Liquid crystalline orientation of polyfluorenes for polarized electroluminescence devices

Katharine S. Whitehead, Martin Grell, Donal D.C. Bradley, Markus Jandke, Peter Strohriegl

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations


Liquid crystalline conjugated polymers have potential applications as inexpensive, easy to process polarized back lights for liquid crystal displays. Two `Hairy rod' type conjugated polymers namely, Poly(9,9-dioctylfluorene) and Poly(9,9-dioctylfluorene-co-dithiophene), have been investigated as polarized light emitting materials. In this paper, we present polarized absorption and photoluminescence for films aligned on rubbed precursor PPV alignment layers. We also report electroluminescence measurements for oriented multi-layer devices with rubbed PPV hole transporting alignment layers that produced polarization ratios of up to 25:1 and a luminance of 250 cd/m2. Sample preparation, device fabrication and characterization are described. Preliminary investigations have been made into the performance of PPV as an alignment layer with respect to thermal degradation.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation EngineersBellingham, WA, United States
StatePublished - Jan 1 2000
Externally publishedYes

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