Provided is an organic electroluminescent element which has improved driving voltage and improved current efficiency. An organic electroluminescent element having the above-mentioned improved characteristics is provided by using, as a material for organic electroluminescent elements, a polycyclic aromatic compound in which a nitrogen atom and another heteroatom or a metal atom (X) are adjacent to each other in a non-aromatic ring.

The present invention includes novel borazarophenanthrene compounds, which may be used as hosts for phosphorescent emitters, charge transporters or emitters in OLEDs.

Provided are a polycyclic compound and an organic electroluminescence device including the same. The polycyclic compound according to an exemplary embodiment of the present disclosure is represented by the following formula 1.

##STR00001##

In Formula 1, X is O, SiRR, S, or BAr.sub.1. At least one of R.sub.1 to R.sub.8 is an aryl amine-containing electron donor. When X is O, SiRR, or S, the aryl amine-containing electron donor further includes a Si.

The present invention relates to the use of aromatic boronic acid or borinic acid derivatives in organic electronic devices, in particular electroluminescent devices.

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

##STR00001##

is provided, where: each of moiety A and moiety B is a monocyclic ring or a polycyclic fused ring system; each of X.sup.1 to X.sup.4 and Z.sup.1 and Z.sup.2 is C or N; K.sup.1 and K.sup.2 are each a direct bond or a linker; L.sup.1 is a direct bond or an organic linker; each R.sup., R.sup., R.sup.A and R.sup.B is hydrogen or a General Substituent defined herein; and at least one R.sup.A or one R.sup.B comprises R*, where R* is an alkyl group, a silyl group, a germyl group, or a combination thereof. Formulations, OLEDs, and consumer products containing the compound are also provided.

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

##STR00001##

is provided. In Formula I, moiety A is a monocyclic ring or a polycyclic fused ring system, moiety B is a polycyclic fused ring system; each of Z.sup.1 to Z.sup.4 is C or N; each of K.sup.1 and K.sup.2 is a direct bond or a linker; at least one R.sup.B or R.sup.A comprises,

##STR00002##

where T is B, C, N, Si, Ge, Bi, or P; V is a direct bond or a linker; R.sub.1 and R.sub.2 are present, and R.sub.3 is optionally present; each substituent is independently hydrogen or a General Substituent defined herein; and at least two of R.sub.1, R.sub.2, and R.sub.3 has two or more carbon atoms. Formulations, OLEDs, and consumer products containing the compound are also provided.

Provided are organometallic compounds which comprise a ligand comprising a 6-membered aromatic carbocyclic or heterocyclic ring which is bond via a direct bond to a moiety which is a monocyclic 5-membered or 6-membered carbocyclic or heterocyclic ring or a polycyclic fused ring system comprising two or more 5-membered or 6-membered carbocyclic or heterocyclic rings. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.

The present invention relates to light-emitting materials for light-emitting diodes. The structure for the light-emitting materials is shown in Formula I. The platinum (II) complexes of the present invention show high emission quantum efficiency, good thermal stability and low quenching constant, thus can be used for producing red light OLED with high efficiency and low efficiency attenuation. ##STR00001##

The present invention relates to light-emitting materials for light-emitting diodes. The structure for the light-emitting materials is shown in Formula I. The platinum (II) complexes of the present invention show high emission quantum efficiency, good thermal stability and low quenching constant, thus can be used for producing red light OLED with high efficiency and low efficiency attenuation.

##STR00001##

Novel organic compounds comprising a boron-nitrogen heterocycle are provided. In particular, the compound contains an azaborine. The compounds may be used in organic light emitting devices to provide devices having improved photophysical and electronic properties.