The present invention relates to an organic electroluminescent device comprising a mixture comprising an electron-transporting host material and a hole-transporting host material, and to a formulation comprising a mixture of the host materials and to a mixture comprising the host materials. The electron-transporting host material corresponds to a compound of the formula (1) from the class of the fused carbazole derivatives containing an asymmetrically substituted pyrimidine or triazine unit.

The present invention relates to a compound suitable as ligand for binding to the surface of a semiconductor nanoparticle, said compound comprising an anchor group, a linker group and an organic functional group; a semiconductor nanoparticle have said ligand attached to the outermost particle surface; a composition, a formulation and a process for the preparation of said semiconductor nanoparticle; and an electronic device.

Disclosed are an organic optoelectronic device includes an anode and a cathode facing each other and an organic layer disposed between the anode and the cathode, wherein the organic layer includes at least one of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and the light emitting layer includes a first host, a second host, and a phosphorescent dopant represented by Chemical Formula 4, and a display device including the same.

A thin film including a combination of a donor compound and an acceptor compound, and a phosphorescent dopant, wherein the donor compound and the acceptor compound form an exciplex having characteristics 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.

Provided are an organic electroluminescent material and device thereof. The organic electroluminescent material is a metal complex comprising a ligand L.sub.a having a structure of Formula 1. These novel metal complexes are applied in organic electroluminescent devices, and are capable of providing better device performance such as improved device efficiency and an improved device lifetime, especially a greatly improved device lifetime, and can significantly improve the overall device performance. Further provided are an organic electroluminescent device comprising the metal complex and a compound composition comprising the metal complex.

A compound including a first ligand L.sub.A having the structure of Formula I, ##STR00001##
is disclosed. In Formula I, rings A and B are each a 6-membered rings; Z.sup.1 and Z.sup.2 are each carbon or nitrogen; each R.sup.A and R.sup.B is independently hydrogen or a variety of substituents; any two substituents are optionally joined or fused into a ring; at least one R.sup.A or R.sup.B comprises an aromatic group substituted by a bridge structure, and this R.sup.A or R.sup.B joins with an adjacent substituent and fuses to ring A or B; the bridge structure comprises a backbone structure that forms a fused first ring; the backbone structure is saturated, comprises at least one heteroatom, and is optionally further substituted; and the ligand L.sub.A is coordinated to a metal M that can be coordinated to other ligands.

The present disclosure is directed to cyclometalated metal compounds containing novel ligands having unique fused rings. The inventive compounds are expected to exhibit unique photophysical and electronic properties and are useful in an organic electroluminescence device to improve the performance.

A compound having a formula M(L.sub.A)(L.sub.B)(L.sub.C) is described. In formula M(L.sub.A)(L.sub.B)(L.sub.C), ligands L.sub.A and L.sub.B are each a mono-anionic bidentate ligand coordinated to metal M forming a 5-member cyclometalated ring and ligands L.sub.A and L.sub.B are covalently linked by a linking group. There is at least one loop of M-L.sub.A-linking group-L.sub.B-M having only arylene or heteroarylene groups in the loop other than M. In the compound, each ring in the linking group is part of a backbone of the loop; and either (i) the loop comprises a specific DBX moiety and the linking group comprises two or more arylene or heteroarylene groups, or (ii) the linking group comprises three or more arylene or heteroarylene groups. Formulations, OLEDs, and consumer product containing the compound are also disclosed.

A compound having a formula M(L.sub.A)(L.sub.B)(L.sub.C) is disclosed. Each of ligands L.sub.A and L.sub.B are mono-anionic bidentate ligands coordinated to metal M forming a 5-member cyclometalated ring. Ligands L.sub.A and L.sub.B are covalently linked by a first linking group, where there is at least one loop of M-L.sub.A-first linking group-L.sub.B-M having only carbocyclic or heterocyclic groups in the loop other than M. Wherein the first linking group includes multiple aliphatic or aromatic rings that are separated by at least one single bond, where each ring in the first linking group is part of the backbone of the loop. Devices, such as organic light emitting diodes, including the compounds are also disclosed.