Aging of poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)/toluene solutions and subsequent effects on luminescence behavior of cast films

Langmuir : the ACS Journal of Surfaces and Colloids
S H ChenS A Chen

Abstract

Morphological effects in luminescence properties of a representative semiconducting polymer, poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV), has recently attracted much attention. Previous studies indicated that short-term heat treatment of solution-cast MEH-PPV films may result in the formation of mesomorphic order that is responsible for the "red" emission around 640 nm, in contrast to the single-chromophore "yellow" emission near 590 nm from the disordered matrix. On the basis of microscopic and spectroscopic evidence for films cast from freshly prepared and aged solutions, here we show that prolonged storage of MEHyellowPPV solutions at room temperature or lower may result in retardation of the thermally induced mesophase formation in the subsequently cast films. According to small-angle neutron scattering and differential scanning calorimetric observations over aged MEH-PPV/toluene solutions, we propose that the suppressed transformation into mesomorphic order is due to further development of nanocrystalline aggregates that serve as physical cross-links among MEH-PPV chains in the solution state upon long-term storage. These solvent-induced nanocrystalline aggregates, however, do not exhibit new spect...Continue Reading

References

Mar 2, 1998·Angewandte Chemie·Arno KraftAndrew B Holmes

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Citations

Jan 10, 2014·Chemical Reviews·Sukumaran Santhosh BabuAyyappanpillai Ajayaghosh
Jan 24, 2013·Advanced Materials·Matti Knaapila, Andrew P Monkman
Jan 22, 2015·The Journal of Physical Chemistry. B·Rong H GuoShow A Chen
Sep 17, 2009·The Journal of Physical Chemistry. B·Nikko Y ChanDave E Dunstan
Feb 25, 2017·Accounts of Chemical Research·Nils E PerssonElsa Reichmanis
Jul 21, 2006·The Journal of Physical Chemistry. B·Kang-Yung PengAn-Chung Su
Mar 3, 2006·The Journal of Physical Chemistry. B·S H ChenS A Chen
May 19, 2006·The Journal of Physical Chemistry. B·Young Jong LeePaul F Barbara

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