Advanced

Absorption and Quantum Yield of Single Conjugated Polymer Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) Molecules

Hou, Lei; Adhikari, Subhasis; Tian, Yuxi LU ; Scheblykin, Ivan G. LU and Orrit, Michel (2017) In Nano Letters 17(3). p.1575-1581
Abstract

We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a poly(methyl methacrylate) (PMMA) matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provided new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than in smaller ones. Photoinduced traps and defects formed under prolonged illumination lead to decrease of both polymer fluorescence... (More)

We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a poly(methyl methacrylate) (PMMA) matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provided new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than in smaller ones. Photoinduced traps and defects formed under prolonged illumination lead to decrease of both polymer fluorescence and absorption signals with the latter declining slower.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
absorption, Conjugated polymer, photothermal, quantum yield, quenching
in
Nano Letters
volume
17
issue
3
pages
7 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85014903991
  • wos:000396185800037
ISSN
1530-6984
DOI
10.1021/acs.nanolett.6b04726
language
English
LU publication?
yes
id
7840d492-d9b8-4723-895d-78952279679c
date added to LUP
2017-03-23 09:34:50
date last changed
2018-03-25 04:35:16
@article{7840d492-d9b8-4723-895d-78952279679c,
  abstract     = {<p>We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a poly(methyl methacrylate) (PMMA) matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provided new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than in smaller ones. Photoinduced traps and defects formed under prolonged illumination lead to decrease of both polymer fluorescence and absorption signals with the latter declining slower.</p>},
  author       = {Hou, Lei and Adhikari, Subhasis and Tian, Yuxi and Scheblykin, Ivan G. and Orrit, Michel},
  issn         = {1530-6984},
  keyword      = {absorption,Conjugated polymer,photothermal,quantum yield,quenching},
  language     = {eng},
  month        = {03},
  number       = {3},
  pages        = {1575--1581},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Absorption and Quantum Yield of Single Conjugated Polymer Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) Molecules},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.6b04726},
  volume       = {17},
  year         = {2017},
}