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Operating Modes of Sandwiched Light-Emitting Electrochemical Cells

Authors

  • Martijn Lenes,

    1. Instituto de Ciencia Molecular, Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
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  • Germà Garcia-Belmonte,

    1. Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain
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  • Daniel Tordera,

    1. Instituto de Ciencia Molecular, Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
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  • Antonio Pertegás,

    1. Instituto de Ciencia Molecular, Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
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  • Juan Bisquert,

    Corresponding author
    1. Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain
    • Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain.
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  • Henk J. Bolink

    Corresponding author
    1. Instituto de Ciencia Molecular, Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
    2. Fundación General de la Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
    • Instituto de Ciencia Molecular, Universidad de Valencia, PO Box 22085, ES-46071 Valencia, Spain
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Abstract

Light-emitting electrochemical cells (LECs) are promising lighting devices in which the redistribution of ionic charges allows for double electronic carrier injection from air-stable electrodes. Uncertainties about the mode of operation are limiting the progress of these devices. Using fast (with respect to the current growth time) but resolutive electrical measurement techniques, the electronic transport mechanism in state-of-the-art sandwiched devices can be monitored as a function of the operation time. The results indicate the formation of doped transport layers adjacent to the electrodes that reduces the extent of the central neutral light-emitting layer where electronic transport is limited by space-charge. Prolonged growth of the doped regions beyond that required for efficient injection should be prevented, as this decreases the efficiency and leads to low luminance devices.

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