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 method of sputter deposition onto an organic material, wherein the discharge gas of the sputtering operation is a gas having a spectrum of light emission of a lower energy than that of argon.

Abstract: A method of forming an electroluminescent device, including the steps of forming a first charge carrier injecting layer for injecting charge carriers of a first polarity, forming an organic charge carrier transport layer over the first charge carrier injecting layer, the transport layer having an electronic and/or optical property which varies across the thickness of the transport layer, forming an organic light emissive layer over the transport layer, and forming a second charge carrier injecting layer over the light emissive layer for injecting charge carriers of a second polarity.

Abstract: An electroluminescent device comprising: a first charge-carrier injecting layer for injecting positive charge carriers and a second charge-carrier injecting layer for injecting negative charge carriers, at least one of the charge-carrier injecting layers being patterned so as to comprise spaced-apart charge-injecting regions; an organic light-emitting layer located between the first and second charge-carrier injecting layers; and an unpatterned conductive polymer layer located between the organic light-emitting layer and the patterned charge-carrier injecting layer, the resistivity of the conductive polymer layer being sufficiently low to allow charge carriers to flow through it from the charge-injecting regions to generate light in the organic light-emitting layer but sufficiently high to resist lateral spreading of charge carriers beyond the charge-injecting regions.

Abstract: An organic light-emitting device, comprising: a substrate (1); a first conductive layer (3) formed over the substrate (1); at least one layer (5) of a light-emissive organic material formed over the first conductive layer (3); a barrier layer (7) formed over the at least one organic layer (5) which acts to protect the at least one layer of organic material; and a second conductive layer (9), preferably a patterned sputtered layer, formed over the barrier layer (7).

Abstract: A process for preparing a conjugated polymer, which comprises polymerizing in a reaction mixture (a) an aromatic monomer having at least two reactive boron derivative groups selected from a boronic acid group, a boronic ester group and a borane group, and an aromatic monomer having at least two reactive halide functional groups; or (b) an aromatic monomer having one reactive halide functional group and one reactive boron derivative group selected from a boronic acid group, a boronic ester group and a borane group, wherein the reaction mixture comprises a catalytic amount of a palladium catalyst, and an organic base in an amount sufficient to convert the reactive boron derivative groups into -B(OH)3- anions.

Abstract: An organic light-emitting device comprising a transparent cover sheet; a region of organic light-emitting material behind the cover sheet; a region of circuitry behind the cover sheet for regulating the flow of current to the organic light-emitting material; and a non-light-transmissive layer which lies between the cover sheet and the circuitry.

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.

Abstract: A method for forming a display device, comprising: depositing a thin-film transistor switch circuit on a substrate; depositing by ink-jet printing an electrode layer of light transmissive conductive organic material in electrical contact with the output of the thin-film transistor circuit; and depositing an active region of the device over the electrode layer.

Abstract: There is disclosed an organic light-emitting device having at least one layer of light-emissive organic material arranged between first and second electrodes, one of the first and second electrodes being a multilayer structure, each layer of the multilayer structure being a DC magnetron sputtered layer. There is also disclosed an organic light-emitting device having two or more layers of light-emissive organic material arranged between first and second electrodes, an upper most layer of the organic material being more resistant to sputter deposition than an underlying layer of the organic material, and the electrode formed over the upper most layer of organic material being a sputtered layer. There is also disclosed methods for making such structures.

Abstract: There is disclosed an organic light-emitting device having at least one layer of light-emissive organic material arranged between first and second electrodes, one of the first and second electrodes being a multilayer structure, each layer of the multilayer structure being a DC magnetron sputtered layer. There is also disclosed an organic light-emitting device having two or more layers of light-emissive organic material arranged between first and second electrodes, an upper most layer of the organic material being more resistant to sputter deposition than an underlying layer of the organic material, and the electrode formed over the upper most layer of organic material being a sputtered layer. There is also disclosed methods for making such structures.

Abstract: An organic light-emitting device having an organic light-emitting region comprising a plurality of organic light-emitting pixels; switch means each associated with a respective pixel for switching power to that pixel; and drive means for driving each switch means to cycle between a first, low power mode and a second, high power mode, at a frequency sufficient to cause light emission from the associated pixel to appeal substantially continuous, the duration of the highpower mode relative to the low power mode being variable so as to vary the average brightness of the pixel.

Abstract: A process for the preparation of a conjugated poly(arylene vinylene) copolymer for use in a luminescent device, which comprises: (1) providing a precursor polymer comprising units of general formula in which Ar is substituted or unsubstituted arylene, L is a leaving group, R1 and R2 are each independently H, alkyl, alkoxy, aryl or an electron-withdrawing group, and n is an integer; (2) reacting the precursor polymer with a reactant comprising a carboxylate, an aldehyde, a ketone, a sulphonate, a thioate, a disulphide, a xanthate, an amine, a pyridine, a hydrazide, a phenoxide, an alcohol with a boiling point above 100° C.

Abstract: An electroluminescent device comprising: a first charge-carrier injecting layer for injecting positive charge carriers and a second charge-carrier injecting layer for injecting negative charge carriers, at least one of the charge-carrier injecting layers being patterned so as to comprise spaced-apart charge-injecting regions; an organic light-emitting layer located between the first and second charge-carrier injecting layers; and an unpatterned conductive polymer layer located between the organic light-emitting layer and the patterned charge-carrier injecting layer, the resistivity of the conductive polymer layer being sufficiently low to allow charge carriers to flow through it from the charge-injecting regions to generate light in the organic light-emitting layer but sufficiently high to resist lateral spreading of charge carriers beyond the charge-injecting regions.

Abstract: There is disclosed an organic light-emitting device having at least one layer of light-emissive organic material arranged between first and second electrodes, one of the first and second electrodes being a multilayer structure, each layer of the multilayer structure being a DC magnetron sputtered layer. There is also disclosed an organic light-emitting device having two or more layers of light-emissive organic material arranged between first and second electrodes, an uppermost layer of the organic material being more resistant to sputter deposition than an underlying layer of the organic material, and the electrode formed over the uppermost layer of organic material being a sputtered layer. There are also disclosed methods for making such structures.

Abstract: A multi-color electroluminescent display has a plurality of discrete, laterally spaced areas of light emitting material formed over respective groups of first and second electrode regions. The light emissive material over each group is capable of emitting radiation of a different color. The multi-colored device is formed by a sequence of steps where each emitting layer is deposited as. a precursor which is susceptible to patterning and which is then converted into its polymer which is not susceptible to subsequent patterning steps. This allows a second color to be deposited on top of a first color, the second color being patterned while avoiding damage to the first color below it.

Abstract: An electroluminescent device comprising: a first charge-carrier injecting layer for injecting positive charge-carriers; a second charge-carrier injecting layer for injecting negative charge-carriers; a layer of a first organic material located between the charge-carrier injecting layers; and located between the layer of a first organic material and one of the charge-carrier injecting layers: a first light-emissive region comprising a light-emissive second organic material having an energy-gap less than that of the first organic material; and a second light-emissive region comprising a first component of a light-emissive third organic material having an energy-gap greater than that of the first organic material, and a second component having at least one energy level off-set from that of the first component; such that when charge-carriers are injected in the first region by the charge-carrier injecting layers light is emitted principally from the second organic material and when charge-carriers are injected in

Abstract: A process for preparing a conjugated polymer, which comprises polymerizing in a reaction mixture (a) an aromatic monomer having at least two reactive boron derivative groups selected from a boronic acid group, a boronic ester group and a borane group, and an aromatic monomer having at least two reactive halide functional groups; or (b) an aromatic monomer having one reactive halide functional group and one reactive boron derivative group selected from a boronic acid group, a boronic ester group and a borane group, wherein the reaction mixture comprises a catalytic amount of a palladium catalyst, and an organic base in an amount sufficient to convert the reactive boron derivative groups into —B(OH)3− anions.