Provided are compounds of formula Ir(L.sub.A).sub.m(L.sub.B).sub.n, where m and n are each independently 1 or 2; and m+n=3; where L.sub.A has a structure of Formula I

##STR00001##

and L.sub.B has a structure of Formula II

##STR00002##

that are useful as emitters in OLEDs. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.

An organic electroluminescence device includes: a first electrode; a hole transport region disposed on the first electrode; an emission layer disposed on the hole transport region; an electron transport region disposed on the emission layer; and a second electrode disposed on the electron transport region, wherein the emission layer includes an organometallic compound of Formula 1:

##STR00001##

wherein, in Formula 1, the variables are described herein.

An organometallic compound represented by Formula 1:

##STR00001##

wherein Ln.sub.1 is a ligand represented by Formula 1A, Ln.sub.2 is a ligand represented by Formula 1B, X.sub.1 is O, S, or Se, CY.sub.1 is a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, n1 is 1 or 2, n2 is 1, 2, or 3, and the remaining substituents are as defined in the present specification.

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

##STR00001##

is provided with variables as defined herein. Formulations, OLEDs, and consumer products including the compound are also disclosed.

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

##STR00001##

is provided. In Formula I, moiety A is a heterocyclic fused ring system comprising a 5-membered ring fused to a 6-membered ring; moiety B is an aromatic ring or fused ring system; each R.sup.A and R.sup.B is independently a hydrogen or a General Substituent; K is a direct bond, O, or S; at least one of R.sup.A and R.sup.B comprises a substituent R comprising a silyl group or a germyl group; ligand L.sub.A is coordinated to a metal M, which has an atomic mass of at least 40; and metal M may be coordinated to other ligands Formulations, OLEDs, and consumer products containing the same are also provided.

According to an aspect of the present disclosure, a compound having a metal planar tetradentate coordination configuration is disclosed. In the compounds, the metal M is Pt or Pd; the four coordinating atoms are Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 and are each selected from N, C, and O. The compound includes a substituent R, and atoms M, Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 are used to define a first plane that passes through the metal M and is positioned to have a minimum sum of shortest distances with Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4. At least one non-hydrogen atom in R falls within a distal circle of a cylinder extending perpendicular to the first plane, where the distal circle of the cylinder is a height h from the base circle and the height h ranges from 3.3 Å to 4.8 Å.

The disclosure pertains to an organic molecule for use in optoelectronic devices. The organic molecule has a structure of Formula I:

##STR00001## wherein X is selected from the group consisting of a direct bond, NR.sup.1, O, S, SiR.sup.1R.sup.2 and CR.sup.1R.sup.2; Y is selected from the group consisting of a direct bond, NR.sup.3, O, S, SiR.sup.3R.sup.4 and CR.sup.3R.sup.4; and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently selected from the group consisting of: hydrogen, deuterium, N(R.sup.5).sub.2, OR.sup.5, SR.sup.5, Si(R.sup.5).sub.3, B(OR.sup.5).sub.2, OSO.sub.2R.sup.5, CF.sub.3, CN, halogen, C.sub.1-C.sub.40-alkyl, C.sub.1-C.sub.40-alkoxy, C.sub.1-C.sub.40-thioalkoxy, C.sub.2-C.sub.40-alkenyl, C.sub.2-C.sub.40-alkynyl, C.sub.6-C.sub.60-aryl, and C.sub.3-C.sub.57-heteroaryl.

An organometallic compound, represented by Formula 1:

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

wherein, in Formula 1, 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 the substituents of Formulae 1A and 1B are as provided herein in the detailed description.

A composition including a first compound and a second compound, wherein the first compound is an organometallic compound represented by Formula 1, the second compound is an organometallic compound represented by Formula 2, the first compound and the second compound are different from each other, the first compound and the second compound are each not tris[2-phenylpyridine]iridium, and |λP(Ir1)-λP(Ir2)| is in a range of 0 nm to about 30 nm, and at least one of Expressions 1 to 4 presented in the specification is satisfied,

Ir(L.sub.11).sub.n11(L.sub.12).sub.n12(L.sub.13).sub.n13  Formula 1

Ir(L.sub.21).sub.n21(L.sub.22).sub.n22(L.sub.23).sub.n23  Formula 2

wherein L.sub.11 to L.sub.13, L.sub.21 to L.sub.23, n11 to n13, and n21 to n23 are as provided herein.

Provided are a light-emitting device and an electronic apparatus including the same. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode, wherein the first electrode is a reflective electrode, the emission layer includes i) a first emission layer, ii) a second emission layer, or a combination thereof, wherein when the first emission layer and the second emission layer are both present, then the second emission layer is located between the first emission layer and the second electrode, the first emission layer includes a first compound capable of emitting first light having a first spectrum, λP(1) is an emission peak wavelength (nm) of the first spectrum, the second emission layer includes a second compound capable of emitting second light having a second spectrum, λP(2) is an emission peak wavelength (nm) of the second spectrum, the emission layer may emit third light having a third spectrum, λP(3) is an emission peak wavelength (nm) of the third spectrum, λP(1) is less than λP(2), |λP(1)−λP(2)| is greater than 0 nm and less than or equal to 30 nm, and each of |λP(2)−λP(3)| and |λP(3)−λP(1)| is greater than or equal to 0 nm and less than or equal to 30 nm.