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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4720122
- author
- Sahoo, Dibakar
LU
; Sugiyasu, Kazunori
; Tian, Yuxi
LU
; Takeuchi, Masayuki
and Scheblykin, Ivan
LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- 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
- additional info
- 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
- 2022-04-05 21:42:44
@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}},
}