A novel compound having a benzimidazole based structure is disclosed that is selected from one of the following structures: ##STR00001##
The compound is useful in improving photophysical performance of OLEDs.

The present invention relates to a compound, a display panel and a display device. The compound has a structure represented by Formula I. The compound takes a spiro structure as a non-conjugated connecting unit, and a boron-containing group as an electron-accepting group. A light-emitting compound obtained by taking the group as a building block has a narrower half-peak width and higher color purity. The boron-containing spiro structure is connected with an electron-donating group to obtain a bipolar compound, and as a thermal activation delay fluorescence material, the bipolar compound can be used a light-emitting layer material, particularly a doped material, and can also be used as a fluorescent host material or a phosphorescent host material. The compound provided herein can achieve low drive voltages and high luminescence efficiencies when applied to organic electroluminescent devices.

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.

The present invention provides 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, wherein the compound is represented by Formula (1): ##STR00001## wherein: A is a substituent represented by Formula (A-1)-(A-2); ##STR00002##

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.

In one aspect, provided is a compound of Formula I,

##STR00001##

In Formula I, M is Pt or Pd; L has the structure

##STR00002##

F.sub.1 is

##STR00003##

or a direct bond; rings A, B, C, D, and F are independently monocyclic rings or multicyclic fused ring systems; each of X.sup.1 to X.sup.10 is independently C or N; each of Z.sup.1 to Z.sup.4 is C or N; each of L.sup.1 to L.sup.5 is a direct bond or an organic linker; each of a, b, c, and d is 0 or 1; each K.sup.1 to K.sup.4 is a direct bond, O, or S; each of Z.sup.1 to Z.sup.4 that is connected to O or S is C; and each R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, and R.sup.X is independently hydrogen or a substituent.

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.

An organometallic compound represented by Formula 1:

M.sub.1(L.sub.11).sub.n11(L.sub.12).sub.n12  Formula 1

wherein, in Formula 1, M.sub.1 is a first-row transition metal, a second-row transition metal, or a third-row transition metal, L.sub.11 is a ligand represented by Formula 1-1, L.sub.12 is a monodentate ligand or a bidentate ligand, n11 is 1, and n12 is 0, 1, or 2:

##STR00001##

wherein ring CY.sub.1 to ring CY.sub.4, E.sub.1, T.sub.1 to T.sub.4, R.sub.10 to R.sub.40, X.sub.1 to X.sub.4, n1 to n4, a1 to a4, and c10 to c40 may each be understood by referring to the descriptions thereof provided herein, and *1, *2, *3, and *4 are each a binding site to M.sub.1 in Formula 1.

Provided are a polycyclic compound represented by Formula 1, an organic light-emitting device including the polycyclic compound, and an electronic apparatus including the organic light-emitting device:

##STR00001##

Formula 1 may be understood by referring to the description of Formula 1 provided herein.