Abstract: A light emitting electrochemical cell (LEEC, 21) is described comprising a first electrode (23); a further electrode (26) comprising ionic salt; and a light emitting element (25) between the first (23) and further electrodes (26). A method of manufacturing a light emitting electrochemical cell (LEEC, 21) is described comprising: forming a first electrode (23); forming a light emitting element (25) overlying the first electrode (23); forming a further electrode (26) by applying a substance comprising ionic salt to a side of the light emitting element (25) furthest from the first electrode (23).

Abstract: The present invention relates to an active crystalline material, especially an active multicomponent crystalline material such as a salt or a cocrystal, which may be made by dispersing precursor components of the active crystalline material in a liquid medium which comprises an anti-solvent, maintaining the dispersion for a period during which the active crystalline material is formed, and, during said period, exposing the dispersion to a solvent, which solvent being present in the liquid medium in a minor proportion by weight thereof.

Abstract: This invention comprises a field effect transistor which comprises source and drain electrodes (01) which are bridged by a semiconductor which comprises semiconducting crystallites, the conductivity of the semiconductor being controlled by a gate electrode (02) which is insulated from the semiconductor and the source and drain electrodes, to which a potential is applied for controlling the conductivity of the semiconductor, in which at least part of the facing surfaces of the source and drain electrodes are geometrically formed such that they provide current flow of different directions between the electrodes through the said channel. By this means current is caused to flow through more orientations of the crystals resulting in greater uniformity of performance between different transistors when there is a degree of variable crystallographic orientation.

Abstract: The present invention relates to an active crystalline material, especially an active multicomponent crystalline material such as a salt or a cocrystal, which may be made by dispersing precursor components of the active crystalline material in a liquid medium which comprises an anti-solvent, maintaining the dispersion for a period during which the active crystalline material is formed, and, during said period, exposing the dispersion to a solvent, which solvent being present in the liquid medium in a minor proportion by weight thereof.

Abstract: This invention comprises a field effect transistor which comprises source and drain electrodes (01) which are bridged by a semiconductor which comprises semiconducting crystallites, the conductivity of the semiconductor being controlled by a gate electrode (02) which is insulated from the semiconductor and the source and drain electrodes, to which a potential is applied for controlling the conductivity of the semiconductor, in which at least part of the facing surfaces of the source and drain electrodes are geometrically formed such that they provide current flow of different directions between the electrodes through the said channel. By this means current is caused to flow through more orientations of the crystals resulting in greater uniformity of performance between different transistors when there is a degree of variable crystallographic orientation.