Polymeric fluorescent substance, production method therof, and polymer light-emitting device using the same

摘要

Provided is a polymeric fluorescent substance which emits fluorescence in the solid state, has a polystyrene-reduced number-average molecular weight of 10<3> to 10<8>, and comprises in the main chain one or more repeating units of formula (1): wherein Ar1 is selected from an arylene group having 6 to 60 carbon atoms, a heterocyclic group having 4 to 60 carbon atoms and a group comprising a metal complex having, as a ligand, one or more organic compounds containing 4 to 60 carbon atoms; Ar1 may have one or more substituents; each of R1 and R2 independently represents a group selected from hydrogen atom, alkyl groups having 1 to 20 carbon atoms, aryl groups having 6 to 60 carbon atoms, heterocyclic groups having 4 to 60 carbon atoms and cyano group; and n is 0 or 1; wherein 0.05 to 10 mol% of all repeating units in the polymeric fluorescent substance have branching polymeric chains. The substance is excellent in film-forming property without losing solubility in a solvent, and preferably used for a polymer LED having high light-emitting efficiency.