Conformation-Dependent Photostability among and within Single Conjugated Polymers

Park, Heungman; Hoang, Dat Tien; Paeng, Keewook; Yang, Jaesung; Kaufman, Laura J.

doi:10.1021/acs.nanolett.5b03409

Conformation-Dependent Photostability among and within Single Conjugated Polymers

Journal Article · Tue Oct 06 00:00:00 EDT 2015 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5b03409· OSTI ID:1370363

Park, Heungman ^[1]; Hoang, Dat Tien ^[1]; Paeng, Keewook ^[2]; Yang, Jaesung ^[1]; Kaufman, Laura J. ^[1]

Columbia Univ., New York, NY (United States)
Columbia Univ., New York, NY (United States); Sungkyunkwan Univ., Suwon (Korea)

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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC)

Sponsoring Organization:: National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001085

OSTI ID:: 1370363

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 11 Vol. 15; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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