Charge transport in luminescent polymers studied by in situ fluorescence spectroscopy.
Modulation of the photoluminescence of poly-[2,7-(fluorene)-1,4-(phenylene)] can be attained by reversible electrochemical modification of the conjugated chain (p- or n-doping). Controlled injection of charge quenches the fluorescent emission of the conjugated polymer. The injection of holes completely eliminates the emission, while the electrons only quench up to one-third of the initial fluorescence of the polymer. Analogous quenching effects have been previously reported for solid-state organoelectronic devices. Electrochemical Stern-Volmer plots permit the estimation of the relative mobility of charge carriers in the polymer layer. The mobility of holes is 1 order of magnitude higher that the mobility of electrons, as determined by this method.
Instituto de Biología Molecular y Celular, Universidad Miguel Hernandez, Avda, de la Universidad s/n E-03202 Elche (Alicante), Spain.
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Montilla
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Pastor
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Mateo
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Morallón
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Mallavia
D004563:Electrochemistry; D049449:Luminescence; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*
D011108:Polymers