Highly polarized blue electroluminescence from homogeneously aligned films of poly(9,9-dioctylfluorene)

K. S. Whitehead, M. Grell, D. D.C. Bradley, M. Jandke, P. Strohriegl

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224 Scopus citations

Abstract

Homogeneous alignment of poly(9,9-dioctylfluorene) films on thin layers of rubbed precursor-route poly(p-phenylenevinylene) allows the construction of light-emitting diodes that emit highly polarized blue light (λem=458 nm). The rubbed poly(p-phenylenevinylene) acts as an effective hole-injecting alignment layer. Annealing of poly(9,9-dioctylfluorene) in its nematic phase followed by rapid quenching orients the polymer as a glassy monodomain on the alignment layer and gives devices with a polarization ratio of 25:1 and a luminance of up to 250 cd/m2. © 2000 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Volume76
Issue number20
DOIs
StatePublished - May 15 2000
Externally publishedYes

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