Provided are an organic electric element comprising as a phosphorescent host material, a mixture of the compounds of Formula (1) and Formula (2), and an organic electronic device or apparatus thereof for achieving a high luminous efficiency, a low driving voltage, and an improved lifespan.

Provided are compounds, formulations comprising compounds, and devices that utilize compounds, where the devices include a substrate, a first electrode, an organic emissive layer comprising an organic emissive material disposed over the first electrode. The device includes an enhancement layer, comprising a plasmonic material exhibiting surface plasmon resonance that non-radiatively couples to the organic emissive material and transfers excited state energy from the organic emissive material to the non-radiative mode of surface plasmon polaritons. The enhancement layer is provided no more than a threshold distance away from the organic emissive layer, where the organic emissive material has a total non-radiative decay rate constant and a total radiative decay rate constant due to the presence of the enhancement layer. At least one of the organic emissive material and the organic emissive layer has a vertical dipole ratio (VDR) value of equal or greater than 0.33.

Compounds of formula (1):

##STR00001##

wherein each symbol is as defined in the description, may provide an organic electroluminescence device having a further improved performance.

The present invention relates to a platinum metal complex and an application thereof in an organic light-emitting device. The platinum metal complex is a compound having a structure of chemical formula (I). An organic light-emitting device to which the compound is applied has a relatively low driving voltage, a relatively high luminous efficiency and improved service life to a certain extent; therefore, the complex has the potential of being applied in the field of organic light-emitting devices. Also provided is an organic light-emitting device, including a cathode, an anode, and an organic layer. The organic layer is one or more of a hole injection layer, a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer; and at least one layer in the organic layer contains the compound of structural formula (I).

##STR00001##

Provided are a triarylamine derivative and an organic electroluminescent device thereof, which relate to the technical field of organic electroluminescence. The triarylamine derivative has a relatively high triplet energy level, high hole mobility, a high refractive index and good film formability and thermal stability and can effectively reduce the driving voltage of the organic electroluminescent device, improve the luminescence efficiency, and extend the service life of the device when applied to the organic electroluminescent device. The triarylamine derivative has a good application effect and a good industrialization prospect in the organic electroluminescent device.

A compound comprising a first ligand L.sub.A of Formula I

##STR00001##

is described. In Formula I, X.sup.1 and X.sup.6 to X.sup.10 are each independently C or N; X.sup.2 is CR.sup.1′ or N; X.sup.3 is CR.sup.1 or N; X.sup.4 is CR.sup.2 or N; X.sup.5 is CR.sup.3 or N; each R.sup.1, R.sup.2, R.sup.3, R.sup.A, R.sup.B, and R.sup.C is independently a hydrogen or a General Substituent; any two substituents may be joined or fused to form a ring; at least one of R.sup.1′, R.sup.1, R.sup.2, and R.sup.3 is a partially or fully deuterated alkyl or cycloalkyl group; at least one pair of R.sup.C are joined or fused to form a 5-membered or 6-membered ring. Formulations, OLEDs, and consumer products comprising the compound are also described.

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.

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

##STR00001##

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

A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.