Provided are a condensed cyclic compound having the following structure:

##STR00001##

wherein ring D.sub.1 and ring D.sub.2 are each independently a C.sub.6-C.sub.20 aromatic ring, and an organic light-emitting device including the same.

Provided are a condensed cyclic compound having the following structure:

##STR00001##

wherein ring D.sub.1 and ring D.sub.2 are each independently a C.sub.6-C.sub.20 aromatic ring, and an organic light-emitting device including the same.

The present application provides a dioxin derivative, a preparation method thereof, an electron transport layer, an OLED device and a display panel. The dioxin derivative has a formula of ##STR00001##
where X is O, S or NR; L represents a direct bond, or L is a substituted or unsubstituted C.sub.6-C.sub.60 arylene, or L is a C.sub.2-C.sub.60 heteroaryl including a first heteroatom; A has a formula of ##STR00002##
Ar1 and Ar2 independently are substituted or unsubstituted aryl, phenyl, biphenyl, or heterocyclyl comprising a second heteroatom, B is O, S or Se, X1, X2 and X3 independently are C or N, and at least one of X1, X2 or X3 is N, R4 and R5 independently are C.sub.5-C.sub.30 aromatic or heteroaromatic group ring.

The present application provides a dioxin derivative, a preparation method thereof, an electron transport layer, an OLED device and a display panel. The dioxin derivative has a formula of ##STR00001##
where X is O, S or NR; L represents a direct bond, or L is a substituted or unsubstituted C.sub.6-C.sub.60 arylene, or L is a C.sub.2-C.sub.60 heteroaryl including a first heteroatom; A has a formula of ##STR00002##
Ar1 and Ar2 independently are substituted or unsubstituted aryl, phenyl, biphenyl, or heterocyclyl comprising a second heteroatom, B is O, S or Se, X1, X2 and X3 independently are C or N, and at least one of X1, X2 or X3 is N, R4 and R5 independently are C.sub.5-C.sub.30 aromatic or heteroaromatic group ring.

The present disclosure relates to a novel organic compound and an organic electroluminescent device comprising the same, and the organic compound of the present disclosure may be used for an organic material layer of the organic electroluminescent device, thereby improving the light emitting efficiency, driving voltage, lifetime, and the like of the organic electroluminescent device.

The present disclosure provides a condensed-cyclic compound represented by Formula 1, in which one selected from R.sub.1 to R.sub.8 is a monoamine represented by Formula 2:

##STR00001##

The condensed-cyclic compound represented by Formula 1 may act as a hole transport material having a suitable energy level and band-gap. Further, the condensed-cyclic compound represented by Formula 1 has a fused core, and accordingly may have a high glass transition temperature (Tg), high melting point, and improved resistance to high temperatures. Therefore an organic light-emitting device including the condensed-cyclic compound represented by Formula 1 may retain high durability during storing and/or driving.

Provided are a condensed cyclic compound and an organic light-emitting device including the same. The material is represented by the formula A.sub.2-(A.sub.1).sub.n1, wherein A.sub.2 may be selected from groups represented by Formula 2, A.sub.1 may be selected from groups represented by Formulae 2-1 to 2-4, and n.sub.1 may be an integer selected from 1 to 5:

##STR00001##

Organic light-emitting devices manufactured using this material were found to have lower driving voltages, higher brightness values, higher efficiencies, and longer half-lifespans.

Provided are a condensed cyclic compound and an organic light-emitting device including the same. The material is represented by the formula A.sub.2-(A.sub.1).sub.n1, wherein A.sub.2 may be selected from groups represented by Formula 2, A.sub.1 may be selected from groups represented by Formulae 2-1 to 2-4, and n.sub.1 may be an integer selected from 1 to 5:

##STR00001##

Organic light-emitting devices manufactured using this material were found to have lower driving voltages, higher brightness values, higher efficiencies, and longer half-lifespans.

An organic light-emitting device that is highly efficient and has excellent driving durability characteristics. The present disclosure provides an organic light-emitting device including a substrate, a first electrode, a light-emitting layer, and a second electrode. The light-emitting layer contains a first organic compound, a second organic compound, and a third organic compound. A freely rotatable single bond in each of the first to third organic compounds is a carbon-carbon bond. At least one carbon of the freely rotatable carbon-carbon bond in the second organic compound is an sp.sup.2 carbon atom. Letting the HOMO energy level of the first organic compound be HOMO1, letting the LUMO energy level of the second organic compound be LUMO2, and letting the HOMO and LUMO energy levels of the third organic compound be HOMO3 and LUMO3, [I] and [II] are satisfied:

|LUMO2|>|LUMO3|[I]

|HOMO3|>|HOMO1|[II].

An organic light-emitting device that is highly efficient and has excellent driving durability characteristics. The present disclosure provides an organic light-emitting device including a substrate, a first electrode, a light-emitting layer, and a second electrode. The light-emitting layer contains a first organic compound, a second organic compound, and a third organic compound. A freely rotatable single bond in each of the first to third organic compounds is a carbon-carbon bond. At least one carbon of the freely rotatable carbon-carbon bond in the second organic compound is an sp.sup.2 carbon atom. Letting the HOMO energy level of the first organic compound be HOMO1, letting the LUMO energy level of the second organic compound be LUMO2, and letting the HOMO and LUMO energy levels of the third organic compound be HOMO3 and LUMO3, [I] and [II] are satisfied:

|LUMO2|>|LUMO3|[I]

|HOMO3|>|HOMO1|[II].