Enhancing the thermal and spectral stabilities of polyfluorene-based blue-light-emitting materials by incorporating pendent spiro-cycloalkyl groups

Fang Iy Wu, Rajasekhar Dodda, Kavitha Jakka, Jun Hao Huang, Chain-Shu Hsu, Ching Fong Shu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We have synthesized polyfluorene-based copolymers containing spiro-cycloalkyl groups functionalized on the C-9 position of alternate fluorene units using the Suzuki coupling reaction. The presence of the rigid spiro-cycloalkyl pendent groups not only hinders the close packing and intermolecular interactions between polymer chains, but also preserves the molecular rigidity of the polymer, leading to polyfluorenes with high glass transition temperatures and improved thermal and spectral stabilities. The results of photoluminescence measurements of the isothermally heated spiro-polyfluorene thin films (150°C for 20 h) show that the commonly observed aggregate/excimer formation is suppressed effectively in these polymers. Blue electroluminescence was demonstrated in a double-layer LED device using the spiro-derivatized polyfluorene as the emitting layer.

Original languageEnglish
Pages (from-to)4257-4263
Number of pages7
Journalpolymer
Volume45
Issue number12
DOIs
StatePublished - 1 Jan 2004

Keywords

  • Photoluminescence
  • Polyfluorene
  • Thermal stability

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