A compound comprising a first ligand L.sub.A, where L.sub.A comprises a structure of Formula I,

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is provided. In Formula I, each of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 represents CR, CRR′, NR, or N; Y is selected from a linking group; each of R, R′, R″, R.sup.1, R.sup.1′, R.sup.2, R.sup.2′, R.sup.3, R.sup.3′, R.sup.4, and R.sup.4′ is hydrogen or a substituent; each represents a single bond or a double bond; any two adjacent substituents may be joined or fused to form a ring; two adjacent ones of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are joined together to form a fused 5-membered heterocyclic ring, Ring A, while the remaining two of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 cannot be joined to form an aromatic ring; and Ring A is joined to a metal M by a direct bond. Formulations, OLEDs, and consumer products comprising the compound are also provided.

The present specification relates to a nitrogen-containing compound, and a color conversion film, a backlight unit and a display apparatus including the same.

Provided are compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications. Also provided are formulations comprising these compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications. Further provided are OLEDs and related consumer products that utilize these compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications.

The present disclosure provides a compound including a first ligand L.sub.A of Formula I,

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In Formula I, ring A is a 7 to 12-membered heterocyclic ring that is fused to ring B, which is a 5-membered or 6-membered heterocyclic ring; ring C is a 5- or 6-membered ring; n is 1 or 2; X is selected from B, N, Al, In, and Ga; each W is selected from NR, O, S, Se, SO, SO.sub.2, BR, CRR′, C═CRR′, SiRR′, PRR′, and GeRR′; each of Z.sup.1, Z.sup.2, and Z.sup.3 is independently C or N; at least one of Z.sup.1, Z.sup.2, and Z.sup.3 is N; each R, R′, R.sup.A, R.sup.B, and R.sup.C is hydrogen or general substituent; each of K.sup.1 and K.sup.2 is a direct bond, O, or S; L.sub.A is coordinated to a metal M. Formulations, OLEDs, and consumer products containing the compound are also disclosed.

Provided are compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications. Also provided are formulations comprising these compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications. Further provided are OLEDs and related consumer products that utilize these compounds comprising ligands L.sub.A that are ligands of Pt and Ir complexes for OLED applications.

The present disclosure relates to an organic electroluminescence device including an organometallic compound represented by Formula 1 or Formula 2 below in an emission layer, to achieve long service life of the organic electroluminescence device. ##STR00001##

The present invention relates to a polycyclic aromatic derivative and an electroluminescent device comprising same. The electroluminescent device according to the present invention comprises a polycyclic aromatic derivative as a dopant compound in a light-emitting layer thereof and also employs an anthracene derivative having a characteristic structure, as a host in combination therewith, in the light-emitting layer, whereby the electroluminescent device can have excellent color purity, high light-emitting efficiency, and a remarkably improved long lifespan, and thus can be advantageously used in various display devices.

Provided are OLEDs and related electronic devices that utilize these OLED devices. The OLED includes an emissive region that includes a sensitizer and an acceptor, where the sensitizer has a lowest excitation energy state E.sub.T1, and is capable of harvesting triplet excitons; where the acceptor is capable of receiving energy from the sensitizer and functioning as a fluorescent emitter at room temperature; where the acceptor has a first moiety and a second moiety, the first moiety having a lowest singlet excitation energy state E.sub.S1.sup.A and a lowest triplet excitation energy state E.sub.T1.sup.A, and the second moiety having a lowest singlet excitation energy state E.sub.S1.sup.B and a lowest triplet excitation energy state E.sub.T1.sup.B; and where E.sub.S1.sup.A<E.sub.S1.sup.B, E.sub.T1.sup.A>E.sub.T1.sup.B, and E.sub.T1>E.sub.S1.sup.A.

An infrared-emitting compound has a structure represented by the following Formula (1a). In Formula (1a), Ar and ring A each independently represent an aryl ring, a heteroaryl ring or a fused ring thereof. Q-Ar represents an infrared-emitting residue. R.sub.1 represents a group in which a dihedral angle between Ar and ring A is 45 degree or more. And a thick line represents a single bond or a double bond.

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An aromatic compound which improves emission efficiency and an organic electroluminescence device including the same are provided. The organic electroluminescence device includes: a first electrode; a second electrode opposite to the first electrode; and a plurality of organic layers between the first electrode and the second electrode, where at least one organic layer among the plurality of organic layers includes the aromatic compound. The aromatic compound is represented by Formula 1 below. ##STR00001##