, o-xylene, m-xylene, p-xylene, 1, 4-dioxane, acetone, methyl ethyl ketone, 1, 2-dichloroethane, 3-phenoxytoluene, 1,1, 1-trichloroethane, 1,1,2, 2-tetrachloroethane, ethyl acetate, butyl acetate, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, tetrahydronaphthalene, decalin, indene, and/or mixtures thereof.

In a preferred embodiment, the composition according to the invention is a solution.

In another preferred embodiment, the composition according to the invention is a suspension.

The invention also relates to the use of said composition as a coating or printing ink for the production of organic electronic devices, particularly preferably by a printing or coating production process.

Suitable Printing or coating techniques include, but are not limited to, ink jet Printing, jet Printing (Nozzle Printing), letterpress Printing, screen Printing, dip coating, spin coating, knife coating, roll Printing, twist roll Printing, offset Printing, flexographic Printing, rotary Printing, spray coating, brush or pad Printing, jet Printing (Nozzle Printing), slot die coating, and the like. Ink jet printing, slot die coating, spray printing and gravure printing are preferred. The solution or suspension may additionally contain one or more components such as surface active compounds, lubricants, wetting agents, dispersants, hydrophobing agents, binders, etc., for adjusting viscosity, film-forming properties, improving adhesion, etc. For details on the printing technology and its requirements concerning the solutions, such as solvents and concentrations, viscosities, etc., reference is made to the Handbook of Print Media, technology and Production Methods, published by Helmut Kipphan, ISBN 3-540-67326-1.

Based on the organometallic complex, the invention also provides an application of the organometallic complex or the high polymer in an organic electronic device. The Organic electronic device can be selected from, but not limited to, Organic Light Emitting Diodes (OLEDs), Organic photovoltaic cells (OPVs), Organic light Emitting cells (OLEECs), Organic Field Effect Transistors (OFETs), Organic light Emitting field effect transistors (efets), Organic lasers, Organic spintronic devices, Organic sensors, Organic Plasmon Emitting diodes (Organic plasma Emitting diodes), and the like, particularly OLEDs. In the embodiment of the present invention, the organometallic complex is preferably used in a light emitting layer of an OLED device.

The invention further relates to an organic electronic component comprising at least one organometallic complex or polymer as described above. Generally, such organic electronic devices comprise at least a cathode, an anode and a functional layer disposed between the cathode and the anode, wherein the functional layer comprises at least one organometallic complex or polymer as described above. The Organic electronic device can be selected from, but not limited to, an Organic Light Emitting Diode (OLED), an Organic photovoltaic cell (OPV), an Organic light Emitting cell (OLEEC), an Organic Field Effect Transistor (OFET), an Organic light Emitting field effect transistor (effet), an Organic laser, an Organic spintronic device, an Organic sensor, and an Organic Plasmon Emitting Diode (Organic plasma Emitting Diode).

In a particularly preferred embodiment, the organic electronic device is an electroluminescent device, particularly preferably an OLED, comprising a substrate, an anode, at least one light-emitting layer, and a cathode.

The substrate may be opaque or transparent. A transparent substrate may be used to fabricate a transparent light emitting device. See, for example, Bulovic et al Nature 1996,380, p29, and Gu et al, appl.Phys.Lett.1996,68, p 2606. The substrate may be rigid or flexible. The substrate may be plastic, metal, semiconductor chip or glass. Preferably, the substrate has a smooth surface. A substrate free of surface defects is a particularly desirable choice. In a preferred embodiment, the substrate is flexible, and may be selected from polymeric films or plastics having a glass transition temperature Tg of 150 deg.C or greater, preferably greater than 200 deg.C, more preferably greater than 250 deg.C, and most preferably greater than 300 deg.C. Examples of suitable flexible substrates are poly (ethylene terephthalate) (PET) and polyethylene glycol (2, 6-naphthalene) (PEN).

The anode may comprise a conductive metal or metal oxide, or a conductive polymer. The anode can easily inject holes into a Hole Injection Layer (HIL) or a Hole Transport Layer (HTL) or an emission layer. In one embodiment, the absolute value of the difference between the work function of the anode and the HOMO level or valence band level of the emitter in the light emitting layer or the p-type semiconductor material acting as a HIL or HTL or Electron Blocking Layer (EBL) is less than 0.5eV, preferably less than 0.3eV, most preferably less than 0.2 eV. Examples of anode materials include, but are not limited to: al, Cu, Au, Ag, Mg, Fe, Co, Ni, Mn, Pd, Pt, ITO, aluminum-doped zinc oxide (AZO), and the like. Other suitable anode materials are known and can be readily selected for use by one of ordinary skill in the art. The anode material may be deposited using any suitable technique, such as a suitable physical vapor deposition method, including radio frequency magnetron sputtering, vacuum thermal evaporation, electron beam (e-beam), and the like. In certain embodiments, the anode is pattern structured. Patterned ITO conductive substrates are commercially available and can be used to prepare devices according to the present invention.

The cathode may comprise a conductive metal or metal oxide. The cathode can easily inject electrons into the EIL or ETL or directly into the light emitting layer. In one embodiment, the absolute value of the difference between the work function of the cathode and the LUMO level or conduction band level of the emitter in the light-emitting layer or of the n-type semiconductor material as Electron Injection Layer (EIL) or Electron Transport Layer (ETL) or Hole Blocking Layer (HBL) is less than 0.5eV, preferably less than 0.3eV, most preferably less than 0.2 eV. In principle, all materials which can be used as cathodes in OLEDs are possible as cathode materials for the device according to the invention. Examples of cathode materials include, but are not limited to: al, Au, Ag, Ca, Ba, Mg, LiF/Al, MgAg alloy, BaF2/Al, Cu, Fe, Co, Ni, Mn, Pd, Pt, ITO, etc. The cathode material may be deposited using any suitable technique, such as a suitable physical vapor deposition method, including radio frequency magnetron sputtering, vacuum thermal evaporation, electron beam (e-beam), and the like.

The OLED may also comprise further functional layers, such as a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Blocking Layer (EBL), an Electron Injection Layer (EIL), an Electron Transport Layer (ETL), a Hole Blocking Layer (HBL). Suitable materials for use in these functional layers are described above.

In a preferred embodiment, in the light-emitting device according to the present invention, the light-emitting layer contains an organometallic complex or a high polymer according to the present invention, and the light-emitting layer can be prepared by a vacuum evaporation method or a solution processing method.

The light emitting device according to the present invention emits light at a wavelength of between 300 and 1000nm, preferably between 350 and 900nm, most preferably between 400 and 800 nm.

The invention also relates to the use of the organic electronic device according to the invention in various electronic devices, including, but not limited to, display devices, lighting devices, light sources, sensors, etc.

The present invention will be described in connection with preferred embodiments, but the present invention is not limited to the following embodiments, and it should be understood that the appended claims outline the scope of the present invention and those skilled in the art, guided by the inventive concept, will appreciate that certain changes may be made to the embodiments of the invention, which are intended to be covered by the spirit and scope of the appended claims.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

1. Metal organic complex and energy structure thereof

The energy level of the metal-organic complex can be obtained by quantum calculation, for example, by using TD-DFT (time-density functional theory) through Gaussian03W (Gaussian Inc.), and a specific simulation method can be seen in WO 2011141110. Firstly, a semi-empirical method of 'group State/Hartree-Fock/Default Spin/LanL2 MB' (Charge 0/Spin Singlet) is used for optimizing the molecular geometrical structure, and then the energy structure of the organic molecule is calculated by a TD-DFT (time-density functional theory) method to obtain 'TD-SCF/DFT/Default Spin/B3PW91/gen gain ═ connection property pseudo ═ lan 2' (Charge 0/Spin Singlet). The HOMO and LUMO energy levels were calculated according to the following calibration formula, and S1 and T1 were used directly.

HOMO(eV)＝((HOMO(Gaussian)×27.212)-0.9899)/1.1206

LUMO(eV)＝((LUMO(Gaussian)×27.212)-2.0041)/1.385

Where HOMO (G) and LUMO (G) are direct calculations of Gaussian03W in Hartree. The results are shown in table one:

watch 1

2. Synthesis of metal organic complexes

Synthesis example 1 Synthesis of Complex Au-1:

synthesis of intermediate a:

in a dry 1000ml two-necked flask was placed 2,2' -bisbromobenzene (20g,1eq), evacuated and circulated under nitrogen three times, then dissolved by addition of anhydrous diethyl ether (600ml), cooled to 77K and added with n-butyllithium (54ml,2eq) and stirred at room temperature for 2 hours. Then, dibutyltin dichloride (19.6g,1.01eq) was dissolved in 60ml of diethyl ether and added to the reaction by syringe. Stir at room temperature for one day, add water and then separate the layers. The ether layer was spun dry and purified on column to give light white intermediate a (50% yield).

Synthesis of intermediate B:

in a dry 500ml two-necked flask, tetrachloroauric acid (10g,1eq) was placed, dissolved by adding 200ml of acetonitrile, followed by addition of intermediate A (10g,1.02eq) and the reaction was allowed to proceed at 80 ℃ for one day. The white precipitate was filtered and washed with acetonitrile and dichloromethane to give pale intermediate B (31% yield).

Synthesizing Au-1:

in a dry 250ml bottle, 2, 8-dimethyl-4, 6-nonanedione (0.5g,2eq) and sodium carbonate (0.18g,5eq) and dissolved with a minimum amount of ethanol were placed. Then 50ml of chloroform was added, followed by addition of intermediate B (1g,1eq) and the reaction temperature was raised to 50 ℃ and stirred for one day. The reaction solution was then spun dry and dissolved in chloroform, and then the incompletely dissolved solid was filtered off. Methanol was added to the filtrate to precipitate out, and after filtration, Au-1 was obtained as a white solid (yield 40%).

Synthesis example 2 Synthesis of Complex Au-3:

synthesis of intermediate C:

in a dry 1000ml two-necked flask were placed 1, 2-dibromobenzene (20g,1eq), 2, 3-dibromonaphthalene (24.2g,1eq), pinacol diboron diborate (21.5g,1eq), Pd (ddpf) Cl₂(6.2g,0.1eq) and potassium phosphate (90g,5eq), then dioxane (500ml) was added and the reaction was heated to 80 ℃ with stirring for one day. The reaction mixture was then dried by spinning, separated with water and dichloromethane, the organic phase was dried by spinning, and purified by column chromatography to give a tan intermediate C (yield 13%).

Synthesis of intermediate D:

intermediate C (23.2g,1eq) was placed in a dry 1000ml two-necked flask, evacuated and sparged with nitrogen three times, then dissolved by addition of anhydrous diethyl ether (600ml), cooled to 77K and added with n-butyllithium (54ml,2eq) and stirred at room temperature for 2 hours. Then, dibutyltin dichloride (19.6g,1.01eq) was dissolved in 60ml of diethyl ether and added to the reaction by syringe. Stir at room temperature for one day, add water and then separate the layers. The ether layer was spun dry and purified on column to give light white intermediate D (59% yield).

Synthesis of intermediate E:

in a dry 500ml two-necked flask, tetrachloroauric acid (10g,1eq) was placed, dissolved by adding 200ml of acetonitrile, followed by addition of intermediate D (11.3g,1.02eq) and the reaction was allowed to proceed at 80 ℃ for one day. The white precipitate was filtered and washed with acetonitrile and dichloromethane to give pale intermediate E (28% yield).

Synthesizing Au-3:

in a dry 250ml bottle, acetylacetone (0.27g,2eq) and sodium carbonate (0.18g,5eq) were placed and dissolved with a minimum amount of ethanol. Then 50ml of chloroform was added, and then intermediate E (1.13g,1eq) was added to raise the reaction temperature to 50 ℃ and stirred for one day. The reaction solution was then spun dry and dissolved in chloroform, and then the incompletely dissolved solid was filtered off. Methanol was added to the filtrate to precipitate out, and white solid Au-3 was obtained after filtration (yield 24%).

Synthesis example 3 Synthesis of Complex Au-6:

synthesis of intermediate F:

in a dry 1000ml two-necked flask were placed 2, 3-dibromonaphthalene (48.4g,2eq), pinacol diboron (21.5g,1eq), Pd (ddpf) Cl₂(6.2g,0.1eq) and potassium phosphate (90g,5eq), then dioxane (500ml) was added and the reaction was heated to 80 ℃ with stirring for one day. The reaction mixture was then dried by spinning, separated with water and dichloromethane, the organic phase was dried by spinning, and purified by column chromatography to give a tan intermediate F (yield 19%).

Synthesis of intermediate G:

intermediate F (26.4g,1eq) was placed in a dry 1000ml two-necked flask, evacuated and sparged with nitrogen three times, then dissolved by addition of dry diethyl ether (600ml), cooled to 77K and added with n-butyllithium (54ml,2eq) and stirred at room temperature for 2 hours. Then, dibutyltin dichloride (19.6g,1.01eq) was dissolved in 60ml of diethyl ether and added to the reaction by syringe. Stir at room temperature for one day, add water and then separate the layers. The ether layer was spin dried and purified on column to give intermediate G as pale white (70% yield).

Synthesis of intermediate H:

in a dry 500ml two-necked flask, tetrachloroauric acid (10G,1eq) was placed, dissolved by adding 200ml of acetonitrile, followed by addition of intermediate G (12.6G,1.02eq) and the reaction was allowed to proceed at 80 ℃ for one day. The white precipitate was filtered and washed with acetonitrile and dichloromethane to give light white intermediate H (28% yield).

Synthesizing Au-6:

in a dry 250ml bottle, acetylacetone (0.27g,2eq) and sodium carbonate (0.18g,5eq) were placed and dissolved with a minimum amount of ethanol. Then 50ml of chloroform was added, then intermediate H (1.26g,1eq) was added and the reaction temperature was raised to 50 ℃ and stirred for one day. The reaction solution was then spun dry and dissolved in chloroform, and then the incompletely dissolved solid was filtered off. Methanol was added to the filtrate to precipitate out, and after filtration, Au-6 was obtained as a white solid (yield 15%).

Synthesis example 4 Synthesis of Complex c-Au-1

Synthesis of c-Au-1:

in a dry 250ml bottle, 2, 8-dimethyl-4, 6-nonanedione (0.27g,2eq) and sodium carbonate (0.18g,5eq) and dissolved with a minimum amount of ethanol were placed. Then 50ml of chloroform was added, followed by addition of intermediate B (1g,1eq) and the reaction temperature was raised to 50 ℃ and stirred for one day. The reaction solution was then spun dry and dissolved in chloroform, and then the incompletely dissolved solid was filtered off. Methanol was added to the filtrate to precipitate out, and after filtration, c-Au-1 was obtained as a white solid (yield: 53%).

Preparation and characterization of OLED devices:

the OLED device with ITO/NPD (60 nm)/10% (Au-1, or Au-3, or Au-6, or c-Au-1) mCP (45nm)/TPBi (35nm)/LiF (1nm)/Al (150 nm)/cathode was prepared as follows:

a. cleaning the conductive glass substrate, namely cleaning the conductive glass substrate by using various solvents such as chloroform, ketone and isopropanol when the conductive glass substrate is used for the first time, and then carrying out ultraviolet ozone plasma treatment;

b. HTL (60nm), EML (45nm), ETL (35 nm): under high vacuum (1X 10)^-6Mbar, mbar) by thermal evaporation;

c. cathode-LiF/Al (1nm/150nm) in high vacuum (1X 10)^-6Millibar) hot evaporation;

d. encapsulation the devices were encapsulated with uv curable resin in a nitrogen glove box.

The current-voltage-luminance (JVL) characteristics of OLED devices are characterized by characterization equipment, while recording important parameters such as efficiency and external quantum efficiency. Through detection, the maximum external quantum efficiencies of the OLED devices Au-1, Au-3, Au-6 and c-Au-1 are respectively 6.5%, 5.8%, 5.7% and 3.1%.

Further optimization, such as optimization of the device structure, and optimization of the combination of the HTM, ETM, and host material, will further improve the device performance, particularly efficiency, drive voltage, and lifetime.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that the application of the present invention is not limited to the above examples, and that several variations and modifications can be made by those skilled in the art without departing from the spirit of the present invention, which falls into the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

PCT domestic application, the claims have been published.