Origin of Green Emission in Extremely Pure Oligofluorene Films: Effect of Molecular Packing

  • Kang, Ji-Hoon (Department of Chemistry, Seoul National University) ;
  • Shin, Na-Yool (Department of Chemistry, Seoul National University) ;
  • Jo Jung-Ho (Department of Chemistry, Seoul National University) ;
  • Keivanidis Panagiotis E. (Max-Planck-Institute for Polymer Research) ;
  • Laquai Frederic (Max-Planck-Institute for Polymer Research) ;
  • Wegner Gerhard (Max-Planck-Institute for Polymer Research) ;
  • Yoon, Do-Y. (Department of Chemistry, Seoul National University)
  • Published : 2006.10.13

Abstract

Time-resolved photoluminescence spectroscopy measurements of oligofluorenes with various side chains were studied. With extremely pure oligofluorenes, two kinds of red-shifted green emission were observed which have different origins; aggregate formation and on-chain chemical defect. The green emission around 490 nm was largely dependent upon the intermolecular interaction of oliglfuorene molecules. Moreover, by using oligofluorene with high-order liquid crystalline phase, we observed that the green emission was strongly dependent upon the molecular packing in solid films.

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