Provided is an organic light-emitting device including a light-emitting layer comprising a compound of Chemical Formula 1, and a first organic material layer comprising a compound of Chemical Formula 2:

##STR00001## wherein: Cy1 to Cy5 are each independently one selected from the group consisting of a substituted or unsubstituted: aromatic hydrocarbon ring, aliphatic hydrocarbon ring, and an aromatic hetero ring, or a ring in which two or more rings selected from the above group are fused, one or more of Cy1 to Cy5 are a ring of the following Chemical Formula 1-A,

##STR00002##

wherein: Ar1 and Ar2 are the same as or different from each other, and are each independently a phenyl, a biphenyl, a terphenyl, a naphthyl, a phenanthrenyl, or a triphenylenyl, where the naphthyl, phenanthrenyl, and triphenylenyl can be substituted with a phenyl.

Provided is a compound of Formula I

##STR00001##

in which at least one moiety A, moiety B, moiety C, or moiety D is a 6-membered carbocyclic or heterocyclic ring, and at least one R.sup.A, R.sup.B, R.sup.C, or R.sup.D includes a group having Formula II

##STR00002##

where R.sup.X can be silyl, germyl, boryl, nitrile, F, CF.sub.3, cycloalkyl, heterocycloalkyl, or monocyclic heteroaryl. The compounds are useful as emitters in OLEDs providing improved efficiency.

The present disclosure provides for an organic electroluminescent device (OLED) including an anode; a cathode; and an emissive layer, disposed between the anode and the cathode. The emissive layer includes a phosphorescent dopant, a first host, and a second host, wherein the first host transports holes, the second host transports electrons, and the first host is fully or partially deuterated. Consumer products that include the OLED are also provided.

An organic electroluminescence device may include a first electrode, a second electrode opposite to the first electrode, and organic layers disposed between the first electrode and the second electrode. At least one of organic layers may include an organometallic complex including a first metal complex having a metal atom as a center atom of the first metal complex, a second metal complex having the metal atom as a center atom of the second metal complex, and an aromatic ring group connecting the first metal complex to the second metal complex.

Highly thermal and photo-stable inorganic-organic hybrid phosphor compounds, in which a copper (I) halide module is coordinated with a multi-dentate organic ligand. Also disclosed are semiconductor and light emitting devices comprising these materials, including light emitting diodes, and methods of preparing these materials and devices.

An organic electroluminescence device includes an anode, a cathode, and an emitting layer disposed between the anode and the cathode. The emitting layer comprises a delayed fluorescent compound M2 having at least one deuterium atom and a compound M3 having at least one deuterium atom. A singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy the relationship S.sub.1(M3)>S.sub.1(M2).

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

##STR00001##

is provided. In Formula I, each of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 represents CR, CRR′, NR, or N; Y is selected from a linking group; each of R, R′, R″, R.sup.1, R.sup.1′, R.sup.2, R.sup.2′, R.sup.3, R.sup.3′, R.sup.4, and R.sup.4′ is hydrogen or a substituent; each represents a single bond or a double bond; any two adjacent substituents may be joined or fused to form a ring; two adjacent ones of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are joined together to form a fused 5-membered heterocyclic ring, Ring A, while the remaining two of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 cannot be joined to form an aromatic ring; and Ring A is joined to a metal M by a direct bond. Formulations, OLEDs, and consumer products comprising the compound are also provided.

A condensed cyclic compound represented by Formula 1: ##STR00001## wherein in Formula 1, Ar.sub.1 and R.sub.1 to R.sub.8 are the same as described in the specification.

Provided are organometallic compounds. Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.

Disclosed is an organic electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and a first organic layer disposed between the anode and the cathode, wherein the first organic layer contains a first compound having a structure of Formula 1 and a second compound having a structure of Formula 2. Such a novel material combination composed of the first compound and the second compound may be used in a hole injection layer in the organic electroluminescent device and can endow the organic electroluminescent device with excellent characteristics of low voltage, high efficiency and a long lifetime and provide better device performance. Further disclosed are a display assembly and a compound combination.