An organometallic compound represented by Formula 1:

M(L.sub.1).sub.n1(L.sub.2).sub.n2Formula 1 wherein, Formula 1, M is a transition metal, L.sub.1 is a ligand represented by Formula 2 as provided herein, L.sub.2 is a ligand represented by Formula 3 as provided herein, and n1 and n2 are each independently 1 or 2.

Disclosed are a heterocyclic compound of Chemical Formula 1, an organic light emitting device including the same and a composition for an organic material layer of an organic light emitting device.

Disclosed is a class of dendrimers containing cyclometalated tridentate platinum(II) compounds with one monoanionic auxiliary ligand, both coordinated to a platinum (II) metal center and having the chemical structure shown in generic formula (I), wherein at least one of R.sub.1, R.sub.2 and R.sub.3 being a dendrimeric moiety of general formula (II), each being optionally substituted. ##STR00001##

Provided are organometallic compounds comprising a central metal atom and a ligand comprising at least four rings which are fused together, wherein at least one ring is a 6-membered aromatic ring. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.

The present invention relates to diazadibenzofuran derivatives and diazadibenzothiophene derivatives and to electronic devices containing these compounds, in particular organic electroluminescent devices containing these compounds in the form of matrix materials, optionally in combination with a further matrix material and suitable phosphorescent emitters, and suitable mixtures and formulations of said compounds.

An organometallic compound represented by Formula 1:

##STR00001## wherein, M is a transition metal; X.sub.1 is a chemical bond, O, S, N(R), P(R), B(R), C(R)(R), or Si(R)(R); X.sub.2 to X.sub.4 are each independently C or N; a bond between X.sub.1 or Y.sub.1 and M is a covalent bond; one of a bond between X.sub.2 and M, X.sub.3 and M, and X.sub.4 and M is covalent and the other two are coordinate; Y.sub.1 and Y.sub.3-Y.sub.5 are each independently C or N; ring CY.sub.1 to ring CY.sub.4 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, and at least one of ring CY.sub.1 to ring CY.sub.4 is independently a condensed cyclic group wherein two or more rings are condensed with each other; and T.sub.1, X.sub.51, L.sub.1 to L.sub.4; R.sub.1 to R.sub.4, a1 to a4, b1 to b4, and c1 to c4 are as described herein.

Provided are organometallic compounds comprising a central metal atom which is coordinated by an at least two-dentate ligand comprising at least two rings A and B which are connected by a direct bond as well as a further linking group so that a 7-10 membered ring to which rings A and B are fused is formed. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) as well as related consumer products that utilize these organometallic compounds.

The present invention describes fluorene derivatives substituted by electron-transporting groups, especially for use as hole blocking materials, electron injection materials and/or electron transport materials in electronic devices. The invention further relates to a process for preparing the compounds of the invention and to electronic devices comprising these.