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Effect of temperature on emission of MEH–PPV/PS solid-state solution

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Publication Date
Volume
116
Identifiers
DOI: 10.1016/j.jlumin.2005.03.005
Keywords
  • Photoluminescence
  • Polymer
  • Blend
  • Huang–Rhys Factor

Abstract

Abstract The polymer–polymer interaction of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4- p-phenylenevinylene] (MEH–PPV) in blends with polystyrene (PS) was studied. Photoluminescence spectra of blend films present a new well-resolved peak at 10 K, which appears at lower wavelengths, being associated to an intrachain transition. The emission line shape of MEH–PPV/PS blends was analyzed using a molecular exciton theory, supposing two radiative processes, allied to non-localized (aggregate states) and localized (intrachain) transitions. The temperature dependence of the intrachain transition shows an energy transfer process from localized to non-localized state above 180 K. The electronic structure based on the experimental results is discussed and the electronic-vibrational coupling parameter (Huang–Rhys factor) of MEH–PPV/PS blend was obtained.

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