A compound of formula (11) to (13)

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wherein R.sub.1 to R.sub.4 are each independently D.sub.1 of a formula (1-1) etc. or D.sub.2 of a formula (2-1) etc.

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at least one of R.sub.1 to R.sub.4 being D.sub.1, and at least one of R.sub.1 to R.sub.4 being D.sub.2. In (1-1) and (2-1), X.sub.1 is O or S, R.sub.101 to R.sub.110 and R.sub.161 to R.sub.168 are each independently H, a substituent etc. In at least one D.sub.1, at least one of R.sub.101 to R.sub.110 is a group of a formula (110) or (120):

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Z.sub.1 is a C etc., a ring (B) is an aromatic hydrocarbon ring etc., Y.sub.12 to Y.sub.14 are each independently CR.sub.10A etc., Y.sub.21 to Y.sub.24 are each independently CR.sub.20A etc., Z.sub.2 is an aryl group etc., and * is a bonding position.

An organoelectroluminescent device according to the present invention is capable of low voltage driving, has an excellent external quantum efficiency and exhibits highly efficient light-emitting characteristics by employing compounds having distinct structures, as a hole transport material and a dopant material, in a hole injection layer or a hole transport layer, and a light-emitting layer, respectively, and thus can be industrially utilized in a flat display device, a flexible display device, a monochrome or white flat panel lighting apparatus, a monochrome or white flexible lighting apparatus and the like.

An organic light-emitting device includes: an anode, an emitting layer, and a cathode that are stacked; a first functional material layer located between the emitting layer and the anode; and a second functional material layer located between the emitting layer and the cathode. Under a same test condition, a hole mobility of a material of the first functional material layer is at least ten times an electron mobility of a material of the second functional material layer.

An organic electroluminescent device and a display apparatus. The organic electroluminescent device includes a first electrode, a second electrode and an organic layer disposed between the first electrode and the second electrode, where the organic layer includes an emission layer (EML), the EML includes a host material, a thermally activated delayed fluorescence (TADF) sensitizer and a fluorescent dye, and the fluorescent dye is selected from a compound represented by Formula (1).

A compound including a bidentate ligand L.sub.A comprising a structure of Formula I,

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is disclosed. In Formula I, ring A′ is a 7-, 8-, or 9-membered ring structure; X is of NR.sup.2, O, CR, CRR′, S, or SiRR′; each of R.sup.A′, R.sup.1, and R.sup.2 is independently hydrogen or a substituent; R.sup.1′ is independently absent or a hydrogen or a substituent; any two adjacent R.sup.A′, R.sup.1, R.sup.1′, and R.sup.2 can be joined or fused to form a ring; the ligand L.sub.A is coordinated to a metal, which is selected from Os, Ir, Pd, Pt, Cu, Ag, or Au; and (1) at least one of R.sup.1 and R.sup.2 is coordinated to the metal M, or (2) at least one R.sup.A′ comprises a 5- or 6-membered carbocyclic or heterocyclic ring that is not directly fused to Ring A′ and is coordinated to the metal M, or both (1) and (2) are true. Formulations, devices, and consumer products including the compound are also disclosed.

A light emitting 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. The emission layer includes a fused polycyclic compound represented by Formula 1.

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A light emitting element includes a first electrode, a second electrode, and at least one functional layer which is disposed between the first electrode and the second electrode and includes a compound represented by Formula 1 below, thereby exhibiting high efficiency characteristics. The compound of Formula 1 may be included in the emission layer of the light emitting element as a dopant.

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Provided are boron substituted organometallic compounds of Formula I:

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Also provided are formulations including these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.

An organic light emitting device having a light emitting layer that contains first to fourth organic compounds satisfying the following formulae has a long emission lifetime and is stable. The second organic compound is a delayed fluorescent material, and the amount of light emission from the fourth organic compound is the maximum. E.sub.S1 is a lowest excited singlet energy, E.sub.T1 is a lowest excited triplet energy. E.sub.S1(1)>E.sub.S1(4)>E.sub.S1(2)>E.sub.S1(3), E.sub.T1(1)>E.sub.T1(2)>E.sub.T1(3)>E.sub.T1(4).

Embodiments provide a condensed cyclic compound, a light-emitting device including the condensed cyclic compound, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer; and the condensed cyclic compound. The condensed cyclic compound is represented by Formula 1:

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The description of Formula 1 is provided in the specification.