Profile: Cambridge Display Technology Ltd. is a developer of technologies based on polymer light emitting diodes. Polymer light emitting diodes are designed for use in the electronic displays and in lighting products. It can be used to produce light of a wide range of wavelengths including light outside the visible range by modifying the precise structure of the polymer used. Its structure consists of a transparent conducting anode with a large work function, a conducting polymer layer which transports and injects holes into the active layers, a thin organic interlayer material, a thin light emitting polymer layer and a metallic cathode with a low work function such as a barium or aluminium bi-layer.