POLARIZED FLUORESCENCE AND ELECTROLUMINESCENCE FROM RUBBING-ALIGNED CONJUGATED POLYMERS AND THEIR COMPOSITES WITH FLUORESCENT DYES

Polarized fluorescence and optical absorption studies of rubbing-treat ed poly(2,5-diheptyloxybenzene) and poly (3-alkylthiophene)s (PATs) we re carried out with the aim of obtaining polarized electroluminescence (EL). It was revealed that there exists an optimum alkyl chain length in PATs for the effect of rubbing. Polarized EL with a dichroic ratio of 2.6 was observed from a rubbing-aligned PAT-12 film. It was also d emonstrated that the rubbing treatment of composite films of PAT and s everal fluorescent dyes such as 1,4-bis (2-methylstyryl)benzene enable d us iio obtain polarized emission from oriented dye molecules. (C) 19 97 by John Wiley & Sons, Ltd.