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