Provided is an organic light-emitting device including an anode; a cathode; a light-emitting layer between the anode and the cathode and including a compound of Chemical Formula 2:

##STR00001## a first organic material layer between the anode and the light-emitting layer and including a compound of Chemical Formula 1:

##STR00002## and a second organic material layer between the light-emitting layer and the cathode and including a compound of Chemical Formula 3:

##STR00003## wherein: Ar101, Ar102 and R101 to R108 are each independently hydrogen, deuterium, or a substituted or unsubstituted alkyl or aryl group; Ar1 and Ar2 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted silyl, alkyl, cycloalkyl, or aryl group; R201 to R204 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted alkyl, cycloalkyl, aryl group, or heterocyclic group; and Z is O or S.

The present invention relates to a composition for an organic optoelectronic element, and an organic optoelectronic element and a display device including same, the composition comprising a first compound, a second compound, and a third compound, wherein the first compound is represented by Chemical Formula I, the second compound is represented by Chemical Formula II, and the third compound is represented by Chemical Formula IIIA or Chemical Formula IIIB.

The details of Chemical Formula I, Chemical Formula II, Chemical Formula IIIA and Chemical Formula IIIB are the same as those described in the specification.

The present invention describes dibenzofuran derivatives substituted by electron-deficient heteroaryl groups, and electronic devices, especially organic electroluminescent devices, comprising these compounds as triplet matrix materials.

A compound having the formula Ir(L.sub.A).sub.n(L.sub.B).sub.3-n, having the structure

##STR00001##

of Formula I is provided. In the structure of Formula I, each of A.sup.1 through A.sup.8 is independently carbon or nitrogen; at least one of A.sup.1 through A.sup.8 is nitrogen; ring B is bonded to ring A through a C—C bond; the iridium is bonded to ring A through an Ir—C bond; X is O, S, or Se; each of R.sup.1 through R.sup.5 are independently selected from a variety of substituents, whichmay be linked for form a ring; n is an integer from 1 to 3; and at least one R.sup.2 adjacent to ring C is not hydrogen. Formulations and devices, such as OLEDs, that include the first compound are also provided.

The present invention relates to the technical field of organic light-emitting materials, and provides a tetradentate cyclometalated platinum (II) coordination complex based on carboxyl coordination and containing pyridyl acridine, and use thereof. The tetradentate cyclometalated platinum (II) coordination complex has the structure of the general formula (I):

##STR00001##

In the present invention, the tetradentate cyclometalated platinum (II) coordination complex includes a tetradentate ligand containing a strong-field ligand of an oxygen negative ion, with strong coordination capability and high rigidity, which can improve the quantum efficiency and photostability.

Provided are a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof.

A compound of Chemical Formula 1, and an organic light emitting device including the same, the compound used as a material of an organic material layer of the organic light emitting device and providing high color purity and enhanced lifetime properties.

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An organic light emitting diode and an organic light emitting device including the organic light emitting diode are discussed. The organic light emitting diode can include a first compound represented by the following formula, a second compound as a p-type host and a third compound as an n-type host in an emitting material layer. As a result, the organic light emitting diode and the organic light emitting device have advantages in the driving voltage, the luminous efficiency and the lifespan.

##STR00001##

The present disclosure relates to a plurality of host materials, an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure or by comprising a specific combination of compounds according to the present disclosure as a plurality of host materials, it is possible to produce an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifetime properties compared to the conventional organic electroluminescent devices.

An organometallic compound, represented by Formula 1:

M.sub.1(Ln.sub.1).sub.n1(Ln.sub.2).sub.n2  Formula 1

wherein, Ln.sub.1 is a ligand represented by Formula 1-1, Ln.sub.2 is a ligand represented by Formula 2-1 or Formula 2-2, n1 may be 1 or 2, and n2 may be 1 or 2, wherein the other substituents may be understood by referring to the descriptions thereof provided herein:

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