Time-Resolved Luminescence in Conducting Polymer/Antidot Nanocomposites
We report modification of the structure and properties of conjugated polymers through controlled embedding wide-gap nanocrystals (antidots) within the polymer matrix. Investigations were carried out by means of stationary and time-resolved photoluminescence. Antidots strongly modify the luminescence spectrum of poly(p-phenylene vinylene) but have almost no influence on the spectrum of poly(2-(6-cyano-6′-methylheptyloxy)-1, 4-phenylene. We explain this observation with respect to the different chain structure and electron density distribution in these two materials. The temporal evolution of luminescence spectra in polymer/antidot composites contains a series of characteristic times. The shortest of these (0.35–0.6 ns) are independent of antidot material and characterize processes in the polymer matrix. Larger times considerably exceeding 1 ns are composition-sensitive and attributable to carrier capture by nanocrystals. The qualitative character of the modification of luminescence spectra associated with the inclusion of antidots depends strongly on the characteristics of the polymer matrices and more weakly on the antidot material. This suggests that the predominant effect of the nanocrystals relates to the modification of the matrix near the polymer–inorganic interface.
Keywords: CN-PPP; CONDUCTING POLYMERS; LUMINESCENCE; PPV; TIME-RESOLVED SPECTRA; WIDE-GAP NANOCRYSTALS
Document Type: Research Article
Affiliations: Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada
Publication date: 01 December 2001
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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