The present invention relates to iridium complexes suitable for use in organic electroluminescent devices, especially as emitters.

An organic light-emitting device including a predetermined host and a thermally activated delayed fluorescence emitter.

An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer. The emission layer includes at least one organometallic compound of Formula 1, and at least one selected from a second compound and a third compound, where the organometallic compound, the second compound, and the third compound are different from each other. When the emission layer comprises both the second compound and the third compound, the second compound and the third compound form an exciplex, and the organometallic compound and the second compound and/or the third compound do not form an exciplex:
M(L.sub.1).sub.n1(L.sub.2).sub.n2,  Formula 1
wherein in Formula 1, L.sub.1 is represented by Formula 2-1: ##STR00001##

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 is an organic light-emitting device including: an anode; a cathode provided to face the anode; a light-emitting layer provided between the anode and the cathode; a first organic material layer provided between the anode and the light-emitting layer; and a second organic material layer provided between the cathode and the light emitting layer in which each organic material, from among organic materials included in the light-emitting layer and the organic material layers, the band gap energy (E.sub.bg) of each of the organic materials except for a dopant compound is 3 eV or more, the first organic material layer comprises one or more compounds each composed of centrally sp3 carbon, the second organic material layer includes one or more compounds each composed of centrally sp3 carbon, and the first organic material layer and the second organic material layer include three or more compounds each composed of centrally sp3 carbon.

Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime.

An organic electroluminescent device comprising one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers contains an organic emission material having a difference between excited singlet energy (S1) and excited triplet energy (T1) (ΔEST) of 0.20 eV or less as a light emitting dopant, a first host selected from the compounds represented by the following general formula (1), and a second host selected from the compounds represented by the following general formula (2).

##STR00001##

Devices having multiple multicomponent emissive layers are provided, where each multicomponent EML includes at least three components. Each of the components in each EML is a host material or an emitter. The devices have improved color stability and relatively high luminance.

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.

A light emitting element that includes a first electrode, a second electrode on 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. The light emitting element exhibits long lifespan properties.

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