Provided is an organometallic compound including a first ligand L.sub.A selected from

##STR00001## ##STR00002##

In ligand L.sub.A, each of Y.sup.1 to Y.sup.10 is carbon or nitrogen; moiety B is a monocyclic or polycyclic fused ring structure including 5-membered and/or 6-membered rings; any two R.sub.A and R.sub.B can be fused or joined to form a ring; X is selected from O, S, Se, or NR; each R.sub.A and R.sub.B is independently hydrogen or a substituent selected from the general substituent defined herein; at least one R, R.sub.A, or R.sub.B is deuterium or a linking group between L.sub.A and another ligand that includes a deuterium substituted aromatic ring; and L.sub.A is coordinated to a metal M, selected from Os, Pd, Pt, Ir, Cu, Ag, or Au; and the compound is capable of emitting light with a peak maximum wavelength (λ.sub.max)≥700 nm at room temperature.

Metal complexes with cyclic ligands having Formula (I), ##STR00001##
are disclosed. Ligands with cyclic structure are believed to be beneficial to the rigidity and stability of the metal complexes, which is desirable for improving OLED device performance.

A compound comprising a first ligand L.sub.A of Formula I,

##STR00001##

is provided. In Formula I, Ring A is a 5-membered or 6-membered ring, and moiety G has a structure of

##STR00002##

where
the dashed line marked with * is coordinated to Ir; the dashed line marked with # is bonded to Ring A; Y is selected from the group consisting of BR, BRR′, NR, PR, O, S, Se, C═O, C═S, C═Se, C═NR, C═CRR′, S═O, SO.sub.2, CR, CRR′, SiRR′, and GeRR′. Formulations, OLEDs, and consumer products containing the compound are also provided.

An organometallic compound represented by Formula 1:

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

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,

##STR00001##

wherein ring CY.sub.1 and ring CY.sub.2 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, ring CY.sub.41 is a phenyl group, ring CY.sub.42 is a 5-membered aromatic heterocyclic group, and the other substituents are as described herein.

A compound comprising a ligand L.sub.A, having a structure of Formula I,

##STR00001##

is provided. In Formula I, A.sup.1 to A.sup.8 are each independently CR or N; at least two adjacent ones of A.sup.1 to A.sup.8 are CR and the Rs are joined together to form a six-membered ring fused to ring A or ring C; X is O, S, or Se; each R and R.sup.B is independently hydrogen or a substituent; any adjacent substituents are optionally joined or fused into a ring; the ligand L.sub.A is coordinated to a metal M; the metal M is bonded to ring A through a M-C bond; the metal M can be coordinated to other ligands; and the ligand L.sub.A is optionally linked with other ligands. Formulations, OLEDs, and consumer products containing such compounds are also disclosed.

A compound having the formula Ir(L.sub.A).sub.n(L.sub.B).sub.3−n, having the structure ##STR00001##
Formula I, is disclosed. In Formula I, each of Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 is CR.sup.2; X is O, S, or Se; n is an integer from 1 to 3; R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 each independently represent mono- to a maximum possible number of substitutions, or no substitution; R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are each independently selected from a variety of substituents; any two substitutions in R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are optionally joined to form a ring; at least one pair of substitutions in R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are joined together to form a bridge structure comprising a backbone structure that forms a fused first ring, which can be further substituted; and the backbone structure is saturated. Organic light emitting devices and consumer products containing the compounds are also disclosed.

A compound comprising a first ligand L.sub.A of Formula I, ##STR00001##
is disclosed. In the structure of Formula I, ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring; Z.sup.1-Z.sup.4 are each independently C or N; at least two consecutive Z.sup.1-Z.sup.4 are C, and are fused to a structure of Formula II ##STR00002##
or Formula III ##STR00003##
Y.sup.1; Y.sup.1 and Y.sup.2 are each independently O, S, Se, CRR′, SiRR′, or GeRR′; each R.sup.A, R.sup.B, R.sup.C, R, and R′ is a hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by the dashed lines in Formula I to form a five-membered chelate ring, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

A composition is disclosed that includes a first compound capable of functioning as a host in an emissive layer of an OLED at room temperature; and a second compound that includes a ligand L.sub.A of Formula III ##STR00001##
where ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring; where R represents two adjacent substituents that are joined together to form a ring that is fused to ring B, and R has a structure of Formula IV ##STR00002##
or Formula V ##STR00003##
disclosed herein.

Provided are an organometallic compound represented by Formula 1 and an organic light-emitting device including the same. The organic light-emitting device includes a first electrode; a second electrode facing the first electrode; an organic layer between the first electrode and the second electrode and including an emission layer; and at least one organometallic compound represented by Formula 1.

An organometallic compound represented by Formula 1:

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

wherein, M is a transition metal, L.sub.1 and L.sub.2 are ligands as provided herein, n1 and n2 are each independently 1 or 2, the sum of n1 and n2 is 2 or 3, and L.sub.1 is different from L.sub.2.