Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads
We synthesized four C60-(light-harvesting antenna) dyads C60 (>CPAF-Cn) (n = 4, 9, 12, or 18) 1-Cn for the investigation of their broadband nonlinear absorption effect. Since we have previously demonstrated their high function as two-photon absorption (2PA) materials at 1000 nm, a different 2...
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doaj-0e8a1c4848ca4e41a34c946f3cfbe5302020-11-25T00:00:48ZengMDPI AGMolecules1420-30492016-05-0121564710.3390/molecules21050647molecules21050647Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene DyadsSeaho Jeon0Min Wang1Wei Ji2Loon-Seng Tan3Thomas Cooper4Long Y. Chiang5Department of Chemistry, Institute of Nanoscience and Engineering Technology, University of Massachusetts Lowell, Lowell, MA 01854, USADepartment of Chemistry, Institute of Nanoscience and Engineering Technology, University of Massachusetts Lowell, Lowell, MA 01854, USADepartment of Physics, National University of Singapore, Singapore 117542, SingaporeFunctional Materials Division, AFRL/RXA, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH 45433, USAFunctional Materials Division, AFRL/RXA, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH 45433, USADepartment of Chemistry, Institute of Nanoscience and Engineering Technology, University of Massachusetts Lowell, Lowell, MA 01854, USAWe synthesized four C60-(light-harvesting antenna) dyads C60 (>CPAF-Cn) (n = 4, 9, 12, or 18) 1-Cn for the investigation of their broadband nonlinear absorption effect. Since we have previously demonstrated their high function as two-photon absorption (2PA) materials at 1000 nm, a different 2PA wavelength of 780 nm was applied in the study. The combined data taken at two different wavelength ranges substantiated the broadband characteristics of 1-Cn. We proposed that the observed broadband absorptions may be attributed by a partial π-conjugation between the C60 > cage and CPAF-Cn moieties, via endinitrile tautomeric resonance, giving a resonance state with enhanced molecular conjugation. This transient state could increase its 2PA and excited-state absorption at 800 nm. In addition, a trend of concentration-dependent 2PA cross-section (σ2 ) and excited-state absorption magnitude was detected showing a higher σ value at a lower concentration that was correlated to increasing molecular separation with less aggregation for dyads C60(>CPAF-C18) and C60(>CPAF-C9), as better 2PA and excited-state absorbers.http://www.mdpi.com/1420-3049/21/5/647C60-(light-harvesting antenna) nanostructuresZ-scan measurementsultrafast two-photon absorptionnonlinear absorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Seaho Jeon Min Wang Wei Ji Loon-Seng Tan Thomas Cooper Long Y. Chiang |
spellingShingle |
Seaho Jeon Min Wang Wei Ji Loon-Seng Tan Thomas Cooper Long Y. Chiang Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads Molecules C60-(light-harvesting antenna) nanostructures Z-scan measurements ultrafast two-photon absorption nonlinear absorption |
author_facet |
Seaho Jeon Min Wang Wei Ji Loon-Seng Tan Thomas Cooper Long Y. Chiang |
author_sort |
Seaho Jeon |
title |
Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads |
title_short |
Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads |
title_full |
Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads |
title_fullStr |
Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads |
title_full_unstemmed |
Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads |
title_sort |
broadband two-photon absorption characteristics of highly photostable fluorenyl-dicyanoethylenylated [60]fullerene dyads |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2016-05-01 |
description |
We synthesized four C60-(light-harvesting antenna) dyads C60 (>CPAF-Cn) (n = 4, 9, 12, or 18) 1-Cn for the investigation of their broadband nonlinear absorption effect. Since we have previously demonstrated their high function as two-photon absorption (2PA) materials at 1000 nm, a different 2PA wavelength of 780 nm was applied in the study. The combined data taken at two different wavelength ranges substantiated the broadband characteristics of 1-Cn. We proposed that the observed broadband absorptions may be attributed by a partial π-conjugation between the C60 > cage and CPAF-Cn moieties, via endinitrile tautomeric resonance, giving a resonance state with enhanced molecular conjugation. This transient state could increase its 2PA and excited-state absorption at 800 nm. In addition, a trend of concentration-dependent 2PA cross-section (σ2 ) and excited-state absorption magnitude was detected showing a higher σ value at a lower concentration that was correlated to increasing molecular separation with less aggregation for dyads C60(>CPAF-C18) and C60(>CPAF-C9), as better 2PA and excited-state absorbers. |
topic |
C60-(light-harvesting antenna) nanostructures Z-scan measurements ultrafast two-photon absorption nonlinear absorption |
url |
http://www.mdpi.com/1420-3049/21/5/647 |
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