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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 orcid (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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publishing date
type
Contribution to journal
publication status
published
subject
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Chemistry of Materials
volume
26
issue
16
pages
4867 - 4875
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000340992900026
  • scopus:84906696527
ISSN
0897-4756
DOI
10.1021/cm5021959
language
English
LU publication?
yes
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The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
id
86a9be71-e9ca-4797-98c2-ec82ad047319 (old id 4720122)
date added to LUP
2016-04-01 11:08:15
date last changed
2021-09-29 05:14:31
@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 (ACS)},
  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},
  doi          = {10.1021/cm5021959},
  volume       = {26},
  year         = {2014},
}