Abstract: A polymer comprising a repeat unit of formula (I): (I) wherein each Ar1 and each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Cy independently represents a saturated heterocyclic or carbocyclic ring that may be unsubstituted or substituted with one or more substituents; n is 1, 2 or 3; and adjacent groups Ar2 may be linked by Ca divalent linking group in the case where n is 2 or 3. The polymer may be used as a charge-transporting material or light-emitting material in an organic light-emitting device.

Abstract: An organic light-emitting device comprising an anode (103); a cathode (109); a light-emitting layer (105) between the anode and the cathode; and an electron-transporting layer (107) comprising an electron-transporting material between the cathode and the light-emitting layer, wherein the cathode comprises a layer of a conducting material (109B) and a layer of an alkali metal compound (109A) between the electron-transporting layer and the layer of conducting material and wherein the electron-transporting material is a conjugated polymer comprising arylene repeat units.

Abstract: A light-emitting composition comprises a polymer and a phosphorescent light-emitting material. The polymer comprises conjugating repeat units of formula (I) and up to 20 mol % of conjugation-blocking repeat units of repeat units of formula (II): Ar1 represents an aryl or heteroaryl group; R1, which may be the same or different in each occurrence, is a substituent; p is 0 or an integer; Ar2 in each occurrence independently represents a substituted or unsubstituted aryl or heteroaryl group; and Sp1 represents an acyclic spacer group that does not provide any conjugation path between the two groups Ar2. Optionally, p is 0, 1, 2, 3 or 4 and each R1 is a non-polar substituent. Each R1 is advantageously selected from C1-30 hydrocarbyl substituents. A light-emitting device comprises an anode, a cathode and a light-emitting layer between the anode and the cathode, the light-emitting layer comprising a light-emitting composition as described.

Abstract: The present invention relates to an organic flow cell battery having a material comprising an organic molecule that can be used as the electroactive redox material for both electrodes of the battery. By enabling two-electron processes both of the oxidation and reduction to occur in a single molecule, a total of 4-electron transitions is achieved, which allows the organic molecule to be used on both sides of the separator, reducing material costs and allowing the battery to be charge in either direction with equal ease.

Abstract: A charge-transfer salt formed from an organic semiconductor doped by a polymer comprising a first repeat unit substituted with at least one group comprising at least one n-dopant. The n-dopant may spontaneously n-dope the organic semiconductor or may n-dope the organic semiconductor upon activation. An electron-injection layer of an organic light-emitting device may comprise the n-doped semiconductor.

Abstract: An organic light emitting device which emits white light in use, comprising a reflective anode (3), a first light emitting layer (9) which emits red light located over said anode, a second light emitting layer (11) which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-reflecting layer (15) and a second semi-reflecting layer (21) with a layer (19) of light transmissive material between the first and second semi-reflecting semi-transparent layers, the distance between the reflective anode (3) and the first semi-reflecting semi-transparent layer (17) being selected to form a micro-cavity which enhances blue light emission and red light emission from the device, and the distance between the reflective anode (3) and the second semi-reflecting semi-transparent layer (21) being selected to enhance green light emission from the device.

Abstract: A method of fabricating an organic light emitting device comprises patterning a first electrode layer to form a grid comprising a mesh of electrically conductive metal tracks, depositing a layer of hole injection material from a solution comprising less than 10% solids by weight in a solvent, the thickness of the wet layer of solution before the solvent is evaporated to dry the film being greater than the track spacing, evaporating the solvent to provide a dry film having an average thickness in the spacing between the tracks which is less than 10% of the wet thickness of the wet layer of solution and an average thickness in the spacing between the tracks which is greater than 25% of the track thickness to provide a more planar top surface than the surface of the metal tracks before the layer of hole injection material was deposited, depositing one or more further layers from solution to provide a light emitting layer and one or more optional charge transporting layers, and depositing a second electrode layer

Abstract: Tetracenothiophene derivatives are disclosed, which comprise alkoxy-C-alkyne solubilizing groups at transversal positions of the tetracenothiophene unit. These compounds enable preferential molecular stacking and a high field effect mobility and at the same time show improved solubility as compared to known benzothiophene- and pentacene-based materials. In addition, organic thin films comprising these derivatives, their use in electronic devices and components, such as organic thin film transistors, and methods of manufacturing the same are disclosed.

Abstract: Fluorescence-based sensors having favourably low detection limits and high sensitivity are disclosed. The sensors comprise one or more solution processable colour filters that are used together with organic LEDs and photodiodes. The colour filters are used to narrow the wavelength range of the OLED emission and/or to reject any light from reaching the photodiode which is not from analyte fluorescence, thereby enhancing the device sensitivity.

Abstract: A method of fractionating a semiconducting polymer wherein the semiconducting polymer comprises polymer chains comprising a defect group, the method comprising the steps of reacting the polymer chains comprising a defect group to form polymer chains comprising separating groups; and separating the polymer chains comprising the separating groups from the semiconducting polymer. The separating group may be a binding group X capable of binding to a solid substrate material 305, for example particulate silica.

Abstract: A method for the fabrication of organic electronic devices includes forming a fluoropolymer layer over a first area of a substrate and a first set of organic electronic devices. The first set of organic electronic devices are pre-fabricated on a second area of the substrate. The method further includes selectively removing the formed fluoropolymer layer from areas within the first area of the substrate by using a liquid solvent. The method further includes subsequent fabrication of organic electronic devices on the substrate.

Abstract: An improved optical detection unit for an assay device, such as a lateral flow device, for the quantitative determination of the concentration of an analyte in a liquid sample, and an assay device comprising the same. The detection unit comprises an organic light emitting diode (OLED) emitter that has an emission spectrum E within the wavelength range from ?1 to ?2, and an organic photodiode detector (OPD) that has a light detection spectrum S within the wavelength range from ?1 to ?2. The detection unit has a test region that comprises a light absorbing component that has an absorbance spectrum A within the wavelength range from ?1 to ?2. The test region is positioned adjacent to the emitter and the detector to form an optical pathway from the light emitting diode to the photodiode through at least a portion of the test region. Formula M defines a relationship between E, S and A, and M is less than about 0.4.

Abstract: Charge Transfer Salt, Electronic Device and Method of Forming the Same A charge-transfer salt formed from a material comprising a unit of formula (I) and an n-dopant: wherein Ar1 is an arylene group; R1 is a substituent comprising at least one cyano group; n is at least 1; R2 is a substituent; and m is 0 or a positive integer. The material may be a polymer. The charge-transfer salt may be used as a layer of an organic electronic device.

Abstract: A polymer comprising a repeat unit of formula (I): wherein R1 in each occurrence is independently H or a substituent; R2 in each occurrence is independently a substituent; and x is 0, 1, 2 or 3. The polymer may be used as a light-emitting polymer in an organic light-emitting device.

Abstract: A light-emitting composition comprising a mixture of a fluorescent light-emitting material a triplet-accepting copolymer comprising a triplet-accepting repeat unit and a repeat unit of formula (I): wherein A is a divalent group; R1 independently in each occurrence is a substituent; R2 in each occurrence is H or a substituent; and x independently in each occurrence is 0, 1, 2 or 3.

Abstract: A polymer having a backbone of alternating N atoms and aromatic or heteroaromatic groups including a repeating structure of formula (I) wherein: R3 independently in each occurrence is a substituent; m is 0 or a positive integer; Ar1 and Ar2 are an aryl or heteroaryl group and at least one group selected from Ar1 and Ar2 has formula (II) wherein: each x is independently 0 or a positive integer; each y is independently 0 or a positive integer, and R1 and R2 independently in each occurrence is a substituent.

Abstract: An organic light emitting device having a layered structure comprising: a getter layer (6); an adhesive layer (5); a non-transparent cathode layer (4); a light-emitting layer (3); and a transparent anode layer (2); wherein the getter layer or adhesive layer include light absorbing materials to improve contrast in use.

Abstract: A phosphorescent compound of formula (I): wherein M is a transition metal; L is a ligand; R1 is a branched C3-20 alkyl group, a cyclic C5-20 alkyl group or group of formula (II): wherein each R5 is a C1-10, alkyl group; each R6 is a substituent; z is 0 or a positive integer; R2 is a C1-10 alkyl group; R3 is a C1-10 alkyl group or a group of formula —(Ar1)p wherein Ar1 is aryl or heteroaryl group and p is at least 1; each R4 is independently a substituent; v is at least 1; w is 0 or a positive integer; x is at least 1; and y is 0 or a positive integer. The compound may be used as a blue light-emitting material in an organic light-emitting device.

Abstract: An organic light-emitting device comprising an anode (101), a cathode (105) and an homogeneous organic light-emitting layer (103) between the anode and the cathode wherein: the light-emitting layer comprises a first light-emitting material mixed with an inert material; the inert material has a HOMO level (HOMOIM) that is further from vacuum than a HOMO level (HOMOLEM) of the first light-emitting material and a LUMO level (LUMOIM) that is closer to vacuum than a LUMO level(LUMOLEM) of the first light-emitting material; and the inert material comprises up to 25 weight % of the light-emitting layer.

Abstract: A phosphorescent ink comprises a first solvent, a stabiliser and a first phosphorescent metal complex wherein the first phosphorescent metal complex comprises at least one aryl-imidazole or heteroaryl-imidazole ligand that may be unsubstituted or substituted with one or more substituents and wherein the solvent is selected from: linear, branched or cyclic ethers comprising one or more O—CH2 units; solvents comprising a CH2—C(R6)H—CH2 unit wherein R6 is an organic residue and the two CH2 groups may be linked by a divalent group: bicyclic, partially or fully saturated solvents; solvents of formula R8—CR7?CR7—CH2—R8 wherein each R7 is independently H or C1-10 alkyl and R8 in each occurrence is independently an organic residue; and solvents comprising a benzyl group. The stabiliser may be an antioxidant. The ink may be used to form an organic light-emitting device.