CN116903662A

CN116903662A - Organic electroluminescent material and device

Info

Publication number: CN116903662A
Application number: CN202310413984.5A
Authority: CN
Inventors: 亚力克西·鲍里索维奇·迪亚特金; 蔡瑞益; 辛卫春; 姬志强
Original assignee: Universal Display Corp
Current assignee: Universal Display Corp
Priority date: 2022-04-18
Filing date: 2023-04-18
Publication date: 2023-10-20

Abstract

The present application relates to organic electroluminescent materials and devices. The present application provides a compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z Is a structure of (a). In Ir (L) _A ) _x (L _B ) _y (L _C ) _z Wherein x is 1, 2 or 3; y is 0,1 or 2; z is 0,1 or 2; x+y+z=3; l (L) _A Having the formula IAnd L is of the structure of _B And L _C Is independently a bidentate ligand. In formula I, moiety a is a monocyclic or polycyclic fused ring system; part B is a fused bicyclic ring system; z is Z ¹ 、Z ² And Z ³ Each is C or N; each R ^A And R is ^B Is hydrogen or a generic substituent as defined herein; at least one R ^A Or R is ^B Comprising an electron withdrawing group; l (L) _A By the dotted lineCoordination to Ir to form a 5 membered chelate ring; and any two substituents may be joined or fused into a ring.

Description

Organic electroluminescent material and device

Cross reference to related applications

The present application is a continuation-in-part application of U.S. patent application Ser. No. 18/058,461 and U.S. patent application Ser. No. 18/177,178, filed on even date with application Ser. No. 18/058,461 and filed on even date 3/2023, the contents of which are incorporated herein by reference. The present application is based on 35U.S. C. ≡119 (e) requirement U.S. provisional application No. 63/481,143 submitted by 23.1.2023, U.S. provisional application No. 63/476,204 submitted by 20.12.2022, U.S. provisional application No. 63/385,994 submitted by 5.12.2022, U.S. provisional application No. 63/385,730 submitted by 1.12.2022, U.S. provisional application No. 63/382,134 submitted by 3.11.2022, U.S. provisional application No. 63/417,746 submitted by 20.10.20.2022, U.S. provisional application No. 63/408,686 submitted by 21.9.21.2022, U.S. provisional application No. 63/408,357 submitted by 9.20.2022 U.S. provisional application No. 63/407,981 filed on 9 and 19 of 2022, U.S. provisional application No. 63/406,019 filed on 9 and 13 of 2022, U.S. provisional application No. 63/392,731 filed on 7 and 27 of 2022, U.S. provisional application No. 63/356,191 filed on 6 and 28 of 2022, U.S. provisional application No. 63/354,721 filed on 23 of 2022, U.S. provisional application No. 63/353,920 filed on 21 of 2022, U.S. provisional application No. 63/351,049 filed on 10 of 2022, U.S. provisional application No. 63/350,150 filed on 8 of 2022 and U.S. provisional application No. 63/332,165 filed on 18 of 2022 and 4, the entire contents of all of the above-referenced applications 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

Optoelectronic devices utilizing organic materials are becoming increasingly popular for a variety of reasons. Many of the materials used to fabricate the devices are relatively inexpensive, so 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 specific 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 can 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 use in 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 (referred to as a "saturated" color). In particular, these standards require saturated red, green and blue pixels. Alternatively, the OLED may be designed to emit white light. In conventional liquid crystal displays, the emission from a white backlight is filtered using an absorbing filter to produce red, green and blue emissions. The same technique can also be used for OLEDs. The white OLED may be a single emissive layer (EML) device or a stacked structure. The colors may be measured using CIE coordinates well known in the art.

Disclosure of Invention

In one aspect, the present disclosure provides a compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z Is a structure of (a). In Ir (L) _A ) _x (L _B ) _y (L _C ) _z In (a):

x is 1, 2 or 3;

y is 0, 1 or 2;

z is 0, 1 or 2;

x+y+z＝3；

L _A has the structure of formula I:and L is _B And L _C Is independently a bidentate ligand;

part a is a monocyclic or polycyclic fused ring system wherein each ring in the monocyclic and polycyclic fused ring systems is independently a 5-or 6-membered carbocyclic or heterocyclic ring;

part B is a fused bicyclic ring system wherein each of the two rings is independently a 5-or 6-membered carbocyclic or heterocyclic ring;

Z ¹ 、Z ² and Z ³ Each independently is C or N;

R ^A and R is ^B Each independently represents mono-substitution to the maximum allowable substitution or no substitution;

each R ^A And R is ^B Independently hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boron, aralkyl, alkoxy, aryloxy, amino, silyl, germane, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, seleno, and combinations thereof;

at least one R ^A Or R is ^B The substituents comprise electron withdrawing groups;

L _A Coordination to Ir via the indicated dashed line to form a 5 membered chelate ring;

L _A can be conjugated with other ligands to form tridentate, tetradentate, pentadentate or hexadentate ligands; and is also provided with

Any two substituents may be joined or fused to form a ring, provided that R ^A And R is ^B No ring is formed.

In another aspect, the present disclosure provides a formulation comprising a compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (a).

In yet another aspect, the present disclosure provides an OLED having an organic layer comprising a light emitting diode having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (a).

In yet another aspect, the present disclosure provides a consumer product comprising an OLED having an organic layer comprising a light emitting diode having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of structure.

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. Terminology

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

as used herein, the term "organic" includes polymeric materials and small molecule organic materials that can be used to fabricate organic optoelectronic devices. "Small molecule" refers to any organic material that is not a polymer, and may be substantial in nature. In some cases, the small molecule may include a repeating unit. For example, the use of long chain alkyl groups as substituents does not remove a molecule from the "small molecule" class. Small molecules may also be incorporated into the polymer, for example as pendant groups on the polymer backbone or as part of the backbone. Small molecules can also act as the core of a dendrimer, which consists of a series of chemical shells built on the core. The core moiety of the dendrimer may be a fluorescent or phosphorescent small molecule emitter. Dendrimers may be "small molecules" and all dendrimers currently used in the OLED field 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. Unless a first layer is "in contact with" a second layer, other layers may be present between the first and second layers. 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 "photosensitive" when it is believed that the ligand contributes directly to the photosensitive properties of the emissive material. When the ligand is considered not to contribute to the photosensitive properties of the emissive material, the ligand may be referred to as "ancillary", but the ancillary ligand may alter the properties of the photosensitive ligand.

As used herein, and as will be generally understood by those of skill in the art, if the first energy level is closer to the vacuum energy level, then the first "highest occupied molecular orbital" (Highest Occupied Molecular Orbital, HOMO) or "lowest unoccupied molecular orbital" (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 a negative energy relative to the vacuum level, a higher HOMO level corresponds to an IP with a smaller absolute value (less negative). Similarly, a higher LUMO energy level corresponds to an Electron Affinity (EA) with a smaller absolute value (less negative EA). On a conventional energy level diagram with vacuum energy level on 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 of skill 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 work function is typically measured as a negative number relative to the vacuum level, this means that the "higher" work function is more negative (more negative). On a conventional energy level diagram with the vacuum energy level on top, a "higher" work function is illustrated as being farther from the vacuum energy level in a downward direction. Thus, the definition of HOMO and LUMO energy levels follows a different rule than work function.

The terms "halo", "halogen" and "halo" are used interchangeably and refer to fluoro, chloro, bromo and iodo.

The term "acyl" refers to a substituted carbonyl (C (O) -R _s )。

The term "ester" refers to a substituted oxycarbonyl (-O-C (O) -R) _s or-C (O) -O-R _s ) A group.

The term "ether" means-OR _s A group.

The terms "thio" or "thioether" may be used with each otherUsed interchangeably and referred to as SR _s A group.

The term "seleno" refers to-SeR _s A group.

The term "sulfinyl" refers to-S (O) -R _s A group.

The term "sulfonyl" refers to-SO ₂ -R _s A group.

The term "phosphino" refers to-P (R _s ) ₃ A group wherein each R _s May be the same or different.

The term "silane group" means-Si (R _s ) ₃ A group wherein each R _s May be the same or different.

The term "germyl" refers to-Ge (R _s ) ₃ A group wherein each R _s May be the same or different.

The term "boron group" means-B (R _s ) ₂ A group or Lewis addition product-B (R) _s ) ₃ A group, wherein R is _s May be the same or different.

In each of the above, R _s May 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 _s Selected 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, alkyl groups 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, cycloalkyl groups 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 both straight and branched alkenyl groups. Alkenyl is essentially an alkyl group comprising at least one carbon-carbon double bond in the alkyl chain. Cycloalkenyl is essentially cycloalkyl including 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, alkenyl, cycloalkenyl, or heteroalkenyl groups may be optionally substituted.

The term "alkynyl" refers to and includes both straight and branched chain alkynyl groups. Alkynyl is essentially an alkyl group that includes 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 term "aralkyl" or "arylalkyl" is used interchangeably and refers to an alkyl group substituted with an aryl group. In addition, aralkyl groups may be optionally substituted.

The term "heterocyclyl" refers to and includes 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. 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/sulfides 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 hydrocarbon groups and polycyclic aromatic ring systems. The polycyclic ring may have two or more rings in common in which two carbons are two adjoining rings (the rings being "fused"), wherein at least one of the rings is an aromatic hydrocarbon group, e.g., the other rings may be cycloalkyl, cycloalkenyl, aryl, heterocyclic, and/or heteroaryl. 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. Particularly preferred are aryl groups having six carbons, ten carbons or twelve carbons. Suitable aryl groups include phenyl, biphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, Perylene and azulene, preferably phenyl, biphenyl, triphenylene, fluorene and naphthalene. In addition, aryl groups 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. The monocyclic heteroaromatic system is preferably a monocyclic ring having 5 or 6 ring atoms, and the ring may have one to six heteroatoms. The heteropolycyclic ring system may have two or more rings in which two atoms are common to two adjoining rings (the rings being "fused"), wherein at least one of the rings is heteroaryl, e.g., the other rings may be cycloalkyl, cycloalkenyl, aryl, heterocyclic, and/or heteroaryl. The heteropolycyclic aromatic ring system may have one to six heteroatoms in each 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, pyrrolodipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, diazole, 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 (xanthene), acridine, phenazine, phenothiazine, phenoxazine, benzofurandipyridine, benzothiophene pyridine, thienodipyridine, benzoselenophene dipyridine, dibenzofuran, dibenzoselenium, carbazole, indolocarbazole, benzimidazole, triazine, 1, 2-borazine, 1-boron-nitrogen, 1-nitrogen, 4-boron-nitrogen, boron-nitrogen-like compounds, and the like. In addition, heteroaryl groups 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, and their respective corresponding aza analogues, are of particular interest.

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 common substituents.

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

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

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

The terms "substituted" and "substituted" refer to substituents other than H bonded to the relevant position, such as carbon or nitrogen. For example, when R ¹ When single substitution is represented, then one R ¹ It must not be H (i.e., substitution). Similarly, when R ¹ When two are substituted, two R ¹ It must not be H. Similarly, when R ¹ R represents zero or no substitution ¹ For example, it may be hydrogen of available valence of the ring atoms, such as carbon atoms of benzene and nitrogen atoms in pyrrole, or for ring atoms having a fully saturated valence, it may simply represent none, such as nitrogen atoms in pyridine. The maximum number of substitutions possible in the ring structure will depend on the total number of available valences in the ring atom.

As used herein, "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 contemplate from the applicable list. For example, alkyl and deuterium can combine to form a partially or fully deuterated alkyl group; halogen and alkyl may combine to form a haloalkyl substituent; and halogen, alkyl and aryl may combine to form a haloaralkyl. In one example, the term substitution includes a combination 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 combinations containing up to fifty atoms other than hydrogen or deuterium, or combinations comprising up to forty atoms other than hydrogen or deuterium, or combinations comprising 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 fragments described herein, i.e., aza-dibenzofuran, aza-dibenzothiophene, etc., means that one or more of the C-H groups in the corresponding aromatic ring may be replaced with a nitrogen atom, for example and without limitation, aza-triphenylene encompasses dibenzo [ f, H ] quinoxaline and dibenzo [ f, H ] quinoline. Other nitrogen analogs of the aza-derivatives described above can be readily envisioned by those of ordinary skill in the art, and all such analogs are intended to be encompassed by the terms 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. Further reference is made to Yan Ming (Ming Yan) et al, tetrahedron 2015,71,1425-30 and Azrote (Atzrodt) et al, germany application chemistry (Angew. Chem. Int. Ed.) (reviewed) 2007,46,7744-65, which is incorporated by reference in its entirety, describes the deuteration of methylene hydrogen in benzylamine and the efficient pathway of replacement of aromatic ring hydrogen with deuterium, respectively.

It will be appreciated that when a fragment of a molecule is described as a substituent or otherwise attached to another moiety, its name may 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 ways of naming substituents or linking fragments are considered equivalent.

In some cases, a pair of adjacent substituents may optionally be joined or fused into a ring. Preferred rings are five-, six-, or seven-membered carbocycles or heterocycles, including both cases where a portion of the ring formed by the pair of substituents is saturated and 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 next to each other on the same ring, 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

x is 1, 2 or 3;

y is 0, 1 or 2;

z is 0, 1 or 2;

x+y+z＝3；

Z ¹ 、Z ² and Z ³ Each independently is C or N;

each R ^A And R is ^B Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein;

L _A can be conjugated with other ligands to form a tridentate, tetradentate, pentadentate or hexadentate ligandA body; and is also provided with

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

In some embodiments, R ^A And R is ^B No ring is formed.

In some embodiments, the compound has the formula Ir (L _A ) _x (L _B ) _y Wherein x is 1, 2 or 3; y is 0, 1 or 2; and x+y=3. In some embodiments, the compound has the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z Wherein z is 0.

In some embodiments, L _C May be L as defined throughout the present disclosure _A And L _B Any of the embodiments of (2) provided that L _C With L in the same molecule _A Or L _B Different materials are needed. In some embodiments, L _C May be substituted or unsubstituted phenylpyridine, or substituted or unsubstituted acetylacetonate. In some embodiments, L _C Comprising a carbene moiety. In some embodiments, the carbene moiety is a 5-or 6-membered, N-containing aromatic ring.

In some embodiments, when moiety B is naphthyl, L _B Is a substituted acetylacetonate ligand. In some embodiments, when moiety B is naphthyl and L _B In the case of ligands based on acetylacetonate, then L _B Is a substituted acetylacetonate ligand.

In some embodiments, each R ^A And R is ^B Independently hydrogen or a substituent selected from the group consisting of preferred general substituents. In some embodiments, each R ^A And R is ^B Independently hydrogen or a substituent selected from the group consisting of more preferably general substituents. In some embodiments, each R ^A And R is ^B Independently hydrogen or a substituent selected from the group consisting of most preferably general substituents.

In some embodiments, x is 3 and y is 0. In some embodiments, x is 2 and y is 1. In some embodiments, x is 1 and y is 2.

In some implementationsIn embodiments, Z ² Is C and Z ¹ Is N. In some embodiments, Z ¹ Is N and Z ² Is C. In some embodiments, Z ² Is N and Z ³ Is C. In some embodiments, Z ³ Is C and Z ² Is N. In some such embodiments, Z ¹ Is C.

In some embodiments, moiety a is an aromatic ring. In some embodiments, part a is a single ring. In some such embodiments, part a is selected from the group consisting of: benzene, pyridine, pyrimidine, pyridazine, pyrazine, triazine, imidazole, pyrazole, pyrrole, oxazole, furan, thiophene, and thiazole.

In some embodiments, moiety a is a polycyclic fused ring system. In some such embodiments, part a is selected from the group consisting of: naphthalene, quinoline, isoquinoline, quinazoline, benzofuran, aza-benzofuran, benzoxazole, aza-benzoxazole, benzothiophene, aza-benzothiophene, benzothiazole, aza-benzothiazole, benzoselenophene, aza-benzoselenophene, indene, aza-indene, indole, aza-indole, benzimidazole, aza-benzimidazole, carbazole, aza-carbazole, dibenzofuran, aza-dibenzofuran, dibenzothiophene, aza-dibenzothiophene, quinoxaline, phthalazine, phenanthrene, aza-phenanthrene, anthracene, aza-anthracene, phenanthridine, fluorene, and aza-fluorene. In some such embodiments, the aza variant comprises one N on the benzo ring. In some such embodiments, the aza variant comprises one N located on the benzo ring and the N is bonded to Ir.

In some embodiments, part a is selected from the group consisting of: pyridine, imidazole, aza-phenanthrene and aza-anthracene. In some embodiments, moiety a is pyridine.

In some embodiments, moiety a is aza-phenanthrene or aza-anthracene. In some such embodiments, only one N is present and is in the end ring and bonded to Ir.

In some embodiments, moiety a is a polycyclic fused ring structure comprising at least three fused rings. In some embodiments, the polycyclic fused ring structure has two 6 membered rings and one 5 membered ring. In some such embodiments, the 5-membered ring is fused to a ring coordinated to Ir and the second 6-membered ring is fused to the 5-membered ring. In some embodiments, part a is selected from the group consisting of: dibenzofuran, dibenzothiophene, dibenzoselenophene, and aza variants thereof. In some such embodiments, moiety a may be further substituted at the ortho or meta position of the O, S or Se atom with a substituent selected from the group consisting of: deuterium, fluorine, nitrile, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some such embodiments, the aza variant contains exactly one N atom at the 6 position (O, S or ortho to Se) and a substituent at the 7 position (O, S or meta to Se).

In some embodiments, moiety a is a polycyclic fused ring structure comprising at least four fused rings. In some embodiments, the polycyclic fused ring structure comprises three 6 membered rings and one 5 membered ring. In some such embodiments, the 5-membered ring is fused to a ring coordinated to Ir, the second 6-membered ring is fused to the 5-membered ring, and the third 6-membered ring is fused to the second 6-membered ring. In some such embodiments, the third 6-membered ring is further substituted with a substituent selected from the group consisting of: deuterium, fluorine, nitrile, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

In some embodiments, moiety a is a polycyclic fused ring structure comprising at least five fused rings. In some embodiments, the polycyclic fused ring structure comprises four 6-membered rings and one 5-membered ring or three 6-membered rings and two 5-membered rings. In some embodiments comprising two 5-membered rings, the 5-membered rings are fused together. In some embodiments comprising two 5-membered rings, the 5-membered rings are separated by at least one 6-membered ring. In some embodiments having one 5-membered ring, the 5-membered ring is fused to a ring coordinated to Ir, the second 6-membered ring is fused to the 5-membered ring, the third 6-membered ring is fused to the second 6-membered ring, and the fourth 6-membered ring is fused to the third 6-membered ring.

In some embodiments, moiety a is an aza form of a polycyclic fused ring as described above. In some such embodiments, moiety a contains exactly one aza N atom. In some such embodiments, moiety a contains exactly two aza N atoms, which may be located in one ring or in two different rings. In some such embodiments, the ring having the aza N atom is separated from the Ir atom by at least two other rings. In some such embodiments, the ring having the aza N atom is separated from the Ir atom by at least three other rings. In some such embodiments, each ortho position to the aza N atom is substituted.

In some embodiments, moiety B is bonded to ring a through a C atom.

In some embodiments, moiety B is bonded to Ir through a C atom.

In some embodiments, part B is selected from the group consisting of: naphthalene, quinoline, isoquinoline, quinazoline, benzofuran, aza-benzofuran, benzoxazole, aza-benzoxazole, benzothiophene, aza-benzothiophene, benzothiazole, aza-benzothiazole, benzoselenophene, aza-benzoselenophene, indene, aza-indene, indole, aza-indole, benzimidazole, aza-benzimidazole.

In some embodiments, moiety B is selected from the group consisting of naphthalene, benzofuran, and benzoxazole. In some embodiments, moiety B is naphthalene.

In some embodiments, moiety B comprises at least one 5-membered ring. In some such embodiments, at least one 5-membered ring coordinates to Ir.

In some embodiments, moiety B comprises at least one 6 membered ring. In some such embodiments, at least 6 membered rings coordinate to Ir.

In some embodiments, there are no two R ^A Joined to form a loop.

In some embodiments, there are no two R ^B Joined to form a loop.

In some embodiments, the electron withdrawing group generally comprises one or more highly electronegative elements including, but not limited to, fluorine, oxygen, sulfur, nitrogen, chlorine, and bromine.

In some embodiments, R ^A Or R is ^B Comprises or is an electron withdrawing group selected from the group consisting of the following EWG list: F. CF (compact flash) ₃ 、CN、COCH ₃ 、CHO、COCF ₃ 、COOMe、COOCF ₃ 、NO ₂ 、SF ₃ 、SiF ₃ 、PF ₄ 、SF ₅ 、OCF ₃ 、SCF ₃ 、SeCF ₃ 、SOCF ₃ 、SeOCF ₃ 、SO ₂ F、SO ₂ CF ₃ 、SeO ₂ CF ₃ 、OSeO ₂ CF ₃ 、OCN、SCN、SeCN、NC、 ⁺ N(R) ₃ 、(R) ₂ CCN、(R) ₂ CCF ₃ 、CNC(CF ₃ ) ₂ BRR', substituted or unsubstituted dibenzoborole, 1-substituted carbazole, 1, 9-substituted carbazole, substituted or unsubstituted pyridine, substituted or unsubstituted pyrimidine, substituted or unsubstituted pyrazine, substituted or unsubstituted pyridazine, substituted or unsubstituted triazine, substituted or unsubstituted oxazole, substituted or unsubstituted benzoxazole, substituted or unsubstituted thiazole, substituted or unsubstituted benzothiazole, substituted or unsubstituted imidazole, substituted or unsubstituted benzimidazole, ketone, carboxylic acid, ester, nitrile, isonitrile, sulfinyl, sulfonyl, partially and fully fluorinated alkyl, partially and fully fluorinated aryl, partially and fully fluorinated heteroaryl, cyano-containing alkyl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate,

Wherein each R is independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein; wherein Y' is selected from the group consisting of: BR (BR) _e 、NR _e 、PR _e 、O、S、Se、C＝O、S＝O、SO ₂ 、CR _e R _f 、SiR _e R _f And GeR _e R _f' The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with

Wherein each R is _e And R is _f Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein.

In some embodiments, the electron withdrawing group is a pi-electron deficient electron withdrawing group. In some embodiments, the pi-electron deficient electron withdrawing group is selected from the group consisting of: CN, COCH ₃ 、CHO、COCF ₃ 、COOMe、COOCF ₃ 、NO ₂ 、SF ₃ 、SiF ₃ 、PF ₄ 、SF ₅ 、OCF ₃ 、SCF ₃ 、SeCF ₃ 、SOCF ₃ 、SeOCF ₃ 、SO ₂ F、SO ₂ CF ₃ 、SeO ₂ CF ₃ 、OSeO ₂ CF ₃ 、OCN、SCN、SeCN、NC、 ⁺ N(R) ₃ BRR', substituted or unsubstituted dibenzoborolan, 1-substituted carbazole, 1, 9-substituted carbazole, substituted or unsubstituted pyridine, substituted or unsubstituted pyrimidine, substituted or unsubstituted pyrazine, substituted or unsubstituted pyridazine, substituted or unsubstituted triazine, substituted or unsubstituted oxazole, substituted or unsubstituted benzoxazole, substituted or unsubstituted thiazole, substituted or unsubstituted benzothiazole, substituted or unsubstituted imidazole, substituted or unsubstituted benzimidazole, ketone, carboxylic acid, ester, nitrile, isonitrile, sulfinyl, sulfonyl, partially and fully fluorinated aryl, partially and fully fluorinated heteroaryl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate, /> Each of which R, R _e And R is _f Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein;wherein Y' is selected from the group consisting of: BR (BR) _e 、NR _e 、PR _e 、O、S、Se、C＝O、S＝O、SO ₂ 、CR _e R _f 、SiR _e R _f And GeR _e R _f' . More detailed information about pi-electron deficient electron withdrawing groups can be found in U.S. provisional application Ser. No. 63/417,746 and U.S. provisional application Ser. No. 63/481,143, both filed on days 2022, 2023, 10, 20 and 23, 2023, which are incorporated herein by reference.

In some embodiments, the electron withdrawing group is selected from the group consisting of:

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in some embodiments, R ^A At least one of (A) and R ^B Independently selected from the group consisting of structures in the EWG list.

In some embodiments, R ^A Does not contain electron withdrawing groups.

In some embodiments, at least one R ^A Comprising an electron withdrawing group. In some embodiments, at least one R ^A An electron withdrawing group selected from the group consisting of structures in the EWG list.

In some embodiments, R ^B Does not contain electron withdrawing groups.

In some embodiments, at least one R ^B Comprising an electron withdrawing group. In some embodiments, at least one R ^B An electron withdrawing group selected from the group consisting of structures in the EWG list.

In some embodiments, R ^A Or R is ^B Comprises electron withdrawing groups consisting of CN, F and partially or fully deuterated alkyl groups. In some embodiments, R ^A Or R is ^B At least one of them is CF ₃ 。

In some embodiments, R ^A Comprises electron withdrawing groups consisting of CN, F and partially or fully deuterated alkyl groups. In some embodiments, R ^A At least one of them is CF ₃ 。

In some embodiments, R ^B Comprises electron withdrawing groups consisting of CN, F and partially or fully deuterated alkyl groups. In some embodiments, R ^B At least one of them is CF ₃ 。

In some embodiments, R ^A Or R is ^B Is an electron withdrawing group having a Hammett constant (Hammett constant) greater than 0. In some embodiments, R ^A Or R is ^B At least one of (2) is a polymer having at least 0.1, or at least 0.2, or at least 0.3, or at least 0.4, or at least 0.5, or at least 0.6An electron withdrawing group having a Hammett constant of at least 0.7, or at least 0.8, or at least 0.9, or at least 1.0, or at least 1.1.

In some embodiments, at least one R ^A Is hydrogen or an electron withdrawing group.

In some embodiments, at least one R ^A A cyclic moiety a' selected from the group consisting of cycloalkyl, aryl, or heteroaryl, any of which may be further substituted.

In some embodiments including moiety a ', at least one atom of moiety a' adjacent to the bond of moiety a is not substituted with hydrogen or deuterium. In some embodiments including moiety a ', each atom of moiety a' adjacent to the bond of moiety a is not substituted with hydrogen or deuterium.

In some embodiments including moiety a ', at least one atom of moiety a' adjacent to the bond of moiety a is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl. In some embodiments including moiety a ', each atom of moiety a' adjacent to the moiety a bond is independently substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl.

In some embodiments including moiety a ', moiety a' is a 6 membered ring and para to moiety a is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl.

In some embodiments including moiety a ', moiety a' is benzene and para to moiety a is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl. In some embodiments including moiety a ', moiety a' is benzene and para to moiety a is substituted with a phenyl moiety. In some embodiments including moiety a ', moiety a' is benzene and para to moiety a is substituted with a biphenyl moiety.

In some embodiments, at least one R ^B Not hydrogen or an electron withdrawing group.

In some embodiments, at least one R ^B A cyclic moiety B' selected from the group consisting of cycloalkyl, aryl or heteroaryl, any of which may be substitutedOne step is substituted.

In some embodiments including moiety B ', at least one atom of moiety B' adjacent to the bond of moiety B is not substituted with hydrogen or deuterium. In some embodiments including moiety B ', each atom of moiety B' adjacent to the bond of moiety B is not substituted with hydrogen or deuterium.

In some embodiments including moiety B ', at least one atom of moiety B' adjacent to the bond of moiety B is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl. In some embodiments including moiety B ', each atom of moiety B' adjacent to the moiety B bond is independently substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl.

In some embodiments including moiety B ', moiety B' is a 6 membered ring and para to moiety B is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl.

In some embodiments including moiety B ', moiety B' is benzene and para to moiety B is substituted with a moiety selected from the group consisting of: alkyl, cycloalkyl, aryl, and heteroaryl. In some embodiments including moiety B ', moiety B' is benzene and para to moiety B is substituted with a phenyl moiety. In some embodiments including moiety B ', moiety B' is benzene and para to moiety B is substituted with a biphenyl moiety.

In some embodiments, L _B Is substituted acetylacetonate

In some embodiments, ligand L _A Selected from the group consisting of the structures in table 1 below:/>/>

wherein:

X ₁ to X ₆ Is independently C or N;

Y ^B1 and Y ^B2 Selected from the group consisting of: BR, BRR ', NR, PR, P (O) R, O, S, se, C = O, C = S, C =se, c=nr, c=crr', s= O, SO ₂ CR, CRR ', siRR ', and GeRR ';

R ^BB represents a single substitution to the maximum allowable substitution or no substitution;

each R, R' and R ^BB Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein;

R、R'、R ^A and R is ^BB Any two of which may be joined or fused to form a ring.

In some embodiments, ligand L _A Selected from the group consisting of the structures of the following list 2: />

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wherein:

X ₁ to X ₁₂ Is independently C or N;

Y ^A1 and Y ^B1 Independently selected from the group consisting of: BR, BRR ', NR, PR, P (O) R, O, S, se, C = O, C = S, C =se, c=nr, c=crr', s= O, SO ₂ CR, CRR ', siRR ', and GeRR ';

R ^AA and R is ^BB Each of which is an independent earth's surfaceShowing monosubstituted to maximum allowable substitution or no substitution;

each R, R', R ^AA And R is ^BB Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein; and is also provided with

R、R'、R ^AA And R is ^BB Any two of which may be joined or fused to form a ring.

In some embodiments of all of the above structures, X ₁ To X ₁₂ Each of which is independently C. In some embodiments, X ₁ To X ₁₂ At least one of which is N.

In some embodiments directed to the following structure: X ₅ to X ₁₂ Each of which is independently C. In some embodiments, X ₅ To X ₁₂ At least one of which is N. In some embodiments, X ₆ Is N. In some embodiments, X ₅ Is N. In some embodiments, X ₁ To X ₄ Each of which is independently C. In some embodiments, X ₁ To X ₄ One of which is N.

In some embodiments, ligand L _A Selected from the group consisting of L _Ai A group of where i is an integer from 1 to 108 and each L _Ai Defined in the following table 3:/>

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in some embodiments, the compound has a molecular structure selected from the group consisting of Ir (L _A ) ₃ 、Ir(L _A )(L _B ) ₂ And Ir (L) _A ) ₂ (L _B ) The formula of the group.

In some embodiments, L _B Is a substituted or unsubstituted phenylpyridine.

In some embodiments, L _B Is a substituted or unsubstituted acetylacetonate.

In some embodiments, L _B Is L as described herein _Cj-I Or L _Cj-II 。

In some embodiments, L _B Each independently selected from the group consisting of the structures in the following table 4:

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wherein:

t is selected from the group consisting of B, al, ga and In;

K ¹ ' selected from the group consisting of: single bond, O, S, NR _e 、PR _e 、BR _e 、CR _e R _f And SiR _e R _f ；

Y ¹ To Y ¹³ Independently selected from the group consisting of C and N;

y' is selected from the group consisting of: BR (BR) _e 、BR _e R _f 、NR _e 、PR _e 、P(O)R _e 、O、S、Se、C＝O、

C＝S、C＝Se、C＝NR _e 、C＝CR _e R _f 、S＝O、SO ₂ 、CR _e R _f 、SiR _e R _f And GeR _e R _f ；

R _e And R is R _f Can be fused or joined to form a ring;

each R _a 、R _b 、R _c And R is _d Independently represents a single substitution to a maximum allowable number of substitutions or no substitution;

R _a1 、R _b1 、R _c1 、R _d1 、R _a 、R _b 、R _c 、R _d 、R _e and R is _f Independently hydrogen or a substituent selected from the group consisting of the general substituents defined herein; and is also provided with

R _a1 、R _b1 、R _c1 、R _d1 、R _a 、R _b 、R _c And R is _d Any two substitutions of (2)The groups may be fused or joined to form a ring or to form a multidentate ligand.

In some embodiments, L _B Each independently selected from the group consisting of the structures in the following list 5:

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wherein:

R _a '、R _b '、R _c '、R _d ' and R _e ' each independently represents zero substitution, a single substitution, or up to a maximum allowable number of substitutions to its associated ring;

R _a '、R _b '、R _c '、R _d ' and R _e ' each independently is hydrogen or a substituent selected from the group consisting of the general substituents defined herein; and is also provided with

R _a '、R _b '、R _c '、R _d ' and R _e The two substituents of' may be fused or joined to form a ring or to form a multidentate ligand.

In some embodiments, the compound may have the formula Ir (L _Ai ) ₃ Ir (L) _Ai )(L _Bk ) ₂ Ir (L) _Ai ) ₂ (L _Cj-I ) Or Ir (L) _Ai ) ₂ (L _Cj-II ) Wherein i is an integer from 1 to 108; k is an integer from 1 to 474; and j is an integer from 1 to 1416,

wherein:

when the compound has the formula Ir (L _Ai ) ₃ When the compound is selected from Ir (L) _A1 ) ₃ To Ir (L) _A108 ) ₃ A group of groups;

when the compound has the formula Ir (L _Ai )(L _Bk ) ₂ When the compound is selected from Ir (L) _A1 )(L _B1 ) ₂ To Ir (L) _A108 )(L _B474 ) ₂ A group of groups;

when the compound has the formula Ir (L _Ai ) ₂ (L _Bk ) When the compound is selected from Ir (L) _A1 ) ₂ (L _B1 ) To Ir (L) _A108 ) ₂ (L _B474 ) A group of groups;

when the compound has the formula Ir (L _A ) ₂ (L _Cj-I ) When the compound is selected from Ir (L) _A1 ) ₂ (L _C1-I ) To Ir (L) _A108 ) ₂ (L _C1416-I ) A group of groups; and is also provided with

When the compound has the formula Ir (L _A ) ₂ (L _Cj-II ) When the compound is selected from Ir (L) _A1 ) ₂ (L _C1-II ) To Ir (L) _A108 ) ₂ (L _C1416-II ) A group of groups;

wherein L is _B1 To L _B474 Has a structure defined in the following table 6:/>

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wherein each L _Cj-I With the basisIs of a structure of (2); and is also provided with

Each L _Cj-II With the basisWherein for L _Cj-I And L _Cj-II Each L of (3) _Cj ，R ²⁰¹ And R is ²⁰² Each independently defined in the following table 7:

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wherein R is ^D1 To R ^D246 Having a structure defined in the following table 8: />

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in some embodiments, the compound is selected from the group consisting of only L thereof _Bk The ligand corresponds to a group of compounds of one of the following: l (L) _B1 、L _B2 、L _B18 、L _B28 、L _B38 、L _B108 、L _B118 、L _B122 、L _B124 、L _B126 、L _B128 、L _B130 、L _B132 、L _B134 、L _B136 、L _B138 、L _B140 、L _B142 、L _B144 、L _B156 、L _B158 、L _B160 、L _B162 、L _B164 、L _B168 、L _B172 、L _B175 、L _B204 、L _B206 、L _B214 、L _B216 、L _B218 、L _B220 、L _B222 、L _B231 、L _B233 、L _B235 、L _B237 、L _B240 、L _B242 、L _B244 、L _B246 、L _B248 、L _B250 、L _B252 、L _B254 、L _B256 、L _B258 、L _B260 、L _B262 、L _B264 、L _B265 、L _B266 、L _B267 、L _B268 、L _B269 And L _B270 。

In some embodiments, the compound is selected from the group consisting of only L thereof _Bk The ligand corresponds to a group of compounds of one of the following: l (L) _B1 、L _B2 、L _B18 、L _B28 、L _B38 、L _B108 、L _B118 、L _B122 、L _B126 、L _B128 、L _B132 、L _B136 、L _B138 、L _B142 、L _B156 、L _B162 、L _B204 、L _B206 、L _B214 、L _B216 、L _B218 、L _B220 、L _B231 、L _B233 、L _B237 、L _B264 、L _B265 、L _B266 、L _B267 、L _B268 、L _B269 And L _B270 。

In some embodiments, the compound is selected from the group consisting of having L _Cj-I Or L _Cj-II Groups of only those compounds of the ligand, corresponding R of the ligand ²⁰¹ And R is ²⁰² Is defined as one of the following structures: r is R ^D1 、R ^D3 、R ^D4 、R ^D5 、R ^D9 、R ^D10 、R ^D17 、R ^D18 、R ^D20 、R ^D22 、R ^D37 、R ^D40 、R ^D41 、R ^D42 、R ^D43 、R ^D48 、R ^D49 、R ^D50 、R ^D54 、R ^D55 、R ^D58 、R ^D59 、R ^D78 、R ^D79 、R ^D81 、R ^D87 、R ^D88 、R ^D89 、R ^D93 、R ^D116 、R ^D117 、R ^D118 、R ^D119 、R ^D120 、R ^D133 、R ^D134 、R ^D135 、R ^D136 、R ^D143 、R ^D144 、R ^D145 、R ^D146 、R ^D147 、R ^D149 、R ^D151 、R ^D154 、R ^D155 、R ^D161 、R ^D175 、R ^D190 、R ^D193 、R ^D200 、R ^D201 、R ^D206 、R ^D210 、R ^D214 、R ^D215 、R ^D216 、R ^D218 、R ^D219 、R ^D220 、R ^D227 、R ^D237 、R ^D241 、R ^D242 、R ^D245 And R is ^D246 。

In some casesIn an embodiment, the compound is selected from the group consisting of compounds having L _Cj-I Or L _Cj-II Groups of only those compounds of the ligand, corresponding R of the ligand ²⁰¹ And R is ²⁰² Is defined as one of the following structures: r is R ^D1 、R ^D3 、R ^D4 、R ^D5 、R ^D9 、R ^D10 、R ^D17 、R ^D22 、R ^D43 、R ^D50 、R ^D78 、R ^D116 、R ^D118 、R ^D133 、R ^D134 、R ^D135 、R ^D136 、R ^D143 、R ^D144 、R ^D145 、R ^D146 、R ^D149 、R ^D151 、R ^D154 、R ^D155 、R ^D190 、R ^D193 、R ^D200 、R ^D201 、R ^D206 、R ^D210 、R ^D214 、R ^D215 、R ^D216 、R ^D218 、R ^D219 、R ^D220 、R ^D227 、R ^D237 、R ^D241 、R ^D242 、R ^D245 And R is ^D246 。

In some embodiments, the compound is selected from the group consisting of only compounds having the following L _Cj-I Those compounds of one of the ligand structures:/>

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in some embodiments, the compound has a molecular structure selected from the group consisting of Ir (L _A ) ₂ (L _B )、Ir(L _A )(L _B ) ₂ 、Ir(L _A ) ₂ (L _C* )、Ir(L _A )(L _C* ) ₂ And Ir (L) _A )(L _B )(L _C ) Of the group ofFormula (I). In such embodiments, L _A Selected from the group consisting of structures of list 1, list 2, and list 3, L _B Selected from the group consisting of structures of list 4, list 5, and list 6, and L _C* Selected from the group consisting of L _Cj-I And L _Cj-II Wherein j is an integer from 1 to 1416, wherein L _Cj-I With the basisIs of a structure of (2); and is also provided with

Each L _Cj-II With the basisWherein for L _Cj-I And L _Cj-II Each L of (3) _Cj ，R ²⁰¹ And

R ²⁰² each independently defined in the following Table 7, and L _C Selected from list 1, list 2, list 3, list 4, list 5, list 6, L _Cj-I And L _Cj-II Provided that L _C And L is equal to _A Or L _B Different materials are needed.

In some embodiments, L _A Selected from the group consisting of the structures of list 1, and L _B Selected from the group consisting of the structures of list 6. In some embodiments, L _A Selected from the group consisting of the structures of list 2, and L _B Selected from the group consisting of the structures of list 6. In some embodiments, L _A Selected from the group consisting of the structures of list 3 as defined herein, and L _B Selected from the group consisting of the structures of list 6. In some embodiments, L _A Selected from the group consisting of structures of list 3, and L _C* Selected from the group consisting of L _Cj-I And L _Cj-II Wherein j is an integer from 1 to 1416.

In some embodiments, the compound has a structure selected from the group consisting of Ir (L _Ai ) ₃ 、Ir(L _Ai )(L _B ) ₂ 、Ir(L _Ai ) ₂ (L _B )、Ir(L _Ai ) ₂ (L _C* )、Ir(L _Ai )(L _C* ) ₂ 、Ir(L _Ai )(L _B )(L _C ) Of the group consisting of, wherein L _C Selected from list 1, list 2, list 3, list 4, list 5, list 6, L _Cj-I And L _Cj-II Provided that L _C And L is equal to _Ai Or L _B Different and the remaining variables are the same as defined previously.

In some embodiments, the compound has a structure selected from the group consisting of Ir (L _A )(L _Bk ) ₂ 、Ir(L _A ) ₂ (L _Bk ) And Ir (L) _A )(L _Bk )(L _C ) Of the group consisting of, wherein L _C Selected from list 1, list 2, list 3, list 4, list 5, list 6, L _Cj-I And L _Cj-II Provided that L _C And L is equal to _A Or L _Bk Different and the remaining variables are the same as defined previously.

In some embodiments, the compound has a structure selected from the group consisting of Ir (L _Ai )(L _Bk ) ₂ 、Ir(L _Ai ) ₂ (L _Bk ) And Ir (L) _Ai )(L _Bk )(L _C ) Of the group consisting of, wherein L _C Selected from list 1, list 2, list 3, list 4, list 5, list 6, L _Cj-I And L _Cj-II Provided that L _C And L is equal to _Ai Or L _Bk Different and the remaining variables are the same as defined previously.

In some embodiments, the compound is selected from the group consisting of the structures in the following list 9:

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in some embodiments, a compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z The compound of the structure of (c) may be at least 30% deuterated, at least 40% deuterated, at least 50% deuterated, at least 60% deuterated, at least 70% deuterated, at least 80% deuterated, at least 90% deuterated, at least 95% deuterated, at least 99% deuterated, or 100% deuterated. As used herein, deuterated percentages have their ordinary meaning and include percentages of possible hydrogen atoms replaced by deuterium atoms (e.g., hydrogen or deuterium sites).

In a compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z In some embodiments of the compounding compounds of (2), ligand L _A Having a first substituent R ^I Wherein the first substituent R ^I With a ligand L _A The first atom a-I furthest from the metal M among all the atoms in (a). In addition, ligand L _B Having a second substituent R if present ^II Wherein the second substituent R ^II a-II at ligand L _B Is furthest from the metal M among all atoms of (a). In addition, ligand L _C Having a third substituent R if present ^III Wherein the third substituent R ^III The first atom a-III in the ligand L _C Is furthest from the metal M among all atoms of (a).

In such compound, vector V _D1 、V _D2 And V _D3 May be defined as follows. V (V) _D1 Represents the direction from the metal M to the first atom a-I, and the vector V _D1 Value D of (2) ¹ Represents a metal M and a first substituent R ^I a-I, the first atom a-I of the group. V (V) _D2 Representing the direction from the metal M to the first atom a-IIAnd vector V _D2 Value D of (2) ² Represents a metal M and a second substituent R ^II a-II, the first atom a-II. V (V) _D3 Represents the direction from the metal M to the first atom a-III, and the vector V _D3 Value D of (2) ³ Represents a metal M and a third substituent R ^III a-III, and a linear distance between the first atoms a-III.

In such compound, a sphere having a radius R is defined, with the center being the metal M and the radius R being that which allows the sphere to enclose a compound other than the substituent R ^I 、R ^II And R is ^III A minimum radius of all atoms of a portion of (a); and wherein D ¹ 、D ² And D ³ At least one of which is larger than the radius r by at leastIn some embodiments, D ¹ 、D ² And D ³ At least 2.9, 3.0, 4.3, 4.4, 5.2, 5.9, 7.3, 8.8, 10.3, 13.1, 17.6 or +.>

In some embodiments of such compounded compounds, the compounds have a transition dipole moment axis, and the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 The angle between which is defined, wherein the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least one angle therebetween is less than 40 °. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least one angle therebetween is less than 30 °. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least one angle therebetween is less than 20. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least one angle therebetween is less than 15 °. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least one small angle therebetweenAt 10 deg.. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least two angles therebetween being less than 20. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least two angles therebetween being less than 15. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 At least two angles therebetween being less than 10.

In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 All three angles in between are less than 20 °. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 All three angles in between are less than 15 °. In some embodiments, the transition dipole moment axis is aligned with vector V _D1 、V _D2 And V _D3 All three angles in between are less than 10 °.

In some embodiments of such compounded compounds, the compounds have a Vertical Dipole Ratio (VDR) of 0.33 or less. In some embodiments of such compounded compounds, the compounds have a VDR of 0.30 or less. In some embodiments of such compounded compounds, the compounds have a VDR of 0.25 or less. In some embodiments of such compounded compounds, the compounds have a VDR of 0.20 or less. In some embodiments of such compounded compounds, the compounds have a VDR of 0.15 or less.

The meaning of the term transition dipole moment axis of a compound and the perpendicular dipole ratio of the compound will be readily understood by those of ordinary skill in the art. However, the meaning of these terms can be found in U.S. patent No. 10,672,997, the disclosure of which is incorporated herein by reference in its entirety. In U.S. patent No. 10,672,997, the Horizontal Dipole Ratio (HDR) of a compound is discussed instead of VDR. However, one skilled in the art will readily appreciate that vdr=1-HDR.

C. OLED and device of the present disclosure

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

In some embodiments, an OLED comprises: an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a metal having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (a).

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 emissive layer includes one or more quantum dots.

In some embodiments, the organic layer may further comprise a host, wherein the host comprises a triphenylene comprising a benzofused thiophene or benzofused furan, wherein any substituent in the host is a non-fused substituent independently selected from the group consisting of: c (C) _n H _2n+1 、OC _n H _2n+1 、OAr ₁ 、N(C _n H _2n+1 ) ₂ 、N(Ar ₁ )(Ar ₂ )、CH＝CH-C _n H _2n+1 、C≡CC _n H _2n+1 、Ar ₁ 、Ar ₁ -Ar ₂ 、C _n H _2n -Ar ₁ Or unsubstituted, wherein n is an integer from 1 to 10; and wherein Ar is ₁ With Ar ₂ Independently 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 group selected from the group consisting of: triphenylene, carbazole, indolocarbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, 5λ2-benzo [ d ] benzo [4,5] imidazo [3,2-a ] imidazole, 5, 9-dioxa-13 b-boronaphtho [3,2,1-de ] anthracene, triazine, boryl, silyl, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, aza-5λ2-benzo [ d ] benzo [4,5] imidazo [3,2-a ] imidazole and aza- (5, 9-dioxa-13 b-boronaphtho [3,2,1-de ] anthracene.

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

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and combinations thereof.

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

In some embodiments, the emissive layer may comprise two hosts: a first body and a second body. In some embodiments, the first body is a hole transporting body and the second body is an electron transporting body. In some embodiments, the first host and the second host may form an exciplex.

In some embodiments, a compound as described herein may be a sensitizer; wherein the device may further comprise a recipient; 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 OLED of the present disclosure may further comprise an emissive region containing a compound as disclosed in the above compound portion of the present disclosure.

In some embodiments, the emissive region can comprise a light emitting device having the formula Ir (L) _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (a).

In some embodiments, at least one of the anode, cathode, or new layer disposed over the organic emissive layer serves as the enhancement layer. The enhancement layer includes a plasmonic material exhibiting surface plasmon resonance, the plasmonic material non-radiatively coupled to the emitter material and transferring excited state energy from the emitter material to a non-radiative mode of surface plasmon polaritons. The enhancement layer is disposed no further than a threshold distance from the organic emissive layer, wherein the emitter material has a total non-radiative decay rate constant and a total radiative decay rate constant due to the presence of the enhancement layer, and the threshold distance is where the total non-radiative decay rate constant is equal to the total radiative decay rate constant. In some embodiments, the OLED further comprises an outcoupling layer. In some embodiments, the outcoupling layer is disposed on the enhancement layer on an opposite side of the organic emissive layer. In some embodiments, the outcoupling layer is disposed on the opposite side of the emission layer from the enhancement layer, but is still able to outcouple energy from the surface plasmon mode of the enhancement layer. The outcoupling layer scatters energy from the surface plasmon polaritons. In some embodiments, this energy is scattered into free space as photons. In other embodiments, energy is scattered from surface plasmon modes of the device into other modes, such as, but not limited to, an organic waveguide mode, a substrate mode, or another waveguide mode. If the energy is scattered to the non-free space mode of the OLED, other outcoupling schemes may be incorporated to extract the energy into free space. In some embodiments, one or more intervening layers may be disposed between the enhancement layer and the outcoupling layer. Examples of intervening layers may be dielectric materials, including organic, inorganic, perovskite, oxides, and may include stacks and/or mixtures of these materials.

The enhancement layer alters the effective properties of the medium in which the emitter material resides, causing any or all of the following: reduced emissivity, altered emission linearity, altered emission intensity with angle, altered emitter material stability, altered OLED efficiency, and reduced OLED device roll-off efficiency. Placing the enhancement layer on the cathode side, the anode side, or both sides creates an OLED device that takes advantage of any of the effects described above. In addition to the specific functional layers mentioned herein and illustrated in the various OLED examples shown in the figures, an OLED according to the present disclosure may also include any other functional layers common in OLEDs.

The enhancement layer may comprise a plasmonic material, an optically active super-structured material or a hyperbolic super-structured material. As used herein, a plasmonic material is a material in which the real part of the dielectric constant crosses zero in the visible or ultraviolet region of the electromagnetic spectrum. In some embodiments, the plasmonic material comprises at least one metal. In such embodiments, the metal may include at least one of the following: ag. Al, au, ir, pt, ni, cu, W, ta, fe, cr, mg, ga, rh, ti, ru, pd, in, bi, ca, alloys or mixtures of these materials, and stacks of these materials. Generally, a metamaterial is a medium composed of different materials, wherein the overall effect of the medium is different from the sum of its material portions. In particular, we define an optically active super-structured material as a material having both negative permittivity and negative permeability. On the other hand, hyperbolic metamaterials are anisotropic media in which the permittivity or permeability has different signs for different spatial directions. Optically active and hyperbolic metamaterials are very different from many other photonic structures, such as distributed Bragg reflectors (Distributed Bragg Reflector, "DBRs"), because the medium should exhibit uniformity in the direction of propagation over the length scale of the wavelength of light. Using terms that will be understood by those skilled in the art: the dielectric constant of a metamaterial in the propagation direction can be described by an effective dielectric approximation. Plasmonic and super-structured materials provide a method for controlling light propagation that can enhance OLED performance in a variety of ways.

In some embodiments, the enhancement layer is provided as a planar layer. In other embodiments, the enhancement layer has wavelength-sized features that are periodically, quasi-periodically, or randomly arranged, or sub-wavelength-sized features that are periodically, quasi-periodically, or randomly arranged. In some embodiments, the wavelength-sized features and the sub-wavelength-sized features have sharp edges.

In some embodiments, the outcoupling layer has wavelength-sized features that are periodically, quasi-periodically, or randomly arranged, or sub-wavelength-sized features that are periodically, quasi-periodically, or randomly arranged. In some embodiments, the outcoupling layer may be composed of a plurality of nanoparticles, and in other embodiments, the outcoupling layer is composed of a plurality of nanoparticles disposed over the material. In these embodiments, the outcoupling may be adjusted by at least one of the following means: changing the size of the plurality of nanoparticles, changing the shape of the plurality of nanoparticles, changing the material of the plurality of nanoparticles, adjusting the thickness of the material, changing the refractive index of the material or an additional layer disposed on the plurality of nanoparticles, changing the thickness of the reinforcing layer, and/or changing the material of the reinforcing layer. The plurality of nanoparticles of the device may be formed from at least one of: a metal, a dielectric material, a semiconductor material, a metal alloy, a mixture of dielectric materials, a stack or layering of one or more materials and/or a core of one type of material and a shell coated with another type of material. In some embodiments, the outcoupling layer is composed of at least metal nanoparticles, wherein the metal is selected from the group consisting of: ag. Al, au, ir, pt, ni, cu, W, ta, fe, cr, mg, ga, rh, ti, ru, pd, in, bi, ca, alloys or mixtures of these materials, and stacks of these materials. The plurality of nanoparticles may have additional layers disposed over them. In some embodiments, the polarization of the emission may be adjusted using an outcoupling layer. Changing the size and periodicity of the outcoupling layer may select the type of polarization that preferentially outcouples to air. In some embodiments, the outcoupling layer also serves as an electrode of the device.

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 may comprise a compound as disclosed in the above compound section of the disclosure.

In some embodiments, the consumer product comprises an OLED having an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer can comprise a material having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (a).

In some embodiments, the consumer product may be one of the following products: flat panel 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, laser printers, telephones, cellular telephones, tablet computers, tablet handsets, personal Digital Assistants (PDAs), wearable devices, laptop computers, digital cameras, video cameras, viewfinders, micro-displays with a diagonal of less than 2 inches, 3-D displays, virtual or augmented reality displays, vehicles, video walls comprising a plurality of displays tiled together, theatre or gym screens, phototherapy devices, and billboards.

In general, an OLED includes at least one organic layer disposed between and electrically connected to an anode and a cathode. When a 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 localized on the same molecule, an "exciton" is formed, which is a localized electron-hole pair having an excited energy state. Light is emitted when the exciton relaxes through a light emission mechanism. In some cases, excitons may be localized on an excimer or 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.

Initial OLEDs used emissive molecules that emitted light ("fluorescence") from a singlet state, 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 time frames less than 10 nanoseconds.

Recently, OLEDs have been demonstrated that have emissive materials that emit light from a triplet state ("phosphorescence"). Baldo et al, "efficient phosphorescent emission from organic electroluminescent devices (Highly Efficient Phosphorescent Emission from Organic Electroluminescent Devices)", nature, vol.395, 151-154,1998 ("Baldo-I"); and Bardo et al, "Very efficient green organic light emitting device based on electrophosphorescence (Very high-efficiency green organic light-emitting devices based on electrophosphorescence)", applied physical fast report (appl. Phys. Lett.), vol.75, stages 3,4-6 (1999) ("Bardo-II"), incorporated by reference in its 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 drawn to scale. The device 100 may include a substrate 110, an anode 115, a hole injection layer 120, a hole transport layer 125, an electron blocking layer 130, an emissive layer 135, a hole blocking layer 140, an electron transport layer 145, an electron injection layer 150, a protective layer 155, a cathode 160, and a 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 at columns 6-10, which is incorporated by reference.

Further examples of each of these layers are available. For example, a flexible and 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 in a 50:1 molar ratio ₄ m-MTDATA of TCNQ, as disclosed in U.S. patent application publication No. 2003/0239980, 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 in 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. Examples of cathodes are disclosed in U.S. Pat. Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entirety, that include composite cathodes having a thin layer of metal (e.g., mg: ag) containing an overlying transparent, electrically conductive, sputter-deposited ITO layer. The theory and use of barrier layers is described in more detail in U.S. Pat. No. 6,097,147 and U.S. patent application publication No. 2003/0230980, which are incorporated by reference in their entirety Incorporated in the manner used. Examples of implanted layers are provided in U.S. patent application publication No. 2004/0174116, which is incorporated by reference in its entirety. A description of protective layers can 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 the device 200 has a cathode 215 disposed below an anode 230, the device 200 may be referred to as an "inverted" OLED. Materials similar to those described with respect to device 100 may be used in the corresponding layers of device 200. Fig. 2 provides one example of how some layers may be omitted from the structure of the apparatus 100.

The simple layered structure illustrated in fig. 1 and 2 is provided by way of non-limiting example, and it should be understood that embodiments of the present disclosure may be used in conjunction with a variety of 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 should be understood that combinations of materials may be used, such as mixtures of host and dopant, or more generally, mixtures. Further, the layers may have various sublayers. 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, such as OLEDs (PLEDs) comprising polymeric materials, such as disclosed in frank (Friend) et al, U.S. patent No. 5,247,190, which is incorporated by reference in its entirety, may also be used. By way of another example, an OLED with a single organic layer may be used. The OLEDs can be stacked, for example, as described in U.S. patent No. 5,707,745 to 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, such as a mesa structure as described in U.S. Pat. No. 6,091,195 to Furster et al, and/or a pit structure as described in U.S. Pat. No. 5,834,893 to Boolean 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. Preferred methods for the organic layer include thermal evaporation, ink jet (as described in U.S. Pat. Nos. 6,013,982 and 6,087,196, incorporated by reference in their entirety), organic vapor deposition (OVPD) (as described in U.S. Pat. No. 6,337,102, incorporated by reference in its entirety), and deposition by organic vapor jet printing (OVJP, also known as Organic Vapor Jet Deposition (OVJD)), 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 under nitrogen or an inert atmosphere. For other layers, the preferred method includes thermal evaporation. Preferred patterning methods include deposition through a mask, cold welding (as described in U.S. patent nos. 6,294,398 and 6,468,819, 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 that are branched or unbranched and preferably contain at least 3 carbons can be used in small molecules to enhance their ability to withstand solution processing. Substituents having 20 carbons or more may be used, and 3 to 20 carbons are a preferred range. A material with an asymmetric structure may have better solution processibility than a material with a symmetric structure because an asymmetric material 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 purpose of the barrier layer is to protect the electrodes and organic layers from harmful substances exposed to the environment including moisture, vapors and/or gases, etc. The barrier layer may be deposited on the substrate, electrode, under or beside the substrate, electrode, or on any other portion 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 a composition having a single phase and a composition having multiple phases. Any suitable material or combination of materials may be used for the barrier layer. The barrier layer may incorporate inorganic compounds or organic compounds 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 No. PCT/US2007/023098, and PCT/US2009/042829, which are incorporated herein by reference in their entirety. To be considered as 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 and non-polymeric materials consists essentially of polymeric silicon and inorganic silicon.

Devices manufactured in accordance with 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., that may be utilized by end user product manufacturers. The electronics assembly 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. Disclosed is a consumer product comprising an OLED comprising a compound of the present disclosure in an organic layer in the OLED. The consumer product should include any kind of product that contains 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, micro-displays (displays with a diagonal of less than 2 inches), 3-D displays, virtual or augmented reality displays, vehicles, video walls including a plurality of tiled displays, theatre or gym screens, phototherapy devices, and signs. Various control mechanisms may be used to control devices manufactured 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 ℃).

Further 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 in 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, crimpable, collapsible, 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 fluorescent emitter. In some embodiments, the OLED includes 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 an illumination panel.

In some embodiments, the compound may be an emissive dopant. In some embodiments, the compounds may produce emissions via phosphorescence, fluorescence, thermally activated delayed fluorescence (i.e., TADF, also known as delayed fluorescence of type E, see, e.g., U.S. application No. 15/700,352, which is incorporated herein by reference in its entirety), triplet-triplet annihilation, or combinations 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 (identical for each ligand). In some embodiments, the compounds may be compounded (at least one ligand is different from the others). In some embodiments, when there is more than one ligand coordinated 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 coordinated to the metal may be linked to other ligands coordinated 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 linking ligands may be different from the other ligand(s).

In some embodiments, the compounds may be used as a phosphor-photosensitizing agent in an OLED, where one or more layers in the OLED contain receptors in the form of one or more fluorescent and/or delayed fluorescent emitters. In some embodiments, the compound may be used as a component of an exciplex to be used as a sensitizer. As a phosphorus photosensitizer, the compound must be able to transfer energy to the acceptor and the acceptor will emit energy or further transfer energy to the final emitter. The receptor concentration may be in the range of 0.001% to 100%. The acceptor may be in the same layer as the phosphorus photosensitizer 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, acceptor, and 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, electronics assembly modules, and lighting panels. The organic layer may be an emissive layer, and the compound may be an emissive dopant in some embodiments, and the compound may be a non-emissive dopant in other embodiments.

In yet another aspect of the invention, a formulation comprising the novel compounds disclosed herein is described. The formulation may comprise one or more 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 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 the same moiety as the compound but with one hydrogen removed and replaced with a bond to the rest of the chemical structure. As used herein, "multivalent variant of a compound" refers to a moiety that is identical to the 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 present invention may also be incorporated into supramolecular complexes without covalent bonds.

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

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

a) Conductive dopants:

the charge transport layer may be doped with a conductive dopant to substantially change its charge carrier density, which in turn will change its conductivity. Conductivity is increased by the generation of charge carriers in the host material and, depending on the type of dopant, a change in Fermi level (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 conductive dopants that can be used in OLEDs in combination with the materials disclosed herein are exemplified below along with references disclosing those materials: EP01617493, EP01968131, EP2020694, EP2684932, US20050139810, US20070160905, US20090167167, US2010288362, WO06081780, WO2009003455, WO2009008277, WO2009011327, WO2014009310, US2007252140, US2015060804, US20150123047 and US2012146012.

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 a hole injection/transport material. Examples of materials include (but are not limited to): phthalocyanines or porphyrin derivatives; aromatic amine derivatives; indolocarbazole derivatives; a fluorocarbon-containing polymer; a polymer having a conductive dopant; conductive polymers such as PEDOT/PSS; self-assembled monomers derived from compounds such as phosphonic acids and silane derivatives; metal oxide derivatives, e.g. MoO _x The method comprises the steps of carrying out a first treatment on the surface of the p-type semiconducting organic compounds such as 1,4,5,8,9, 12-hexaazatriphenylene hexacarbonitrile; a metal complex; a crosslinkable compound.

Examples of aromatic amine derivatives for the HIL or HTL include, but are not limited to, the following general structures:

Ar ¹ to Ar ⁹ Is selected from: a group consisting of, for example, the following aromatic hydrocarbon cyclic compounds: benzene, biphenyl, triphenylene, naphthalene, anthracene, benzene, phenanthrene, fluorene, pyrene, and the like,Perylene and azulene; a group consisting of aromatic heterocyclic compounds such as: dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole pyrrolo-bipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, Oxathiazines, oxadiazines, indoles, benzimidazoles, indazoles, indolizines, benzoxazoles, benzisoxazoles, benzothiazoles, quinolines, isoquinolines, cinnolines, quinazolines, quinoxalines, naphthyridines, phthalazines, pteridines, xanthenes, acridines, phenazines, phenothiazines, phenoxazines, benzofuranopyridines, furandipyridines, benzothiophenopyridines, thienodipyridines, benzoselenophenopyridines, and selenophenodipyridines; and a group consisting of 2 to 10 cyclic structural units which are the same type or different types of groups selected from an aromatic hydrocarbon ring group and an aromatic heterocyclic group 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, phosphino, and combinations thereof.

In one aspect, ar ¹ To Ar ⁹ Independently selected from the group consisting of:

wherein k is an integer from 1 to 20; x is X ¹⁰¹ To X ¹⁰⁸ Is C (including CH) or N; z is Z ¹⁰¹ Is NAr ¹ O or S; ar (Ar) ¹ Having the same groups as defined above.

Examples of metal complexes used in the HIL or HTL include, but are not limited to, the following general formula:

wherein Met is a metal that may have an atomic weight greater than 40; (Y) ¹⁰¹ -Y ¹⁰² ) Is double in structureTooth ligand, Y ¹⁰¹ And Y ¹⁰² Independently selected from C, N, O, P and S; l (L) ¹⁰¹ Is an auxiliary ligand; k' is an integer value of 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 -Y ¹⁰² ) Is a 2-phenylpyridine derivative. In another aspect, (Y) ¹⁰¹ -Y ¹⁰² ) Is a carbene ligand. In another aspect, met is selected from Ir, pt, os, and Zn. In another aspect, the metal complex has a chemical structure as compared to an Fc ⁺ The 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 an OLED in combination with the materials disclosed herein are exemplified with references disclosing those materials as follows: CN, DE, EP EP, JP07-, JP EP, EP JP07-, JP US, US US, WO US, US WO, WO.

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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 than a similar device lacking such a barrier layer. Furthermore, a blocking layer may be used to limit the emission to a 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 vacuum level) and/or higher triplet energy than one or more of the hosts 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 greater than that of the dopant. Any host material may be used with any dopant so long as the triplet criteria are met.

Examples of metal complexes used as hosts preferably have the general formula:

wherein Met is a metal; (Y) ¹⁰³ -Y ¹⁰⁴ ) Is a bidentate ligand, Y ¹⁰³ And Y ¹⁰⁴ Independently selected from C, N, O, P and S; l (L) ¹⁰¹ Is another ligand; k' is an integer value of 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 -Y ¹⁰⁴ ) Is a carbene ligand.

In one aspect, the host compound contains at least one selected from the group consisting of: a group consisting of, for example, the following aromatic hydrocarbon cyclic compounds: benzene, biphenyl, triphenylene, tetramethylene, 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, indolocarbazoleA combination of at least one of the following compounds selected from the group consisting of pyridylindole, pyrrolodipyridine, 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, benzofuranopyridine, furandipyridine, benzothiophenopyridine, thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine; and a group consisting of 2 to 10 cyclic structural units which are the same type or different types of groups selected from an aromatic hydrocarbon ring group and an aromatic heterocyclic group 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, 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.

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

wherein R is ¹⁰¹ Selected 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 as Ar mentioned above. k is an integer from 0 to 20 or from 1 to 20. X is X ¹⁰¹ To X ¹⁰⁸ Independently selected from C (including CH) or N. Z is Z ¹⁰¹ And Z ¹⁰² Independently selected from NR ¹⁰¹ O 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: US, WO WO, WO-based US, WO WO, US, US and US,

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e) Other emitters:

one or more other emitter dopants may be used in combination with the compounds of the present invention. Examples of other emitter dopants 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 emissions via phosphorescence, fluorescence, thermally activated delayed fluorescence (i.e., TADF, also known as E-delayed fluorescence), triplet-triplet annihilation, or combinations of these processes.

Non-limiting examples of emitter materials that can be used in OLEDs in combination with the materials disclosed herein are exemplified below along with references disclosing those materials: CN, EB, EP 1239526, EP, JP, KR TW, US20010019782, US TW, US20010019782, US US, US US, WO US, US US, WO.

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f)HBL：

A Hole Blocking Layer (HBL) 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 than a similar device lacking the barrier layer. Furthermore, a blocking layer may be used to limit the emission to a 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 molecules or the same functional groups as used in the host described above.

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

wherein k is an integer from 1 to 20; l (L) ¹⁰¹ Is another ligand, and k' is an integer from 1 to 3.

g)ETL：

An 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 compounds used in ETL contain in the molecule at least one of the following groups:

wherein R is ¹⁰¹ Selected 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, when aryl or heteroaryl, have similar definitions as for Ar described above. Ar (Ar) ¹ To Ar ³ Has a similar definition to Ar mentioned above. k is an integer of 1 to 20. X is X ¹⁰¹ To X ¹⁰⁸ Selected from C (including CH) or N.

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

wherein (O-N) or (N-N) is a bidentate ligand having a metal coordinated to atom O, N or N, N; l (L) ¹⁰¹ Is another ligand; k' is an integer value from 1 to the maximum number of ligands that can be attached to the metal.

Non-limiting examples of ETL materials that can be used in an OLED in combination with the materials disclosed herein are exemplified below along with references disclosing those materials: CN103508940, EP01602648, EP01734038, EP01956007, JP2004-022334, JP2005149918, JP2005-268199, KR0117693, KR20130108183, US20040036077, US20070104977, US2007018155, US20090101870, US20090115316, US20090140637, US20090179554, US2009218940, US2010108990, US2011156017, US2011210320, US2012193612, US2012214993, US2014014925, US2014014927, US20140284580, US6656612, US8415031, WO2003060956, WO2007111263, WO2009148269, WO2010067894, WO2010072300, WO2011074770, WO2011105373, WO2013079217, WO2013145667, WO2013180376, WO2014104499, WO2014104535,

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h) Charge Generation Layer (CGL)

In tandem or stacked OLEDs, CGL plays a fundamental role in performance, consisting of n-doped and p-doped layers for injecting electrons and holes, respectively. Electrons and holes are supplied by the CGL and the electrode. Electrons and holes consumed in the CGL are refilled with 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. The minimum amount of deuterated hydrogen in the compound is selected from the group consisting of: 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99% and 100%. 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 (e.g., without limitation, alkyl, aryl, cycloalkyl, heteroaryl, etc.) can also be in their non-deuterated, partially deuterated, and fully deuterated forms.

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 include 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 the various theories as to why the present invention works are not intended to be limiting.

Experimental data

Synthesis of comparative Compound 1

1- (4- (tert-butyl) naphthalen-2-yl) -6-chloroisoquinoline: 2M aqueous potassium carbonate (250 mL,2 eq) was added to a suspension of 1, 6-dichloro-isoquinoline (50 g,252mmol,1.0 eq) and 3-tert-butylnaphthyl-1-boronic acid pinacol ester (86 g,278mmol,1.1 eq) in 1, 4-dioxane (500 mL) and the mixture sparged with nitrogen for 5 minutes. Tetrakis (triphenylphosphine) palladium (0) (11.8 g,10.1mmol,4 mol%) was added and the mixture was bubbled with nitrogen for 5 minutes, followed by heating at reflux for 18 hours. The mixture was quenched with saturated aqueous sodium sulfite (200 mL), cooled to room temperature, the layers were separated, and the aqueous layer was extracted with ethyl acetate (200 mL). The combined organic extracts were washed with brine (2×200 mL), dried over sodium sulfate, filtered, and concentrated under reduced pressure to give a dark orange solid. The crude material (106 g) was chromatographed on silica gel (1.1 kg), eluting with 0 to 10% ethyl acetate in heptane, to give 1- (4- (tert-butyl) naphthalen-2-yl) -6-chloroisoquinoline as a pale yellow solid (63.4 g,67% yield).

Cyclopentyl zinc bromide

Anhydrous lithium chloride (63.6 g,1.5mol,1.5 eq., aldrich Redi-Dri 99%) and zinc powder, <10 μm (97.9 g,1.5mol,1.5 eq.) were added to a 5l 4 neck flask equipped with a condenser, overhead stirrer and thermocouple. Anhydrous tetrahydrofuran (1.0L) was added and the suspension stirred for 10 to 20 minutes. 1, 2-dibromoethane (3.5 mL,30mmol,0.03 eq.) was added and the suspension heated to reflux. The mixture was cooled to about 40 ℃, chlorotrimethylsilane (1.3 ml,10mmol,0.01 eq.) was added and small amounts of iodine crystals were added. The heating mantle was changed and a solution of bromocyclopentane (149 g,1mol,1.0 eq) in anhydrous tetrahydrofuran (100 mL) was slowly added over 15 minutes, maintaining the temperature between 40 ℃ and 50 ℃. The next day, stirring was stopped to precipitate some solids. The molar concentration of the solution was determined by quenching a known amount of iodine in anhydrous tetrahydrofuran.

1- (4- (tert-butyl) naphthalen-2-yl) -6-cyclopentylisoquinoline: a solution of 1- (4- (tert-butyl) naphthalen-2-yl) -6-chloroisoquinoline (57.9 g, 67mmol,1.0 eq.), 2-dicyclohexyl-phosphino-2 ',6' -dimethoxydiphenyl (SPhos) (4.12 g,9.8mmol,0.06 eq.) and palladium (II) acetate (1.13 g,4.9mmol,0.03 eq.) in anhydrous tetrahydrofuran (700 mL) was warmed to about 35 ℃, the heating mantle removed and 0.6M cyclopentylzinc bromide/lithium chloride-containing THF (300 mL,180mmol,1.04 eq.) was slowly added over 25 minutes, the temperature was maintained below 50℃at which point the reaction stopped to give rise to an exotherm and darkened/darkened during the last 10mL addition. NMR analysis showed complete consumption of the starting chloride, desired product and-3% of the dechlorinated adduct. A1:1 mixture of saturated aqueous sodium sulfite and saturated aqueous sodium bicarbonate (500 mL) was added and the mixture was stirred for 30 minutes. The suspension was filtered through celite (200 g) and washed with ethyl acetate (3X 200 mL). The layers were separated and the aqueous phase was extracted with ethyl acetate (300 mL). The combined organic extracts were washed with brine (200 mL), dried over sodium sulfate, filtered and concentrated under reduced pressure to a brown oil. A solution of the oil in 10% ethyl acetate/heptane (500 mL) was filtered through a pad of silica gel (200 g), rinsing with 10% ethyl acetate/heptane (3X 150 mL). The filtrate was concentrated to give 1- (4- (tert-butyl) naphthalen-2-yl) -6-cyclopentylisoquinoline (52.9 g,81% yield) as an orange glass.

Catalytic transfer hydrogenation: 10% palladium on carbon (2.5 g,50% wet) and ammonium formate (4.1 g,0.5 eq) were added to a solution of orange glass (52.9 g,140mmol,1.0 eq) in toluene (750 mL) and the reaction mixture was heated at 80 ℃ for 18 hours. The suspension was cooled to 50 ℃, filtered through celite under a nitrogen blanket, rinsed with toluene (2×150 mL), and the filtrate concentrated. Heptane (500 mL) and SiliaMetS thiol resin (11 g) were added and the suspension heated at 40 ℃ for 30 minutes. The suspension was chromatographed on silica gel (500 g), eluting with 0 to 10% ethyl acetate in heptane, to give 1- (4- (tert-butyl) naphthalen-2-yl) -6-cyclopentylisoquinoline as a white solid (41 g,64% overall yield).

Di-mu-chloro-tetra [ (1- (4-tert-butyl) naphthalen-2-yl) -1' -yl) -6-cyclopentylisoquinolin-2-yl]Diiridium (I)II): 1- (4- (tert-butyl) naphthalen-2-yl) -6-cyclopentylisoquinoline (37.5 g,98.7mmol,2.1 eq.), 2-ethoxyethanol (705 mL), and DIUF water (175 mL) were bubbled with nitrogen for 5 min. Iridium (III) chloride hydrate (14.9 g,47.0mmol,1.0 eq.) was added and bubbling continued for 5 min, then the reaction mixture was heated at 80℃for 72 hours. Aliquoting of the sample ¹ H NMR analysis showed about 80% conversion to product. The reaction mixture was cooled to about 55 ℃ and filtered. The solid is dried under nitrogen for 3 hours to give crude di- μ -chloro-tetra [ (1- (4-tert-butyl) naphthalen-2-yl) -1-yl) -6-cyclopentylisoquinolin-2-yl) as a pale red solid with residual solvent ]Diiridium (III) (about 40 g).

Bis [ (1- (4-tert-butyl) naphthalen-2-yl) -1-yl) -6-cyclopentylisoquinolin-2-yl)]- (3, 7-diethyl-4, 6-nonanedione-k) ₂ O, O') iridium (III): crude di- μ -chloro-tetrakis [ (1- (4-tert-butyl) naphthalen-2-yl) -1' -yl) -6-cyclopentylisoquinolin-2-yl]A solution of iridium (III) (37.0 g,37.6mmol,1.0 eq.) and 3, 7-diethylnonane-4, 6-dione (16.0 g,75.2mmol,2.0 eq.) in 2-ethoxyethanol (750 mL) was bubbled with nitrogen for 5 minutes, powdered potassium carbonate (10.4 g,75.2mmol,2.0 eq.) was added and the bubbling continued for 5 minutes. The reaction mixture was stirred at 50 ℃ for 48 hours in a flask wrapped in aluminum foil. DIUF water (750 mL) was added, the suspension stirred for 20 min, filtered and the residue washed with aqueous wash (500 mL). The viscous solid was slurried in methanol (700 mL) followed by filtration for 10 minutes. The red solid was dissolved/suspended in 50% dichloromethane/hexane (200 mL) and the slurry was directly loaded onto a column of silica gel (900 g) topped with basic alumina (100 g) and eluted with 30% dichloromethane/hexane (7L). The clean product fractions were concentrated. The solid was wet-milled with methanol (300 mL) at 45 ℃ for 2 hours, filtered and dried under high vacuum overnight at 50 ℃ to give bis [ (1- (4-tert-butylnaphthalen-2-yl) -1' -yl) -6-cyclopentylisoquinolin-2-yl) as a red solid ]- (3, 7-diethyl-4, 6-nonanedione-k) ₂ O, O') Iridium (III) (37 g,71% overall yield, 99.3% UPLC purity).

Synthesis of Compound 1 of the present invention

Synthesizing 3-hydroxynaphthalene-1-carbonitrile: palladium diacetate (301.9 mg,0.03 eq, 1.345 mmol), potassium ferrocyanide trihydrate (4.284 g,0.25 eq, 11.21 mmol) and sodium carbonate (4.751 g,1.00eq,44.83 mmol) were added to a reaction vessel with a stirring rod. The vessel was evacuated and filled with nitrogen. N, N-dimethylformamide (85.00 mL) containing 4-bromonaphthalen-2-ol (10.00 g,1.00eq,44.83 mmol) was added under nitrogen. The reaction mixture was stirred at 120 ℃ and the reaction was monitored for starting material consumption by LCMS for 8 hours. The reaction crude was then cooled to room temperature and filtered through a pad of Celite (i.e., celite (diatomaceous earth)). The filtrate was concentrated in vacuo. The crude material was purified by flash column chromatography (SiliaSep 220g, ethyl acetate/heptane, 0% to 20%,12CV, eluting at 20%) to give 3-hydroxynaphthalene-1-carbonitrile (6.800 g,40.19mmol, 90%). ¹ H NMR(CDCL3,396MHz)δ[ppm]8.14(d,1H,J＝9.1Hz),7.76(d,1H,J＝7.3Hz),7.5-7.6(m,3H),7.4-7.4(m,1H),5.60(br s,1H)。LCMS m/z[M+H] ^- 168.0。

Synthesis of 4-cyanonaphthalen-2-yl triflate: diisopropylethylamine (24.0 mL,1.5 eq, 136.5 mmol) was added dropwise to a reaction vessel containing a solution of 3-hydroxy-1-naphthalene carbonitrile (15.40 g,1.0 eq, 91.03 mmol) and phenyl trifluoromethanesulfonate (35.0 g,1.1 eq, 100.1 mmol) in acetonitrile (180.0 mL) at room temperature. The solution was then allowed to stir at room temperature for 2 hours. The reaction crude material was concentrated in vacuo and purified by flash chromatography (SiliaSep 220g, ethyl acetate/heptane 0% to 15%12cv eluting with 10% ethyl acetate) to give 4-cyanonaphthalen-2-yl triflate (19.15 g,63.57mmol, 70%) as a yellow oil. ¹ H NMR(396MHz,CDCL3)δ[ppm]8.31(s,1H),8.29(s,1H),8.28-8.32(m,1H),8.01-8.03(m,1H),8.00-8.02(m,1H),7.98(s,1H),7.97-8.01(m,1H),7.79-7.82(m,1H),7.83(s,1H),7.77(s,1H),7.75(s,1H),7.73(s,1H)。

Synthesis of 3- (4, 5-tetramethyl-1, 3, 2-dioxapentaborane-2-yl) -1-naphthalonitrile: adding to a reactor with stirring bars4-cyanonaphthalen-2-yl triflate (19.15 g,1.0 eq, 63.57 mmol), bis (pinacolato) diborane (17.76 g,1.1 eq, 69.93 mmol), potassium acetate (18.72 g,11.9mL,3.0 eq, 190.7 mmol) and Pd (dppf) Cl were added ₂ DCM (1.557 g,0.03 eq, 1.907 mmol) and placed under nitrogen. Dioxane (255 mL) was added to the vessel and the reaction was heated to 80 ℃ for 3 hours. The reaction crude material was cooled to room temperature and filtered over a celite pad eluting with TBME. The filtrate was concentrated in vacuo and the crude material purified by flash chromatography (SiliaSep 330g, ethyl acetate/heptane, 0% to 10% ethyl acetate, 9CV eluting with 5% ethyl acetate) to give 3- (4, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -1-naphthyridine (13.70 g,49.08mmol, 77%) as a yellow wax. ¹ H NMR(396MHz,CDCL3)δppm 8.54(s,1H)8.27(s,1H)8.22(d,J＝8.48Hz,1H)7.95(d,J＝8.48Hz,1H)7.69-7.74(m,1H)7.58-7.64(m,1H)1.38(s,12H)。

3- (4, 5-tetramethyl-1, 3, 2-dioxapentaborane-2-yl) -1-naphthalonitrile and 1, 6-dichloro-isoquinoline in the presence of Pd (PPh) ₃ ) ₄ In DME, 3- (6-chloroisoquinolin-1-yl) -1-naphthalonitrile is formed. Coupling this chloride with cyclopentylzinc bromide under the conditions described for the synthesis of comparative compound 1 forms 3- (6-cyclopentylisoquinolin-1-yl) -1-naphthalonitrile. Further conjugation and formation of compound 1 of the present invention was performed under the same conditions as described above for comparative compound 1.

The compounds of the invention and the comparative compounds were evaluated computationally. Calculations were performed using the B3LYP functional with CEP-31G basis. Geometric optimization was performed in vacuo. Excitation energies at these optimized geometries were obtained using time-density functional theory (TDDFT). A continuous solvent model was applied to simulate the tetrahydrofuran solvent in the TDDFT calculation. All calculations were performed using the program Gaussian. As will be apparent from the calculation data below, the compounds of the present invention have a moderate to significant red shift in the emission spectrum. Comparative compound 1 had a triplet value of 693nm and comparative compound 2 had a triplet state equal to 685 nm. Compound 1 of the present invention has a triplet state of 632nm and compound 2 of the present invention has a triplet state value of 682nm. As it can be seen that such changes allow the triplet values to be tuned to commercially desirable regions. And the HOMO values varied significantly from-4.92 and-4.97 to-5.15 and-5.45. Such HOMO changes are beneficial to the device architecture because they allow for the use of a variety of common host materials. As can be seen in table 1, the CN group significantly changed the triplet and HOMO values, while the F group significantly changed the HOMO value, but slightly changed the triplet value. Thus, we can conclude that electron withdrawing groups are powerful tools in modulating emitter properties.

Compared to the comparative compound (560 nm), T is clearly desirable ₁ (611 nm) value. This is attributable to the lower calculated LUMO of the compounds of the present invention. The calculated values obtained using the DFT functional nest and the basis set identified above are theoretical values. The computational combination protocol used herein (e.g., gaussian with CEP-31G basis) relies on the following assumptions: the electronic effects are additive and thus can be extrapolated to the Complete Basis Set (CBS) limit using a larger basis set. However, when the aim of the study is to understand HOMO, LUMO, S of a range of structurally related compounds ₁ 、T ₁ The cumulative effect is expected to be similar with variations in bond dissociation energy, etc. Thus, although the absolute error in using B3LYP may be significant compared to other calculation methods, HOMO, LUMO, S calculated using the B3LYP scheme is expected ₁ 、T ₁ The relative difference between the bond dissociation energy values and the experiment can be reproduced very well. See, e.g., hong et al, materials chemistry (chem. Mater.) 2016,28,5791-98,5792-93 and supplemental information (discussing the reliability of DFT calculations in the case of OLED materials). Furthermore, with respect to iridium or platinum complexes suitable for use in the OLED field, the data obtained from DFT calculations are closely related to actual experimental data. See Tagasli et al, J.Material chemistry journal (J.Mater. Chem.) "2012, 22, 6419-29, 6422 (Table 3) (showing DFT calculations closely related to actual data for various emissive complexes); G.R. Mo Leiluo (Morello, G.R.), journal of molecular modeling (J.mol.model.) 2017, 23:174 (study of various DFT functional groups and basis sets and inference that the combination of B3LYP and CEP-31G is particularly accurate for the emissive complex).

Table 1 calculation results

The calculation shows that the introduction of electron withdrawing groups in the emissive ligand molecule causes a blue shift in the emission of the iridium complex. Such blue shifts can be small, medium or quite large, depending on the type of electron withdrawing group, and thus they provide an opportunity for fine tuning of the color of the OLED emitter. Such fine tuning can provide commercially valuable compounds. An additional benefit of such ligand modification is that both HOMO and LUMO values shift to a more negative direction, which can also be beneficial for better fitting to commercial device architectures.

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 therefore include 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 the various theories as to why the present invention works are not intended to be limiting.

Claims

1. A compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z Wherein:

x is 1, 2 or 3;

y is 0, 1 or 2;

z is 0, 1 or 2;

x+y+z＝3；

L _A having the formula IAnd L is of the structure of _B And L _C Each of which is independently doubleA tooth ligand;

part a is a monocyclic or polycyclic fused ring system wherein each ring in the monocyclic or polycyclic fused ring system is independently a 5-or 6-membered carbocyclic or heterocyclic ring;

Z ¹ 、Z ² and Z ³ Each independently is C or N;

L _A can be conjugated with other ligands to form tridentate, tetradentate, pentadentate or hexadentate ligands;

2. The compound according to claim 1, having the formula Ir (L _A ) _x (L _B ) _y Wherein x is 1, 2 or 3; y is 0, 1 or 2; and x+y=3.

3. The compound according to claim 1, wherein Z ¹ Is C and Z ² Is N or Z ¹ Is N and Z ² Is C; and/or wherein part a is an aromatic ring.

4. The compound of claim 1, wherein part a is selected from the group consisting of: benzene, pyridine, pyrimidine, pyridazine, pyrazine, triazine, imidazole, pyrazole, pyrrole, oxazole, furan, thiophene, thiazole, naphthalene, quinoline, isoquinoline, quinazoline, benzofuran, aza-benzofuran, benzoxazole, aza-benzoxazole, benzothiophene, aza-benzothiophene, benzothiazole, benzoselenophene, aza-benzoselenophene, indene, aza-indene, indole, aza-indole, benzimidazole, aza-benzimidazole, carbazole, aza-carbazole, dibenzofuran, aza-dibenzofuran, dibenzothiophene, aza-dibenzothiophene, quinoxaline, phthalazine, phenanthrene, aza-phenanthrene, anthracene, aza-anthracene, phenanthridine, fluorene, and aza-fluorene; and/or

Wherein part B is selected from the group consisting of: naphthalene, quinoline, isoquinoline, quinazoline, benzofuran, aza-benzofuran, benzoxazole, aza-benzoxazole, benzothiophene, aza-benzothiophene, benzothiazole, aza-benzothiazole, benzoselenophene, aza-benzoselenophene, indene, aza-indene, indole, aza-indole, benzimidazole, aza-benzimidazole; and/or

Wherein R is ^A Or R is ^B Independently an electron withdrawing group selected from the group consisting of the following EWG groups: F. CF (compact flash) ₃ 、CN、COCH ₃ 、CHO、COCF ₃ 、COOMe、COOCF ₃ 、NO ₂ 、SF ₃ 、SiF ₃ 、PF ₄ 、SF ₅ 、OCF ₃ 、SCF ₃ 、SeCF ₃ 、SOCF ₃ 、SeOCF ₃ 、SO ₂ F、SO ₂ CF ₃ 、SeO ₂ CF ₃ 、OSeO ₂ CF ₃ 、OCN、SCN、SeCN、NC、 ⁺ N(R) ₃ 、(R) ₂ CCN、(R) ₂ CCF ₃ 、CNC(CF ₃ ) ₂ BRR', substituted or unsubstituted dibenzoborole, 1-substituted carbazole, 1, 9-substituted carbazole, substituted or unsubstituted pyridine, substituted or unsubstitutedSubstituted pyrimidines, substituted or unsubstituted pyrazines, substituted or unsubstituted pyridazines, substituted or unsubstituted triazines, substituted or unsubstituted oxazoles, substituted or unsubstituted benzoxazoles, substituted or unsubstituted thiazoles, substituted or unsubstituted benzothiazoles, substituted or unsubstituted imidazoles, substituted or unsubstituted benzimidazoles, ketones, carboxylic acids, esters, nitriles, isonitriles, sulfinyl, sulfonyl, partially and fully fluorinated alkyl, partially and fully fluorinated aryl, partially and fully fluorinated heteroaryl, cyano-containing alkyl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate,

Wherein each R is independently hydrogen or a substituent selected from the group consisting of the universal substituents defined herein; wherein Y' is selected from the group consisting of: BR (BR) _e 、NR _e 、PR _e 、O、S、Se、C＝O、S＝O、SO ₂ 、CR _e R _f 、SiR _e R _f And GeR _e R _f' The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with

Wherein each R is _e And R is _f Independently hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boron, aralkyl, alkoxy, aryloxy, amino, silyl, germane, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, seleno, and combinations thereof.

5. The compound of claim 1, wherein R ^A At least one of (a) comprisesAn electron withdrawing group consisting of CN, F and a partially or fully deuterated alkyl group; and/or wherein R is ^B Comprises electron withdrawing groups consisting of CN, F and partially or fully deuterated alkyl groups.

6. The compound of claim 1, wherein at least one R ^A A cyclic moiety a' selected from the group consisting of cycloalkyl, aryl, or heteroaryl, any of which may be further substituted; and/or at least one R ^B A cyclic moiety B' which is selected from the group consisting of cycloalkyl, aryl or heteroaryl, any of which may be further substituted.

7. The compound of claim 1, wherein the ligand L _A Selected from the group consisting of:

wherein:

X ₁ to X ₆ Is independently C or N;

each R, R' and R ^BB Independently hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boron, aralkyl, alkoxy, aryloxy, amino, silyl, germanyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, and,Carboxylic acids, ethers, esters, nitriles, isonitriles, thio, sulfinyl, sulfonyl, phosphino, seleno, and combinations thereof;

8. The compound of claim 1, wherein the ligand L _A Selected from the group consisting of:

wherein:

X ₁ to X ₈ Is independently C or N;

Y ^A1 and Y ^B1 Independently selected from the group consisting of: BR, BRR', NR, PR,

P(O)R、O、S、Se、C＝O、C＝S、C＝Se、C＝NR、C＝CRR'、S＝O、SO ₂ 、CR、CRR'、

SiRR 'and GeRR';

R ^AA and R is ^BB Independently represents a single substitution to the maximum allowable substitution or no substitution;

each R, R', R ^AA And R is ^BB Independently hydrogen or a substituent selected from the group consisting of: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boron, aralkyl, alkoxy, aryloxy, amino, silyl, germane, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrileThio, sulfinyl, sulfonyl, phosphino, seleno, and combinations thereof; and is also provided with

9. The compound of claim 1, wherein the ligand L _A Selected from the group consisting of L _Ai A group consisting of, wherein i is an integer from 1 to 108, and L _A1 To L _A108 Is defined as follows:

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10. the compound of claim 1, wherein the compound has a formula selected from the group consisting of: ir (L) _A ) ₃ 、Ir(L _A )(L _B ) ₂ And Ir (L) _A ) ₂ (L _B )。

11. The compound of claim 10, wherein L _B Each independently selected from the group consisting of:

/>

wherein:

t is selected from the group consisting of B, al, ga and In;

K ^1' selected from the group consisting of: single bond, O, S, NR _e 、PR _e 、BR _e 、CR _e R _f And SiR _e R _f ；

Y ¹ To Y ¹³ Independently selected from the group consisting of C and N;

y' is selected from the group consisting of: BR (BR) _e 、BR _e R _f 、NR _e 、PR _e 、P(O)R _e 、O、S、Se、C＝O、C＝S、C＝Se、C＝NR _e 、C＝CR _e R _f 、S＝O、SO ₂ 、CR _e R _f 、SiR _e R _f And GeR _e R _f ；

R _e And R is R _f Can be fused or joined to form a ring;

R _a1 、R _b1 、R _c1 、R _d1 、R _a 、R _b 、R _c 、R _d 、R _e and R is _f Each of which is independently hydrogen or a substituent selected from the group consisting of: deuterium, halo, alkyl, cycloalkyl, heteroalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, germyl, boron, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, thio, seleno, sulfinyl, sulfonyl, phosphino, and combinations thereof; and is also provided with

R _a1 、R _b1 、R _c1 、R _d1 、R _a 、R _b 、R _c And R is _d May be fused or joined to form a ring or to form a multidentate ligand.

12. The compound according to claim 9, wherein the compound has the formula Ir (L _Ai ) ₃ Ir (L) _Ai )(L _Bk ) ₂ Ir (L) _Ai ) ₂ (L _Cj-I ) Or Ir (L) _Ai ) ₂ (L _Cj-II ) Wherein k is an integer from 1 to 474; and j is an integer from 1 to 1416,

wherein:

wherein each L _Bk Has a structure as defined below:

/>

Each L _Cj-II With the basisWherein for L _Cj-I And L _Cj-II Each L of (3) _Cj ，R ²⁰¹ And R is ²⁰² Independently defined as follows:

/>

wherein R is ^D1 To R ^D246 The structure is as follows: />

/>

13. the compound of claim 1, wherein the compound is selected from the group consisting of:

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14. an organic light emitting device, comprising:

an anode;

a cathode; and

an organic layer disposed between the anode and the cathode,

wherein the organic layer comprises an organic compound having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (1), wherein:

x is 1, 2 or 3;

y is 0, 1 or 2;

z is 0, 1 or 2;

x+y+z＝3；

L _A having the formula IAnd L is of the structure of _B And L _C Is independently a bidentate ligand;

Z ¹ 、Z ² and Z ³ Each independently is C or N;

each R ^A And R is ^B Independently hydrogen or selected from the group consisting ofSubstituents of the group: deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boron, aralkyl, alkoxy, aryloxy, amino, silyl, germane, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, thio, sulfinyl, sulfonyl, phosphino, seleno, and combinations thereof;

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

an anode;

a cathode; and

an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a metal having the formula Ir (L _A ) _x (L _B ) _y (L _C ) _z A compound of the structure of (1), wherein:

x is 1, 2 or 3;

y is 0, 1 or 2;

z is 0, 1 or 2;

x+y+z＝3；

L _A having the formula IAnd L is of the structure of _B And L _C Is independently a bidentate ligand; />

Z ¹ 、Z ² and Z ³ Each independently is C or N;