Electrochemical doping during light emission in polymer light-emitting electrochemical cells
2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 78, no 24, 245202- p.Article in journal (Refereed) Published
Polymer light-emitting electrochemical cells (LECs), the electrochemical analog of light-emitting diodes, are relatively simple to manufacture yet difficult to understand. The combination of ionic and electronic charge carriers make for a richly complex electrochemical device. This paper addresses two curious observations from wide-gap planar LEC experiments: (1) Both the current and light intensity continue to increase with time long after the p-n junction has formed. (2) The light-emitting p-n junction often moves, both "straightening out" and migrating toward the cathode, with time. We propose that these phenomena are explained by the continuation of electrochemical doping even after the p-n junction has formed. We hope that this understanding will help to solve issues such as the limited lifetime of LECs and will help to make them a more practical device in commercial and scientific applications.
Place, publisher, year, edition, pages
2008. Vol. 78, no 24, 245202- p.
conducting polymers, electrochemical analysis, electrochemical devices, light emitting devices, organic semiconductors, p-n junctions, semiconductor doping
IdentifiersURN: urn:nbn:se:liu:diva-16720DOI: 10.1103/PhysRevB.78.245202OAI: oai:DiVA.org:liu-16720DiVA: diva2:160501
Nathaniel D Robinson, Junfeng Fang, Piotr Matyba and Ludvig Edman, Electrochemical doping during light emission in polymer light-emitting electrochemical cells, 2008, PHYSICAL REVIEW B, (78), 24, 245202.
Copyright: American Physical Society