Abstract: An electroluminescent device comprising: an organic light-emissive layer; an electrode on one side of the light-emissive layer for injecting charge carriers of a first polarity towards the light-emissive layer; and a light filtering layer on the other side of the light-emissive layer, the light filtering layer comprising an organic material that is doped to render it at least partially electrically conductive for injection of charge carriers of a second type towards the light-emissive layer.

Abstract: Provided is a method of fabricating an organic light-emitting device; which method comprises the steps of: forming a first electrode (4) for the device over a substrate (2); either forming by self-assembly at least one polymer layer (6, 8) over the first electrode (4) and forming other than by self-assembly at least one layer of organic light emissive material (10) over the at least one polymer layer (6, 8); and forming a second electrode (12) for the device over the at least one layer of organic light emissive material (10); or forming other than by self-assembly at least one layer of organic light emissive material over the first electrode and forming by self-assembly at least one polymer layer over the at least one layer of organic light emissive material; and forming a second electrode for the device over the at least one polymer layer. Also provided is an organic light emitting device, obtainable according to the method of the present invention.

Abstract: A method for forming a conjugated polymer which is doped by a dopant includes the steps of (a) adding a doping agent comprising a dopant moiety to a solution containing the conjugated polymer or a precursor thereof and, optionally, a second polymer, the dopant moiety being capable of bonding to the conjugated polymer, precursor thereof or the second polymer; (b) allowing the dopant moiety to bond to the conjugated polymer, precursor thereof or the second polymer to perform doping of the conjugated polymer, wherein the amount of doping agent added in step (a) is less than the amount required to form a fully doped conjugated polymer.

Abstract: A method for forming a conjugated polymer which is doped by a dopant includes the steps of (a) adding a doping agent comprising a dopant moiety to a solution containing the conjugated polymer or a precursor thereof and, optionally, a second polymer, the dopant moiety being capable of bonding to the conjugated polymer, precursor thereof or the second polymer; (b) allowing the dopant moiety to bond to the conjugated polymer, precursor thereof or the second polymer to perform doping of the conjugated polymer, wherein the amount of doping agent added in step (a) is less than the amount required to form a fully doped conjugated polymer.

Abstract: A light-emitting device comprising: a first electroluminescent element for emitting light of a first colour when energised; and a second electroluminescent element for emitting light of a second colour when energised, the first electroluminescent element having an active lifetime which is greater than that of the second electroluminescent element; characterised in that the second element is configured to operate at a lower brightness than the first element.

Abstract: An opto-electrical device comprising an anode electrode, a cathode electrode, and an opto-electrically active region located between the electrodes, the cathode electrode including a first layer comprising a compound of a group 1 metal, group 2 metal, or a transition metal, a second layer comprising a material having a work function below 3.5 eV, and a third layer spaced from the opto-electrically active region by the first and second layers and having a work function above 3.5 eV.

Abstract: A multiple wavelength light emitting device is provided wherewith the resonance strength and directivity between colors can be easily adjusted for balance. This light emitting device comprises a light emission means 4 for emitting light containing wavelength components to be output, and a semi-reflecting layer group 2 wherein semi-reflecting layers 2R, 2G, and 2B that transmit some light having specific wavelengths emitted from the light emission means and reflect the remainder are stacked up in order in the direction of light advance in association with wavelengths of light to be output. Light emission regions AR, AG, and AB are determined in association with the wavelengths of light to be output.

Abstract: An opto-electrical device comprising an anode electrode, a cathode electrode, and an opto-electrically active region located between the electrodes, the cathode electrode including a first layer comprising a material having a work function below 3.5 eV, a second layer of a different composition from the first layer, comprising another material having a work function below 3.5 eV, the second layer being further from the opto-electrically active region than the first layer, and a third layer comprising a material having a work function above 3.5 eV, the third layer being further from the opto-electrically active region than the first layer.

Abstract: The present invention provides formulations which facilitate the direct deposition of patterned polymer films. In particular, the present invention provides a formulation with which polymer films which exhibit improved emission can be uniformly deposited, particularly in the context of relatively high molecular weight polymers with intrinsically rigid conjugated systems. By way of example, a formulation comprising a conjugated polymer dissolved in a solvent comprising at least one substance selected from the group consisting of terpenes and polyalkylated aromatic compounds are demonstrated.

Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.

Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.

Abstract: An opto-electrical device comprising an anode electrode, a cathode electrode, and an opto-electrically active region located between the electrodes, the cathode electrode including a first layer comprising a compound of a group 1, group 2 or transition metal, a second layer comprising a material having a work function below 3.5 eV, and a third layer spaced from the opto-electrically active region by the first and second layers and having a work function above 3.5 eV.

Abstract: A display device comprising an array of light-emissive pixels, each pixel comprising red, green and blue light emitters and at least one further light emitter for emitting a color to which the human eye is more sensitive than the emission color of at least one of the red and blue emitters.

Abstract: An efficient multiple-wavelength light emitting device is provided. This multiple-wavelength light emitting device comprises a light emitting layer 4 for emitting light containing wavelength components to be output, a negative electrode 5 that is positioned at the back surface of the light emitting layer and that transmits at least a portion of the light, reflecting layers 7R, 7G, and 7B, positioned at the back surface of the negative electrode, for reflecting, of the light emitted through the negative electrode to the back surface, light having specific wavelengths, which reflecting layers are stacked up in order perpendicularly to the light axis, in correspondence with the wavelengths of the light to be reflected, thus configuring a reflecting layer group 7. In the direction perpendicular to the light axis, divisions are made in any of at least two or more light emission regions which reflect light of different wavelengths.

Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.

Abstract: A method of manufacturing an electroluminescent device which has an anode (4) and a cathode (10) and arranged between the anode (4) and the cathode (10) a light emissive layer (8), also includes an anode protection layer (6) which protects the anode (10) against the effects of converting a precursor polymer to a semiconductive conjugated polymer which constitutes the light emissive layer (8). This has been found to increase the brightness and half-life of devices.

Abstract: A display device comprising: a light-emissive structure including two regions of light emissive material for emitting light in a viewing direction, the regions being spaced apart in a direction perpendicular to the viewing direction the light-emissive structure being capable of guiding light emitted from one of the light-emissive regions towards the other emissive region; and a barrier structure located between the light-emissive regions for inhibiting the propagation of light guided from the said one of the light-emissive regions to the other light-emissive region.

Abstract: A method of reducing black spots in a light-emitting device comprising a light-emissive material interposed between a first electrode and a second electrode such that the first and second electrodes are capable of injecting charge carriers into the light-emissive organic material, the method comprising: forming at least one of the first and second electrodes by depositing onto the light-emissive organic material a first layer of a material by a deposition technique which intrinsically results in undesirable pin-holes; and depositing a second layer of a material onto the first layer by a conformable deposition technique.

Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.

Abstract: A polymer which comprises triarylamine units, which polymer comprises one or more structural units comprising Arh-NAr2, where Arh comprises a substituted or unsubstituted heteroaryl group and each Ar is the same or different and comprises a substituted or unsubstituted aryl or heteroaryl group and excluding the copolymer where the polymer backbone contains one or more divinylenearylene units.