Tuning the exciton diffusion coefficient of polyfluorene based semiconducting polymers

Muhammad T. Sajjad, Alexander J. Ward, Arvydas Ruseckas, Ashu K. Bansal, Sybille Allard, Ullrich Scherf, Ifor D. W. Samuel

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
19 Downloads (Pure)

Abstract

Exciton diffusion plays an important role in functional materials used in organic optoelectronic devices, such as solar cells, organic light emitting diodes, and lasers. Here we explore how exciton diffusion can be controlled in highly fluorescent blue‐emitting polyfluorene materials by changing the length and type of side chains. We find that the exciton diffusion coefficient (D) decreases from 1.2 × 10−3 cm2 s−1 to 0.2×10−3 cm2 s−1 when the side chain length is increased from 8 to 12 carbon atoms. Other changes to the side chains led to enhancement of D up to 1.6 × 10−3 cm2 s−1. Our results show that small adjustments to the molecular structure can be helpful for the future development of high‐brightness organic light emitting devices.
Original languageEnglish
Article number1800500
JournalPhysica Status Solidi - Rapid Research Letters
VolumeEarly View
Early online date12 Dec 2018
DOIs
Publication statusE-pub ahead of print - 12 Dec 2018

Keywords

  • Exciton diffusion
  • Fluorescence
  • Light emitting polymers
  • OLEDs
  • Photophysics

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