A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer disposed between the first electrode and the second electrode. The emission layer includes a first emission layer and a second emission layer. The first emission layer includes a first compound, and the second emission layer includes a second compound. The first compound includes at least one deuterium (D), and the second compound does not include deuterium. An electronic apparatus including the light-emitting device is also provided.

Organic light emitting devices are described wherein the emissive layer comprises a host material containing an emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, and the emissive molecule is selected from the group of phosphorescent organometallic complexes, including cyclometallated platinum, iridium and osmium complexes. The organic light emitting devices optionally contain an exciton blocking layer. Furthermore, improved electroluminescent efficiency in organic light emitting devices is obtained with an emitter layer comprising organometallic complexes of transition metals of formula L.sub.2MX, wherein L and X are distinct bidentate ligands. Compounds of this formula can be synthesized more facilely than in previous approaches and synthetic options allow insertion of fluorescent molecules into a phosphorescent complex, ligands to fine tune the color of emission, and ligands to trap carriers.

A method of making an osmium(II) complex having Formula I, L.sup.1-Os-L.sup.2, wherein L.sup.1 and L.sup.2 are independently a biscarbene tridentate ligand, wherein L.sup.1 and L.sup.2 can be same or different is disclosed. The method includes (a) reacting a precursor of ligand L.sup.1 with an osmium precursor to form an intermediate product, wherein the osmium precursor having the formula OsH.sub.x(PR.sub.3).sub.y, wherein x is an integer from 2 to 6 and y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; and (b) reacting a precursor of ligand L.sup.2 with said intermediate product.

Bis(tridentate) osmium(II) complexes containing phosphite groups useful as phosphorescent emitters are disclosed. The disclosed osmium(II) complexes have higher oxidation potential then previously known osmium(II) complexes. An organic light emitting device having an organic layer that includes the disclosed osmium(II) complex is also disclosed.

A compound comprising a first ligand L.sup.A of Formula I: ##STR00001##
is described. In Formula I, Z is selected from O, S, and Se; at least one of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 is nitrogen, while the remainder are carbon; Y.sup.1 and Y.sup.2 are independently selected from NR, O, and S; R, R.sup.A, R.sup.B, and R.sup.C are each independently selected from a variety of substituents, and adjacent substitutions in R, R.sup.A, R.sup.B, and R.sup.C are optionally joined to form a fused ring; ligand L.sup.A is at least a tridentate ligand coordinated to a metal M; M is coordinated to ring A and to ring B through metal-carbene bonds; and the ligand L.sup.A is optionally linked with other ligands to comprise a tetradentate, pentadentate or hexadentate ligand. Formulations and devices, such as an OLEDs, that include the compound with a ligand L.sub.A of Formula I are also described.

The present invention describes dibenzofuran derivatives substituted by electron-deficient heteroaryl groups, and electronic devices, especially organic electroluminescent devices, comprising these compounds as triplet matrix materials.

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

##STR00001##

is disclosed, where Z.sup.1 to Z.sup.4 are each independently C or N; at least one of Z.sup.1 to Z.sup.4 is N; and ring A is a structure of Formula II

##STR00002##

A heterocyclic compound represented by Formula 1 below, and an organic light-emitting device including the heterocyclic compound: ##STR00001##

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

##STR00001##

is disclosed. In the structure of Formula I, ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring; Z.sup.1-Z.sup.4 are each independently C or N; at least two consecutive Z.sup.1-Z.sup.4 are C, and are fused to a structure of Formula II

##STR00002##

or Formula III

##STR00003##

Y.sup.1; Y.sup.1 and Y.sup.2 are each independently O, S, Se, CRR′, SiRR′, or GeRR′; each R.sup.A, R.sup.B, R.sup.C, R, and R′ is a hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by the dashed lines in Formula I to form a five-membered chelate ring, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

An electronic apparatus includes an organic light-emitting device including: a first electrode, a second electrode facing the first electrode, m light-emitting units stacked between the first electrode and the second electrode and including at least one emission layer; and m-1 charge generating layers, each located between two neighboring light-emitting units of the m light-emitting units and including an n-type charge generating layer and a p-type charge generation layer, wherein m is an integer of 2 or more, at least one of the m-1 p-type charge generation layers includes a first doping layer and a second doping layer, the first doping layer includes a first organic material and a first inorganic material, the second doping layer includes a second organic material and a second inorganic material, and the first inorganic material and the second inorganic material are different from each other.