| Concerted emission and local potentiometry of light-emitting electrochemical cells. | |
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MedLine Citation:
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PMID: 20423059 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We study the operation of polymer light-emitting electrochemical cells (LECs) by combining scanning Kelvin probe microscopy with in situ imaging of the electroluminescence and photoluminescence on planar LECs. By combining these techniques on the same device in the same apparatus we directly map the relationship between the spatial distribution of electroluminescence and the local potential profile across the device. We find that the electroluminescence is always associated with a region of potential drop in LECs made with poly[2-methoxy-5-(3',7'-dimethyl-octyloxy)-p-phenylenevinylene] (MDMO-PPV), poly(ethylene oxide)(PEO), and potassium trifluoromethanesulfonate. Nevertheless, depending on the electrode metal used, we also find significant potential drops at or near the electrode/organic interfaces. We study the effects of using different electrodes and show that both the electroluminescence and potential profiles are strongly dependent on the electrode work function for thin junctions operated at low potentials. These results indicate injection barriers can affect the operation of LECs even in the presence of doping. |
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Authors:
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Deanna B Rodovsky; Obadiah G Reid; Liam S C Pingree; David S Ginger |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: ACS nano Volume: 4 ISSN: 1936-086X ISO Abbreviation: ACS Nano Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-25 Completed Date: 2010-09-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101313589 Medline TA: ACS Nano Country: United States |
Other Details:
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Languages: eng Pagination: 2673-80 Citation Subset: - |
Affiliation:
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Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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