Conformation-Dependent Photostability among and within Single Conjugated Polymers
Abstract
The relationship between photostability and conformation of 2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) conjugated polymers was studied via excitation polarization modulation depth (M) measurements. Upon partial photobleaching, M distributions of collapsed, highly ordered MEH-PPV molecules shifted toward lower values. Conversely, M distributions of MEH-PPV molecules with random coil conformations moved toward higher values after partial photobleaching. Monte Carlo simulations of randomly distributed dipole moments along polymer chains subjected to partial photobleaching revealed that a statistical effect leads to an increase in peak M value. Decreases in M values seen experimentally in the population of MEH-PPV molecules with high M values, however, are due to conformation-dependent photostability within single MEH-PPV polymers. Here, we show that, while folded MEH-PPV molecules are relatively more photostable than extended MEH-PPV molecules in an ensemble, extended portions of particular molecules are more photostable than folded domains within single MEH-PPV molecules.
- Authors:
-
- Columbia Univ., New York, NY (United States)
- Columbia Univ., New York, NY (United States); Sungkyunkwan Univ., Suwon (Korea)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1370363
- Grant/Contract Number:
- SC0001085; CHE 1213242
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 11; Related Information: RPEMSC partners with Columbia University (lead); Brookhaven National Laboratory; Purdue University; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Conjugated polymer; MEH-PPV; fluorescence; modulation depth; exciton migration; photobleaching
Citation Formats
Park, Heungman, Hoang, Dat Tien, Paeng, Keewook, Yang, Jaesung, and Kaufman, Laura J. Conformation-Dependent Photostability among and within Single Conjugated Polymers. United States: N. p., 2015.
Web. doi:10.1021/acs.nanolett.5b03409.
Park, Heungman, Hoang, Dat Tien, Paeng, Keewook, Yang, Jaesung, & Kaufman, Laura J. Conformation-Dependent Photostability among and within Single Conjugated Polymers. United States. https://doi.org/10.1021/acs.nanolett.5b03409
Park, Heungman, Hoang, Dat Tien, Paeng, Keewook, Yang, Jaesung, and Kaufman, Laura J. Tue .
"Conformation-Dependent Photostability among and within Single Conjugated Polymers". United States. https://doi.org/10.1021/acs.nanolett.5b03409. https://www.osti.gov/servlets/purl/1370363.
@article{osti_1370363,
title = {Conformation-Dependent Photostability among and within Single Conjugated Polymers},
author = {Park, Heungman and Hoang, Dat Tien and Paeng, Keewook and Yang, Jaesung and Kaufman, Laura J.},
abstractNote = {The relationship between photostability and conformation of 2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) conjugated polymers was studied via excitation polarization modulation depth (M) measurements. Upon partial photobleaching, M distributions of collapsed, highly ordered MEH-PPV molecules shifted toward lower values. Conversely, M distributions of MEH-PPV molecules with random coil conformations moved toward higher values after partial photobleaching. Monte Carlo simulations of randomly distributed dipole moments along polymer chains subjected to partial photobleaching revealed that a statistical effect leads to an increase in peak M value. Decreases in M values seen experimentally in the population of MEH-PPV molecules with high M values, however, are due to conformation-dependent photostability within single MEH-PPV polymers. Here, we show that, while folded MEH-PPV molecules are relatively more photostable than extended MEH-PPV molecules in an ensemble, extended portions of particular molecules are more photostable than folded domains within single MEH-PPV molecules.},
doi = {10.1021/acs.nanolett.5b03409},
journal = {Nano Letters},
number = 11,
volume = 15,
place = {United States},
year = {Tue Oct 06 00:00:00 EDT 2015},
month = {Tue Oct 06 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
In Situ Optical Imaging of the Growth of Conjugated Polymer Aggregates
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