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Spectroscopic properties of poly(9,9-dioctylfluorene) thin films possessing varied fractions of -phase chain segments: enhanced photoluminescence efficiency via conformation structuring

Title: Spectroscopic properties of poly(9,9-dioctylfluorene) thin films possessing varied fractions of -phase chain segments: enhanced photoluminescence efficiency via conformation structuring
Authors: Perevedentsev, A
Chander, N
Kim, J-S
Bradley, DDC
Item Type: Journal Article
Abstract: Poly(9,9-dioctylfluorene) (PFO) is a widely studied blue-emitting conjugated polymer, the optoelectronic properties of which are strongly affected by the presence of a well-defined chain-extended “β-phase” conformational isomer. In this study, optical and Raman spectroscopy are used to systematically investigate the properties of PFO thin films featuring a varied fraction of β-phase chain segments. Results show that the photoluminescence quantum efficiency (PLQE) of PFO films is highly sensitive to both the β-phase fraction and the method by which it was induced. Notably, a PLQE of ∼69% is measured for PFO films possessing a ∼6% β-phase fraction induced by immersion in solvent/nonsolvent mixtures; this value is substantially higher than the average PLQE of ∼55% recorded for other β-phase films. Furthermore, a linear relationship is observed between the intensity ratios of selected Raman peaks and the β-phase fraction determined by commonly used absorption calibrations, suggesting that Raman spectroscopy can be used as an alternative means to quantify the β-phase fraction. As a specific example, spatial Raman mapping is used to image a mm-scale β-phase stripe patterned in a glassy PFO film, with the extracted β-phase fraction showing excellent agreement with the results of optical spectroscopy.
Issue Date: 29-Jun-2016
Date of Acceptance: 23-May-2016
URI: http://hdl.handle.net/10044/1/42870
DOI: http://dx.doi.org/10.1002/polb.24106
ISSN: 1099-0488
Publisher: Wiley
Start Page: 1995
End Page: 2006
Journal / Book Title: Journal of Polymer Science Part B-Polymer Physics
Volume: 54
Issue: 19
Copyright Statement: © 2016 The Authors. Journal of Polymer Science Part B: Polymer Physics Published by Wiley Periodicals, Inc. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/3.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Science & Technology
Physical Sciences
Polymer Science
conformation
conjugated polymers
microstructure
polyfluorene
spectroscopy
BETA-PHASE
CONJUGATED POLYMERS
OPTICAL-PROPERTIES
POLYFLUORENE
MORPHOLOGY
FLUORESCENCE
PHOTOPHYSICS
AGGREGATION
DEVICE
POLY(9,9-DI-N-OCTYLFLUORENE)
Polymers
03 Chemical Sciences
09 Engineering
Publication Status: Published
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences



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