A composition including a first compound and a second compound, wherein the first compound is an organometallic compound including platinum and a tetradentate ligand bound thereto, and the second compound is an organometallic compound including iridium, μ(Pt) is about 0.5 debye to about 5.0 debye, μ(Pt) is less than μ(Ir), μ(Pt) is a dipole moment of the first compound, μ(Ir) is a dipole moment of the second compound, and each of μ(Pt) and μ(Ir) is calculated based on density functional theory as described herein.

An organometallic compound, represented by Formula 1:

M.sub.1(Ln.sub.1).sub.n1(Ln.sub.2).sub.n2  Formula 1

wherein, in Formula 1, M.sub.1 is a transition metal, Ln.sub.1 is a ligand represented by Formula 1-1, Ln.sub.2 is a ligand represented by Formula 2-1 or 2-2, n1 is 1 or 2, and n2 is 1 or 2:

##STR00001## wherein, in Formulae 1-1, 2-1, and 2-2, CY.sub.1, X.sub.21 to X.sub.28, X.sub.31, X.sub.32, R.sub.10, R.sub.31 to R.sub.37, R.sub.41 to R.sub.44, and b10 are as defined herein, and * and *′ each indicates a binding site to M.sub.1.

A platinum(IV) complex has the structure of Formula I.

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where X, X′, Y, Y′, and Z are each independently an electron donor ligand, R.sub.1˜R.sub.5 are each independently a functional group, L is the linker unit, and n is selected from the group of 0, a positive charge, and a negative charge. Various methods contain steps for manufacturing the platinum(IV) complex, for treating cancer, a tumor, or an infection in a subject with the platinum(IV) complex. A pharmaceutical composition contains the platinum(IV) complex.

A light-emitting device with high resistance to heat in a fabrication process is provided. The light-emitting device includes an EL layer between an anode and a cathode. The EL layer includes at least a light-emitting layer and an electron-transport layer that includes a first electron-transport layer in contact with the light-emitting layer and a second electron-transport layer in contact with the first electron-transport layer. The first electron-transport layer includes a first heteroaromatic compound including at least one heteroaromatic ring. The second electron-transport layer includes a second heteroaromatic compound that includes at least one heteroaromatic ring and is different from the first heteroaromatic compound. The first heteroaromatic compound has a difference of 20° C. or less between the crystallization temperature (Tpc) of a powder state and the crystallization temperature (Ttc) of a thin film state. The second heteroaromatic compound has a difference of 100° C. or less between Tpc and Ttc.

Provided are iridium complexes having a ligand L.sub.A of Formula I

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Also provided are formulations comprising these iridium complexes. Further provided are OLEDs and related consumer products that utilize these iridium complexes.

The present invention relates to a metal iridium complex and application thereof. The metal iridium complex has a structure as shown in the following formula (I). The compound provided in the present invention has the advantages of low sublimation temperature, great optical and electrical stability, high luminescence efficiency, long service life, and high color saturation, and can be used in organic light-emitting devices. In particular, the complex has the potential for application in the AMOLED industry as a red light-emitting phosphorescent material.

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The present invention relates to a metal iridium complex and application thereof. The metal iridium complex has a structure as shown in the following formula (I). The compound provided in the present invention has the advantages of low sublimation temperature, great optical and electrical stability, high luminescence efficiency, long service life, and high color saturation, and can be used in organic light-emitting devices. In particular, the complex has the potential for application in the AMOLED industry as a red light-emitting phosphorescent material.

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Provided is an organometallic complex represented by general formula (1) below.

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In formula (1), X.sub.1 to X.sub.3 are each independently selected from a carbon atom and a nitrogen atom, and at least one of X.sub.1 to X.sub.3 is a nitrogen atom. The carbon atom has a hydrogen atom or a substituent. Y is an aryl group or a heterocyclic group. L is a bidentate ligand. When a plurality of L's are present, the plurality of L's may be the same or different. M is a metal atom selected from Ir, Pt, Rh, Os, and Zn. m represents an integer of 1 to 3, and n represents an integer of 0 to 2. R.sub.1 to R.sub.5 each represent a hydrogen atom or a substituent.

Provided is an organometallic complex represented by general formula (1) below.

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In formula (1), X.sub.1 to X.sub.3 are each independently selected from a carbon atom and a nitrogen atom, and at least one of X.sub.1 to X.sub.3 is a nitrogen atom. The carbon atom has a hydrogen atom or a substituent. Y is an aryl group or a heterocyclic group. L is a bidentate ligand. When a plurality of L's are present, the plurality of L's may be the same or different. M is a metal atom selected from Ir, Pt, Rh, Os, and Zn. m represents an integer of 1 to 3, and n represents an integer of 0 to 2. R.sub.1 to R.sub.5 each represent a hydrogen atom or a substituent.

A light emitting device that includes a first electrode, a second electrode oppositely disposed to the first electrode, and an emission layer between the first electrode and the second electrode is provided. The emission layer includes an organometallic compound represented by Formula 1:

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