Patent ID: 7357990
Filing Date: 2008-04-15
Classification: C08G,C09K,H01L,H05B,Y10S

Abstract:
1. A method for producing a polymeric fluorescent substance characterized by comprising the steps of contacting with an alkali a crude polymeric fluorescent substance by dissolving the substance in an organic solvent with the alkali to prepare a solution of said substance, sealing said solution in an inert atmosphere and shielding said solution from light having wavelengths absorbable by the solution, wherein said crude polymeric fluorescent substance is fluorescent in a solid state and has a polystyrene equivalent number average molecular weight of 10 4 to 10 8 and one or more repeating units represented by the following formula (1): wherein Ar 1 is an arylene group or heterocyclic compound group that is unsubstituted or substituted by one or more substituents; R 1 and R 2 each independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, a heterocyclic compound group and a cyano group, in which the aryl group and the heterocyclic compound group is optionally substituted by another substituent; and n is 0 or 1.