Efficient upconversion fluorescence in a blue-emitting spirobifluorene- anthracene copolymer doped with low concentrations of Pt(II)octaethylporphyrin

Frederic Laquai*, Gerhard Wegner, Chan Im, Arne Büsing, Susanne Heun

*Corresponding author for this work

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Upconversion-induced fluorescence in platinum-octaethylporphyrin (PtOEP)-doped thin films of a spirobifluorene-anthracene copolymer has been investigated. Upon exciting in the range of the absorption band (2.31 eV, 537 nm) of the guest molecules, blue fluorescence (2.75 eV, 450 nm) from the spirobifluorene host was observed. The intensity of the upconverted emission was found to be one order of magnitude higher than from a PtOEP doped but anthracene-free spirobifluorene copolymer and than previously reported for metallated porphyrin-doped polyfluorene samples. It is argued that the efficient upconversion originates from the triplet energy transfer from the phosphorescent dopant to the sensitive unit of the host polymer, followed by triplet-triplet annihilation and finally blue emission from the spirobifluorene host polymer backbone.

Original languageEnglish (US)
Article number074902
JournalJournal of Chemical Physics
Issue number7
StatePublished - Dec 1 2005

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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