Specific polycyclic compounds, a material for an organic electroluminescence device comprising said specific polycyclic compound, an organic electroluminescence device comprising said specific polycyclic compound, an electronic equipment comprising said organic electroluminescence device, a process for preparing said polycyclic compounds, and the use of said polycyclic compounds in an organic electroluminescence. (Formula I) (I)

##STR00001##

Specific polycyclic compounds, a material for an organic electroluminescence device comprising said specific polycyclic compound, an organic electroluminescence device comprising said specific polycyclic compound, an electronic equipment comprising said organic electroluminescence device, a process for preparing said polycyclic compounds, and the use of said polycyclic compounds in an organic electroluminescence. (Formula I) (I)

##STR00001##

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 composition of materials including a first compound having a structure according to Formula I

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A composition of materials including a first compound having a structure according to Formula I

##STR00001##

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

An organic electroluminescence device includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region, wherein the hole transport region includes a polycyclic compound represented by Formula 5 or Formula 6, thereby showing high emission efficiency.

An organic electroluminescence device includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region, wherein the hole transport region includes a polycyclic compound represented by Formula 5 or Formula 6, thereby showing high emission efficiency.

The present disclosure relates to a plurality of host materials comprising a first host material having a compound represented by formula 1, and a second host material having 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 long lifetime properties while having an equivalent or improved level of power efficiency compared to conventional organic electroluminescent devices.