Please use this identifier to cite or link to this item:
|Title:||Photophysical characterization of light-emitting poly(indenofluorene)s||Authors:||Keivanidis, Panagiotis E.
Grimsdale, Andrew C.
|Major Field of Science:||Engineering and Technology||Field Category:||Mechanical Engineering||Keywords:||Donor-acceptor systems;Energy transfer;Light-emitting devices;Polymers;Time-resolved spectroscopy||Issue Date:||12-Aug-2005||Source:||ChemPhysChem, 2005, vol. 6, no. 8, pp. 1650-1660||Volume:||6||Issue:||8||Start page:||1650||End page:||1660||Journal:||ChemPhysChem||Abstract:||Time-resolved photoluminescence spectroscopy experiments of three poly(2,8-indenofluorene) derivatives bearing different pendant groups are presented. A comparison of the photophysical properties of dilute solutions and thin films provides information on the chemical purity of the materials. The photophysical properties of poly(2,8-indenofluorene)s are correlated with the morphological characteristics of their corresponding films. Wide-angle X-ray scattering experiments reveal the order in these materials at the molecular level. The spectroscopic results confirm the positive impact of a new synthetic approach on the spectral purity of the poly(indenofluorene)s. It is concluded that complete side-chain substitution of the bridgehead carbon atoms C-6 and C-12 in the indenofluorene unit, prior to indenofluorene ring formation, reduces the probability of keto formation. Due to the intrinsic chemical purity of the arylated derivative, identification of a long-delayed spectral feature, other than the known keto band, is possible in the case of thin films. Controlled doping experiments on the arylated derivative with trace amounts of an indenofluorene-monoketone provide quantitative information on the rates of two major photophysical processes, namely, singlet photoluminescence emission and singlet photoluminescence quenching. These results allow the determination of the minimum keto concentration that can affect the intrinsic photophysical properties of this polymer. The data suggest that photoluminescence quenching operates in the doped films according to the Stern-Volmer formalism.||URI:||https://ktisis.cut.ac.cy/handle/10488/18164||ISSN:||1439-7641||DOI:||10.1002/cphc.200400634||Rights:||© Wiley||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 20, 2020
checked on Oct 24, 2020
Items in KTISIS are protected by copyright, with all rights reserved, unless otherwise indicated.