The present invention relates to a an organic electroluminescent device comprising at least one light-emitting layer B comprising at least one host material H.sup.B, at least one thermally activated delayed fluorescence (TADF) material E.sup.B, and at least one small full width at half maximum (FWHM) emitter S.sup.B wherein E.sup.B transfers energy to S.sup.B and S.sup.B emits light with an emission maximum in the wavelength range from 500 nm to 560 nm.

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

Provided are bisoxaborinine compounds. The compound comprises a structure of Formula I

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Also provided are formulations comprising these bisoxaborinine compounds. Further provided are OLEDs and related consumer products that utilize these bisoxaborinine compounds. The OLEDs comprise an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises the compound of Formula I.

The present invention relates to a compound and an application thereof. The compound has a structure as shown in Formula I. The compound provided by the present invention has the advantages of being low in sublimation temperature, good in photo-stability and electrical stability, high in luminous efficiency, long in service life, and high in color saturation and the like, and can be applied to an organic light emitting device, particularly as a red luminous phosphorescent material, and has the possibility of being applied to the AMOI ED industry.

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This invention relates to an iridium metal complex. The iridium metal complex comprises no more than three 1,3-dihydro-2H-benzo[d]imidazol-2-ylidene based carbene cyclometalate ligands. The iridium metal complex provides a blue emission. This is useful for organic light emitting diode (OLED) components where blue emitters have trailed behind the advances of red and green emitters.

The present invention relates to a compound of formula (I), wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently hydrogen or R.sup.a, with proviso that a pair of two substituents selected from R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, and R.sup.3 and R.sup.4 is linked to one another and forms a group of formula (II); a material for an organic electroluminescence device comprising at least one compound of formula (I); an organic electroluminescence device which comprises an organic thin film layer be-tween an anode and a cathode, wherein the organic thin film layer comprises one or more layers and comprises a light emitting layer, and at least one layer of the organic thin film layer comprises at least one compound of formula (I); and an electronic equipment comprising the inventive organic electroluminescence device. ##STR00001##

An organic EL device includes: an anode, a cathode, and an emitting layer, in which the emitting layer contains a first compound of a formula (1), a second compound of a formula (2), and a third compound that exhibits delayed fluorescence, and singlet energies S.sub.1 of the first compound, the second compound, and the third compound satisfy Numerical Formula 1 and Numerical Formula 2.

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In the formula (1), A represents a group of a formula (a1) or the like, L represents a linking group or the like, and B represents an aryl group or the like. The first compound of the formula (1) has no carbonyl group. In the formula (2), Y.sub.21 to Y.sub.26 each independently represent an N atom, CR.sub.A, or the like. R.sub.A represents a substituent, a group of a formula (2A), or the like.

A heterocyclic compound represented by Formula 1:

##STR00001## wherein, Ar.sub.1 is a group represented by Formula 2, Ar.sub.1 includes at least one cyano group, A.sub.1, A.sub.2, L.sub.1, a1, Ar.sub.11, Ar.sub.12, Ar.sub.13, m1, R.sub.1, R.sub.10, R.sub.20, R.sub.30, b.sub.1, b.sub.10, b.sub.20, and b.sub.30 are the same as described in the present disclosure, and * and *′ each indicate a binding site to a neighboring atom.

An organic electroluminescence device includes: an emitting region provided between a cathode and an anode; and a hole transporting zone provided between the anode and the emitting region, in which the hole transporting zone includes at least a first anode side organic layer and a second anode side organic layer, the first anode side organic layer is in direct contact with the second anode side organic layer, a total film thickness of the hole transporting zone is in a range from 20 nm to 80 nm, the first anode side organic layer contains no compound contained in the second anode side organic layer, the first anode side organic layer contains a first organic material and a second organic material, the first organic material is different from the second organic material, and a content of the first organic material in the first anode side organic layer is less than 50 mass %.

A compound represented by a combination of Chemical Formula 1 and Chemical Formula 2 bonded together, a composition including the compound, an organic optoelectronic device, and a display device are disclosed. ##STR00001## In Chemical Formula 1 and Chemical Formula 2, each substituent is the same as described in the specification.