Direct measurement of the electric-field distribution in a light-emitting electrochemical cell

Jason D. Slinker, John A. DeFranco, Michael J. Jaquith, William R. Silveira, Yu Wu Zhong, Jose M. Moran-Mirabal, Harold G. Craighead, Héctor D. Abrũa, John A. Marohn, George G. Malliaras

Research output: Contribution to journalArticle

244 Scopus citations

Abstract

The interplay between ionic and electronic charge carriers in mixed conductors offers rich physics and unique device potential. In light-emitting electrochemical cells (LEECs), for example, the redistribution of ions assists the injection of electronic carriers and leads to efficient light emission. The mechanism of operation of LEECs has been controversial, as there is no consensus regarding the distribution of electric field in these devices. Here, we probe the operation of LEECs using electric force microscopy on planar devices. We show that obtaining the appropriate boundary conditions is essential for capturing the underlying device physics. A patterning scheme that avoids overlap between the mixed-conductor layer and the metal electrodes enabled the accurate in situ measurement of the electric-field distribution. The results show that accumulation and depletion of mobile ions near the electrodes create high interfacial electric fields that enhance the injection of electronic carriers.

Original languageEnglish (US)
Pages (from-to)894-899
Number of pages6
JournalNature materials
Volume6
Issue number11
DOIs
StatePublished - Jan 1 2007

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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