| abstract |
A polymeric fluorescent substance showing fluorescence in the solid state,nhaving a polystyrene reduced number-average molecular weight of 10 3 to 10 8 , andncomprising one or more repeating units of formula (1) and one or more repeatingnunits of formula (2) which is different from formula (1),n nexhibits strong fluorescence and/or excellent charge transporting property, and a highnperformance polymer LED which can be driven at low voltage and high efficiency isnobtained. |