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## ##STR00003##

This invention discloses phosphorescent metal complexes with novel ligand structures of Formula I: ##STR00001## wherein X, Z.sup.1, Z.sup.2, Z.sup.3, rings A and C, R.sup.A, R.sup.B, R.sup.C, and ligand L.sub.A are as described herein. These complexes are used as emitters in phosphorescent OLEDs.

An organic molecule is disclosed comprising: a first chemical moiety with a structure of formula I, ##STR00001##
and two second chemical moieties, each at each occurrence independently from another, with 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 phosphorescent emitter or delayed fluorescent and phosphorescent emitters represented by Formula I or Formula II, where M is platinum or palladium.

##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.

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.

A fused ring compound and applications thereof in organic electronic components, particularly in organic electroluminescent diodes; an organic electronic component comprising the fused ring compound, and applications thereof in organic electroluminescent diodes and in display and lighting technologies; and a formulation comprising the fused ring compound, and applications thereof in the preparation of organic electronic components. By optimizing the component structure, good component performance can be achieved, and especially, a high-performance OLED component can be implemented, which provide good material and preparation technology choices for full-color display and lighting applications.

Ir phenyl parazolepyrazole complexes substituted with one or more strong electron withdrawing groups such as cyano groups resulted in enhancing the metal to ligand charge transfer (MLCT) which in turn resulted in enhanced emission efficiency and red shifted emission.

An organometallic compound represented by Formula 1:

M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1

wherein M, L.sub.1, L.sub.2, n1, and n2 are the same as described in the specification.

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.