Improved Efficiency in Semiconducting Polymer Light-Emitting DiodesJournal of Electronic Materials
AbstractWe report visible light emission from metal-polymer diodes made from semiconducting polymers, with indium-tin oxide as the “ohmic” contact, and a variety of metals as the barrier metal. Our results, which confirm the discovery by the Cambridge group [Nature347, 539 (1990)], demonstrate that light-emitting diodes can be fabricated by casting the polymer film on indium-tin oxide from solution with no subsequent polymer processing or heat treatment required. Electrical characterization reveals diode behavior with rectification ratios greater than 105 at sufficiently high voltages. Use of an electrode material with low work function leads to more than an order of magnitude improvement in the room-temperature efficiency of the devices. For example, the most efficient devices made with calcium as the rectifying contact display efficiencies of 0.01 photons per electron.
Citation InformationDavid Braun, A. J. Heeger and H. Kromer. "Improved Efficiency in Semiconducting Polymer Light-Emitting Diodes" Journal of Electronic Materials Vol. 20 Iss. 11 (1991) p. 945 - 948
Available at: http://works.bepress.com/dbraun/18/