Abstract
The diffusion of singlet and triplet excitons along single polyfluorene chains in solution has been studied by monitoring their transport to end traps. Time-resolved transient absorption and steady state fluorescence were used to determine fractions of excitons that reach the end caps. In order to accurately determine the singlet diffusion coefficient, the fraction of polymer ends that have end traps was determined through a combination of NMR and triplet quenching experiments. The distributions of polymer lengths were also taken into account and the resulting analysis points to a surprisingly long singlet diffusion length of 34 nm. Experiments on triplet transport also suggest that the entire 100nm+ chain is accessible to the triplet during its lifetime suggesting a lack of hindrance by defects or traps on this timescale. Time Resolved Microwave Conductivity measurements were also performed on a series of different length oligo- and polyfluorenes in solution allowing a global fit to be performed to extract an accurate intrachain mobility of 1.1 cm2/Vs.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher | SPIE |
| Volume | 9549 |
| ISBN (Print) | 9781628417159 |
| DOIs | |
| Publication status | Published - 2015 |
| Event | Physical Chemistry of Interfaces and Nanomaterials XIV - San Diego, United States Duration: Aug 9 2015 → Aug 12 2015 |
Other
| Other | Physical Chemistry of Interfaces and Nanomaterials XIV |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 8/9/15 → 8/12/15 |
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Keywords
- Conjugated polymers
- exciton diffusion length
- microwave conductivity
- OPV
- polyfluorene
- single chain
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Singlet, triplet, electron and hole transport along single polymer chains. / Bird, Matthew; Mauro, Gina; Zaikowski, Lori; Li, Xiang; Reid, Obadiah; Karten, Brianne; Asaoka, Sadayuki; Chen, Hung Cheng; Cook, Andrew R.; Rumbles, Gary; Miller, John R.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9549 SPIE, 2015. 95490E.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Singlet, triplet, electron and hole transport along single polymer chains
AU - Bird, Matthew
AU - Mauro, Gina
AU - Zaikowski, Lori
AU - Li, Xiang
AU - Reid, Obadiah
AU - Karten, Brianne
AU - Asaoka, Sadayuki
AU - Chen, Hung Cheng
AU - Cook, Andrew R.
AU - Rumbles, Gary
AU - Miller, John R.
PY - 2015
Y1 - 2015
N2 - The diffusion of singlet and triplet excitons along single polyfluorene chains in solution has been studied by monitoring their transport to end traps. Time-resolved transient absorption and steady state fluorescence were used to determine fractions of excitons that reach the end caps. In order to accurately determine the singlet diffusion coefficient, the fraction of polymer ends that have end traps was determined through a combination of NMR and triplet quenching experiments. The distributions of polymer lengths were also taken into account and the resulting analysis points to a surprisingly long singlet diffusion length of 34 nm. Experiments on triplet transport also suggest that the entire 100nm+ chain is accessible to the triplet during its lifetime suggesting a lack of hindrance by defects or traps on this timescale. Time Resolved Microwave Conductivity measurements were also performed on a series of different length oligo- and polyfluorenes in solution allowing a global fit to be performed to extract an accurate intrachain mobility of 1.1 cm2/Vs.
AB - The diffusion of singlet and triplet excitons along single polyfluorene chains in solution has been studied by monitoring their transport to end traps. Time-resolved transient absorption and steady state fluorescence were used to determine fractions of excitons that reach the end caps. In order to accurately determine the singlet diffusion coefficient, the fraction of polymer ends that have end traps was determined through a combination of NMR and triplet quenching experiments. The distributions of polymer lengths were also taken into account and the resulting analysis points to a surprisingly long singlet diffusion length of 34 nm. Experiments on triplet transport also suggest that the entire 100nm+ chain is accessible to the triplet during its lifetime suggesting a lack of hindrance by defects or traps on this timescale. Time Resolved Microwave Conductivity measurements were also performed on a series of different length oligo- and polyfluorenes in solution allowing a global fit to be performed to extract an accurate intrachain mobility of 1.1 cm2/Vs.
KW - Conjugated polymers
KW - exciton diffusion length
KW - microwave conductivity
KW - OPV
KW - polyfluorene
KW - single chain
UR - http://www.scopus.com/inward/record.url?scp=84951865050&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84951865050&partnerID=8YFLogxK
U2 - 10.1117/12.2188873
DO - 10.1117/12.2188873
M3 - Conference contribution
AN - SCOPUS:84951865050
SN - 9781628417159
VL - 9549
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - SPIE
ER -