The present invention relates to phosphorous host materials and an organic electroluminescent device comprising the same. By using the phosphorous host material of the present invention, an organic electroluminescent device having significantly improved operational lifespan can be produced.

The present application belongs to the technical field of organic materials and provides a nitrogen-containing compound, an electronic component, and an electronic device. The nitrogen-containing compound has a structure shown in Chemical formula 1:

##STR00001##

Provided are organometallic complexes including 5-membered heterocyclic rings. The compounds include a ligand L.sub.A having a structure of

##STR00001##

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

A condensed cyclic compound represented by Formula 1: ##STR00001## wherein, in Formula 1, A.sub.1, D.sub.1, and R.sub.11 to R.sub.14 are the same as described in the specification.

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

The present invention relates to compounds of the formulae (1) to (4), which are suitable for use in electronic devices, in particular organic electroluminescent devices, to intermediate compounds for the compounds or formulae (1) to (4) and to electronic devices, which comprise the compounds of formulae (1) to (4).

The present invention relates to phosphorous host materials and an organic electroluminescent device comprising the same. By using the phosphorous host material of the present invention, an organic electroluminescent device having significantly improved operational lifespan can be produced.

An OLED including an anode, a cathode, and an organic layer between the anode and the cathode, where the organic layer includes a compound having the formula [L.sub.A].sub.3-nIr[L.sub.B].sub.n is disclosed. In the formula, L.sub.A is ##STR00001##

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having one of the following structures:

##STR00001## ##STR00002##

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.