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##

Disclosed herein is an organic light-emitting diode capable of operating at a low voltage with high efficiency. It comprises: a first electrode; a second electrode facing the first electrode; and a light-emitting layer interposed between the first electrode and the second electrode, wherein the light-emitting layer comprises at least one of the amine compounds represented by the following Chemical Formula A or B, and the compound represented by the following Chemical Formula C. Chemical Formulas A, B and C are as described in the Specification.

A compound having a Pt tetradentate structure of Formula 1, ##STR00001##
is provided. In the structure of Formula 1, rings C and D each independently represent 5- or 6-membered carbocyclic or heterocyclic ring; L.sup.1, L.sup.2, and L.sup.3 are each independently a direct bond, BR, NR, PR, O, S, Se, C═O, S═O, SO.sub.2, SiRR′, GeRR′, alkyl, cycloalkyl, or a combination thereof; the sum of n1 and n2 is 1 or 2; X is selected from NR.sup.E, O, S, and Se; X.sup.3 and X.sup.4 each independently carbon or nitrogen; and one of Q.sup.1, Q.sup.3, and Q.sup.4 is oxygen, and the remaining two of Q.sup.1, Q.sup.3, and Q.sup.4 each represents a direct bond. Formulations and devices, such as an OLEDs, that include the compound of Formula 1 are also described.

A heteroleptic compound having a Formula Ir(L.sub.A).sub.m(L.sub.B).sub.3-m, having a structure of Formula I

##STR00001##

is disclosed. In Formula I, m is 1 or 2; moieties A, C, and D are each independently monocyclic rings or polycyclic fused ring structures; each R.sup.1, R.sup.2, R.sup.A, R.sup.B, R.sup.C, R.sup.D, and R.sup.E is independently hydrogen or a substituent; if moiety A is a monocyclic 6-membered ring, then the R.sup.A para to N of ring A is not an aryl group; at least one of R.sup.1 and R.sup.2 is selected from the group consisting of aryl, heteroaryl, cycloalkyl, heterocycloalkyl, and combinations thereof; and adjacent substituents can be joined to form a ring. OLEDs, consumer products, and formulations including the heteroleptic compound are also disclosed.

Provided is an electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, where the organic layer comprises a first compound having a structure of H-L-E and a second compound comprising a ligand L.sub.a having a structure of Formula C. Such a new material combination consisting of the first compound and the second compound can obtain higher efficiency in the device, significantly extend a lifetime, and provide better device performance. Further provided are a display assembly comprising the electroluminescent device and a compound combination.

Provided are an organic electroluminescent material and a device thereof. The organic electroluminescent material is a metal complex comprising a ligand L.sub.a having a structure of Formula 1. The metal complex may be used as a light-emitting material in an electroluminescent device. These novel compounds may be applied to electroluminescent devices and can exhibit better performance, achieve higher device efficiency, and significantly improve the overall performance of the devices. Further provided are an electroluminescent device comprising the metal complex and a compound combination comprising the metal complex.

Provided is an electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, where the organic layer comprises a first compound having a structure of H-L.sub.1-E and a second compound having a general formula of M(L.sub.a).sub.m(L.sub.b).sub.n(L.sub.c).sub.q, and the device has at least one maximum emission wavelength greater than 630 nm. Such a new material composition consisting of the first compound and the second compound can be used in a light-emitting layer of the electroluminescent device. The new material composition can achieve the emission of deep red light in the device, significantly reduce a drive voltage of the device while significantly improving device efficiency and/or a device lifetime, and provide better device performance. Further provided is a display assembly.

A fused ring compound and applications thereof in organic electronic components, particularly in organic electroluminescent diodes; an organic electronic component comprising the fused ring compound, and applications thereof in organic electroluminescent diodes and in display and lighting technologies; and a formulation comprising the fused ring compound, and applications thereof in the preparation of organic electronic components. By optimizing the component structure, good component performance can be achieved, and especially, a high-performance OLED component can be implemented, which provide good material and preparation technology choices for full-color display and lighting applications.

Provided are an organic electroluminescent material and a device thereof. The organic electroluminescent material is a metal complex comprising a ligand L.sub.a having a structure of Formula 1. The metal complex may be used as a light-emitting material in an electroluminescent device. These new compounds may be applied to electroluminescent devices and can exhibit better performance, achieve higher device efficiency, and significantly improve the overall performance of the devices. Further provided are an electroluminescent device comprising the metal complex and a compound combination comprising the metal complex.

Heteroleptic compounds having a Formula Ir(L.sub.A).sub.m(L.sub.B).sub.3-m, having the structure of Formula I

##STR00001##

or Formula II,

##STR00002##

are described. In Formula I and Formula II, moiety B is a polycyclic fused ring structure comprising at least four rings; ring C is a 5- or 6-membered aromatic ring; moieties D and E are independently a monocyclic or polycyclic fused ring structure; Z.sup.1 and Z.sup.2 are each independently C or N; each R.sup.A, R.sup.B, R.sup.C, R.sup.D, and R.sup.E is hydrogen or a General Substituent; and when ring C is a phenyl ring, R.sup.C collectively comprises two or more C atoms. Formulations, OLEDs, and consumer products incorporating the compounds are also described.