Abstract: Emissive phosphorescent organometallic compounds are described that produce improved electroluminescence, particularly in the blue region of the visible spectrum. Organic light emitting devices employing such emissive phosphorescent organometallic compounds are also described. Also described is an organic light emitting layer including a host material having a lowest triplet excited state having a decay rate of less than about 1 per second; a guest material dispersed in the host material, the guest material having a lowest triplet excited state having a radiative decay rate of greater than about 1×105 or about 1×106 per second and wherein the energy level of the lowest triplet excited state of the host material is lower than the energy level of the lowest triplet excited state of the guest material.

Abstract: An organometallic complex that increases an energy band gap between HOMO and triplet MLCT states, and enables highly efficient phospholuminescence and can be used for an organic electroluminescent device. The organometallic complex, which is suitably used for forming an organic layer of the organic electroluminescent device, provides a luminescence maximum emission in the wavelength range of 400-650 nm, and induces white electroluminescence when combined with green or red luminescent materials.

Abstract: A organic electroluminescent element is disclosed which comprises a light emission layer containing a fluorescent compound and a phosphorescent compound, the fluorescent compound having a nitrogen atom number to carbon atom number ratio in the molecule (N/C) of from 0 to 0.05, wherein the maximum emission wavelength of light emitted according to electroluminescence of the element is longer than the maximum fluorescence wavelength of the Fluorescent compound.

Abstract: There is provided a high light-emission-efficiency, highly stable, low-cost light emitting device that utilizes a copper complex as a light emitting material and comprises a pair of electrodes provided on a substrate, and an organic substance layer provided between the electrode and comprising a metal coordination compound having a partial structure represented by the general formula (1): wherein Cu represents a copper ion.

Abstract: A compound having a diphenylanthracene structure at the center and a specific structure substituted with an aryl group at end portions. An organic electroluminescence device comprises a plurality of layers of thin films of organic compounds which comprise a light emitting layer or a plurality of layers comprising a light emitting layer and are disposed between a pair of electrodes and at least one of the layers of thin films of organic compounds comprises the above compound. The compound exhibits excellent efficiency of light emission and heat resistance, has a long life and emits bluish light having excellent purity of color and the organic electroluminescence device comprises the compound and exhibits the same advantageous properties.

Abstract: An organic electroluminescence device capable of solving the problem of realization of low-voltage driving and high luminance which is important for the prolongation of the life thereof, the organic electroluminescence device comprising a luminous layer composed of a single or a plurality of organic compound thin films interposed between a positive electrode and a negative electrode, characterized in that at least one layer containing a compound having carbenium ion is arranged therein; and a charge transport material (e.g., hole transport material for the organic electroluminescence device) characterized in that a compound having carbenium ion is contained therein.

Abstract: An electroluminescent device has, as the electroluminescent layer, a metal compound selected from organic complexes of non rare earth metals.

Abstract: An electroluminescence device having a layer containing a specific metal coordination compound is provided. The metal coordination compound is represented by formula (1) below: MLmL?n,??(1) wherein M is a metal atom of Ir, Pt, Rh or Pd; L and L? are mutually different bidentate ligands; m is 1, 2 or 3 and n is 0, 1 or 2 with the proviso that m+n is 2 or 3; a partial structure MLm is represented by formula (2) shown below and a partial structure ML?n is represented by formula (3) or (4) shown below: The metal coordination compound of the formula (1) is characterized by having at least one aromatic substituent for at least one of CyN1, CyN2, CyC1 and CyC2. The metal coordination compound having the aromatic substituent is effective in providing high-efficiency luminescence, long-term high luminance, and less deterioration by current passing.

Abstract: The present invention is to provide quinoxaline derivatives, which have excellent electron transportation and hole blocking properties, and which can be formed into a film without being crystallized. According to the invention, quinoxaline derivatives represented by the general [formula 1] are synthesized. (wherein X and Y represent a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, and R1 to R6 represent individually hydrogen, an alkyl group, an alkoxyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group. Further, an organic semiconductor device including an electroluminescent device containing the foregoing quinoxaline derivatives is formed.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains a phosphorescent material and a compound represented by the formula (I) as defined herein.

Abstract: An organic light emitting device is provided, having an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer may include the following compound: wherein M is a metal having an atomic weight greater than 40; (C—N) is a substituted or unsubstituted cyclometallated ligand, and (C—N) is different from at least one other ligand attached to the metal; each R is independently selected from hydrogen, alkyl, alkenyl, alkynyl, alkylaryl, CN, CF3, CO2R, C(O)R, NR2, NO2, OR, halo, aryl, heteroaryl, substituted aryl, substituted heteroaryl, or a heterocyclic group. The emissive layer may also include a compound having a metal bonded to at least two ligands, in which one ligand has a triplet energy corresponding to a wavelength that is at least 80 nm greater than the wavelength corresponding to the triplet energy of other ligands. Each ligand may be organometallic.

Abstract: A blue phosphorescent compound and an organic electroluminescent device using the same are provided. The blue phosphorescent compound can emit deep blue light and can improve color purity and reduce power consumption when used in an organic electroluminescent device.

Abstract: An organic light emitting device is provided. The device has an anode, a cathode, and an organic layer disposed between the anode and the cathode. The organic layer comprises an emissive material having a transition metal and two or three bidentate ligands, which may be photoactive ligands. The bidentate photoactive ligands may be bound to the transition metal through a carbon-metal bond and a nitrogen-metal bond to form a cyclometallated ring. The organic layer may have the formula LXa-(L)bM, wherein X is a linking group that links two or more ligand L and M is a metal.

Abstract: The present invention is generally directed to electroluminescent Pt(II) complexes which have emission maxima across the visible spectrum, and devices that are made with the Pt(II) complexes.

Abstract: A phosphorescent Ir complex having the following structures (I) or (II) is used as an emitter in an organic light emitting diode (OLED): wherein X is an arbitrary monoanionic bidentate ligand; Z is an arbitrary moiety constituting a nitrogen-containing heterocyclic group; R1 is a substituent on the nitrogen-containing heterocyclic group; m is 0 or a positive integer; R2 and R3 independently are H, halogen, C1-C6 alkyl, a halogen-substituted C1-C6 alkyl, C1-C6 alkoxy, phenyl C1-C6 alkyl, amino, aryl, heterocyclic aryl substituent.

Abstract: An organometallic complex, comprises at least one transition metal, at least one first monoanionic bidentate ligand coordinated through a nitrogen on a heteroaromatic ring and a carbon, and at least one second ligand selected from a hydride and a ligand coordinated through a carbon atom which is part of an aromatic group. Methods for making the complex and its uses in electronic devices are also presented.

Abstract: An electroluminescent element is disclosed, comprising an electroluminescent material and a fluorescent substance emitting light having an emission maximum at the wavelength different from that of light emitted from the electroluminescent material upon absorption of the light emitted from the electroluminescent material. A color conversion filter is also disclosed, comprising a fluorescent substance emitting light having an emission maximum at the wavelengths of 400 to 700 nm upon absorption of the light emitted from the electroluminescent material.

Abstract: A light-emitting element having excellent light-emitting properties and with which it is possible to emit blue light at a high luminance for a long period of time, and an iridium complex for realizing the same. The light-emitting element has an external quantum efficiency of at least 5% and a light emission maximum wavelength ?max of no more than 500 nm. Further, there is provided a light-emitting element including a light-emitting layer or a plurality of organic compound layers having the light-emitting layer, with at least one of the compound layers including at least one kind of a compound having a partial structure represented by the general formula K-0.

Abstract: Provided are binuclear organometallic complexes enabling highly efficient phospholuminescence and an organic electroluminescent device using the same. The binuclear organometallic complexes, which are suitably used for forming an organic layer of the organic electroluminescent device, provides maximum luminescence emission in the wavelength range of 400-650 nm, and induces white electroluminescence when combined with green or red luminescent materials.

Abstract: An organic electroluminescent element comprising: a pair of electrodes; and at least one organic layer provided between the pair of electrodes, at least one of the at least one organic layer being a light emitting layer, wherein the light emitting layer comprises at least one transition metal complex represented by the formula (1), (2), (3), (4) or (5) as defined herein or an iridium complex represented by the formula (A), (6), (7) or (8) as defined herein.