CN112079873A - Organic electroluminescent material and device - Google Patents

Abstract

The present application relates to organic electroluminescent materials and devices. Organometallic compounds of formula I are provided

Also provided are compositions comprising these organic compoundsFormulations of metal compounds. Further provided are OLEDs and related consumer products utilizing these organometallic compounds.

Description

Organic electroluminescent material and device

CROSS-REFERENCE TO RELATED APPLICATIONS

Priority of united states provisional application No. 62/861,537 filed 2019, 6/14/119 (e) is claimed in this application according to 35u.s.c. § 119(e), the entire contents of which are incorporated herein by reference.

Technical Field

The present disclosure relates generally to organometallic compounds and formulations and various uses thereof, including as emitters in devices such as organic light emitting diodes and related electronic devices.

Background

Photovoltaic devices utilizing organic materials are becoming increasingly popular for a variety of reasons. Many of the materials used to make such devices are relatively inexpensive, and therefore organic photovoltaic devices have the potential for cost advantages over inorganic devices. In addition, the inherent properties of organic materials (e.g., their flexibility) may make them more suitable for particular applications, such as fabrication on flexible substrates. Examples of organic optoelectronic devices include organic light emitting diodes/devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, organic materials may have performance advantages over conventional materials.

OLEDs utilize organic thin films that emit light when a voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for applications such as flat panel displays, lighting and backlighting.

One application of phosphorescent emissive molecules is in full color displays. Industry standards for such displays require pixels adapted to emit a particular color, known as a "saturated" color. In particular, these standards require saturated red, green, and blue pixels. Alternatively, OLEDs can be designed to emit white light. In conventional liquid crystal displays, an absorptive filter is used to filter the emission from a white backlight to produce red, green, and blue emissions. The same technique can also be used for OLEDs. The white OLED may be a single emission layer (EML) device or a stacked structure. Color can be measured using CIE coordinates well known in the art.

Disclosure of Invention

In one aspect, the disclosure provides a compound of formula I

Wherein M is Pd or Pt; A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring; the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring; l is¹、L²、L³And L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof; x¹-X⁶Each independently is C or N; y is¹、Y²、Y³And Y⁴Each independently selected from the group consisting of: a direct bond, O and S; y is¹、Y²、Y³And Y⁴At least two of which are direct bonds; z¹-Z⁴Each independently is C or N; m1, m2, m3, m4 are each independently an integer of 0 or 1; r^A、R^B、R^CAnd R^ZEach independently represents zero substitution, mono substitution, or up to the maximum permissible substitution for its associated ring; r, R' and R^A、R^B、R^CAnd R^ZEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and any two substituents may be joined or fused together to form a ring.

In another aspect, the present disclosure provides a formulation of a compound of formula I as described herein.

In yet another aspect, the present disclosure provides an OLED having an organic layer comprising a compound of formula I as described herein.

In yet another aspect, the present disclosure provides a consumer product comprising an OLED having an organic layer comprising a compound of formula I as described herein.

Drawings

Fig. 1 shows an organic light emitting device.

Fig. 2 shows an inverted organic light emitting device without a separate electron transport layer.

Detailed Description

A. Term(s) for

Unless otherwise specified, the following terms as used herein are defined as follows:

as used herein, the term "organic" includes polymeric materials and small molecule organic materials that may be used to fabricate organic optoelectronic devices. "Small molecule" refers to any organic material that is not a polymer, and "small molecules" may actually be quite large. In some cases, the small molecule may include a repeat unit. For example, the use of long chain alkyl groups as substituents does not remove a molecule from the "small molecule" class. Small molecules can also be incorporated into polymers, for example as pendant groups on the polymer backbone or as part of the backbone. Small molecules can also serve as the core moiety of a dendrimer, which consists of a series of chemical shells built on the core moiety. The core moiety of the dendrimer may be a fluorescent or phosphorescent small molecule emitter. Dendrimers can be "small molecules," and all dendrimers currently used in the OLED art are considered small molecules.

As used herein, "top" means furthest from the substrate, and "bottom" means closest to the substrate. Where a first layer is described as being "disposed" over "a second layer, the first layer is disposed farther from the substrate. Other layers may be present between the first and second layers, unless it is specified that the first layer is "in contact with" the second layer. For example, a cathode may be described as "disposed over" an anode even though various organic layers are present between the cathode and the anode.

As used herein, "solution processable" means capable of being dissolved, dispersed or transported in and/or deposited from a liquid medium in the form of a solution or suspension.

A ligand may be referred to as "photoactive" when it is believed that the ligand contributes directly to the photoactive properties of the emissive material. A ligand may be referred to as "ancillary" when it is believed that the ligand does not contribute to the photoactive properties of the emissive material, but the ancillary ligand may alter the properties of the photoactive ligand.

As used herein, and as will be generally understood by those skilled in the art, if the first energy level is closer to the vacuum energy level, the first "Highest Occupied Molecular Orbital" (HOMO) or "Lowest Unoccupied Molecular Orbital" (LUMO) energy level is "greater than" or "higher than" the second HOMO or LUMO energy level. Since Ionization Potential (IP) is measured as negative energy relative to vacuum level, a higher HOMO level corresponds to an IP with a smaller absolute value (less negative IP). Similarly, a higher LUMO energy level corresponds to an Electron Affinity (EA) with a smaller absolute value (a less negative EA). On a conventional energy level diagram with vacuum levels at the top, the LUMO energy level of a material is higher than the HOMO energy level of the same material. The "higher" HOMO or LUMO energy level appears closer to the top of this figure than the "lower" HOMO or LUMO energy level.

As used herein, and as will be generally understood by those skilled in the art, a first work function is "greater than" or "higher than" a second work function if the first work function has a higher absolute value. Since the work function is typically measured as negative relative to the vacuum level, this means that the "higher" work function is more negative (more negative). On a conventional energy level diagram with vacuum level at the top, the "higher" work function is illustrated as being farther from the vacuum level in the downward direction. Thus, the definitions of HOMO and LUMO energy levels follow a different rule than work functions.

The terms "halo," "halogen," and "halo" are used interchangeably and refer to fluorine, chlorine, bromine, and iodine. The term "acyl" refers to a substituted carbonyl group (C (O) -R_s). The term "ester" refers to a substituted oxycarbonyl group (-O-C (O) -R)_sor-C (O) -O-R_s) A group. The term "ether" means-OR_sA group. The terms "thio" or "thioether" are used interchangeably and refer to-SR_sA group. The term "sulfinyl" refers to-S (O) -R_sA group. The term "sulfonyl" refers to-SO₂-R_sA group. The term "phosphino" refers to-P (R)_s)₃Group, wherein each R_sMay be the same or different. The term "silyl" refers to-Si (R)_s)₃Group, wherein each R_sMay be the same or different. The term "oxyboronyl" refers to-B (R)_s)₂Group or Lewis adduct thereof (R) -B (R)_s)₃Group, wherein R_sMay be the same or different.

In each of the above, R_sMay be hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combinations thereof. Preferred R_sSelected from the group consisting of: alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

The term "alkyl" refers to and includes straight and branched chain alkyl groups. Preferred alkyl groups are those containing from one to fifteen carbon atoms and include methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1-dimethylpropyl, 1, 2-dimethylpropyl, 2-dimethylpropyl, and the like. In addition, the alkyl group may be optionally substituted.

The term "cycloalkyl" refers to and includes monocyclic, polycyclic and spiroalkyl groups. Preferred cycloalkyl groups are those containing 3 to 12 ring carbon atoms and include cyclopropyl, cyclopentyl, cyclohexyl, bicyclo [3.1.1] heptyl, spiro [4.5] decyl, spiro [5.5] undecyl, adamantyl, and the like. In addition, the cycloalkyl group may be optionally substituted.

The term "heteroalkyl" or "heterocycloalkyl" refers to an alkyl or cycloalkyl group, respectively, having at least one carbon atom replaced with a heteroatom. Optionally, the at least one heteroatom is selected from O, S, N, P, B, Si and Se, preferably O, S or N. In addition, heteroalkyl or heterocycloalkyl groups may be optionally substituted. The term "alkenyl" refers to and includes straight and branched chain alkenyl groups. An alkenyl group is essentially an alkyl group that includes at least one carbon-carbon double bond in the alkyl chain. Cycloalkenyl is essentially cycloalkyl that includes at least one carbon-carbon double bond in the cycloalkyl ring. The term "heteroalkenyl" as used herein refers to an alkenyl group having at least one carbon atom replaced with a heteroatom. Optionally, the at least one heteroatom is selected from O, S, N, P, B, Si and Se, preferably O, S or N. Preferred alkenyl, cycloalkenyl or heteroalkenyl groups are those containing from two to fifteen carbon atoms. In addition, the alkenyl, cycloalkenyl or heteroalkenyl groups may be optionally substituted.

The term "alkynyl" refers to and includes straight and branched chain alkynyl groups. Alkynyl is essentially an alkyl group comprising at least one carbon-carbon triple bond in the alkyl chain. Preferred alkynyl groups are those containing from two to fifteen carbon atoms. In addition, alkynyl groups may be optionally substituted. The terms "aralkyl" or "arylalkyl" are used interchangeably and refer to an alkyl group substituted with an aryl group. In addition, the aralkyl group may be optionally substituted.

The term "heterocyclyl" refers to and includes both aromatic and non-aromatic cyclic groups containing at least one heteroatom. Optionally, the at least one heteroatom is selected from O, S, N, P, B, Si and Se, preferably O, S or N. Aromatic heterocyclic groups may be used interchangeably with heteroaryl groups. Preferred non-aromatic heterocyclic groups are heterocyclic groups containing 3 to 7 ring atoms including at least one heteroatom and include cyclic amines such as morpholinyl, piperidinyl, pyrrolidinyl and the like, and cyclic ethers/thioethers such as tetrahydrofuran, tetrahydropyran, tetrahydrothiophene and the like. In addition, the heterocyclic group may be optionally substituted.

The term "aryl" refers to and includes monocyclic aromatic hydrocarbonsRadicals and polycyclic aromatic ring systems. Polycyclic rings can have two or more rings in which two carbons are common to two adjoining rings (the rings are "fused"), wherein at least one of the rings is an aromatic hydrocarbyl, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryls, heterocyclics, and/or heteroaryls. Preferred aryl groups are those containing from six to thirty carbon atoms, preferably from six to twenty carbon atoms, more preferably from six to twelve carbon atoms. Especially preferred are aryl groups having six carbons, ten carbons, or twelve carbons. Suitable aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, perylene,

Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. In addition, the aryl group may be optionally substituted.

The term "heteroaryl" refers to and includes monocyclic aromatic groups and polycyclic aromatic ring systems that include at least one heteroatom. Heteroatoms include, but are not limited to O, S, N, P, B, Si and Se. In many cases O, S or N are preferred heteroatoms. Monocyclic heteroaromatic systems are preferably monocyclic with 5 or 6 ring atoms, and rings may have one to six heteroatoms. A heteropolycyclic system can have two or more rings in which two atoms are common to two adjoining rings (the rings are "fused"), wherein at least one of the rings is heteroaryl, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryls, heterocycles and/or heteroaryls. The heterocyclic aromatic ring system may have one to six heteroatoms per ring of the polycyclic aromatic ring system. Preferred heteroaryl groups are those containing from three to thirty carbon atoms, preferably from three to twenty carbon atoms, more preferably from three to twelve carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolobipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indolizine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furobipyridine, benzothienopyridine, thienobipyridine, benzothienopyridine, and selenenopyridine, preferably dibenzothiophene, and benzothiophene, Dibenzofurans, dibenzoselenophenes, carbazoles, indolocarbazoles, imidazoles, pyridines, triazines, benzimidazoles, 1, 2-azaborines, 1, 3-azaborines, 1, 4-azaborines, borazines, and aza analogs thereof. In addition, the heteroaryl group may be optionally substituted.

Of the aryl and heteroaryl groups listed above, triphenylene, naphthalene, anthracene, dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, pyrazine, pyrimidine, triazine, and benzimidazole are of particular interest, as well as their respective corresponding aza analogues.

The terms alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aralkyl, heterocyclyl, aryl, and heteroaryl, as used herein, are independently unsubstituted or independently substituted with one or more general substituents.

In many cases, typical substituents are selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In some cases, preferred general substituents are selected from the group consisting of: deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, thio, and combinations thereof.

In some cases, preferred general substituents are selected from the group consisting of: deuterium, fluorine, alkyl, cycloalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, aryl, heteroaryl, thio, and combinations thereof.

In other cases, more preferred general substituents are selected from the group consisting of: deuterium, fluoro, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

The terms "substituted" and "substitution" mean that a substituent other than H is bonded to the relevant position, e.g., carbon or nitrogen. For example, when R is¹When representing a single substitution, then one R¹Must not be H (i.e., substituted). Similarly, when R is¹When representing disubstituted, then two R¹Must not be H. Similarly, when R is¹When represents zero or no substitution, R¹For example, it may be hydrogen of available valency for the ring atoms, such as the carbon atom of benzene and the nitrogen atom of pyrrole, or it may be hydrogen of only zero for ring atoms having fully saturated valency, such as the nitrogen atom of pyridine. The maximum number of substitutions possible in a ring structure will depend on the total number of available valences in the ring atoms.

As used herein, "a combination thereof" means that one or more members of the applicable list are combined to form a known or chemically stable arrangement that one of ordinary skill in the art can envision from the applicable list. For example, alkyl and deuterium can be combined to form a partially or fully deuterated alkyl; halogen and alkyl may combine to form haloalkyl substituents; and halogen, alkyl, and aryl groups may be combined to form haloaralkyl groups. In one example, the term substituted includes combinations of two to four of the listed groups. In another example, the term substitution includes a combination of two to three groups. In yet another example, the term substitution includes a combination of two groups. Preferred combinations of substituents are those containing up to fifty atoms other than hydrogen or deuterium, or those containing up to forty atoms other than hydrogen or deuterium, or those containing up to thirty atoms other than hydrogen or deuterium. In many cases, a preferred combination of substituents will include up to twenty atoms that are not hydrogen or deuterium.

The term "aza" in the fragment described herein, i.e., aza-dibenzofuran, aza-dibenzothiophene, etc., means that one or more of the C-H groups in the corresponding aromatic ring can be replaced by a nitrogen atom, for example and without any limitation, azatriphenylene encompasses dibenzo [ f, H ] quinoxaline and dibenzo [ f, H ] quinoline. Other nitrogen analogs of the aza-derivatives described above can be readily envisioned by one of ordinary skill in the art, and all such analogs are intended to be encompassed by the term as set forth herein.

As used herein, "deuterium" refers to an isotope of hydrogen. Deuterated compounds can be readily prepared using methods known in the art. For example, U.S. patent No. 8,557,400, patent publication No. WO 2006/095951, and U.S. patent application publication No. US 2011/0037057 (which are incorporated herein by reference in their entirety) describe the preparation of deuterium substituted organometallic complexes. With further reference to \37154min (Ming Yan) et al, Tetrahedron (Tetrahedron)2015,71,1425-30 and azrote (Atzrodt) et al, german applied chemistry (angelw. chem. int. ed.) (review) 2007,46,7744-65, which are incorporated by reference in their entirety, describe efficient routes for deuteration of methylene hydrogens in benzylamines and replacement of aromatic ring hydrogens with deuterium, respectively.

It is understood that when a molecular fragment is described as a substituent or otherwise attached to another moiety, its name can be written as if it were a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or as if it were an entire molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different named substituents or the manner of linking the fragments are considered equivalent.

In some cases, a pair of adjacent substituents may optionally join or be fused to form a ring. Preferred rings are five-, six-or seven-membered carbocyclic or heterocyclic rings, including both cases where a portion of the ring formed by the pair of substituents is saturated and where a portion of the ring formed by the pair of substituents is unsaturated. As used herein, "adjacent" means that the two substituents involved can be on the same ring next to each other, or on two adjacent rings having two nearest available substitutable positions (e.g., the 2, 2' positions in biphenyl or the 1, 8 positions in naphthalene), so long as they can form a stable fused ring system.

B. Compounds of the present disclosure

In one aspect, the disclosure provides a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹-X⁶each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹-Z⁴each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of the general substituents as described herein; and is

Any two substituents may be joined or fused together to form a ring.

In some embodiments, R, R', R^A、R^B、R^CAnd R^ZEach may independently be hydrogen or a substituent selected from the group consisting of the preferred general substituents defined herein.

In some embodiments, m1 and m3 may each be 0, and m2 and m4 may each be 1. In these embodiments, ring B and ring C may be linked to form a bidentate ligand, and ring a and ring Z may also be linked to form a bidentate ligand. In some embodiments, only one of m1, m2, m3, and m4 may be 0, and the others may each independently be 1. In some embodiments, m1 may be 0, and m2, m3, and m4 may each independently be 1. In some embodiments, m3 may be 0, and m1, m2, and m4 may each independently be 1. In these embodiments, ring A, B, C and Z can be joined to form a tetradentate ligand. In some embodiments, each of m1, m2, m3, and m4 may independently be 1. In these embodiments, ring A, B, C and Z can be joined to form a closed tetradentate ligand.

In some embodiments, moiety Z alone may be a fused ring structure comprising four or more fused heterocyclic or carbocyclic rings, wherein the fused heterocyclic or carbocyclic rings are each independently a 5-or 6-membered ring. In some embodiments, moiety Z is linked to linking group L⁴May be linked to form a fused ring structure comprising four or more fused heterocyclic or carbocyclic rings, wherein the fused heterocyclic or carbocyclic rings are each independently a 5-or 6-membered ring. In some embodiments, the linking group L⁴May be BR, BRR ', NR, PR, CRR ', and SiRR ', wherein R is joined to the moiety Z to form a fused ring structure comprising four or more fused heterocyclic or carbocyclic rings, wherein each of the fused heterocyclic or carbocyclic rings is independently a 5-or 6-membered ring. In some embodiments, the linking group L⁴May be NR or CRR', wherein R is joined to the moiety Z to form a fused ring structure comprising four or more fused heterocyclic or carbocyclic rings, wherein the fused heterocyclic or carbocyclic rings are each independently a 5-or 6-membered ring. In some embodiments, the linking group L⁴May be NR, wherein R is attached to the moiety ZAnd (b) are joined to form a fused ring structure comprising four or more fused heterocyclic or carbocyclic rings, wherein the fused heterocyclic or carbocyclic rings are each independently a 5-or 6-membered ring.

In some embodiments, Y¹、Y²、Y³And Y⁴At least three of which are direct bonds. In some embodiments, Y¹、Y²、Y³And Y⁴All four of (a) are direct bonds. In some embodiments, Y¹And Y⁴Is a direct bond. In some embodiments, Y¹、Y²、Y³And Y⁴Is O or S, and Y¹、Y²、Y³And Y⁴The remainder of which are direct bonds. In some embodiments, Y⁴Is O or S, and Y¹、Y²And Y³Is a direct bond. In some embodiments, Y¹And Y³Is O or S, and Y¹、Y²、Y³And Y⁴The remainder of which are direct bonds.

In some embodiments of the compounds of formula I, the compounds may have the structure of formula II

Wherein at least two of m1, m2, and m3 are each independently 1; and the remaining variables are the same as previously defined.

With respect to formula II, in some embodiments, R^A、R^B、R^CAnd R^ZEach may independently be hydrogen or a substituent selected from the group consisting of the preferred general substituents defined herein.

With respect to formula II, in some embodiments, m1 and m3 can each be 0, and m2 can be 1. In these embodiments, ring B and ring C may be linked to form a bidentate ligand. In some embodiments, only one of m1, m2, and m3 may be 0, and the others may each independently be 1. In some embodiments, m1 may be 0, and m2 and m3 may each independently be 1. In some embodiments, m3 may be 0, and m1 and m2 may each independently be 1. In these embodiments, ring A, B, C and Z can be joined to form a tetradentate ligand. In some embodiments, each of m1, m2, and m3 may independently be 1. In these embodiments, ring A, B, C and Z can be joined to form a closed tetradentate ligand.

With respect to formula II, in some embodiments, rings A, B and C can each independently be a 6-membered aromatic ring. In some embodiments, at least one of rings a and B can be a 5-membered aromatic ring. In some embodiments, if one or more 5-membered rings are present in Z, at least one may be a furan ring. In some embodiments, m1 may be 0. In some embodiments, m2 may be 1, and L²May be a direct bond. In some embodiments, m2 may be 1, and L²May be NR. In some embodiments, m3 may be 1, and L³May be O or CRR'. In some embodiments, Y¹And Y²May be a direct bond. In some embodiments, Y¹And Y²Is O, Y¹And Y²The other of which is a direct bond. In some embodiments, Z¹And Z²May be N. In some embodiments, X¹To X³May each be C. In some embodiments, m2+ m3 may be 2.

With respect to formula II, in some embodiments, R^AAnd R^BEach may independently be hydrogen or a substituent selected from the group consisting of deuterium, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, and combinations thereof. In some embodiments, two R^AThe substituents may be joined together to form a fused 6-membered aromatic ring. In some embodiments, two R^BThe substituents may be joined together to form a fused 6-membered aromatic ring. In some embodiments, Z may comprise four fused rings. In some embodiments, Z may comprise five fused rings. In some embodiments, Z may comprise six fused rings. In some embodiments, Z may comprise seven fused rings. In some embodiments, Z may comprise a 5-membered ring. In some embodiments, Z may comprise two 5-membered rings. In some embodiments, Z may comprise three 6-membered rings. In some embodiments, Z may comprise fourA 6-membered ring. In some embodiments, ring a may be selected from the group consisting of pyridines, imidazoles, and imidazole-derived carbenes.

With respect to formula II, in some embodiments, Z may comprise a structure selected from the group consisting of:

wherein the dashed line marked with the pound (#) indicates a direct bond to ring a; wherein the dotted line marked with an asterisk (—) represents a direct bond to M; and is

Wherein is marked with the number (&) Is represented by a dotted line of³A direct bond of (2).

With respect to formula II, in some embodiments, the compound may comprise a structure selected from the group consisting of:

and is

Wherein R is^FAnd R^GEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R^F、R^Gand R^XEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

In some embodiments, the compound may be selected from the group consisting of compounds k-Si-j; wherein k is an integer of 1 to 3, i is an integer of 1 to 114, and j is an integer of 1 to 44, and for each Si, the compound has a structure defined in the following list 1, wherein X in the structure is O when k ═ 1, and X in the structure is CMe when k ═ 2₂(ii) a And when k is 3, X in the structure is NPh:

wherein for each j, R¹To R⁵The definition is as follows:

in some embodiments, the compound may have the structure of formula III

Wherein:

rings Z1, Z2, Z3, Z4, and Z5 are each independently a 5-or 6-membered carbocyclic or heterocyclic ring, wherein each of the carbocyclic or heterocyclic rings is continuously fused to each other;

R^Z1、R^Z2、R^Z3、R^Z4and R^Z5Each independently is hydrogen or a general substituent as described herein;

the remaining variables are the same as previously defined, an

Any two substituents may be joined or fused to form a ring.

With respect to formula III, in some embodiments, R^Z1、R^Z2、R^Z3、R^Z4、R^Z5、R^A、R^BAnd R^CEach may independently be hydrogen or a substituent selected from the group consisting of the preferred general substituents defined herein.

With respect to formula III, in some embodiments, L³May be selected from the group consisting of O, S, CRR' and NR. In some embodiments, L²May be a single bond or NR. In some embodiments, R and one R^CSubstituents may join to form fused ring moieties. In some embodiments, ring a may be a 5-membered ring. In some embodiments, ring a may be selected from the group consisting of N-heterocyclic carbenes, imidazoles, and pyrazoles. In some embodiments, ring a may be a 6-membered ring. In some embodiments, ring a may be a pyridine ring. In some embodiments, ring B may be a 5-membered ring. In some embodiments, ring B may be selected from the group consisting of N-heterocyclic carbenes, imidazoles, and pyrazoles. In some embodiments, ring B may be a 6-membered ring. In some embodiments, ring B may be a pyridine ring. In some embodiments, ring C may be a 6-membered ring.

With respect to formula III, in some embodiments, ring Z1 can be a 6-membered ring. In some embodiments, rings Z2 and Z4 can be 5-membered rings. In some embodiments, rings Z3 and Z5 can be 6-membered rings. In some embodiments, rings Z2 and Z3 can be 6-membered rings. In some embodiments, ring Z4 can be a 5-membered ring and ring Z5 a 6-membered ring. In some embodiments, rings Z1, Z2, Z3, Z4, and Z5 may each be independentThe ground is aromatic. In the above embodiments, rings Z1, Z2, Z3, Z4, and Z5 may be fused in any chemically feasible manner, even though formula III illustrates linear fusion only as a non-limiting example. More specifically, rings Z1, Z2, Z3, Z4, and Z5 may be fused linearly or nonlinearly. In some embodiments, Z¹And Z²May be N, and Z³And Z⁴May be C. In some embodiments, Z¹Can be C, Z²Is N, and Z³And Z⁴May be C. In some embodiments, X⁴And X⁵May be C. In some embodiments, X⁵Can be N, and X⁴May be C.

With respect to formula III, in some embodiments, two adjacent R are^AThe substituents may join to form a fused ring structure. In some embodiments, two adjacent R^BThe substituents may join to form a fused ring structure. In some embodiments, two adjacent R^CThe substituents may join to form a fused ring structure. In some embodiments, R^Z1、R^Z2、R^Z3、R^Z4、R^Z5、R^A、R^BAnd R^CEach may independently be deuterium, fluoro, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some embodiments, M may be Pt.

With respect to formula III, in some embodiments, the compound may be selected from the group consisting of:

wherein variable R, R^A、R^B、R^C、R^Z1、R^Z3、R^Z5、L²And L³As previously defined.

In some of the embodiments described above, L²And L³Each may independently be O, S, BR, NR, CRR ', or SiRR ', where R and R ' are as previously defined.

With respect to formula III, in some embodiments, the compound may be selected from the group consisting of:

wherein variable R, R^A、R^B、R^CAnd L³As previously defined.

In some of the embodiments described above, L is present at each occurrence³Can be independently O, S, BR, NR, CRR ' or SiRR ', where R and R ' are as previously defined.

In some embodiments, the compound may be selected from the group list 2 consisting of:

in some embodiments, the compound may have a structure according to a formula selected from the group consisting of:

formula IVa

Formula IVb

Formula IVc

Formula IVd

Formula IVe

Formula IVf

And formula IVg

Wherein:

ring Z1', Z3', Z4', Z5', Z6 'and Z7' are each independently a 5-or 6-membered carbocyclic or heterocyclic ring, wherein rings Z1 'to Z7' are fused continuously to each other;

R^Z1'、R^Z3'、R^Z4'、R^Z5'、R^Z6' and R^Z7' are each independently hydrogen or a general substituent as described herein;

the remaining variables are the same as previously defined, an

Any two substituents may be joined or fused together to form a ring.

With respect to the above formula, in some embodiments, R^Z1'、R^Z3'、R^Z4'、R^Z5'、R^Z6'、R^Z7'、R^A、R^BAnd R^CEach may independently be hydrogen or a substituent selected from the group consisting of: deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, thio, and combinations thereof.

With respect to the above formula, in some embodiments, L³May be selected from the group consisting of O, S, CRR' and NR. In some embodiments, L³May be O or NR. In some embodiments, ring a can be a 6-membered aromatic ring. In some embodiments, ring B can be a 6-membered aromatic ring. In some embodiments, ring C can be a 6-membered aromatic ring. In some embodiments, Z¹And Z²May each independently be N. In some embodiments, Z³And Z⁴May each independently be C. In some embodiments, X²、X³、X⁴And X⁹Can be independently of each otherIs C. In some embodiments, ring Z1' can be a 6-membered aromatic ring. In some embodiments, ring Z3' can be a 6-membered aromatic ring. In some embodiments, ring Z4' can be a 5-membered aromatic ring. In some embodiments, ring Z4' may be a furan ring. In some embodiments, ring Z5', ring Z6', and ring Z7' can each independently be a 6-membered aromatic ring. In the above embodiments, rings Z1', Z2', Z3', Z4', Z5', Z6' and Z7' may be fused in any chemically feasible manner, i.e., linear or non-linear.

With respect to the above formula, in some embodiments, two adjacent R' s^AThe substituents may join to form a fused ring structure. In some embodiments, two adjacent R^BThe substituents may join to form a fused ring structure. In some embodiments, two adjacent R^CThe substituents may join to form a fused ring structure. In some embodiments, R^Z1'、R^Z3'、R^Z4'、R^Z5'、R^Z6'、R^Z7'、R^A、R^BAnd R^CEach may independently be deuterium, fluoro, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some embodiments, M may be Pt.

With respect to the above formula, the compound may be selected from the group consisting of:

wherein each R^C' is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

In some of the embodiments described above, L is present at each occurrence³May be O, S, BR, NR, CRR ' or SiRR ', where R and R ' are as previously defined.

With respect to formulae IVa, IVb, IVc, IVd, IVe, IVf, and IVg above, in some embodiments, the compound may be selected from the group consisting of the structures in table 3 below:

wherein variable R, R^A、R^B、R^C、R^Z1'、R^Z3'、R^Z4'、R^Z5'、R^Z6'、R^Z7' and L³As previously defined.

In some of the embodiments described above, L is present at each occurrence³Can be independently O, S, BR, NR, CRR ' or SiRR ', where R and R ' are as previously defined.

In some embodiments, the compound may be selected from the group consisting of compounds Ti-j, where i is an integer from 1 to 72 and j is an integer from 1 to 20, and for each Ti, the compound has the structure defined in the following list 4:

wherein for each j, R¹¹To R¹⁵The definition is as follows:

C. OLEDs and devices of the present disclosure

In another aspect, the present disclosure also provides an OLED device comprising an organic layer containing a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, the organic layer may comprise a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹-X⁶each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹-Z⁴each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of the general substituents as described herein; and any two substituents may be joined or fused together to form a ring.

In some embodiments, the organic layer may be an emissive layer and the compound as described herein may be an emissive dopant or a non-emissive dopant.

In some embodiments, the organic layer may further comprise a host,wherein the host comprises a triphenylene comprising a benzo-fused thiophene or a benzo-fused furan, wherein any substituent in the host is a non-fused substituent independently selected from the group consisting of: c_nH_2n+1、OC_nH_2n+1、OAr₁、N(C_nH_2n+1)₂、N(Ar₁)(Ar₂)、CH＝CH-C_nH_2n+1、C≡CC_nH_2n+1、Ar₁、Ar₁-Ar₂、C_nH_2n-Ar₁Or no substituent, wherein n is 1 to 10; and wherein Ar₁And Ar₂Independently selected from the group consisting of: benzene, biphenyl, naphthalene, triphenylene, carbazole, and heteroaromatic analogs thereof.

In some embodiments, the organic layer may further comprise a host, wherein the host comprises at least one chemical moiety selected from the group consisting of: triphenylene, carbazole, indolocarbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, 5, 9-dioxa-13 b-boronaphtho [3,2,1-de ] anthracene, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, and aza- (5, 9-dioxa-13 b-boronaphtho [3,2,1-de ] anthracene).

In some embodiments, the body may be selected from the group consisting of:

and combinations thereof.

In some embodiments, the organic layer may further comprise a host, wherein the host comprises a metal complex.

In some embodiments, a compound as described herein may be a sensitizer; wherein the device may further comprise a receptor; and wherein the receptor may be selected from the group consisting of: fluorescent emitters, delayed fluorescent emitters, and combinations thereof.

In yet another aspect, the OLEDs of the present disclosure can further comprise an emissive region comprising a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, the emissive region may comprise a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹-X⁶each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹-Z⁴each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of the general substituents as described herein; and any two substituents may be joined or fused together to form a ring.

In yet another aspect, the present disclosure also provides a consumer product comprising an Organic Light Emitting Device (OLED) having an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer can comprise a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, a consumer product includes an Organic Light Emitting Device (OLED) having an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer may comprise a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹-X⁶each independently is C or N;

Y¹、Y²、Y³and Y⁴Each is independentThe locus is selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹-Z⁴each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of the general substituents as described herein; and any two substituents may be joined or fused together to form a ring.

In some embodiments, the consumer product may be one of the following: a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior lighting and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cellular telephone, a tablet, a phablet, a Personal Digital Assistant (PDA), a wearable device, a laptop computer, a digital camera, a video camera, a viewfinder, a microdisplay at a diagonal of less than 2 inches, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall containing multiple displays tiled together, a theater or stadium screen, a phototherapy device, and a sign.

Generally, an OLED comprises at least one organic layer disposed between and electrically connected to an anode and a cathode. When current is applied, the anode injects holes and the cathode injects electrons into the organic layer. The injected holes and electrons each migrate toward the oppositely charged electrode. When an electron and a hole are located on the same molecule, an "exciton," which is a localized electron-hole pair with an excited energy state, is formed. When the exciton relaxes by a light emission mechanism, light is emitted. In some cases, the exciton may be localized on an excimer (eximer) or an exciplex. Non-radiative mechanisms (such as thermal relaxation) may also occur, but are generally considered undesirable.

Several OLED materials and configurations are described in U.S. patent nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated herein by reference in their entirety.

The initial OLEDs used emissive molecules that emit light from a singlet state ("fluorescence"), as disclosed, for example, in U.S. patent No. 4,769,292, which is incorporated by reference in its entirety. Fluorescence emission typically occurs in a time frame of less than 10 nanoseconds.

More recently, OLEDs having emissive materials that emit light from the triplet state ("phosphorescence") have been demonstrated. Baldo et al, "high efficiency Phosphorescent Emission from Organic Electroluminescent Devices" (Nature), 395, 151-154,1998 ("Baldo-I"); and baldo et al, "Very high-efficiency green organic light-emitting devices based on electrophosphorescence (Very high-efficiency green organic light-emitting devices-based on electrophosphorescence)", applied physical promo (appl. phys. lett.), volume 75, stages 3,4-6 (1999) ("baldo-II"), which are incorporated by reference in their entirety. Phosphorescence is described in more detail in U.S. Pat. No. 7,279,704, columns 5-6, which is incorporated by reference.

Fig. 1 shows an organic light emitting device 100. The figures are not necessarily to scale. Device 100 can include substrate 110, anode 115, hole injection layer 120, hole transport layer 125, electron blocking layer 130, emissive layer 135, hole blocking layer 140, electron transport layer 145, electron injection layer 150, protective layer 155, cathode 160, and blocking layer 170. Cathode 160 is a composite cathode having a first conductive layer 162 and a second conductive layer 164. The device 100 may be fabricated by depositing the layers in sequence. The nature and function of these various layers and example materials are described in more detail in U.S. Pat. No. 7,279,704, columns 6-10, which is incorporated by reference.

More instances of each of these layers are available. For example, is flexible anda transparent substrate-anode combination is disclosed in U.S. patent No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is doped with F at a molar ratio of 50:1₄TCNQ m-MTDATA as disclosed in U.S. patent application publication No. 2003/0230980, which is incorporated by reference in its entirety. Examples of luminescent and host materials are disclosed in U.S. Pat. No. 6,303,238 to Thompson et al, which is incorporated by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. patent application publication No. 2003/0230980, which is incorporated by reference in its entirety. U.S. Pat. Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entirety, disclose examples of cathodes comprising composite cathodes having a thin layer of a metal (e.g., Mg: Ag) with an overlying transparent, conductive, sputter-deposited ITO layer. The theory and use of barrier layers is described in more detail in U.S. patent No. 6,097,147 and U.S. patent application publication No. 2003/0230980, which are incorporated by reference in their entirety. Examples of injection layers are provided in U.S. patent application publication No. 2004/0174116, which is incorporated by reference in its entirety. A description of the protective layer may be found in U.S. patent application publication No. 2004/0174116, which is incorporated by reference in its entirety.

Fig. 2 shows an inverted OLED 200. The device includes a substrate 210, a cathode 215, an emissive layer 220, a hole transport layer 225, and an anode 230. The device 200 may be fabricated by depositing the layers in sequence. Because the most common OLED configuration has a cathode disposed above an anode, and device 200 has a cathode 215 disposed below an anode 230, device 200 may be referred to as an "inverted" OLED. Materials similar to those described with respect to device 100 may be used in corresponding layers of device 200. Fig. 2 provides one example of how some layers may be omitted from the structure of device 100.

The simple layered structure illustrated in fig. 1 and 2 is provided by way of non-limiting example, and it is to be understood that embodiments of the present disclosure may be used in conjunction with various other structures. The specific materials and structures described are exemplary in nature, and other materials and structures may be used. Functional OLEDs may be obtained by combining the various layers described in different ways, or the layers may be omitted entirely based on design, performance, and cost factors. Other layers not specifically described may also be included. Materials other than those specifically described may be used. Although many of the examples provided herein describe the various layers as comprising a single material, it is understood that combinations of materials may be used, such as mixtures of hosts and dopants, or more generally, mixtures. Further, the layer may have various sub-layers. The names given to the various layers herein are not intended to be strictly limiting. For example, in device 200, hole transport layer 225 transports holes and injects holes into emissive layer 220, and may be described as a hole transport layer or a hole injection layer. In one embodiment, an OLED may be described as having an "organic layer" disposed between a cathode and an anode. This organic layer may comprise a single layer, or may further comprise multiple layers of different organic materials as described, for example, with respect to fig. 1 and 2.

Structures and materials not specifically described may also be used, such as oleds (pleds) comprising polymeric materials, such as disclosed in U.S. patent No. 5,247,190 to frand (Friend), et al, which is incorporated by reference in its entirety. By way of further example, OLEDs having a single organic layer may be used. The OLEDs may be stacked, for example, as described in U.S. patent No. 5,707,745 to forrister (Forrest) et al, which is incorporated by reference in its entirety. The OLED structure may deviate from the simple layered structure illustrated in fig. 1 and 2. For example, the substrate may include an angled reflective surface to improve out-coupling (out-coupling), such as a mesa structure as described in U.S. Pat. No. 6,091,195 to Foster et al, and/or a pit structure as described in U.S. Pat. No. 5,834,893 to Boolean (Bulovic) et al, which are incorporated by reference in their entirety.

Any of the layers of the various embodiments may be deposited by any suitable method, unless otherwise specified. For organic layers, preferred methods include thermal evaporation, ink jetting (as described in U.S. Pat. Nos. 6,013,982 and 6,087,196, both incorporated by reference in their entirety), organic vapor deposition (OVPD) (as described in U.S. Pat. No. 6,337,102 to Foster et al, both incorporated by reference in their entirety), and deposition by Organic Vapor Jet Printing (OVJP) (as described in U.S. Pat. No. 7,431,968, incorporated by reference in its entirety). Other suitable deposition methods include spin coating and other solution-based processes. The solution-based process is preferably carried out in a nitrogen or inert atmosphere. For other layers, a preferred method includes thermal evaporation. Preferred patterning methods include deposition through a mask, cold welding (as described in U.S. Pat. nos. 6,294,398 and 6,468,819, which are incorporated by reference in their entirety), and patterning associated with some of the deposition methods such as inkjet and Organic Vapor Jet Printing (OVJP). Other methods may also be used. The material to be deposited may be modified to suit the particular deposition method. For example, substituents such as alkyl and aryl groups, branched or unbranched, and preferably containing at least 3 carbons, may be used in small molecules to enhance their ability to undergo solution processing. Substituents having 20 carbons or more may be used, and 3 to 20 carbons is a preferred range. A material with an asymmetric structure may have better solution processibility than a material with a symmetric structure because asymmetric materials may have a lower tendency to recrystallize. Dendrimer substituents may be used to enhance the ability of small molecules to undergo solution processing.

Devices fabricated according to embodiments of the present disclosure may further optionally include a barrier layer. One use of barrier layers is to protect the electrodes and organic layers from damage from exposure to hazardous substances in the environment including moisture, vapor, and/or gas. The barrier layer may be deposited on, under or beside the substrate, electrode, or on any other part of the device, including the edge. The barrier layer may comprise a single layer or multiple layers. The barrier layer may be formed by various known chemical vapor deposition techniques and may include compositions having a single phase and compositions having multiple phases. Any suitable material or combination of materials may be used for the barrier layer. The barrier layer may incorporate an inorganic compound or an organic compound or both. Preferred barrier layers comprise a mixture of polymeric and non-polymeric materials as described in U.S. patent No. 7,968,146, PCT patent application nos. PCT/US2007/023098 and PCT/US2009/042829, which are incorporated herein by reference in their entirety. To be considered a "mixture," the aforementioned polymeric and non-polymeric materials that make up the barrier layer should be deposited under the same reaction conditions and/or simultaneously. The weight ratio of polymeric material to non-polymeric material may be in the range of 95:5 to 5: 95. The polymeric material and the non-polymeric material may be produced from the same precursor material. In one example, the mixture of polymeric material and non-polymeric material consists essentially of polymeric silicon and inorganic silicon.

Devices manufactured according to embodiments of the present disclosure may be incorporated into a wide variety of electronic component modules (or units), which may be incorporated into a wide variety of electronic products or intermediate components. Examples of such electronic products or intermediate components include display screens, lighting devices (e.g., discrete light source devices or lighting panels), etc., which may be utilized by end-user product manufacturers. The electronics module may optionally include drive electronics and/or a power source. Devices manufactured in accordance with embodiments of the present disclosure may be incorporated into a wide variety of consumer products having one or more electronic component modules (or units) incorporated therein. A consumer product comprising an OLED comprising a compound of the present disclosure in an organic layer in the OLED is disclosed. The consumer product shall include any kind of product comprising one or more light sources and/or one or more of some type of visual display. Some examples of such consumer products include flat panel displays, curved displays, computer monitors, medical monitors, televisions, billboards, lights for interior or exterior illumination and/or signaling, heads-up displays, fully or partially transparent displays, flexible displays, rollable displays, foldable displays, stretchable displays, laser printers, telephones, cellular telephones, tablet computers, tablet phones, Personal Digital Assistants (PDAs), wearable devices, laptop computers, digital cameras, video cameras, viewfinders, microdisplays (displays less than 2 inches diagonal), 3-D displays, virtual reality or augmented reality displays, vehicles, video walls containing multiple displays tiled together, theater or stadium screens, phototherapy devices, and signs. Various control mechanisms may be used to control devices made in accordance with the present disclosure, including passive matrices and active matrices. Many of the devices are intended to be used in a temperature range that is comfortable for humans, such as 18 ℃ to 30 ℃, and more preferably at room temperature (20-25 ℃), but can be used outside this temperature range (e.g., -40 ℃ to +80 ℃).

More details regarding OLEDs and the definitions described above can be found in U.S. patent No. 7,279,704, which is incorporated herein by reference in its entirety.

The materials and structures described herein may be applied to devices other than OLEDs. For example, other optoelectronic devices such as organic solar cells and organic photodetectors may employ the materials and structures. More generally, organic devices such as organic transistors may employ the materials and structures.

In some embodiments, the OLED has one or more features selected from the group consisting of: flexible, rollable, foldable, stretchable, and bendable. In some embodiments, the OLED is transparent or translucent. In some embodiments, the OLED further comprises a layer comprising carbon nanotubes.

In some embodiments, the OLED further comprises a layer comprising a delayed fluorescence emitter. In some embodiments, the OLED comprises an RGB pixel arrangement or a white plus color filter pixel arrangement. In some embodiments, the OLED is a mobile device, a handheld device, or a wearable device. In some embodiments, the OLED is a display panel having a diagonal of less than 10 inches or an area of less than 50 square inches. In some embodiments, the OLED is a display panel having a diagonal of at least 10 inches or an area of at least 50 square inches. In some embodiments, the OLED is a lighting panel.

In some embodiments, the compound may be an emissive dopant. In some embodiments, the compounds may produce emission via phosphorescence, fluorescence, thermally activated delayed fluorescence (i.e., TADF, also known as E-type delayed fluorescence, see, e.g., U.S. application No. 15/700,352, which is incorporated herein by reference in its entirety), triplet-triplet annihilation, or a combination of these processes. In some embodiments, the emissive dopant may be a racemic mixture, or may be enriched in one enantiomer. In some embodiments, the compounds may be homoleptic (each ligand is the same). In some embodiments, the compounds may be compounded (at least one ligand being different from the others). In some embodiments, when there is more than one ligand that coordinates to the metal, the ligands may all be the same. In some other embodiments, at least one ligand is different from the other ligands. In some embodiments, each ligand may be different from each other. This is also true in embodiments where the ligand that coordinates to the metal can be linked to other ligands that coordinate to the metal to form a tridentate, tetradentate, pentadentate, or hexadentate ligand. Thus, where the coordinating ligands are linked together, in some embodiments all of the ligands may be the same, and in some other embodiments at least one of the linked ligands may be different from the other ligand(s).

In some embodiments, the compounds may be used as phosphorous photosensitizers in OLEDs, where one or more layers in the OLED contain an acceptor in the form of one or more fluorescent and/or delayed fluorescence emitters. In some embodiments, the compounds may be used as a component of an exciplex to be used as a sensitizer. As a phosphosensitizer, the compound must be capable of energy transfer to the acceptor and the acceptor will emit or further transfer energy to the final emitter. The receptor concentration may range from 0.001% to 100%. The acceptor may be in the same layer as the phosphorous sensitizer or in one or more different layers. In some embodiments, the receptor is a TADF emitter. In some embodiments, the acceptor is a fluorescent emitter. In some embodiments, the emission may be produced by any or all of the sensitizer, the receptor, and the final emitter.

According to another aspect, a formulation comprising a compound described herein is also disclosed.

The OLEDs disclosed herein can be incorporated into one or more of consumer products, electronic component modules, and lighting panels. The organic layer may be an emissive layer, and the compound may be an emissive dopant in some embodiments, while the compound may be a non-emissive dopant in other embodiments.

In yet another aspect of the present invention, a formulation comprising the novel compound disclosed herein is described. The formulation may include one or more of the components disclosed herein selected from the group consisting of: a solvent, a host, a hole injection material, a hole transport material, an electron blocking material, a hole blocking material, and an electron transport material.

The present disclosure encompasses any chemical structure comprising the novel compounds of the present disclosure or monovalent or multivalent variants thereof. In other words, the compounds of the present invention or monovalent or multivalent variants thereof may be part of a larger chemical structure. Such chemical structures may be selected from the group consisting of: monomers, polymers, macromolecules and supramolecules (also known as supramolecules). As used herein, "monovalent variant of a compound" refers to a moiety that is the same as a compound but where one hydrogen has been removed and replaced with a bond to the remainder of the chemical structure. As used herein, "multivalent variants of a compound" refers to moieties that are the same as a compound but where more than one hydrogen has been removed and replaced with one or more bonds to the rest of the chemical structure. In the case of supramolecules, the compounds of the invention may also be incorporated into supramolecular complexes without covalent bonds.

D. Combinations of the compounds of the present disclosure with other materials

Materials described herein as suitable for use in a particular layer in an organic light emitting device can be used in combination with a variety of other materials present in the device. For example, the emissive dopants disclosed herein may be used in conjunction with a wide variety of hosts, transport layers, barrier layers, implant layers, electrodes, and other layers that may be present. The materials described or referenced below are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and one of ordinary skill in the art can readily review the literature to identify other materials that can be used in combination.

a) Conductive dopant:

the charge transport layer may be doped with a conductivity dopant to substantially change its charge carrier density, which in turn will change its conductivity. The conductivity is increased by the generation of charge carriers in the host material and, depending on the type of dopant, a change in the Fermi level of the semiconductor can also be achieved. The hole transport layer may be doped with a p-type conductivity dopant and an n-type conductivity dopant is used in the electron transport layer.

Non-limiting examples of conductivity dopants that can be used in OLEDs in combination with the materials disclosed herein, along with references disclosing those materials, are exemplified below: EP01617493, EP01968131, EP2020694, EP2684932, US20050139810, US20070160905, US20090167167, US2010288362, WO06081780, WO2009003455, WO2009008277, WO2009011327, WO2014009310, US2007252140, US2015060804, US20150123047 and US 2012146012.

b)HIL/HTL：

The hole injection/transport material used in the present disclosure is not particularly limited, and any compound may be used as long as the compound is generally used as the hole injection/transport material. Examples of materials include (but are not limited to): phthalocyanine or porphyrin derivatives; an aromatic amine derivative; indolocarbazole derivatives; a fluorocarbon-containing polymer; a polymer having a conductive dopant; conductive polymers such as PEDOT/PSS; self-assembling monomers derived from compounds such as phosphonic acids and silane derivatives; metal oxide derivatives, e.g. MoO_x(ii) a p-type semiconducting organic compounds, such as 1,4,5,8,9, 12-hexaazatriphenylhexacyano-nitrile; a metal complex; and a crosslinkable compound.

Examples of aromatic amine derivatives for use in HILs or HTLs include, but are not limited to, the following general structures:

Ar¹to Ar⁹Each of which is selected from: a group consisting of aromatic hydrocarbon cyclic compounds such as: benzene, biphenyl, terphenyl, triphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene,

Perylene and azulene; a group consisting of aromatic heterocyclic compounds such as: dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolobipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indolizine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furobipyridine, benzothienopyridine, thienobipyridine, benzoselenenopyridine, and selenenopyridine; and a group consisting of 2 to 10 cyclic structural units which are the same type or different types of groups selected from aromatic hydrocarbon ring groups and aromatic heterocyclic groups and are bonded to each other directly or via at least one 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 aliphatic ring group. Each Ar may be unsubstituted or may be substituted with a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphineRadicals and combinations thereof.

In one aspect, Ar¹To Ar⁹Independently selected from the group consisting of:

wherein k is an integer from 1 to 20; x¹⁰¹To X¹⁰⁸Is C (including CH) or N; z¹⁰¹Is NAr¹O or S; ar (Ar)¹Having the same groups as defined above.

Examples of metal complexes used in HILs or HTLs include, but are not limited to, the following general formulas:

wherein Met is a metal which may have an atomic weight greater than 40; (Y)¹⁰¹-Y¹⁰²) Is a bidentate ligand, Y¹⁰¹And Y¹⁰²Independently selected from C, N, O, P and S; l is¹⁰¹Is an ancillary ligand; k' is an integer value from 1 to the maximum number of ligands that can be attached to the metal; and k' + k "is the maximum number of ligands that can be attached to the metal.

In one aspect, (Y)¹⁰¹-Y¹⁰²) Is a 2-phenylpyridine derivative. In another aspect, (Y)¹⁰¹-Y¹⁰²) Is a carbene ligand. In another aspect, Met is selected from Ir, Pt, Os and Zn. In another aspect, the metal complex has a structure comparable to Fc⁺A minimum oxidation potential in solution of less than about 0.6V for/Fc coupling.

Non-limiting examples of HIL and HTL materials that can be used in OLEDs in combination with the materials disclosed herein, along with references disclosing those materials, are exemplified by the following: CN102702075, DE102012005215, EP01624500, EP0169861, EP01806334, EP01930964, EP01972613, EP01997799, EP02011790, EP02055700, EP02055701, EP1725079, EP2085382, EP2660300, EP650955, JP07-073529, JP2005112765, JP2007091, JP 2008021621687, JP2014-009196, KR 201188898, KR20130077473, TW 201139201139402, US06517957, US 2008220158242, US20030162053, US20050123751 751, US 20060282993, US 200602872 14579, US 201181874874, US20070278938, US 20080014014464 091091091, US20080106190, US 200907192605092385, US 12460352009071794392604335200356371798, WO 20120020120020135200353141563543544354435443544354435443544354435443544354435443544354435646, WO 200200352003520035563256325632563256325646, WO 20035200352003520035200435443544354435443544354435443544354435443544354435646, WO 200605646, WO 200605632563256325632563256325646, WO 2002002002002002002002002002002002002002004356325632563256325632563256325632563256325632563256325632563256325632567, WO 2004354435443435632563256325632563256325632563256325632563243544354434354435443544354435443544354435443544354435443541, WO 200200200200200200200200200200200200200200200200200200.

c)EBL：

An Electron Blocking Layer (EBL) may be used to reduce the number of electrons and/or excitons that leave the emissive layer. The presence of such a barrier layer in a device may result in substantially higher efficiency and/or longer lifetime compared to a similar device lacking a barrier layer. In addition, blocking layers can be used to limit the emission to the desired area of the OLED. In some embodiments, the EBL material has a higher LUMO (closer to the vacuum level) and/or higher triplet energy than the emitter closest to the EBL interface. In some embodiments, the EBL material has a higher LUMO (closer to the vacuum level) and/or higher triplet energy than one or more of the bodies closest to the EBL interface. In one aspect, the compound used in the EBL contains the same molecule or the same functional group as used in one of the hosts described below.

d) A main body:

the light-emitting layer of the organic EL device of the present disclosure preferably contains at least a metal complex as a light-emitting material, and may contain a host material using the metal complex as a dopant material. Examples of the host material are not particularly limited, and any metal complex or organic compound may be used as long as the triplet energy of the host is larger than that of the dopant. Any host material may be used with any dopant so long as the triplet criteria are met.

Examples of the metal complex used as the host preferably have the following general formula:

wherein Met is a metal; (Y)¹⁰³-Y¹⁰⁴) Is a bidentate ligand, Y¹⁰³And Y¹⁰⁴Independently selected from C, N, O, P and S; l is¹⁰¹Is another ligand; k' is an integer value from 1 to the maximum number of ligands that can be attached to the metal; and k' + k "is the maximum number of ligands that can be attached to the metal.

In one aspect, the metal complex is:

wherein (O-N) is a bidentate ligand having a metal coordinated to the O and N atoms.

In another aspect, Met is selected from Ir and Pt. In another aspect, (Y)¹⁰³-Y¹⁰⁴) Is a carbene ligand.

In one aspect, the host compound contains at least one selected from the group consisting of: a group consisting of aromatic hydrocarbon cyclic compounds such as: benzene, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, perylene,

Perylene and azulene; a group consisting of aromatic heterocyclic compounds such as: dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolobipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indolizine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furobipyridine, benzothienopyridine, thienobipyridine, benzoselenenopyridine, and selenenopyridine; and a group consisting of 2 to 10 cyclic structural units which are the same type or different types of groups selected from aromatic hydrocarbon ring groups and aromatic heterocyclic groups and are bonded to each other directly or via at least one 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 aliphatic ring group. Each option in each group may be unsubstituted or may be substituted with a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkylA group, an aralkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carboxylic acid, an ether, an ester, a nitrile, an isonitrile, a thio group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

In one aspect, the host compound contains at least one of the following groups in the molecule:

wherein R is¹⁰¹Selected from the group consisting of: hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof, and when it is aryl or heteroaryl, it has a similar definition to Ar mentioned above. k is an integer from 0 to 20 or from 1 to 20. X¹⁰¹To X¹⁰⁸Independently selected from C (including CH) or N. Z¹⁰¹And Z¹⁰²Independently selected from NR¹⁰¹O or S.

Non-limiting examples of host materials that can be used in OLEDs in combination with the materials disclosed herein are exemplified below, along with references disclosing those materials: EP2034538, EP2034538A, EP2757608, JP2007254297, KR20100079458, KR20120088644, KR20120129733, KR20130115564, TW201329200, US20030175553, US20050238919, US20060280965, US20090017330, US20090030202, US20090167162, US20090302743, US20090309488, US20100012931, US20100084966, US20100187984, US2010187984, US2012075273, US2012126221, US2013009543, US2013105787, US2013175519, US 001446, US 20148301503, US20140225088, US2014034914, US7154114, WO2001039234, WO 2004093203203203207, WO 2005014545454545452009020090455646, WO 2002012009020120090201902019072201200907220120020190722012002012002016072201200201200201200201607246, WO 20120020120020160722012002016072201200201200201607246, WO 200201200201200201200201200201200201200201200907220020120020120020120020120020120020120090729, WO 200201200201200201200201200201200201200201200201200201200201200201200201200201200201200201200201200200200201200201200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200,

e) other emitters:

one or more other emitter dopants may be used in combination with the compounds of the present invention. Examples of the other emitter dopant are not particularly limited, and any compound may be used as long as the compound is generally used as an emitter material. Examples of suitable emitter materials include, but are not limited to, compounds that can produce emission via phosphorescence, fluorescence, thermally activated delayed fluorescence (i.e., TADF, also known as E-type delayed fluorescence), triplet-triplet annihilation, or a combination of these processes.

Non-limiting examples of emitter materials that can be used in OLEDs in combination with the materials disclosed herein, along with references disclosing those materials, are exemplified below: CN103694277, CN1696137, EB01238981, EP01239526, EP01961743, EP1239526, EP1244155, EP1642951, EP1647554, EP1841834, EP1841834B, EP2062907, EP2730583, JP 201207440263, JP4478555, KR1020090133652, KR20120032054, KR20130043460, TW201332980, US0669959, US 200100916520, US20010019782, US20020034656, US 20030068568526, US20030072964, US 2003013865657, US 200501787878788, US 20020020020020120044673, US2005123791, US 2006052449 449, US20060008670, US20060065890, US 601696, US 6016016016012006012016016310204659, US 2012002012002012002012002012000477817781979, WO 20020120020120020120020020020020020020004778177819748, US 20120020020004779, WO 200200200201200201200200200200200201200778177819748, US 20020120004779, US 20120020120020120020120020020120020020020004779, US 2002012002002002002002002002002002002002002002002002002002012000477819748, US 200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200779, US 200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200779, US 200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200200779, US 20020020020020020020020020020020020020020020020020020020120020120020020020020020020020020020020020020020020020020020020020020020020043979, US 20020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020043979, US 20020020020020020020020020020020020020020020020020020020020020020020020020020020020043979, US 20020020020120020120020020020020020020020020020020020020020020020043979, US 20020020020020020020020020020020020120020120020020020020020020020020020020020020020020020020020020020020020020020020020020120020020020020020020020020020020020020020020020043979, US 20020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020020120020120020120020120043979, US 200200200200200200200200200200200200200200200200200200200200200200200200200200200, WO2012020327, WO2012163471, WO2013094620, WO2013107487, WO2013174471, WO2014007565, WO2014008982, WO2014023377, WO2014024131, WO2014031977, WO2014038456, WO 2014112450.

f)HBL：

Hole Blocking Layers (HBLs) may be used to reduce the number of holes and/or excitons that leave the emissive layer. The presence of such a barrier layer in a device may result in substantially higher efficiency and/or longer lifetime compared to a similar device lacking a barrier layer. In addition, blocking layers can be used to limit the emission to the desired area of the OLED. In some embodiments, the HBL material has a lower HOMO (farther from the vacuum level) and/or higher triplet energy than the emitter closest to the HBL interface. In some embodiments, the HBL material has a lower HOMO (farther from the vacuum level) and/or higher triplet energy than one or more of the hosts closest to the HBL interface.

In one aspect, the compound used in the HBL contains the same molecule or the same functional group as used for the host described above.

In another aspect, the compound used in HBL contains in the molecule at least one of the following groups:

wherein k is an integer from 1 to 20; l is¹⁰¹Is another ligand, and k' is an integer of 1 to 3.

g)ETL：

The Electron Transport Layer (ETL) may include a material capable of transporting electrons. The electron transport layer may be intrinsic (undoped) or doped. Doping may be used to enhance conductivity. Examples of the ETL material are not particularly limited, and any metal complex or organic compound may be used as long as it is generally used to transport electrons.

In one aspect, the compound used in the ETL contains in the molecule at least one of the following groups:

wherein R is¹⁰¹Selected from the group consisting of: hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof, which when aryl or heteroaryl has a similar definition to Ar described above. Ar (Ar)¹To Ar³Have similar definitions as Ar mentioned above. k is an integer of 1 to 20. X¹⁰¹To X¹⁰⁸Selected from C (including CH) or N.

In another aspect, the metal complex used in the ETL contains (but is not limited to) the following general formula:

wherein (O-N) or (N-N) is a bidentate ligand having a metal coordinated to atom O, N or N, N; l is¹⁰¹Is another ligand; k' is 1 to the maximum that can be connected to metalInteger values for the number of ligands.

Non-limiting examples of ETL materials that can be used in an OLED in combination with the materials disclosed herein, along with references disclosing those materials, are exemplified as follows: CN103508940, EP01602648, EP01734038, EP01956007, JP2004-022334, JP2005149918, JP2005-268199, KR0117693, KR20130108183, US20040036077, US20070104977, US2007018155, US20090101870, US20090115316, US20090140637, US 2009017959554, US2009218940, US2010108990, US2011156017, US2011210320, US2012193612, US2012214993, US 20140142014014925, US 201401492014927, US 2014028450284580, US 5666612, US 1508431, WO 200306093060979256, WO2007111263, WO2009148269, WO2010067894, WO2010072300, WO 201107070, WO 105373, WO 201303017, WO 201314545477, WO 2014545667, WO 201104376, WO2014104535, WO 2014535,

h) charge Generation Layer (CGL)

In tandem or stacked OLEDs, CGL plays a fundamental role in performance, consisting of an n-doped layer and a p-doped layer for injecting electrons and holes, respectively. Electrons and holes are supplied by the CGL and the electrodes. Electrons and holes consumed in the CGL are refilled by electrons and holes injected from the cathode and anode, respectively; subsequently, the bipolar current gradually reaches a steady state. Typical CGL materials include n and p conductivity dopants used in the transport layer.

In any of the above-mentioned compounds used in each layer of the OLED device, the hydrogen atoms may be partially or fully deuterated. Thus, any of the specifically listed substituents, such as (but not limited to) methyl, phenyl, pyridyl, and the like, can be in their non-deuterated, partially deuterated, and fully deuterated forms. Similarly, substituent classes (such as, but not limited to, alkyl, aryl, cycloalkyl, heteroaryl, etc.) can also be non-deuterated, partially deuterated, and fully deuterated forms thereof.

It should be understood that the various embodiments described herein are by way of example only and are not intended to limit the scope of the invention. For example, many of the materials and structures described herein may be substituted with other materials and structures without departing from the spirit of the invention. The invention as claimed may thus comprise variations of the specific examples and preferred embodiments described herein, as will be apparent to those skilled in the art. It should be understood that various theories as to why the invention works are not intended to be limiting.

Experiment of

Synthesis of examples of the invention

Examples of the invention

Flow path

Examples of the invention

Step 1: synthesis of 1- (4-methoxy-2-nitrophenoxy) naphthalene: in a 2L 3-neck round-bottom flask equipped with an air condenser on top, naphthalen-1-ol (21.06g, 146mmol) was dissolved in anhydrous dimethylsulfoxide (500mL) under an inert atmosphere. Next, potassium carbonate (40.4g, 292mmol) and 1-fluoro-4-methoxy-2-nitrobenzene (25.0g, 146mmol) were added all at once and the reaction mixture was stirred at 100 ℃ for 2 hours. The reaction mixture was allowed to cool to room temperature and poured into an ice/water mixture. A brown solid precipitated out, which was subsequently filtered off and washed with water. The resulting brown solid was wet milled with diethyl ether until the color changed from brown to yellow. The solid was finally dried under vacuum to yield (42g, 141mmol, 96%).

Step 2: synthesis of 8-methoxy-10-nitronaphtho [1,2-b ] benzofuran: 1- (4-methoxy-2-nitrophenoxy) naphthalene (21g, 71.1mmol), potassium carbonate (3.94g, 28.4mmol) and palladium (II) acetate (3.2g, 14.2mmol) were suspended in pivalic acid (80mL) in a 250mL round-bottom flask and stirred at 120 ℃ for 72 hours under an open air atmosphere. The mixture was cooled to room temperature, transferred to a 3L round bottom flask, and dissolved in DCM (1L). 2M sodium hydroxide (1L) was then added with stirring and the resulting suspension was filtered off through a kieselguhr road-size. The organic phase was separated, washed with brine, dried over magnesium sulfate and the solvent removed. The resulting crude mixture was purified by chromatography using a mixture of isohexane/dichloromethane to give a yellow solid (8.5g, 28.7mmol, 40.3%).

And step 3: synthesis of 8-methoxynaphtho [1,2-b ] benzofuran-10-amine: 8-methoxy-10-nitronaphtho [1,2-b ] benzofuran (25.0g, 85mmol) was placed in a round bottom flask topped with an air condenser to dissolve and then in hot anhydrous 1, 4-dioxane (240mL) until a clear solution was obtained. Water (60mL), iron powder (36.7g, 565mmol) and ammonium chloride (30.5g, 571mmol) were then added and the mixture was stirred at 100 ℃ for 18 h. The reaction mixture was allowed to cool to room temperature and filtered through a celite pad. The solvent was removed in vacuo and the resulting crude mixture was partitioned between 2-methyltetrahydrofuran (200mL) and water (200 mL). The organics were separated, dried over magnesium sulfate, and the solvent was removed to give a brown solid. Final wet milling with methanol gave a yellow solid (14g, 53.2mmol, 63%).

And 4, step 4: synthesis of 10-bromo-8-methoxynaphtho [1,2-b ] benzofuran: copper (II) bromide (1.272g, 5.70mmol) was added to a stirred solution of hydrated 4-methylbenzenesulfonic acid (13.00g, 68.4mmol), tert-butyl nitrite (7.05g, 68.4mmol), 8-methoxynaphtho [1,2-b ] benzofuran-10-amine (15g, 57.0mmol) and tetrabutylammonium bromide (22.04g, 68.4mmol) in anhydrous acetonitrile (500mL) in a 3-neck round-bottom flask under an inert atmosphere. The mixture was stirred at room temperature for 1 hour. The solvent was then removed in vacuo and the resulting mixture was partitioned between 2-methyltetrahydrofuran (200mL) and water (200 mL). The organics were separated, dried over magnesium sulfate, and the solvent was removed to give a brown oil. The crude mixture was purified by chromatography using a mixture of isohexane/tetrahydrofuran to give a brown solid which was subsequently wet-milled with methanol to give a white solid (11g, 33.6mmol, 57%).

And 5: synthesis of 2- (8-methoxynaphtho [1,2-b ]]Benzofuran-10-yl) -4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan: in a 1L three-necked round-bottom flask equipped with a reflux condenser at the top, potassium acetate (13.5g, 138mmol), 10-bromo-8-methoxynaphtho [1,2-b ] were placed]Benzofuran (15g, 45.8mmol), 1' -bis (diphenylphosphino) ferrocene-palladium (II) dichloride dichloromethane complex (3.73g, 4.58mmol) and bis (pinacol) diboron (23.28g, 92mmol) were dissolved in anhydrous dioxane (300 mL). N for the mixture₂Bubbling was carried out for 30 minutes, and the reaction was stirred at 100 ℃ for 4 hours. The crude reaction product was then partitioned between ethyl acetate (300mL) and water (300mL), the organics were separated, washed with brine (2X 200mL), dried over magnesium sulfate and the solvent removed. The crude product was purified by chromatography using a mixture of isohexane/ethyl acetate to give a yellow solid (12g, 45.8mmol, 70%).

Step 6: synthesis of 4- (tert-butyl) -2- (8-methoxynaphtho [1,2-b ]]Benzofuran-10-yl) pyridine: in a 500mL round-bottom flask equipped with an air condenser at the top, sodium carbonate (8.5g, 80mmol), 2- (8-methoxynaphtho [1,2-b ] were placed]Benzofuran-10-yl) -4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan (12g, 32.1mmol) and 4- (tert-butyl) -2-chloropyridine (10.88g, 64.1mmol) were dissolved in a mixture of 1, 4-dioxane, water (250mL) (4: 1). N for the mixture₂Bubbling for 15 min, followed by tetrakis (triphenylphosphine) palladium (0) (3.71g, 3.21mmol) and the mixture with N₂Bubbling was continued for another 15 minutes. The reaction was stirred at 100 ℃ for 18 hours. The crude reaction product was partitioned between ethyl acetate (300mL) and brine (300mL), the organics were separated, washed with brine (2X 300mL), and dried over magnesium sulfateDried and the solvent removed. The crude mixture was purified by chromatography using a mixture of isohexane/ethyl acetate to give a white solid (7.5g, 19.66mmol, 61.3%).

And 7: synthesis of 10- (4- (tert-butyl) pyridin-2-yl) naphtho [1,2-b ] benzofuran-8-ol: in a 250mL round bottom flask equipped with an air condenser at the top, 4- (tert-butyl) -2- (8-methoxynaphtho [1,2-b ] benzofuran-10-yl) pyridine (7.5g, 19.66mmol) and pyridine hydrochloride (11.36g, 98mmol) were combined. The mixture was stirred at 190 ℃ for 3 hours under an air atmosphere. It was allowed to cool to room temperature and the pH was adjusted to 7 using 2M sodium hydroxide solution. Partitioned between ethyl acetate (100mL) and water (100 mL). The organics were separated, dried over magnesium sulfate, and the solvent was removed to give a black solid. The crude mixture was purified by chromatography using a mixture of isohexane/acetone to give a yellow solid (2.1g, 6mmol, 29%).

And 8: synthesis of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((10- (4- (tert-butyl) pyridin-2-yl) naphtho [1,2-b ] benzofuran-8-yl) oxy) -9H-carbazole: copper (I) iodide (0.038g, 0.197mmol, 0.06 equiv.) was added to a mixture of 10- (4- (tert-butyl) pyridin-2-yl) -naphtho [1,2-b ] benzofuran-8-ol (1.448g, 3.94mmol, 1.2 equiv.), 9- (4- (tert-butyl) -pyridin-2-yl) -2-iodo-9H-carbazole (1.4g, 3.28mmol, 1.0 equiv.), picolinic acid (0.049g, 0.394mmol, 0.12 equiv.), and tripotassium phosphate monohydrate (1.464g, 6.90mmol, 2.1 equiv.) in dimethylsulfoxide (10 mL). The reaction mixture was heated at 120 ℃ for 2 hours. LCMS analysis indicated 96.4% conversion to the desired product. The reaction mixture was cooled to room temperature and diluted with water (5 mL). The resulting solid was filtered and washed with methanol (5 × 5mL) to give 9- (4- (tert-butyl) pyridin-2-yl) -2- ((10- (4- (tert-butyl) pyridin-2-yl) naphtho [1,2-b ] benzofuran-8-yl) oxy) -9H-carbazole as an off-white solid (1.9g, 87% yield, 98.5% LC purity).

And step 9: the embodiment of the invention comprises the following steps: a mixture of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((10- (4- (tert-butyl) pyridin-2-yl) naphtho [1,2-b ] benzofuran-8-yl) oxy) -9H-carbazole (1.8g, 2.70mmol, 1.0 equiv.) and platinum (II) acetylacetonate (1.06g, 2.70mmol, 1.0 equiv.) in acetic acid (10mL) was bubbled with nitrogen for 10 minutes, followed by heating to reflux. After 40 hours, the reaction mixture was cooled to room temperature and diluted with water (10 mL). The resulting solid was filtered and washed with water (2X 2mL) and methanol (5mL) to give a brown solid. The crude product was purified on an interchem automatic chromatography system (80g silica plug) eluting with a gradient of 0 to 50% dichloromethane/heptane. The product was wet milled with methanol containing about 10% dichloromethane (about 10mL) to give 9- (4- (tert-butyl) pyridin-2-yl) -2- ((10- (4- (tert-butyl) pyridin-2-yl) naphtho [1,2-b ] benzofuran-8-yl) oxy) -9H-carbazole as an orange solid (1.7g, 73.2% yield, 99.7% UPLC purity).

Comparative examples of Synthesis

Flow path

Comparative example

Step 1. Synthesis of 3 '-chloro-2', 5 '-difluoro- [1, 1' -biphenyl]-2-alcohols: a suspension of 1-bromo-3-chloro-2, 5-difluorobenzene (10.0g, 44.0mmol), (2-hydroxyphenyl) boronic acid (6.67g, 48.4mmol) and potassium carbonate (15.2g, 110mmol) in 1, 4-dioxane (100mL) and water (100mL) was bubbled with nitrogen for 10 minutes. Adding Pd (PPh)₃)₄(1.52g, 1.32mmol) and the reaction mixture was stirred at 105 ℃ for 6 hours. The reaction mixture was cooled to room temperature, poured into ice-water (500mL), and extracted with EtOAc (3X 300 mL). The combined organics were washed with brine (200mL) and MgSO₄Dried, filtered and pre-adsorbed onto silica gel. Purification by flash column chromatography (silica gel, 330g short column, solid support, 0-20% EtOAc/isohexane) afforded 3 '-chloro-2', 5 '-difluoro- [1, 1' -biphenyl as a colorless oil]-2-ol (9.65g, 39.6mmol, 90% yield, > 98% UPLC purity).

Step 2 synthesis of 4-chloro-2-fluorodibenzo [ b, d ] furan: a suspension of 3 '-chloro-2', 5 '-difluoro- [1, 1' -biphenyl ] -2-ol (16.0g, 66.5mmol) and potassium carbonate (13.8g, 100mmol) in NMP (200mL) was stirred under nitrogen at 150 ℃ for 4 hours. The reaction mixture was cooled to room temperature and poured into ice water (800mL) and stirred for 30 minutes. The precipitate was collected by filtration and the filter cake was rinsed with water (500 mL). The wet cake was dissolved in DCM (800mL), filtered through a short pad of silica and concentrated to give 4-chloro-2-fluorodibenzo [ b, d ] furan as a white solid (11.5g, 51.0mmol, 77% yield, 98% UPLC purity).

And 3, step 3 and step 4: synthesis of 4- (tert-butyl) -2- (2-fluorodibenzo [ b, d ]]Furan-4-yl) pyridine: potassium acetate (18.9g, 193mmol), bis (pinacol) diboron (29.4g, 116mmol), XPhos (2.94g, 6.16mmol) and 4-chloro-2-fluorodibenzo [ b, d ]]A suspension of furan (2) (17.0g, 77mmol) in 1, 4-dioxane (170mL) was sparged with nitrogen for 10 minutes. Adding Pd₂(dba)₃(2.82g, 3.08mmol) and the reaction mixture was stirred at 100 ℃ for 3 h. The reaction was cooled to room temperature, diluted with water (300mL), and extracted with EtOAc (500mL, followed by 2X 300 mL). The combined organics were washed with brine (500mL) and MgSO₄Dried, filtered and concentrated. The residue was dissolved in a mixture of 1, 4-dioxane (170mL) and water (170mL), followed by addition of 4- (tert-butyl) -2-chloropyridine (13.7g, 81.0mmol) and K₃PO₄(40.9g, 193 mmol). The resulting mixture was bubbled with nitrogen for 10 minutes, and Pd (PPh) was added₃)₄(3.56g, 3.08 mmol). The reaction mixture was stirred at 100 ℃ for 16 h, cooled to room temperature, poured into ice water (500mL), and extracted with EtOAc (3X 500 mL). The combined organics were washed with water (300mL) and brine (300mL), then concentrated. Purification by flash chromatography (silica gel, 330g short column, 0-30% EtOAc/isohexane) afforded 4- (tert-butyl) -2- (2-fluorodibenzo [ b, d ] as an off-white solid]Furan-4-yl) pyridine (22.5g, 66.9mmol, 87% yield, 97% UPLC purity).

Step 5. Synthesis of 4- (tert-butyl) -2- (2-methoxydibenzo [ b, d ] furan-4-yl) pyridine: a suspension of 4- (tert-butyl) -2- (2-fluorodibenzo [ b, d ] furan-4-yl) pyridine (3) (23.5g, 73.6mmol) and sodium methoxide (15.9g, 294mmol) in anhydrous DMSO (150mL) was stirred at 100 ℃ under nitrogen for 18 h. The reaction mixture was cooled to room temperature, poured into ice water (500mL), and extracted with EtOAc (3X 500 mL). The combined organics were washed with water (200mL) and brine (300mL), then concentrated. Purification by flash chromatography (silica gel, 330g short column, solid supported on silica, 0-20% EtOAc/isohexane) afforded 4- (tert-butyl) -2- (2-methoxydibenzo [ b, d ] furan-4-yl) pyridine (16.5g, 49.3mmol, 67% yield, 98% HPLC purity) as a white solid.

Step 6 Synthesis of 4- (4-tert-butyl) pyridin-2-yl) dibenzo [ b, d ] furan-2-ol: sodium ethanethiolate (2.16g, 25.65mmol, 3.4 equivalents) was added to a solution of 4- (tert-butyl) -2- (2-methoxydibenzo [ b, d ] furan-4-yl) pyridine (2.5g, 7.54mmol, 1.0 equivalents) in N-methyl-2-pyrrolidone (10mL), and the reaction mixture was heated at 100 ℃. After 2 hours a large amount of solid formed and stirring with the stirring bar was stopped. The reaction mixture was cooled to room temperature, followed by addition of ethyl acetate (50mL) and saturated aqueous ammonium chloride (50 mL). The separated organic layer was washed with saturated brine (50mL), dried over sodium sulfate (50g), filtered and concentrated under reduced pressure. The residue was purified on an interchem automated system (80g silica gel short column) eluting with 0-70% ethyl acetate/heptane to give 4- (4- (tert-butyl) pyridin-2-yl) -dibenzo [ b, d ] furan-2-ol as a white solid (1.52g, 64% yield, 98% LC purity).

Step 7. synthesis of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((4- (4- (tert-butyl) pyridin-2-yl) dibenzo [ b, d ] -furan-2-yl) oxy) -9H-carbazole: copper (I) iodide (0.037g, 0.194mmol, 0.06 equiv.) was added to a mixture of 4- (4- (tert-butyl) pyridin-2-yl) dibenzo- [ b, d ] furan-2-ol (1.233g, 3.88mmol, 1.2 equiv.), 9- (4- (tert-butyl) pyridin-2-yl) -2-iodo-9H-carbazole (1.38g, 3.24mmol, 1.0 equiv.), picolinic acid (0.048g, 0.388mmol, 0.12 equiv.), and potassium phosphate (1.443g, 6.80mmol, 2.1 equiv.) in dimethylsulfoxide (12 mL). The reaction mixture was heated at 120 ℃ for 2 hours. LCMS analysis showed the reaction mixture to contain 70% product, 15% unreacted and 15% unknown impurities. 4- (4- (tert-butyl) -pyridin-2-yl) dibenzo [ b, d ] furan-2-ol (0.2g, 0.63mmol, 0.2 equiv.) was added and heating continued without further reaction taking place. The reaction mixture was cooled to room temperature, followed by addition of ethyl acetate (50mL) and saturated brine (50 mL). The organic layer was separated, and the aqueous layer was extracted with ethyl acetate (50 mL). The combined organic layers were washed with saturated brine (50mL), dried over sodium sulfate (50g), filtered and concentrated under reduced pressure. The residue was purified on an interchem automated system (120g silica gel short column) eluting with a gradient of 0-50% ethyl acetate/heptane to afford 9- (4- (tert-butyl) pyridin-2-yl) -2- ((4- (4- (tert-butyl) -pyridin-2-yl) dibenzo [ b, d ] furan-2-yl) oxy) -9H-carbazole (1.33g, 67% yield, 98.5% LC purity) as a white solid.

Step 8. synthesis of platinum complex of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((4- (4- (tert-butyl) pyridin-2-yl) dibenzo [ b, d ] furan-2-yl) oxy) -9H-carbazole: a mixture of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((4- (4- (tert-butyl) pyridin-2-yl) dibenzo [ b, d ] furan-2-yl) oxy) -9H-carbazole (1.33g, 2.16mmol, 1.0 equiv.) and platinum (II) acetylacetonate (0.85g, 2.16mmol, 1.0 equiv.) in acetic acid (10mL) was bubbled with nitrogen for 10 minutes, followed by heating to reflux. The reaction mixture was cooled to room temperature and water (10mL) was added. The solid was filtered and washed sequentially with water (2X 2mL) and methanol (3X 1mL) to give a brown solid. The crude product was purified on an interchem automated system (80g silica plug) eluting with a gradient of 0-70% dichloromethane/heptane. The recovered material was wet milled with dichloromethane/methanol to give the platinum complex of 9- (4- (tert-butyl) pyridin-2-yl) -2- ((4- (4- (tert-butyl) pyridin-2-yl) dibenzo [ b, d ] furan-2-yl) -oxy) -9H-carbazole as a yellow solid (0.45g, 26% yield, 99.7% UPLC purity).

TABLE 1 sublimation Profile

Inventive examples successfully sublime at a temperature of 350 ℃. Whereas the comparative example decomposed during sublimation at a temperature of 330 ℃. It was unexpectedly found that the inventive examples have better thermal properties than the comparative examples. Since the comparative examples failed to sublime, OLEDs could not be fabricated using the comparative example compounds, and there were no device test results for the comparative examples.

Example of the device

All example devices were operated by high vacuum (<10^-7Torr) thermal evaporation. The anode electrode is

Indium Tin Oxide (ITO). The cathode is sequentially formed by

Liq (8-hydroxyquinoline lithium) and

al of (1). All devices were capped immediately after manufacture with epoxy-sealed glass in a nitrogen glove box (<1ppm of H₂O and O₂) The package is packaged, and a moisture absorbent is filled in the package. The organic stack of the device example consisted of the following in order from the ITO surface:

HAT-CN as a Hole Injection Layer (HIL);

the HTM acts as a Hole Transport Layer (HTL);

the EBM as an Electron Blocking Layer (EBL) having a thickness of

The emission layer (EML). The emissive layer contains a ratio of 6: 4H-host (H1): E-host (H2) and 12 wt% green emitter.

Liq (lithium 8-quinolinolato) of (2) was doped with 40% ETM as ETL. The device structure is shown in table 2 below. Table 2 shows an exemplary device structure. The chemical structure of the device material is shown below.

After manufacture, the devices have been measured for EL, JVL and at DC 80mA/cm²The life test was performed. Assuming an acceleration factor of 1.8, an LT95 of 1,000 nits was calculated from the 80mA/cm2 LT data. The device performance is shown in table 3 below.

TABLE 2-exemplary device configuration

Table 3: device performance

For emissive transition metal chelates, a typical framework comprises at least one bidentate chelate as the chromophore. There is growing interest in using multidentate chromophores (see conventional bidentate chromatography) to extend conjugation and enhance the stabilization properties of metal chelates. This strategy seems quite successful for platinum (II) systems, where chelating agents are used in the application of OLED materials; by using their square planar coordination geometry. Our invention is to apply this strategy to yellow dopant design. The requirement for the yellow dopant is a maximum emission of 550 nm. The inventive examples show 550nm emission in OLED devices with CIE of (0.45, 0.54); which is very suitable for yellow dopant applications.

Claims (20)

1. A compound of the formula I, wherein,

wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹to X⁶Each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹to Z⁴Each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

2. The compound of claim 1, wherein R, R', R^A、R^B、R^CAnd R^ZEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, thio, and combinations thereof.

3. The compound of claim 1, wherein the compound has the structure of formula II:

wherein at least two of m1, m2, and m3 are each independently 1.

4. The compound of claim 3, wherein ring A, B and C are each independently a 6-membered aromatic ring.

5. The compound of claim 3, wherein at least one of rings a and B is a 5-membered aromatic ring.

6. A compound according to claim 3, wherein m2 is 1, and L²Is a direct bond or NR.

7. The compound of claim 3, wherein m3 is 1, and L³Is O or CRR'.

8. The compound of claim 3, wherein Y¹And Y²Are all direct bonds.

9. The compound of claim 3, wherein Z comprises a structure selected from the group consisting of:

wherein the dashed line marked with the pound (#) indicates a direct bond to ring a;

wherein the dotted line marked with an asterisk (—) represents a direct bond to M; and is

Wherein is marked with the number (&) Is represented by a dotted line of³A direct bond of (2).

10. The compound of claim 3, wherein the compound comprises a structure selected from the group consisting of:

wherein R is^FAnd R^GEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R^F、R^Gand R^XEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

11. According toThe compound of claim 3, wherein the compound is selected from the group consisting of compound k-Si-j; wherein k is an integer of 1 to 3, i is an integer of 1 to 114, and j is an integer of 1 to 44, and for each Si, the compound has a structure defined in the following list 1, wherein X in the structure is O when k ═ 1, and X in the structure is CMe when k ═ 2₂(ii) a And when k is 3, X in the structure is NPh:

wherein for each j, R¹To R⁵The definition is as follows:

12. the compound of claim 1, wherein the compound has the structure of formula III

Wherein:

rings Z1, Z2, Z3, Z4, and Z5 are each independently a 5-or 6-membered carbocyclic or heterocyclic ring, wherein each of the carbocyclic or heterocyclic rings is continuously fused to each other;

R^Z1、R^Z2、R^Z3、R^Z4and R^Z5Each independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused to form a ring.

13. The compound of claim 12, wherein the compound has formula (la)

Or the compound is selected from the group consisting of:

14. the compound of claim 12, wherein the compound is selected from the group consisting of the compounds in list 2 below:

15. the compound of claim 1, wherein the compound has a structure according to a formula selected from the group consisting of:

wherein:

ring Z1', Z3', Z4', Z5', Z6 'and Z7' are each independently a 5-or 6-membered carbocyclic or heterocyclic ring, wherein rings Z1 'to Z7' are fused continuously to each other;

R^Z1'、R^Z3'、R^Z4'、R^Z5'、R^Z6'and R^Z7'Each independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

16. The compound of claim 15, wherein the compound is selected from the group consisting of:

wherein each R^C'Is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

17. The compound of claim 15, wherein the compound is selected from the group consisting of the structures in list 3 below:

18. the compound of claim 15, wherein the compound is selected from the group consisting of compounds Ti-j, wherein i is an integer from 1 to 72 and j is an integer from 1 to 20, and for each Ti the compound has the structure defined in the following list 4:

wherein for each j, R¹¹To R¹⁵The definition is as follows:

19. an Organic Light Emitting Device (OLED), comprising:

anode

A cathode; and

an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected fromThe group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹to X⁶Each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹to Z⁴Each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

20. A consumer product comprising an organic light emitting device, OLED, the organic light emitting device comprising:

anode

A cathode; and

an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound of formula I

Wherein:

m is Pd or Pt;

A. b and C are each independently a 5-or 6-membered carbocyclic or heterocyclic ring;

the moiety Z alone or together with L⁴Taken together when present as a linking group are fused ring structures comprising four or more fused heterocyclic or carbocyclic rings, each of which is a 5-or 6-membered ring;

L¹、L²、L³and L⁴Each independently selected from the group consisting of: direct bond, BR, BRR', NR, PR, O, S, Se, C-O, S-O, SO₂CRR ', SiRR ', GeRR ', alkyl, cycloalkyl, and combinations thereof;

X¹to X⁶Each independently is C or N;

Y¹、Y²、Y³and Y⁴Each independently selected from the group consisting of: a direct bond, O and S;

Y¹、Y²、Y³and Y⁴At least two of which are direct bonds;

Z¹to Z⁴Each independently is C or N;

m1, m2, m3, m4 are each independently an integer of 0 or 1;

R^A、R^B、R^Cand R^ZEach independently represents zero substitution, mono substitution, or substitution up to the maximum permissible substitution for its associated ring;

R、R'、R^A、R^B、R^Cand R^ZEach independently is hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, oxyboronyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is

Any two substituents may be joined or fused together to form a ring.

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