Disclosed are polycyclic aromatic compounds that can be employed in various organic layers of organic electroluminescent devices. Also disclosed are organic electroluminescent devices including the polycyclic aromatic compounds. The organic electroluminescent devices are highly efficient and long lasting and have greatly improved luminous efficiency.

Provided are ortho-substituted biphenyl compounds with one or more bicarbazole linkages. Also provided are formulations comprising these ortho-substituted biphenyl compounds. Further provided are OLEDs and related consumer products that utilize these ortho-substituted biphenyl compounds.

Materials are provided for use as active emissive layers in organic electronic devices such as light-emitting filed effect transistors. Light-emitting transistors (LET) are an alternative to light-emitting diodes and have several important benefits, however, materials developed specifically for LET are quite scarce. Herein a new family of materials is disclosed that has been developed specifically for LET.

Glucose-sensing luminescent dyes, polymers, and sensors are provided. Additionally, systems including the sensors and methods of using these sensors and systems are provided.

A compound of Formula 1, as disclosed herein, is useful in an organic light emitting device and apparatuses including the same.

A compound that emits fluorescence and delayed fluorescence is provided as a material for an organic electroluminescent device of high efficiency, and an organic photoluminescent device and an organic electroluminescent device of high efficiency and high luminance are provided using this compound. The spiro compound of a general formula (1) having an azafluorene ring structure is used as a constituent material of at least one organic layer in an organic electroluminescent device that includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes. ##STR00001##

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having one of the following structures: ##STR00001##

An organometallic compound is represented by Formula 1. An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; an organic layer between the first electrode and the second electrode and comprising an emission layer; and the organometallic compound represented by Formula 1. In Formula 1, each substituent is the same as described herein.

##STR00001##

An organometallic compound represented by Formula 1, wherein M.sub.1 is beryllium, magnesium, aluminum, calcium, titanium, manganese, cobalt, copper, zinc, gallium, germanium, zirconium, ruthenium, rhodium, palladium, silver, rhenium, platinum, or gold; A.sub.1 to A.sub.3 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C1-C30 heterocyclic group; A.sub.4 is a 5-membered heterocyclic group; A.sub.5 is at least two rings of a C.sub.7-C.sub.30 carbocyclic group comprising a 6-membered carbocyclic group, or A.sub.5 is at least two rings of a C.sub.1-C.sub.30 heterocyclic group comprising a 6-membered carbocyclic group or a 6-membered heterocyclic group; X.sub.10, X.sub.20, X.sub.30, and X.sub.40 to X.sub.44 are each independently C or N; T.sub.1 to T.sub.3 are each independently a single bond, *N[(L.sub.1).sub.a1-(R.sub.1).sub.b1]*, *B(R.sub.1)*, *P(R.sub.1)*, *C(R.sub.1)(R.sub.2)*, *Si(R.sub.1)(R.sub.2)*, *Ge(R.sub.1)(R.sub.2)*, *S*, *Se*, *O*, *C(O)*, *S(O)*, *S(O).sub.2*, *C(R.sub.1)C(R.sub.2)*, *C(S)*, or *CC*; and wherein the other substituents may be understood by referring to the detailed description.

##STR00001##

A compound, Ir(L.sub.A).sub.2(L.sub.C), having a structure of Formula I,

##STR00001##

where two adjacent ones of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 are C and are joined to a structure of Formula II,

##STR00002##

by the dashed lines is provided. In Formulas I and II, each of X.sup.1 to X.sup.4 is C or N; moiety B is a monocyclic ring or a fused ring system; Z is C or N; Y is CRR, SiRR, GeRR, BR, or BRR; R* is hydrogen or deuterium; each R, R, R.sup.A, R.sup.B, R.sup.1, R.sup.2, and R.sup.3 is hydrogen or a General Substituent; R.sup.C is selected from a variety of substituents; and any two substituents can be joined or fused to form a ring. Formulations, OLEDS, and consumer products including the compound are also provided.