Abstract: A compound of the formula, plus devices incorporating this compound, and a method of marking such devices: wherein: A represents a phenyl group, a naphthyl group, a biphenyl group or two phenyl groups linked by a C1-C8 alkyl chain; B1 and B2 in each occurrence are independently selected side chains of the structure —(Y1)n-L-(Y2)m—X wherein: Y1 and Y2 in each occurrence are independently selected from O, CO2— and CH2O, m and n in each occurrence are independently selected from 0 or 1; L in each occurrence is a C2-C14 straight chain alkyl group; and X in each occurrence is an independently selected cross linkable group; C is a side chain of the structure —(Z1)p-M-(Z2)q-E wherein: Z1 and Z2 are independently selected from O, CO2— and CH2O, p and q in each occurrence are independently selected from 0 or 1; M is a C1-C14 straight chain alkyl group; and E comprises a charge transport group; D is a side chain of the structure —(W1)r—N—(W2)s—F wherein: W1 and W2 are independently selected from O, CO2— and

Abstract: A compound of the formula, plus devices incorporating this compound, and a method of marking such devices: wherein: A represents a phenyl group, a naphthyl group, a biphenyl group or two phenyl groups linked by a C1-C8 alkyl chain; B1 and B2 in each occurrence are independently selected side chains of the structure —(Y1)n-L-(Y2)m—X wherein: Y1 and Y2 in each occurrence are independently selected from O, CO2— and CH2O, m and n in each occurrence are independently selected from 0 or 1; L in each occurrence is a C2-C14 straight chain alkyl group; and X in each occurrence is an independently selected cross linkable group; C is a side chain of the structure —(Z1)p-M-(Z2)q-E wherein: Z1 and Z2 are independently selected from O, CO2— and CH2O, p and q in each occurrence are independently selected from 0 or 1; M is a C1-C14 straight chain alkyl group; and E comprises a charge transport group; D is a side chain of the structure —(W1)r—N—(W2)s—F wherein: W1 and W2 are independently selected from O, CO

Abstract: A polymer comprising a first repeat unit of formula (I), wherein each Ar is independently selected from optionally substituted aryl or heteroaryl and the group of formula (I) is present in a molar ratio of less than or equal to 10%, and, optionally, a second, optionally substituted repeat unit having a single nitrogen atom in its backbone of formula —Ar—N(Ar)—Ar— in a molar ratio of no greater than 5%.

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 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 comprising a plurality of electroluminescent zones in laterally separated arrangement, the first of said electroluminescent zones comprising a first polymer and the second of said electroluminescent zones comprising a second polymer, wherein the first polymer comprises a fluorescent blue light emitting species and the second polymer comprises a fluorescent green light emitting species, said first and/or second zones further comprising 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: The invention relates to organic semiconductive polymers comprising a new backbone system, monomers for the preparation of such polymers, methods for the preparation of such polymers and the use of such polymers in organic optoelectronic devices.

Abstract: An organic light emissive device comprising: a first electrode; a second electrode; and an organic light emissive region between the first and second electrodes comprising an organic light emissive material which has a peak emission wavelength, wherein at least one of the electrodes is transparent and comprises a composite of a charge injecting metal and another material which is codepositable with the charge injecting metal, the other material having a different refractive index to that of the charge injecting metal and wherein the other material has a lower degree of quenching at the peak emission wavelength than the charge injecting metal whereby quenching of excitons by the at least one electrode is reduced, the charge injecting metal comprising either a low work function metal having a work function of no more than 3.5 eV or a high work function metal having a work function of no less than 4.5 eV.

Abstract: An organic electroluminescent device comprising: a transparent substrate; a first electrode; a second reflective electrode and an organic light-emitting region for emitting light of a wavelength 1 from a recombination zone within the light-emissive region, and a microcavity formed between the substrate and the second electrode, the distance between the transparent substrate and the second electrode being [(¼ni)l+(½nj)al]±40 nm, where a is zero or a positive integer, ni is an average refractive index of the material disposed between the recombination zone and the second electrode and nj is an average refractive index of the material disposed between the recombination zone and the substrate.

Abstract: An optical device comprising an anode, a cathode comprising barium, strontium or calcium, and a layer of organic semiconducting material between the anode and the cathode wherein a layer of hole transporting and electron blocking material is located between the anode and the layer of organic semiconducting material.

Abstract: A polymer formed from optionally substituted first repeat units of formula (I) wherein Ar is selected from (a) aromatic hydrocarbon substituted with at least one electron withdrawing group or electron withdrawing heteroaryl. The polymers have application in electroluminescent devices.

Abstract: An optical device comprising an anode, a cathode comprising barium, strontium or calcium, and a layer of organic semiconducting material between the anode and the cathode wherein a layer of hole transporting and electron blocking material is located between the anode and the layer of organic semiconducting material.

Abstract: A polymer formed from optionally substituted first repeat units of formula (I) wherein Ar is selected from (a) aromatic hydrocarbon substituted with at least one electron withdrawing group or electron withdrawing heteroaryl. The polymers have application in electroluminescent devices.

Abstract: An organic electroluminescent device comprising: a transparent substrate; a first electrode; a second reflective electrode and an organic light-emitting region for emitting light of a wavelength 1 from a recombination zone within the light-emissive region, and a microcavity formed between the substrate and the second electrode, the distance between the transparent substrate and the second electrode being [(¼ni)l+(½nj)al]±40 nm, where a is zero or a positive integer, ni is an average refractive index of the material disposed between the recombination zone and the second electrode and nj is an average refractive index of the material disposed between the recombination zone and the substrate.

Abstract: An optical device comprising an anode, a cathode comprising barium, strontium or calcium, and a layer of organic semiconducting material between the anode and the cathode wherein a layer of hole transporting and electron blocking material is located between the anode and the layer of organic semiconducting material.

Abstract: A polymer comprising a first repeat unit of formula (I), wherein each Ar is independently selected from optionally substituted aryl or heteroaryl and the group of formula (I) is present in a molar ratio of less than or equal to 10%, and, optionally, a second, optionally substituted repeat unit having a single nitrogen atom in its backbone of formula —Ar—N(Ar)—Ar— in a molar ratio of no greater than 5%.

Abstract: A polymer formed from optionally substituted first repeat units of formula (I) wherein Ar is selected from (a) aromatic hydrocarbon substituted with at least one electron withdrawing group or electron withdrawing heteroaryl. The polymers have application in electroluminescent devices.

Abstract: A method of forming an optical device comprising the steps of: providing a substrate comprising a first electrode capable of injecting or accepting charge carriers of a first type; forming over the first electrode a first layer that is at least partially insoluble in a solvent by depositing a first semiconducting material that is free of cross-linkable vinyl or ethynyl groups and is, at the time of deposition, soluble in the solvent; forming a second layer in contact with the first layer and comprising a second semiconducting material by depositing a second semiconducting material from a solution in the solvent; and forming over the second layer a second electrode capable of injecting or accepting charge carriers of a second type wherein the first layer is rendered at least partially insoluble by one or more of heat, vacuum and ambient drying treatment following deposition of the first semiconducting material.

Abstract: Polymers for use in organic electroluminescent devices The invention relates to organic semiconductive polymers comprising a new backbone system, monomers for the preparation of such polymers, methods for the preparation of such polymers and the use of such polymers in organic optoelectronic devices.

Abstract: A polymer for use in an optical device comprising a first, optionally substituted, repeat unit of formula and a second, optionally substituted, repeat unit of formula wherein each Ar and Ar? is the same or different and comprises an optionally substituted aryl or heteroaryl group and optionally a third, optionally substituted, repeat unit in a molar ratio of no greater than 5%, the third repeat unit having a formula —Ar—N(Ar)—Ar— and having a single nitrogen atom in its backbone.