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10 November 2004 Orientation of dopant molecules in thin polyfluorene films
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Aligned and unaligned thin polyfluorene (PF) films doped with varying degrees of the dyes tetraphenyl porphyrin (TPP) and 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) have been investigated via polarised steady-state and time-resolved fluorescence anisotropy measurements. In the aligned films, the PF and DCM emission have dichroic ratios of approximately 10 and 4 respectively, while the TPP emission is completely depolarised. The polarised dopant emission in the case of the DCM is likely to arise from its linear shape and possible orientation parallel to the polymer chains, whereas the TPP is planar and exhibits no preferential orientation. These experiments show the possibility of polarised, red-shifted luminescence from polymer films.
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Benjamin P. Lyons and Andrew P. Monkman "Orientation of dopant molecules in thin polyfluorene films", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.556814;

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