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Antoni Munar, Andreas Sandström, Shi Tang and Ludvig Edman Shedding Light on the Operation of Polymer Light-Emitting Electrochemical Cells Using Impedance Spectroscopy Advanced Functional Materials 22

Version of Record online: 30 JAN 2012 | DOI: 10.1002/adfm.201102687

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The formation of electric double layers (EDLs) and an emissive p–n junction in light-emitting electrochemical cells are studied. At low applied voltage, EDLs with a thickness of ≈2–3 nm form at the electrode interfaces, and at voltages exceeding the bandgap potential of the emissive conjugated polymer, a light-emitting p–n junction forms in situ, with a steady-state structure that depends strongly on the applied voltage.

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