Semiconducting polymers towards device applications: LEDs, displays and photovoltaics

Summary form only. Conjugated polymers now provide a class of processible, film-forming semiconductors and metals. We have worked on the development of the semiconductor physics of these materials by using them as the active components in a range of semiconductor devices. Polymer light-emitting diodes show particular promise, and I report recent developments in colour range (red, green and blue), efficiency (above 20 lumen/W for green emitters), and operating lifetime. I also discuss progress made on their application to displays, with integration with active-matrix TFT drive, and with patterned deposition using ink-jet printing techniques.