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The role of segregation in the polarized emission from polyfluorene embedded in a liquid crystal

Lavinia Ghirardini, Tersilla Virgili, Serena Bolis UGent, Jeroen Beeckman UGent, Pascal Kockaert, Marco Finazzi and Michele Celebrano (2017) Journal of Polymer Science.
abstract
Polyfluorene (PFO) embedded in a nematic liquid crystal (LC) matrix is investigated. For low PFO weight contents, a homogeneous dispersion is obtained which displays a strong fluorescence anisotropy along the LC director, indicating a significant alignment of the polymeric chains along this direction. Besides, for relatively high PFO weight contents, phase separation takes place. Under these conditions, the sample is composed of micrometer-sized domains, where the two species are in solution, enclosed by segregated polymeric boundaries. By polarized-photoluminescence imaging and spectroscopy, it is found that most of the light emission originates from these boundaries and gets strongly pinned along their orientation. Since boundaries are mainly oriented orthogonal to the LC chains, this morphological alignment results in a system in which the orientation of the polarization emission can be predicted and possibly controlled. Conversely, in the homogeneous sample one can obtain a homogeneous emission polarization by controlling the alignment of the LC. These features are potentially relevant for the development of flexible polarization-sensitive optoelectronic devices.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
in press
subject
keyword
luminescence, liquid crystaline polymers, blends, Phase separation
journal title
Journal of Polymer Science
J. Polym. Sci. Pt. B-Polym. Phys.
ISSN
0887-6266
DOI
10.1002/polb.24069
language
English
UGent publication?
yes
classification
A2
copyright statement
I don't know the status of the copyright for this publication
id
7188715
handle
http://hdl.handle.net/1854/LU-7188715
alternative location
http://onlinelibrary.wiley.com/doi/10.1002/polb.24069/full
date created
2016-04-18 16:32:52
date last changed
2017-04-24 09:39:37
@article{7188715,
  abstract     = {Polyfluorene (PFO) embedded in a nematic liquid crystal (LC) matrix is investigated. For low PFO weight contents, a homogeneous dispersion is obtained which displays a strong fluorescence anisotropy along the LC director, indicating a significant alignment of the polymeric chains along this direction. Besides, for relatively high PFO weight contents, phase separation takes place. Under these conditions, the sample is composed of micrometer-sized domains, where the two species are in solution, enclosed by segregated polymeric boundaries. By polarized-photoluminescence imaging and spectroscopy, it is found that most of the light emission originates from these boundaries and gets strongly pinned along their orientation. Since boundaries are mainly oriented orthogonal to the LC chains, this morphological alignment results in a system in which the orientation of the polarization emission can be predicted and possibly controlled. Conversely, in the homogeneous sample one can obtain a homogeneous emission polarization by controlling the alignment of the LC. These features are potentially relevant for the development of flexible polarization-sensitive optoelectronic devices.},
  author       = {Ghirardini, Lavinia and Virgili, Tersilla and Bolis, Serena and Beeckman, Jeroen and Kockaert, Pascal and Finazzi, Marco and Celebrano, Michele},
  issn         = {0887-6266},
  journal      = {Journal of Polymer Science},
  keyword      = {luminescence,liquid crystaline polymers,blends,Phase separation},
  language     = {eng},
  title        = {The role of segregation in the polarized emission from polyfluorene embedded in a liquid crystal},
  url          = {http://dx.doi.org/10.1002/polb.24069},
  year         = {2017},
}

Chicago
Ghirardini, Lavinia, Tersilla Virgili, Serena Bolis, Jeroen Beeckman, Pascal Kockaert, Marco Finazzi, and Michele Celebrano. 2017. “The Role of Segregation in the Polarized Emission from Polyfluorene Embedded in a Liquid Crystal.” Journal of Polymer Science.
APA
Ghirardini, L., Virgili, T., Bolis, S., Beeckman, J., Kockaert, P., Finazzi, M., & Celebrano, M. (2017). The role of segregation in the polarized emission from polyfluorene embedded in a liquid crystal. Journal of Polymer Science.
Vancouver
1.
Ghirardini L, Virgili T, Bolis S, Beeckman J, Kockaert P, Finazzi M, et al. The role of segregation in the polarized emission from polyfluorene embedded in a liquid crystal. Journal of Polymer Science. 2017;
MLA
Ghirardini, Lavinia, Tersilla Virgili, Serena Bolis, et al. “The Role of Segregation in the Polarized Emission from Polyfluorene Embedded in a Liquid Crystal.” Journal of Polymer Science (2017): n. pag. Print.