Abstract: An organic light-emitting device comprising an anode (103); a cathode (111); a light-emitting layer (109) comprising a first light-emitting material between the anode and the cathode; a first hole-transporting layer (105) comprising a first hole-transporting material between the anode and the light-emitting layer; and a second hole-transporting layer (107) comprising a second hole-transporting material between the first hole-transporting layer and the light-emitting layer, wherein a HOMO level of the first light-emitting material is closer to vacuum than a HOMO level of at least one of the first and second hole-transporting materials.

Abstract: A white light emitting device having an anode and a cathode and therebetween an organic electroluminescent layer which emits white light on the provision of a current between the anode and the cathode, said organic electroluminescent layer including a plurality of electroluminescent zones in laterally separated arrangement, the first of said electroluminescent zones including a first polymer and the second of said electroluminescent zones including a second polymer, wherein the first polymer includes a fluorescent blue light emitting species and the second polymer includes a fluorescent green light emitting species, said first and/or second zones further including a phosphorescent red light emitting species, such that together with the blue emitting species results in the emission of white light, said first and second polymers being physically incompatible so that separation of the zones pertains.

Abstract: A polymer, for use in an organic light emitting device, comprises asymmetrically substituted repeat units of formula (I (a)): wherein R7 represents a substituent bound to the 9-carbon atom of the fluorene ring through a non-aromatic carbon atom, R8, R9 and R11 independently in each occurrence represent H or a substituent with the proviso that at least one R8 is not H; R10 independently in each occurrence is a substituent; and t in each occurrence is independently 0, 1, 2 or 3. R7 is preferably a linear alkyl substituted with one or more groups —(Ar6)w, wherein each Ar6 independently represents an optionally substituted aryl or heteroaryl group, and w is at least 1, for example 1, 2 or 3.

Abstract: A method of forming a layer of an electronic device, for example an organic light-emitting device, the method comprising the step of depositing a precursor layer comprising a compound of formula (I) and reacting the compound of formula (I) in a ring-opening addition reaction: Core-(Reactive Group)n??(I) wherein Core is a non-polymeric core group; and each Reactive Group, which may be the same or different in each occurrence, is a group of formula (II): wherein Sp1 independently in each occurrence represents a spacer group; w independently in each occurrence is 0 or 1; Ar in each occurrence independently represents an aryl or heteroaryl group; R1 in each occurrence independently represents H or a substituent, with the proviso that at least one R1 is a substituent; n is at least 1; and * is a point of attachment of the group of formula (II) to the Core; and wherein the compound of formula (I) reacts with itself or with a non-polymeric co-reactant.

Abstract: A blend for preparing a semiconducting layer an organic electronic device comprises a polymer, a first non-polymeric semiconductor, a second non-polymeric semiconductor and a third non-polymeric semiconductor. The blend enables higher concentration solutions of semiconductor and a broader solution processing window as compared to blends comprising one polymer and one non-polymeric semiconductor. For example, a blend comprising F8-TFB and three different substituted benzothiophene derivatives shows three-fold higher average saturation mobility in OTFTs as compared to a blend of one polymer and one of these benzo thiophene derivatives and consistent peak saturation mobilities after drying at 60° C., 80° C. and 100° C. even after a 2 minute delay.

Abstract: A co-polymer comprising a repeat unit of formula (I): wherein Ar1, Ar2 and Ar3 each independently represent an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents, the copolymer further comprising a conjugation-breaking repeat unit that does not provide any conjugation path between repeat units adjacent to the conjugation-breaking repeat unit. The copolymer may be used as a host material of a phosphorescent material in a light-emitting layer of an organic light-emitting device.

Abstract: We describe a lighting tile having a substrate bearing an electrode structure, the electrode structure comprising: a plurality of electrically conductive tracks disposed over said substrate; and an electrical connection region connecting to said plurality of tracks; wherein the height of said tracks tapers away from said connection region to compensate for a reduction in luminance from said lighting tile array from the electrical connection region which arises from a non-uniform voltage drop which appears along the tracks in use. Advantageously the tracks are fabricated by electroplating: then, as the rate of deposition is determined by the voltage drop along a track during plating, the height of the deposited tracks, and therefore their resistance, will match the profile required in operation to compensate for the reduction in luminance which would otherwise occur.

Abstract: A method is provided to produce an opto-electronic device comprising a substrate, a first electrode layer, a second electrode layer of opposite polarity to said first electrode layer, any interlayers and, between said first and second electrode layers, a first functional material in interfacial contact with a second functional material, wherein the first functional material has the structure of a laterally porous film and the second functional material is a film disposed over and interpenetrating with the film of the first functional material.

Abstract: A copolymer comprising a repeat unit of Formula (I) and at least one further repeat unit: Formula (I) wherein: wherein: Ar1 and Ar2 are each independently selected from aryl and heteroaryl, each of which is independently unsubstituted or substituted with one or more substituents; each R is independently a substituent; each n is independently 0, 1 or 2; each m is independently 0, 1, 2 or 3, and at least one of the repeat units of the polymer is a partially conjugating repeat unit.

Abstract: An organic light emissive device, which comprises: an anode; a cathode; and an organic light emissive region between the anode and the cathode, which region comprises: a layer of blue light electroluminescent organic material which emits light having first CIE co-ordinates by exciton radiative decay; and a layer of longer wavelength electroluminescent organic material which intrinsically emits light having second CIE co-ordinates by exciton radiative decay; wherein the layers of blue light and longer wavelength materials are selected so that the organic light emissive region emits white light falling within a region having a CIE ? coordinate equivalent to that emitted by a black body at 3000-9000K and CIE ? co-ordinate of said light emitted by a black body.

Abstract: An organic semiconducting compound comprising the structure of formula (I): where Ar1, Ar2, Ar3 and Ar4 independently comprise monocyclic aromatic rings and at least one of Ar1, Ar2, Ar3 and Ar4 is substituted with at least one substituent X, which in each occurrence may be the same or different and is selected from the group consisting of (i) optionally substituted straight, branched or cyclic alkyl chains with 1 to 20 carbon atoms, alkoxy, amino, amido, silyl or alkenyl, or (ii) a polymerizable or reactive group selected from the group consisting of halogens, boronic acids, diboronic acids and esters of boronic acids and diboronic acids, alkylene groups and stannyl groups, and where Ar1, Ar2, Ar3 and Ar4 may each optionally be fused to one or more further rings. The organic semiconducting compound is used as an active layer in an organic semiconducting device such as a thin film transistor.

Abstract: A polymer comprising a repeat unit of formula (I): (I) wherein Ar6 and Ar7 each independently represent a substituted or unsubstituted aryl or heteroaryl group; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar6 from Ar7; m is at least 1; and if m is greater than 1 then —(Ar7)m forms a linear or branched chain of Ar7 groups in which Ar7 in each occurrence may be the same or different.

Abstract: An organic light emitting device having a phase-separated light-emissive layer comprising: a charge transport phase comprising a charge transport material; and an emitting phase, the emitting phase comprising a plurality of discrete emissive domains dispersed in the charge transport phase, each emitting domain comprising a host material and one or more metal complexes for emitting light by phosphorescence; wherein the charge transport material has a T1 energy level lower than the T1 energy level of the metal complexes and the host material has a T1 energy level higher than the T1 energy level of the metal complexes.

Abstract: The invention provides the use of a solvent selected from the group consisting of alkoxybenzenes and alkyl substituted alkoxybenzenes in reducing the contact resistance in an organic thin film transistor comprising a semiconductor layer comprising a blend of a small molecule semiconductor material and a polymer material that is deposited from a solution of said small molecule semiconductor material and said polymer material in said solvent and novel semiconductor blend formulations that are of particular use in preparing organic thin film transistors. Said solvents yield devices with lower absolute contact resistance, lower absolute channel resistance, and lower proportion of contact resistance to the total channel resistance.

Abstract: A monomer for use in manufacturing a conjugated polymer, the monomer having a structure as shown formula (2): Ar1, Ar2 and Ar3 are independently selected from optionally substituted aryl or heteroaryl, X1 and X3 both independently comprise a leaving group capable of participating in polymerization and Z represents a direct bond or an optionally substituted bridging atom.

Abstract: A polymer comprising repeat units of formula (I) and repeat units of formula (II): wherein: Ar1 and Ar2 independently in each occurrence represents an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; Ar3 represents a fused aromatic or heteroaromatic group that may be unsubstituted or substituted with one or more substituents; R is a substituent; m is 0, 1 or 2 with the proviso that Ar2 is not phenanthrene if m is 1; each R9 is independently a substituent, and the two groups R9 may be linked to form a ring; each z is independently 0, 1 or 2; and each R10 is independently a substituent. The polymer may be used in an organic light-emitting device.

Abstract: Composition having an organic semiconducting material and a triplet-accepting material of formula (I) with a triplet energy level lower than the triplet energy level of the organic semiconducting material, in which each Ar is optionally substituted aryl or heteroaryl group, n is 1-3, m is 1-5, q is 0 or 1, each R3 is H or a substituent, and each R4 is H or a substituent. Where R4 is not H, R4 and (Ar)m bound to the same carbon atom may be linked by a direct bond or a divalent group. Where n or m is at least 2, adjacent Ar groups may be linked by a divalent group. Where q=0, R3 is not H and is linked to (Ar)n by a direct bond or a divalent group.

Abstract: An organic electroluminescent device comprising: a transparent substrate; a first electrode disposed over the substrate for injecting charge of a first polarity; a second electrode disposed over the first electrode for injecting charge of a second polarity opposite to said first polarity; an organic light-emitting layer disposed between the first and the second electrode, wherein the second electrode is reflective, the first electrode is transparent or semi-transparent, and one or more intermediate layers of dielectric material with a refractive index greater than 1.

Abstract: A white light emitting material comprising a polymer having an emitting polymer chain and at least one emitting end capping group.

Abstract: A method of modifying a fluorinated polymer surface comprising the steps of depositing a first layer on at least a portion of the fluorinated polymer surface, the first layer comprising a first polymer, the first polymer being a substantially perfluorinated aromatic polymer; and depositing a second layer on at least a portion of the first layer, the second layer comprising a second polymer, the second polymer being an aromatic polymer having a lower degree of fluorination than said first polymer, whereby the second layer provides a surface on to which a substance having a lower degree of fluorination than the first polymer, e.g. a non-fluorinated substance is depositable.