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Effect of Conjugated Backbone Protection on Intrinsic and Light-Induced Fluorescence Quenching in Polythiophenes

Sahoo, Dibakar LU ; Sugiyasu, Kazunori; Tian, Yuxi LU ; Takeuchi, Masayuki and Scheblykin, Ivan LU (2014) In Chemistry of Materials 26(16). p.4867-4875
Abstract
Polythiophenes (PTs), particularly regioregular poly(3-hexylthiophene-2,5-diyl) (rr-P3HT), are important materials in photo-voltaics. The photophysical properties of PTs are still poorly understood, because of their aggregation tendency and formation of interchain species which can be avoided by insulating the conjugated backbone via self-threading. We investigated two polymers, rr-P3HT and its insulated analog, imbedded in PMMA at low concentrations. The exciton decay dynamics and fluorescence quantum yield were analyzed as a function of excitation power densities over the range from 1 x 10(-4) to 100 W/cm(2). For both polymers, substantial (up to S times) photoinduced fluorescence quenching was observed owing to singlet-triplet... (More)
Polythiophenes (PTs), particularly regioregular poly(3-hexylthiophene-2,5-diyl) (rr-P3HT), are important materials in photo-voltaics. The photophysical properties of PTs are still poorly understood, because of their aggregation tendency and formation of interchain species which can be avoided by insulating the conjugated backbone via self-threading. We investigated two polymers, rr-P3HT and its insulated analog, imbedded in PMMA at low concentrations. The exciton decay dynamics and fluorescence quantum yield were analyzed as a function of excitation power densities over the range from 1 x 10(-4) to 100 W/cm(2). For both polymers, substantial (up to S times) photoinduced fluorescence quenching was observed owing to singlet-triplet annihilation and quenching by other long-living charged photoproducts. We found that chain insulation eliminates static (or ultrafast) fluorescence quenching, but has no effect on slow dynamic quenching at time scales longer than 10 ps. We propose that static quenching is solely due to chain aggregation, whereas the dynamic quenching is a consequence of intrachain processes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemistry of Materials
volume
26
issue
16
pages
4867 - 4875
publisher
The American Chemical Society
external identifiers
  • wos:000340992900026
  • scopus:84906696527
ISSN
0897-4756
DOI
10.1021/cm5021959
language
English
LU publication?
yes
id
86a9be71-e9ca-4797-98c2-ec82ad047319 (old id 4720122)
date added to LUP
2014-10-30 13:21:54
date last changed
2017-06-25 03:24:31
@article{86a9be71-e9ca-4797-98c2-ec82ad047319,
  abstract     = {Polythiophenes (PTs), particularly regioregular poly(3-hexylthiophene-2,5-diyl) (rr-P3HT), are important materials in photo-voltaics. The photophysical properties of PTs are still poorly understood, because of their aggregation tendency and formation of interchain species which can be avoided by insulating the conjugated backbone via self-threading. We investigated two polymers, rr-P3HT and its insulated analog, imbedded in PMMA at low concentrations. The exciton decay dynamics and fluorescence quantum yield were analyzed as a function of excitation power densities over the range from 1 x 10(-4) to 100 W/cm(2). For both polymers, substantial (up to S times) photoinduced fluorescence quenching was observed owing to singlet-triplet annihilation and quenching by other long-living charged photoproducts. We found that chain insulation eliminates static (or ultrafast) fluorescence quenching, but has no effect on slow dynamic quenching at time scales longer than 10 ps. We propose that static quenching is solely due to chain aggregation, whereas the dynamic quenching is a consequence of intrachain processes.},
  author       = {Sahoo, Dibakar and Sugiyasu, Kazunori and Tian, Yuxi and Takeuchi, Masayuki and Scheblykin, Ivan},
  issn         = {0897-4756},
  language     = {eng},
  number       = {16},
  pages        = {4867--4875},
  publisher    = {The American Chemical Society},
  series       = {Chemistry of Materials},
  title        = {Effect of Conjugated Backbone Protection on Intrinsic and Light-Induced Fluorescence Quenching in Polythiophenes},
  url          = {http://dx.doi.org/10.1021/cm5021959},
  volume       = {26},
  year         = {2014},
}