A metal complex having at least one chelating N-heterocyclic carbene ligand. The metal complex provides a blue emission. This is useful for organic light emitting diode (OLED) components where blue emitters have trailed behind the advances of red and green emitters.

Metal complexes with ligands bearing a five member aromatic moiety fused with dibenzofuran or its analogues useful as electroluminescence materials in OLEDs are disclosed.

A ligand for metal complexes are disclosed, in which an imidazole ring is fused to an aromatic ring as a substituent or an imidazole ring is fused to a six-member ring of the original ligand. The features of these elements within the ligand afford a better device performance in general OLED device.

A compound including a first ligand L.sub.A of Formula I ##STR00001##
is disclosed. In the structure of Formula I, one of L.sup.1 and L.sup.2 is C, and the other is N; Y.sup.1 to Y.sup.14 are each C or N; at least two adjacent Y.sup.7, Y.sup.8, Y.sup.9, and Y.sup.10 are carbon atoms that are fused to a structure of Formula II ##STR00002##
Z.sup.1 and Z.sup.2 are each O, S, Se, NR, CRR′, or SiRR′; and each R, R′, R.sup.A, R.sup.B, R.sup.C, and R.sup.D is 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 L.sup.1 and L.sup.2, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

A heterocyclic compound represented by Formula 1, a composition including the same, and an organic light-emitting device including the heterocyclic compound: ##STR00001## L.sub.1 to L.sub.4, L.sub.11, a1 to a4, a11, Ar.sub.1, Ar.sub.2, Ar.sub.11, R.sub.1 to R.sub.7, R.sub.11 to R.sub.12, b1 to b7, and b11 to b12 are described in the specification.

An organic molecule is disclosed herein having a structure of formula I: ##STR00001##
wherein
n=0 or 1 at each occurrence,
m=1-n at each occurrence; i.e. if n is 1, m is 0 and vice versa,
o=0 or 1 at each occurrence, and
p=1-o at each occurrence;
T is selected from the group consisting of a direct bond, NR.sup.3, Si(R.sup.3).sub.2, C(R.sup.3).sub.2, BR.sup.3, O, S, S(O) and S(O).sub.2.
V is selected from the group consisting of a direct bond, NR.sup.3, Si(R.sup.3).sub.2, C(R.sup.3).sub.2, BR.sup.3, O, S, S(O) and S(O).sub.2.
Z is at each occurrence independently form another selected from the group consisting of a direct bond, CR.sup.3R.sup.4, C═CR.sup.3R.sup.4, C═O, C═NR.sup.3, O, SiR.sup.3R.sup.4, S, S(O) and S(O).sub.2.

An organic electroluminescence device in which a polycyclic compound including an electron donor and an electron acceptor is included in an emission layer is provided. The electron donor contains an acridine derivative or a dibenzo-azasiline derivative, and the electron acceptor contains B as a ring-forming atom, O or S directly bonded to B, and a heterocyclic group in which three or five hexagonal rings are condensed. Accordingly, an organic electroluminescence device having high efficiency may be achieved.

The present invention relates to an organic electroluminescent device comprising a benzothiazine derivative and it also relates to specific benzothiazine derivatives.

A compound having structures represented by the following formulas (1) or (2): wherein in the formulas (1) and (2), at least one of R.sub.1 to R.sub.8 is a deuterium atom.

##STR00001##

The present invention relates to the preparation and application of an O∧C∧N∧N tetradentate platinum (II) complex. The complex of the present invention has a structure as shown in Formula (I) below. Compared with a reference device, the organic light-emitting device prepared by the present invention has better performance improvement, and the novel O∧C∧N∧N tetradentate platinum (II) complex has great application value. The tetradentate platinum (II) complex involved in the present invention is based on a carbazole framework, and has a large π-conjugated rigid planar structure, which can greatly reduce non-radiative energy dissipation such as intramolecular rotation and vibration, and is conducive to improving the luminous efficiency and performance of the platinum (II) complex. The O∧C∧N∧N tetradentate platinum (II) complex metal organic material prepared by the present invention has great application values in organic light-emitting diodes, and is used as a phosphorescent doping material to produce a red light OLED device with high luminous efficiency.

##STR00001##