Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-01-29
Physics
Condensed Matter
Soft Condensed Matter
5 pages, 5 figures. accepted for publication in Solid State Communications
Scientific paper
10.1016/j.ssc.2008.01.040
We report on the effect of electric field on the photoluminescence, PL, from a composite consisting of a conjugated polymer mixed with zinc oxide nanoparticles. We have found that in the absence of electric field PL emission from the composite film has two maxima in the blue and green-yellow regions. Application of a voltage bias to planar gold electrodes suppresses the green-yellow emission and shifts the only PL emission maximum towards the blue region. Current-voltage characteristics of the polymer-nanoparticles composite exhibit the non-linear behavior typical of non-homogeneous polymer-inorganic structures. Generation of excited states in the composite structure implies the presence of several radiative recombination mechanisms including formation of polymer-nanoparticle complexes including exciplex states and charge transfer between the polymer and nanoparticle that can be controlled by an electric field.
Aleshin Andrey N.
Alexandrova Elena L.
Lebedev E. A.
Shcherbakov I. P.
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