Please use this identifier to cite or link to this item:
|Title:||Influence of dendronization on spectral diffusion and aggregation in conjugated polymers||Authors:||Lupton, John M.
Keivanidis, Panagiotis E.
Grimsdale, Andrew C.
|Major Field of Science:||Engineering and Technology||Field Category:||Mechanical Engineering||Keywords:||Electroluminescence;Polyfluorenes;Dendrimers;Aggregation;Excitons||Issue Date:||1-Feb-2003||Source:||Advanced Functional Materials, 2003, vol.13, iss. 2, pp. 154-158||Volume:||13||Issue:||2||Start page:||154||End page:||158||Journal:||Advanced Functional Materials||Abstract:||Dendronization has previously been suggested as a means of controlling the level of intermolecular interactions in macromolecular and polymeric compounds. We therefore studied the spectral relaxation dynamics of dendronized and non-dendronized polyfluorenes at different temperatures. Dendronization strongly affects inhomogeneous spectral broadening, resulting in a blue-shift and broadening of the otherwise narrow vibronic progression of polyfluorene at low temperature. Using gated spectroscopy we are able to identify emissive keto defects on isolated chains of both dendronized and non-dendronized polymers, along with a strong aggregation band in the solid state. Surprisingly, the emission from chemical and structural defects is found to be stronger in the case of the dendronized material. The observation of aggregate emission in dendronized polyfluorenes suggests that aggregation in these materials does not occur through linear π-stacking, but rather through electronic interactions at point contacts between chains introduced by structural kinks along the backbone.||URI:||https://ktisis.cut.ac.cy/handle/10488/18161||ISSN:||1616-301X||DOI:||10.1002/adfm.200390022||Rights:||© John Wiley & Sons||Type:||Article||Affiliation :||Max Planck Institute for Polymer Research|
|Appears in Collections:||Άρθρα/Articles|
checked on Aug 31, 2020
WEB OF SCIENCETM
checked on Oct 18, 2020
checked on Oct 24, 2020
Items in KTISIS are protected by copyright, with all rights reserved, unless otherwise indicated.