Light emitting electrochemical cells as mixed ionic electronic conductors

I. Riess, D. Cahen

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Polymer electrochemical cells have been reported to emit light. The current and light output increase rapidly with voltage, apparently beyond 2 V. The polymer is an ionic conductor as well as an electronic (electron/hole) conductor, i.e. a mixed ionic-electronic conductor (MIEC). The I-V relations are explained here to be those of an MIEC of a particular defect model placed between two ion blocking electrodes. This MIEC defect model assumes a large concentration of mobile ions and small concentrations of electrons and holes. A p and an n region are formed in the MIEC. However, there is no space charge within the MIEC and it stays neutral. The resulting I-V relations are exponential. A good fit to the experimental data is obtained when electrode over-potential and heating of the polymer under current are taken into consideration.

Original languageEnglish
Pages (from-to)687-694
Number of pages8
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1998 MRS Fall Meeting - Symposium 'Solid State Ionics V' - Boston, MA, USA
Duration: 28 Nov 19983 Dec 1998


Dive into the research topics of 'Light emitting electrochemical cells as mixed ionic electronic conductors'. Together they form a unique fingerprint.

Cite this