An object is to provide a novel organometallic complex. Another object is to provide an organometallic complex that can exhibit yellow to blue phosphorescence. A platinum complex with a tetracoordinate ligand including a phenothiazine skeleton or a phenoxazine skeleton is provided. In the ligand, nitrogen at the 10-position and carbon at the 2-position of the phenothiazine skeleton or the phenoxazine skeleton have a pyridyl group and a phenoxy group, respectively. A five-membered heteroaromatic residue is present at the 3-position of the phenoxy group. The five-membered heteroaromatic residue has two or three nitrogen atoms in its skeleton. Carbon at the 1-position of the phenothiazine skeleton or the phenoxazine skeleton and carbon at the 2-position of the phenoxy group are bonded to platinum, and nitrogen of the pyridyl group and nitrogen or carbene carbon of the five-membered heteroaromatic residue are coordinated to platinum.

An organic molecule is disclosed having: a first chemical unit comprising or consisting of a structure according to formula I

##STR00001##

and two second chemical moieties, each at each occurrence independently from another comprising or consisting of a structure of formula II,

##STR00002##

wherein the first chemical moiety is linked to each of the two second chemical moieties via a single bond.

A method for synthesizing an organic metal complex having a substituent capable of coordinating to a central metal ion includes replacing substituents RX and RX in an organic metal complex having a structure represented by general formula (2) with substituents RB and RB in an organic metal complex having a structure represented by general formula (1), respectively: ##STR00001##

A method for producing a halogen-crosslinked iridium dimer with increased purity that is used as a precursor in production of a cyclometalated iridium complex useful as a phosphorescent material for organic electroluminescent devices, organic electrochemiluminescent devices, luminescent sensors, photosensitizing pigments, photocatalysts, luminescent probes, various light sources, and the like. The halogen-crosslinked iridium dimer is represented by the following formula: ##STR00001##
In this formula, each X represents a halogen atom, each CyA represents an optionally substituted five- or six-membered cyclic ring containing nitrogen atoms, and is linked to iridium via the nitrogen atoms, and each CyB represents an optionally substituted five- or six-membered ring containing carbon atoms, and is linked to iridium via the carbon atoms. CyA and CyB can be linked together to form an optionally substituted ring.

A compound having the formula [L.sub.A].sub.3-nIr[L.sub.B].sub.n is disclosed. In the formula, L.sub.A is ##STR00001##
and L.sub.B is ##STR00002##
Formula I.

A heteroaromatic compound which can be used as the fluorescent guest material in the light emitting layer of the organic electroluminescence device is disclosed. The organic electroluminescence device employing the heteroaromatic compound of the present invention can operate under reduced driving voltage, increase current efficiency, and prolong half-life time.

An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer includes a first compound represented by Formula 1 and a second compound represented by Formula 501. The organic light-emitting device including the first compound and the second compound may have low driving voltage, high efficiency, and high luminance. ##STR00001##

Compounds comprising phosphorescent metal complexes comprising cyclometallated ligands having a structure of

##STR00001##

In the vgs3, each of the E.sup.1 atoms is selected from C and N, except that E.sup.1g is selected from C, N, and S. The E.sup.1 atoms collectively comprise an 18 pi-electron system, provided that E.sup.1a and E.sup.1p are different. The R.sup.1 substituents are each, independently, H, hydrocarbyl, heteroatom substituted hydrocarbyl, cyano, fluoro, OR.sup.2a, SR.sup.2a, NR.sup.2aR.sup.2b, BR.sup.2aR.sup.2b, or SiR.sup.2aR.sup.2bR.sup.2c, where the R.sup.2 substituents are each, independently, hydrocarbyl or heteroatom substituted hydrocarbyl. Any of the R.sup.1 or R.sup.2 substituents can be linked to form a saturated or unsaturated, aromatic or non-aromatic ring, provided that the R.sup.1 substituents are not present when the corresponding one of E atoms is N or S. Organic light emitting diode devices comprising these compounds are also described.

A compound having a metal coordination complex structure, where the compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature is disclosed. The compound has a first ligand coordinated to a metal. The free-state of the first ligand has a first triplet energy T1 of E.sub.L at 77K, while the compound has a first triplet energy T1 of E at 77K, and the difference in energy (E) between E and E.sub.L is 250 meV. The compound has a triplet emission spectrum with a FWHM value of no more than 45 nm. Organic light emitting devices, consumer products, and formulations containing the compounds are also disclosed.

Disclosed herein are combinations of a dopant compound and a host compound. The dopant being an Iridium complex and the host being a carbazole derivative. Also made known are electroluminescent devices comprising the same.