A novel compound is disclosed which includes a ligand L.sub.A of Formula II, ##STR00001##
wherein: ring B is independently a 5-membered or 6-membered carbocyclic or heterocyclic ring; X.sup.1 to X.sup.4 are each independently selected from the group consisting of C, N, and CR; at least one pair of adjacent X.sup.1 to X.sup.4 are each C and fused to Formula V ##STR00002##
where indicated by “”; X.sup.5 to X.sup.12 are each independently C or N; the maximum number of N within a ring is two; Z and Y are each independently selected from the group consisting of O, S, Se, NR′, CR′R″, SiR′R″, and GeR′R″; R.sup.B and R.sup.C each independently represents zero, mono, or up to a maximum allowed substitutions to its associated ring; each of R.sup.B, R.sup.C, R, R′, and R″ is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, boryl, and combinations thereof; and two substituents can be joined or fused to form a ring; the ligand L.sub.A is complexed to a metal M through the two indicated dash lines of each Formula; and the ligand L.sub.A can be joined with other ligands to form a tridentate, tetradentate, pentadentate, or hexadentate ligand.

An organometallic compound represented by Formula 1A:

##STR00001##

wherein, in Formula 1A, groups and variables are the same as described in the specification.

A compound having the formula Ir(L.sub.A).sub.n(L.sub.B).sub.3-n, having the structure ##STR00001##
of Formula I is provided. In the structure of Formula I, each of A.sup.1 through A.sup.8 is independently carbon or nitrogen; at least one of A.sup.1 through A.sup.8 is nitrogen; ring B is bonded to ring A through a C—C bond; the iridium is bonded to ring A through an Ir—C bond; X is O, S, or Se; each of R.sup.1 through R.sup.5 are independently selected from a variety of substituents, which may be linked for form a ring; n is an integer from 1 to 3; and at least one R.sup.2 adjacent to ring C is not hydrogen. Formulations and devices, such as OLEDs, that include the first compound are also provided.

A compound having the formula (L.sub.A).sub.mIr(L.sub.B).sub.3-m, where L.sub.A is

##STR00001##

and L.sub.B is

##STR00002##

is disclosed. In the formula (L.sub.A).sub.mIr(L.sub.B).sub.3-m, L.sub.A and L.sub.B are different; each of X.sup.1 to X.sup.5 is C—R.sub.F or nitrogen; X is selected from O, S, and Se; each R.sup.1, R.sup.2, R.sub.B, R.sub.D, and R.sub.F is hydrogen or a substituent; R.sup.3 is alkyl, cycloalkyl, or a combination thereof; and m is 1 or 2. OLEDs, consumer products, and formulations including the compound are also disclosed.

An organometallic compound represented by Formula 1:

##STR00001##

wherein, in Formula 1, groups and variables are the same as described in the specification.

The present invention relates to specific transition metal catalysts and their use in chemical reactions.

The present invention relates to specific transition metal catalysts and their use in chemical reactions.

The present invention relates to the preparation of a novel tetradentate platinum (II) complex and an application thereof, belonging to the field of OLED organic electroluminescent materials. The complex of the present invention has the following structural formula, and is used for a phosphorescent doping material having a photon emission effect in a light-emitting layer of an OLED luminescent device. The complex of the present invention has a high fluorescence quantum efficiency, a good heat stability and a low quenching constant, and can be used for the manufacture of a green light OLED device with a high luminous efficiency and low roll-off.

##STR00001##

The present invention relates to an iridium complex compound represented by the following formula (1):

##STR00001##

in the formula (1), Ir represents an iridium atom, R.sup.5 to R.sup.14, R.sup.21, and R.sup.22 each independently represent a hydrogen atom, D, F, Cl, Br, I, or a substituent group, the groups adjacent to each other may be further bonded to each other to form a ring, and any one of R.sup.12 and R.sup.13 is a substituent group represented by the formula (2).

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