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Multi-layered oriented polyfluorene films.

Shuichi Nagamatsu1, Masahiro Misaki, Yuji Yoshida

  • 1Department of Computer Science, Kyushu Institute of Technology (KIT), 680-4 Kawazu, Iizuka 820-8502, Japan. nagamatu@cse.kyutech.ac.jp

The Journal of Physical Chemistry. B
|April 9, 2009
PubMed
Summary
This summary is machine-generated.

Oriented polyfluorene films achieve polarized emission through thermal treatment. This method tunes emission color using polymer blends, mimicking liquid-crystalline polymer behavior.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Achieving oriented polymer films is crucial for applications like organic light-emitting diodes (OLEDs).
  • Previous methods for oriented polyfluorene films often required specific underlying layers or complex processing.
  • Poly(9,9-dioctylfluorene) (PF8) and its copolymers are key materials in organic electronics due to their optical properties.

Purpose of the Study:

  • To develop a method for creating multilayered oriented polyfluorene films with tunable polarized emission.
  • To investigate the influence of an underlying oriented layer on the structure and optical properties of an overlying layer.
  • To demonstrate the potential for color tuning in polarized emission using polymer blends.

Main Methods:

  • Fabrication of multilayered films using friction-transferred crystalline poly(9,9-dioctylfluorene) (PF8) as the base layer.
  • Spin-coating of subsequent polyfluorene derivative layers onto the oriented base layer.
  • Thermal treatment of the multilayered films at the nematic phase temperature.
  • Characterization using polarized photoluminescence (PL) spectroscopy and grazing incident X-ray diffraction (GIXD).

Main Results:

  • Thermal treatment induced rearrangement and orientation in the upper polyfluorene layer, guided by the underlying friction-transferred PF8 layer.
  • Highly oriented multilayered polyfluorene films exhibiting polarized photoluminescence were successfully obtained.
  • Polarized green emission was demonstrated using a blend of PF8 and poly(9,9-dioctylfluorene-co-benzothiadiazol) (F8BT) in the upper layer.
  • The emission color could be tuned by altering the polymer blend composition in the upper layer.

Conclusions:

  • A novel method for creating oriented polyfluorene films with polarized emission via thermal treatment has been established.
  • The orientation of the underlying layer effectively guides the molecular arrangement of the overlying layer.
  • This technique offers a versatile approach to tune polarized emission color in polymer-based optoelectronic devices without complex substrate preparation.