Specific polycyclic compounds of the general formula (I) and a process for its preparation, an electronic device comprising at least one of these compounds, an emitting layer, preferably present in an electronic device, comprising at least one compound of general formula (I) and the use of compounds according to general formula (I) in an electronic device as a host material, a charge transporting material, charge and/or exciton blocking material, preferably as a host material or an electron transporting material. ##STR00001##

The present specification relates to an organic light emitting device comprising a first electrode, a second electrode, and an organic material layer comprising one or more layers provided between the first electrode and the second electrode, wherein the one or more layers of the organic material layer comprise a heterocyclic compound represented by Chemical Formula 1 and a heterocyclic compound represented by Chemical Formula 2, a composition for the organic material layer of the organic light emitting device, and a method for manufacturing the organic light emitting device.

A heterocyclic compound represented by Formula 1: ##STR00001## wherein, in Formula 1, groups and variables are the same as described in the specification.

The present disclosure relates to an organic electroluminescent device comprising an anode, a cathode, and an organic layer between the anode and the cathode, wherein the organic layer comprises one or more light-emitting layers; and at least one light-emitting layer comprises one or more dopant compounds and two or more host compounds. The organic electroluminescent device of the present disclosure has low driving voltage, high color purity, high luminous efficiency, and a long lifespan.

Tridentate platinum, palladium, and gold complexes of Formulas A-I and A-II and tridentate iridium and rhodium compounds of Formulas B-I, B-II, and B-III suitable for delayed fluorescent and phosphorescent or phosphorescent emitters in display and lighting applications.

##STR00001##

An organic electroluminescent device is disclosed. The organic electroluminescent device achieves low driving voltage and high luminous efficiency as well as long lifespan by including an exciton confinement layer (ECL), in which a predetermined physical property is adjusted, in an area of an electron transporting area, including at least two layers, that is adjacent to an emissive layer.

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

The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by formula 1, and a second host material comprising a compound represented by formula 2, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds of the present disclosure as host materials, it is possible to provide an organic electroluminescent device having higher luminous efficiency and/or longer lifetime properties as compared with a conventional organic electroluminescent device.

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device comprising the same.

The present invention relates to a compound and an organic light-emitting device containing the compound. The compound has a structure as shown in Formula (1), where X is selected from the group consisting of: O, S, Se, CR.sub.3R.sub.4, SiR.sub.5R.sub.6, GeR.sub.7R.sub.8 and BR.sub.9. The compound can be used in organic light-emitting devices, particularly as a host material or a hole blocking layer material in an emitting layer of a device or both as the host material and hole blocking layer material simultaneously. Moreover, the compound can provide a higher luminous efficiency for a device, especially has the advantages such as a longer service life of a device, and has the possibility to be applied to the AMOLED industry.

##STR00001##