Fluorescence polarization measures energy funneling in single light-harvesting antennas-LH2 vs conjugated polymers.
Camacho Dejay, Rafael LU ; Tubasum, Sumera LU ; Southall, June ; Cogdell, Richard J ; Sforazzini, Giuseppe ; Anderson, Harry L ; Pullerits, Tönu LU and Scheblykin, Ivan LU
(2015)
In Scientific Reports
5.
- Abstract
- Numerous approaches have been proposed to mimic natural photosynthesis using artificial antenna systems, such as conjugated polymers (CPs), dendrimers, and J-aggregates. As a result, there is a need to characterize and compare the excitation energy transfer (EET) properties of various natural and artificial antennas. Here we experimentally show that EET in single antennas can be characterized by 2D polarization imaging using the single funnel approximation. This methodology addresses the ability of an individual antenna to transfer its absorbed energy towards a single pool of emissive states, using a single parameter called energy funneling efficiency (ε). We studied individual peripheral antennas of purple bacteria (LH2) and single CP... (More)
- Numerous approaches have been proposed to mimic natural photosynthesis using artificial antenna systems, such as conjugated polymers (CPs), dendrimers, and J-aggregates. As a result, there is a need to characterize and compare the excitation energy transfer (EET) properties of various natural and artificial antennas. Here we experimentally show that EET in single antennas can be characterized by 2D polarization imaging using the single funnel approximation. This methodology addresses the ability of an individual antenna to transfer its absorbed energy towards a single pool of emissive states, using a single parameter called energy funneling efficiency (ε). We studied individual peripheral antennas of purple bacteria (LH2) and single CP chains of 20 nm length. As expected from a perfect antenna, LH2s showed funneling efficiencies close to unity. In contrast, CPs showed lower average funneling efficiencies, greatly varying from molecule to molecule. Cyclodextrin insulation of the conjugated backbone improves EET, increasing the fraction of CPs possessing ε = 1. Comparison between LH2s and CPs shows the importance of the protection systems and the protein scaffold of LH2, which keep the chromophores in functional form and at such geometrical arrangement that ensures excellent EET. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8149009
- author
- Camacho Dejay, Rafael
LU
; Tubasum, Sumera
LU
; Southall, June
; Cogdell, Richard J
; Sforazzini, Giuseppe
; Anderson, Harry L
; Pullerits, Tönu
LU
and Scheblykin, Ivan
LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Scientific Reports
- volume
- 5
- article number
- 15080
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:26478272
- wos:000362986400001
- scopus:84945218867
- pmid:26478272
- ISSN
- 2045-2322
- DOI
- 10.1038/srep15080
- 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
- 97a8a527-2f6f-425b-bcfc-433bfa6b7e58 (old id 8149009)
- date added to LUP
- 2016-04-01 13:30:39
- date last changed
- 2023-11-12 18:00:16
@article{97a8a527-2f6f-425b-bcfc-433bfa6b7e58,
abstract = {{Numerous approaches have been proposed to mimic natural photosynthesis using artificial antenna systems, such as conjugated polymers (CPs), dendrimers, and J-aggregates. As a result, there is a need to characterize and compare the excitation energy transfer (EET) properties of various natural and artificial antennas. Here we experimentally show that EET in single antennas can be characterized by 2D polarization imaging using the single funnel approximation. This methodology addresses the ability of an individual antenna to transfer its absorbed energy towards a single pool of emissive states, using a single parameter called energy funneling efficiency (ε). We studied individual peripheral antennas of purple bacteria (LH2) and single CP chains of 20 nm length. As expected from a perfect antenna, LH2s showed funneling efficiencies close to unity. In contrast, CPs showed lower average funneling efficiencies, greatly varying from molecule to molecule. Cyclodextrin insulation of the conjugated backbone improves EET, increasing the fraction of CPs possessing ε = 1. Comparison between LH2s and CPs shows the importance of the protection systems and the protein scaffold of LH2, which keep the chromophores in functional form and at such geometrical arrangement that ensures excellent EET.}},
author = {{Camacho Dejay, Rafael and Tubasum, Sumera and Southall, June and Cogdell, Richard J and Sforazzini, Giuseppe and Anderson, Harry L and Pullerits, Tönu and Scheblykin, Ivan}},
issn = {{2045-2322}},
language = {{eng}},
publisher = {{Nature Publishing Group}},
series = {{Scientific Reports}},
title = {{Fluorescence polarization measures energy funneling in single light-harvesting antennas-LH2 vs conjugated polymers.}},
url = {{http://dx.doi.org/10.1038/srep15080}},
doi = {{10.1038/srep15080}},
volume = {{5}},
year = {{2015}},
}