A light emitting element that includes a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode is provided. The emission layer includes an organometallic compound represented by Formula 1. The light emitting element has a reduced driving voltage, emits light having an increased color purity, and exhibits a high efficiency and a long lifespan.

##STR00001##

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having one of the following structures:

##STR00001## ##STR00002##

An organometallic compound represented by Formula 1:

##STR00001## wherein, in Formula 1, M is a transition metal, X.sub.1 to X.sub.4 each independently C or N, X.sub.5 is O, S, N(R′), C(R′)(R″), or C(═O), wherein a bond between X.sub.5 and M is a covalent bond, and one of a bond between X.sub.2 and M, a bond between X.sub.3 and M, and a bond between X.sub.4 and M is a covalent bond, and the other two are each a coordinate bond, ring CY.sub.1 to ring CY.sub.4 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, and wherein T.sub.1 to T.sub.4, n1 to n4, Z.sub.1 to Z.sub.4, d1 to d4, L.sub.1 to L.sub.4, R.sub.1 to R.sub.4, a1 to a4, b1 to b4, and c1 to c4 are as provided herein.

An organic light-emitting device includes an organometallic compound represented by M.sub.1(L.sub.1).sub.n1(L.sub.2).sub.n2, wherein L.sub.1 is a ligand represented by Formula 1-1: ##STR00001##
In Formula 1-1, *1 to *4 indicate a binding site to M.sub.1, and Z.sub.11 and Z.sub.12 are respectively boron (B) and nitrogen (N), or N and B. When M.sub.1 binds to an α-position of the B or N atom, metal-ligand charge transfer in the complex may be improved. An OLED including the organometallic compound may have a long lifespan and improved luminescent efficiency and colorimetric purity.

An organic light emitting diode having a substrate, a first electrode, a hole transporting layer proximate the first electrode, a second electrode, an electron transporting layer proximate the second electrode, and an emissive layer between the hole transporting layer and the electron transporting layer. The emissive layer includes a square planar tetradentate platinum or palladium complex, and excimers formed by two or more of the complexes are aligned such that emitting dipoles of the excimers are substantially parallel to a surface of the substrate.

The invention relates to a noble metal complex comprising diolefin and C6-C18 monocarboxylate ligands of the type [LPd[O(CO)R1]X].sub.n, [LRh[O(CO)R1]].sub.m or [LIr[O(CO)R1]].sub.m, in which L represents a compound acting as a diolefin ligand, wherein X is selected from bromide, chloride, iodide and —O(CO)R2, wherein —O(CO)R1 and —O(CO)R2 represent identical or different non-aromatic C6-C18 monocarboxylic acid residues, in each case with the exception of a phenylacetic acid residue, and wherein n is an integer ≥1 and m is an integer ≥2.

An organometallic complex including a ligand L.sub.A having a structure represented by one of the following formula

##STR00001##

and coordinated to Ir is disclosed.

This disclosure relates to N-substituted Pd(II)-N-heterocyclic carbene-pyridine complexes, methods of preparing the complexes, and methods of using the complexes in Sonogashira coupling reactions.

This disclosure relates to bridged bis(N-heterocyclic carbene)palladium(II) complexes, methods of preparing the complexes, and methods of using the complexes in Suzuki-Miyaura coupling reactions.

Provided are compounds compound comprising a first ligand L.sub.A of Formula I:

##STR00001##

wherein R.sup.1 and R.sup.2 are each independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein L.sub.A is coordinated to a metal M through the indicated dashed lines; wherein M may be coordinated to other ligands; wherein L.sub.A may be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand; and wherein any two substituents may be joined or fused to form a ring. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.