Provided is a heterocyclic compound of Chemical Formula 1:

##STR00001## wherein: X.sub.1 is O or S; L.sub.1 is a single bond or an unsubstituted phenylene; L.sub.2 is a single bond, or a substituted or unsubstituted: phenylene, naphthylene, or biphenylenyl; Y.sub.1 to Y.sub.3 are each independently N or CR.sub.3, where at least one is N; Ar.sub.1a and Ar.sub.1b are each independently a substituted or unsubstituted: C.sub.6-60 aryl or C.sub.1-60 heteroaryl containing 1 to 3 heteroatoms selected from N, O and S; R.sub.1 and R.sub.2 are each independently hydrogen, deuterium, cyano, or a substituted or unsubstituted C.sub.1-10 alkyl; each R.sub.3 is independently hydrogen, deuterium, halogen, cyano, nitro, amino, or a substituted or unsubstituted: C.sub.1-60 alkyl, C.sub.1-60 haloalkyl, C.sub.1-60 alkoxy, a C.sub.1-60 haloalkoxy, C.sub.3-60 cycloalkyl, C.sub.2-60 alkenyl, C.sub.6-60 aryl, C.sub.6-60 aryloxy, or a C.sub.1-60 heteroaryl containing at least one heteroatom selected from N, O and S; and an organic light emitting device comprising the same.

Provided is a heterocyclic compound of Chemical Formula 1:

##STR00001## wherein: X.sub.1 is O or S; L.sub.1 is a single bond or an unsubstituted phenylene; L.sub.2 is a single bond, or a substituted or unsubstituted: phenylene, naphthylene, or biphenylenyl; Y.sub.1 to Y.sub.3 are each independently N or CR.sub.3, where at least one is N; Ar.sub.1a and Ar.sub.1b are each independently a substituted or unsubstituted: C.sub.6-60 aryl or C.sub.1-60 heteroaryl containing 1 to 3 heteroatoms selected from N, O and S; R.sub.1 and R.sub.2 are each independently hydrogen, deuterium, cyano, or a substituted or unsubstituted C.sub.1-10 alkyl; each R.sub.3 is independently hydrogen, deuterium, halogen, cyano, nitro, amino, or a substituted or unsubstituted: C.sub.1-60 alkyl, C.sub.1-60 haloalkyl, C.sub.1-60 alkoxy, a C.sub.1-60 haloalkoxy, C.sub.3-60 cycloalkyl, C.sub.2-60 alkenyl, C.sub.6-60 aryl, C.sub.6-60 aryloxy, or a C.sub.1-60 heteroaryl containing at least one heteroatom selected from N, O and S; and an organic light emitting device comprising the same.

A mixture of carbazole and triazine derivatives that can be thermally evaporated from one crucible to fabricate thin films for electroluminescent devices is disclosed.

A mixture of carbazole and triazine derivatives that can be thermally evaporated from one crucible to fabricate thin films for electroluminescent devices is disclosed.

Disclosed is an organic light emitting device including a first electrode, a second electrode opposite to the first electrode, and at least one organic layer interposed between the first and second electrodes. The organic layer includes first and second compounds represented by Formulae A and B, respectively: ##STR00001## The organic light emitting device exhibits low driving voltage, high efficiency, and long life. Due to these advantages, the organic light emitting device is useful in a variety of industrial applications, including displays and lighting systems.

Disclosed is an organic light emitting device including a first electrode, a second electrode opposite to the first electrode, and at least one organic layer interposed between the first and second electrodes. The organic layer includes first and second compounds represented by Formulae A and B, respectively: ##STR00001## The organic light emitting device exhibits low driving voltage, high efficiency, and long life. Due to these advantages, the organic light emitting device is useful in a variety of industrial applications, including displays and lighting systems.

The present invention addresses the problem of providing a polycyclic aromatic compound which has improved solubility in solvents, film formability, wet coatability and in-plane orientation. The above-described problem is solved by a composition for forming a light emitting layer, which contains, as a first component, at least one compound selected from the group consisting of compounds represented by general formula (A-1) and compounds represented by general formula (A-2), as a second component, at least one compound that has a triplet energy (E.sub.T) of 1.8-3.0 eV, and as a third component, at least one organic solvent. ##STR00001## In the formulae, R represents a hydrogen atom, an aryl group, a heteroaryl group, a diarylamino group, a diheteroarylamino group or an aryl heteroarylamino group.

The present invention addresses the problem of providing a polycyclic aromatic compound which has improved solubility in solvents, film formability, wet coatability and in-plane orientation. The above-described problem is solved by a composition for forming a light emitting layer, which contains, as a first component, at least one compound selected from the group consisting of compounds represented by general formula (A-1) and compounds represented by general formula (A-2), as a second component, at least one compound that has a triplet energy (E.sub.T) of 1.8-3.0 eV, and as a third component, at least one organic solvent. ##STR00001## In the formulae, R represents a hydrogen atom, an aryl group, a heteroaryl group, a diarylamino group, a diheteroarylamino group or an aryl heteroarylamino group.

A dielectric material, to a device comprising the dielectric material and to use of the dielectric material in the fabrication of a device. One dielectric material may comprise a halogen-based elastomer mixed with a halogen based surfactant and exhibiting electro-mechanical self-healing properties and/or an increased dielectric constant compared to the halogen-based elastomer. Another dielectric material may comprise a halogen-based polymer mixed with a halogen based surfactant and exhibiting an increased dielectric constant compared to the halogen-based polymer.

A dielectric material, to a device comprising the dielectric material and to use of the dielectric material in the fabrication of a device. One dielectric material may comprise a halogen-based elastomer mixed with a halogen based surfactant and exhibiting electro-mechanical self-healing properties and/or an increased dielectric constant compared to the halogen-based elastomer. Another dielectric material may comprise a halogen-based polymer mixed with a halogen based surfactant and exhibiting an increased dielectric constant compared to the halogen-based polymer.