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The electrochemical properties of MEH-PPV were studied in ionic liquid ( [bmim]+[PF6]- ) by cyclic voltammetry, chronoamperometry and AC impedance measurements.Both p- and n-doping of MEH-PPV were observed in the cyclic voltammograms.The chronoamperometric and AC impedance results indicate that the p-doping of MEH-PPV was controlled by the linear diffusion of counterions.