An organometallic compound is represented by Formula 1. An organic light-emitting device includes a first electrode, a second electrode, and an organic layer including an emission layer between the first electrode and the second electrode, wherein the organic layer includes at least one of the organometallic compound represented by Formula 1. An apparatus includes the organic light-emitting device.

Disclosed is an organometallic compound represented by a following Chemical Formula I, wherein the compound is a metal complex including a central coordination metal and a main ligand binding thereto, wherein the main ligand has a structure in which a fused ring is further introduced into 2-phenylquinoline. When the organometallic compound is used as dopant of a light-emitting layer of an organic electroluminescent device, rigidity is imparted to the organometallic compound molecule such that a full width at half maximum (FWHM) is narrow and thus color purity is improved. Further, a non-luminescent recombination process is reduced such that luminous efficiency and lifespan of the organic electroluminescent device are improved. Chemical Formula I is shown below:

##STR00001##

The present disclosure relates to a plurality of host materials comprising a first host material including a compound represented by formula 1 and a second host material including a compound represented by formula 2, and an organic electroluminescent device comprising the same. In addition, the present disclosure relates to an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound and/or a specific combination of compounds according to the present disclosure as host materials, an organic electroluminescent device having high luminous efficiency and long lifespan property can be provided.

Provided is a compound including a first ligand L.sub.A of Formula I,

##STR00001##

In Formula I, moiety A is a monocyclic ring or a multicyclic fused ring system; one of X.sup.1, X.sup.2, and X.sup.3 is C and is connected to X.sup.4; one of X.sup.1, X.sup.2, and X.sup.3 is N and is coordinated to a metal M; and the remaining one of X.sup.1, X.sup.2, and X.sup.3 is CR or N; X.sup.4 is C or N; Y is a divalent linking group; each R, R′, R.sup.A, and R.sup.B is independently hydrogen or a General Substituent; each of K.sup.1 and K.sup.2 is independently direct bond, O, or S; and metal M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au. Formulations, OLEDs, and consumer products including the same are also provided.

A metal complex having at least one chelating N-heterocyclic carbene ligand. The 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.

Metal complexes with ligands bearing a five member aromatic moiety fused with dibenzofuran or its analogues useful as electroluminescence materials in OLEDs are disclosed.

A ligand for metal complexes are disclosed, in which an imidazole ring is fused to an aromatic ring as a substituent or an imidazole ring is fused to a six-member ring of the original ligand. The features of these elements within the ligand afford a better device performance in general OLED device.

A compound including a first ligand L.sub.A of Formula I ##STR00001##
is disclosed. In the structure of Formula I, one of L.sup.1 and L.sup.2 is C, and the other is N; Y.sup.1 to Y.sup.14 are each C or N; at least two adjacent Y.sup.7, Y.sup.8, Y.sup.9, and Y.sup.10 are carbon atoms that are fused to a structure of Formula II ##STR00002##
Z.sup.1 and Z.sup.2 are each O, S, Se, NR, CRR′, or SiRR′; and each R, R′, R.sup.A, R.sup.B, R.sup.C, and R.sup.D is hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by L.sup.1 and L.sup.2, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

The present specification provides a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device comprising the same, a composition for an organic material layer of an organic light emitting device, and a method for manufacturing an organic light emitting device.

To provide an organic electroluminescent device realizing high efficiency and low voltage characteristics. A light-emitting layer including compounds of (1) and (2) and a dopant is included. X represents N or CR.sup.3, wherein at least one X represents N. R.sup.1 represents (1b), R.sup.2 represents (1c), and R.sup.3 represents an alkyl group or the like. Y represents O, S, NR.sup.4, or CR.sup.5R.sup.6, R.sup.4 to R.sup.6 each represent an alkyl group or the like, and one of R.sup.7 to R.sup.14 binds to a ring in (1). * represents a binding position to a ring in (1), and rings C and D are each an aromatic ring fused to an adjacent ring. R.sup.15, R.sup.16 and R.sup.17 have the same meaning as R.sup.3 (a and b represent the number of substitutions). R.sup.19 has the same meaning as R.sup.4, and R.sup.20 to R.sup.27 each represent CR.sup.3, CR.sup.28 or N and at least one thereof represents CR.sup.28, and R.sup.28 represents formula (2b). Z represents O, S, NR.sup.37, or CR.sup.38R.sup.39, R.sup.37 to R.sup.39 each has the same meaning as R.sup.4, and one of R.sup.29 to R.sup.36 binds to a ring in (2) and the others represent CR.sup.3 or N.