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Polymer light-emitting electrochemical cells: frozen-junction operation of an “ionic liquid” device
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2005 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 87, no 4, 043506Article in journal (Refereed) Published
Abstract [en]

We report frozen-junction operation of a polymer light-emitting electrochemical cell containing a mixture of poly[2-methoxy-5-(2(')-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and the ionic liquid tetra-n-butylammonium trifluoromethanesulfonate (TBA-TF) as the active material. We find fast turn-on time, unipolar light emission, and significant operational lifetime up to T=200 K for planar Au/(TBA-TF+MEH-PPV)/Au surface cells, which had been charged (i.e., electrochemically p- and n-type doped in situ) at T=393 K and V=4 V and then cooled to 80 K at V=4 V. We employed differential scanning calorimetry to demonstrate that (TBA-TF+MEH-PPV) exhibits two melting transitions of TBA-TF crystalline phases located at T(m,1)approximate to 280 K and T(m,2)approximate to 380 K, respectively. The lower T-m,T-1 sets the upper limit for frozen-junction operation (with zero-ionic conductivity), while the larger T-m,T-2 correlates to the lower limit for the charging regime (with high ionic conductivity).

Place, publisher, year, edition, pages
Melville: American Institute of Physics (AIP), 2005. Vol. 87, no 4, 043506
Keyword [en]
I-N junction, morphology, stability, efficient, kinetics, salt
National Category
Physical Sciences
URN: urn:nbn:se:umu:diva-12199DOI: 10.1063/1.1999009ISI: 000230725900068OAI: diva2:151870
Available from: 2007-03-26 Created: 2007-03-26 Last updated: 2016-06-09Bibliographically approved

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Shin, Joon-HoFransson, ÅkeEdman, Ludvig
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