Abstract: Embodiments of electroluminescent devices of the invention are preferably formed of a transparent anode; a layer of a hole transporting material; a layer of an electroluminescent material; a layer of an electron transporting material; a layer of lithium quinolate or of a substituted lithium quinolate e.g. of thickness less than 7 nm; and a metal cathode. The layer of the metal quinolate is preferably about 0.3-0.5 nm in thickness.

Abstract: An improved electroluminescent device has a layer of a first electroluminescent metal complex or organo metallic complex and a layer of a second metal complex or organo metallic complex in which the band gap of the metal in the second electroluminescent metal complex or organo metallic complex is larger than the band gap of the metal in the first electroluminescent metal complex or organo metallic complex.

Abstract: A method producing authenticatable documents by incorporating a fluorescent organometallic complex in the toner or in the paper in which the fluorescent organometallic complex gives off light with a characteristic spectrum when exposed to UV light.

Abstract: An electroluminescent material is a metal complex of 1-phenyl-3-methyl-4-trimethylacetyl-pyrazol-5-one of formula (I). An electroluminescent device comprising the compound of formula (I) in the luminescent layer is also part of the invention.

Abstract: In OLEDs, improved efficiency is obtained by using compounds of formula [Ar](CH?CH—R1)n wherein n is an integer from 1 to 4; [Ar] is a polycyclic aromatic or heteroaromatic scaffold optionally substituted with one or more alkyl or alkoxy groups; and R1 is a 5-membered heteroaryl group optionally substituted with methyl, methoxy, aryl or heteroaryl, or is phenyl or naphthyl optionally substituted with methyl, methoxy, trifluoromethyl or cyano or is biphenyl or substituted biphenyl. The compounds are believed to be novel and can be made by condensing a compound of formula wherein [Ar] and n are as defined above with a compound of formula [Ar](CH3)nR1CHO in the presence of an acid catalyst e.g. an anhydride of an organic acid.

Abstract: The invention relates to an optical light emitting diode device having an electroluminescent layer and an electron transport layer, wherein the electron transport layer contains zirconium or hafnium quinolate for slowing loss of luminance at a given current density with increase of the time for which the device has been operative. The invention also relates to OLEDs, improved efficiency and/or lifetime is obtained by using zirconium or hafnium quino late as electron transport material.

Abstract: Novel ruthenium, rhodium, palladium, osmium, iridium or platinum complexes of thianthrene ligands are electroluminescent compounds. According to the invention there is provided complexes of Formula (I).

Abstract: Lithium quinolate is an electroluminescent material which emits light in the blue region of the spectrum.

Abstract: In an OLED there is a reflectivity influencing layer (27) which is preferably semi-absorbent and in embodiments is dark coloured or black which is formed of a sublimable organometallic compound. The reflectivity influencing layer is formed between an electrode (29 or 22) and a light-emitting layer (25).

Abstract: An OLED with an inorganic p-type semiconductor hole transporting layer and an inorganic n-type semiconductor electron transporting layer.

Abstract: Novel iridium complexes are electroluminescent.

Abstract: Novel boron complexes are blue emissive electroluminescent compounds.

Abstract: Lithium quinolate is a host material for organometallic electroluminescent materials to form an electroluminescent layer in an electroluminescent device.

Abstract: Electroluminescent devices with an improved buffer layer on the anode, wherein the buffer material is selected from metal tetra-p-tolyl porphonato complexes, and bianthryl compounds of Formula (I) or (II).

Abstract: A method of spin coating electroluminescent organo metallic by coating the anode with a polymer before spin coating.

Abstract: A hole transporting or hole conducting material for use in electroluminescent devices is a diamino dianthracene.

Abstract: An electroluminescent material is a complex of boron and a beta diketone.

Abstract: An electroluminescent compound is a diarylamine anthracene compound.

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

Abstract: An electroluminescent device which has an electroluminescent layer formed of a binuclear, trinuclear or polynuclear rare earth organic complex in which the metals are linked through a bridging ligand.