Provided are organometallic compounds including a ligand L.sub.A of Formula I ##STR00001##

Provided are organometallic compounds comprising a first ligand L.sub.A comprising a multicyclic fused ring system wherein ligand L.sub.A is coordinated to a metal M; and wherein M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.

An iridium complex which has a phenylpyridine bidentate ligand containing a group represented by the following general formula (A):

##STR00001##

(In the general formula (A), X represents a cyano group or a halogenated alkyl group. L represents a single bond or a divalent linking group. R represents a substituent. n represents an integer of 0 to 4. * represents a binding site to a phenylpyridine bidentate ligand.)

An organometallic compound represented by Formula 1:

##STR00001##

wherein M.sub.1 is a transition metal, Ln.sub.1 is a ligand represented by Formula 1A, Ln.sub.2 is a ligand represented by Formula 1B, n1 is 1 or 2, and n2 is 1 or 2:

##STR00002##

##STR00003##

wherein ring CY.sub.3 is: a 5-membered N-containing heterocyclic group; or a 5-membered N-containing heterocyclic group condensed with a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, ring CY.sub.4 is: a 6-membered carbocyclic group; a 6-membered heterocyclic group; a 6-membered carbocyclic group condensed with a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group; or a 6-membered heterocyclic group condensed with a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, Y.sub.1 is O, S, Se, or C(R.sub.1)(R.sub.2), Y.sub.2 is O or S, and b30, b40, R.sub.1, R.sub.2, R.sub.11 to R.sub.14, R.sub.21 to R.sub.26, R.sub.30, and R.sub.40 are as defined herein.

Provided are organometallic compounds having a structure of

##STR00001##

Also provided are formulations that include these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.

The present invention relates to heteroleptic carbene complexes comprising at least two different carbene ligands, to a process for preparing the heteroleptic carbene complexes, to the use of the heteroleptic carbene complexes in organic light-emitting diodes, to organic light-emitting diodes comprising at least one inventive heteroleptic carbene complex, to a light-emitting layer comprising at least one inventive heteroleptic carbene complex, to organic light-emitting diodes comprising at least one inventive light-emitting layer, and to devices which comprise at least one inventive organic light-emitting diode.

Novel Iridium complexes having three different bidentate ligands useful for phosphorescent emitters in OLEDs are disclosed. At least one of the three different bidentate ligands is a carbene ligand.

Disclosed is an organometallic compound represented by a following Chemical Formula I, wherein the compound is a metal complex including a central coordination metal and a main ligand binding thereto, wherein the main ligand has a structure in which a fused ring is further introduced into 2-phenylquinoline. When the organometallic compound is used as dopant of a light-emitting layer of an organic electroluminescent device, rigidity is imparted to the organometallic compound molecule such that a full width at half maximum (FWHM) is narrow and thus color purity is improved. Further, a non-luminescent recombination process is reduced such that luminous efficiency and lifespan of the organic electroluminescent device are improved. Chemical Formula I is shown below:

##STR00001##

Provided is a compound including a first ligand L.sub.A of Formula I,

##STR00001##

In Formula I, moiety A is a monocyclic ring or a multicyclic fused ring system; one of X.sup.1, X.sup.2, and X.sup.3 is C and is connected to X.sup.4; one of X.sup.1, X.sup.2, and X.sup.3 is N and is coordinated to a metal M; and the remaining one of X.sup.1, X.sup.2, and X.sup.3 is CR or N; X.sup.4 is C or N; Y is a divalent linking group; each R, R′, R.sup.A, and R.sup.B is independently hydrogen or a General Substituent; each of K.sup.1 and K.sup.2 is independently direct bond, O, or S; and metal M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au. Formulations, OLEDs, and consumer products including the same are also provided.

The present invention relates to spiro compounds containing electron-conducting groups and to electronic devices, in particular organic electroluminescent devices, comprising these compounds.