Patent ID: 6994921

Claim:
A polymeric fluorescent substance exhibiting visible fluorescence in solid state, having a polystyrene reduced number-average molecular weight of 1×10 3 to 1×10 8 , and containing one or more repeating units of the following formula (1), the amount of the repeating units of formula (1) being from more than 9 mol % to 100 mol % based on the total amount of all repeating units, —Ar 1 —(CR 1 ═CR 2 ) m — (1) wherein, Ar 1 represents an arylene group having 6 to 60 carbon atoms participating in the conjugation or a divalent heterocyclic compound group having 2 to 60 carbon atoms participating in the conjugation, each Ar 1 independently carrying at least one substituent, wherein, one, and only one, substituents is a substituent represented by the formula (2); m represents 0 or 1; R 1 and R 2 are independently selected from the group consisting of a hydrogen atom, a linear, branched or cyclic alkyl group having 2 to 20 carbon atoms, an aryl group having 6 to 60 carbon atoms, a heterocyclic compound groups having 2 to 60 carbon atoms and cyano group; —X—Ar 2 (2) wherein, X represents —O—, —S—, or —SiR 3 R 4 —; and R 3 , R 4 are independently selected from the group consisting of a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 60 carbon atoms, a heterocyclic compound groups having 2 to 60 carbon atoms and a cyano group; Ar 2 represents a heterocyclic compound group having 2 to 60 carbon atoms participating in the conjugation or an aryl group having 6 to 60 carbon atoms participating in the conjugation and having at least one substituent thereon; the substituents on the aryl group are selected from linear, branched or cyclic alkyl group having 5 to 20 carbon atoms, alkoxy groups carrying a linear, branched or cyclic alkyl group having 1 to 20 carbon atom, alkylthio groups carrying a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, mono-, di- or tri-alkylsilyl groups having 1 to 60 carbon atoms, mono- or di-alkylamino groups having 1 to 40 carbon atoms, aryl groups having 6 to 60 carbon atoms and having at least one substituent thereon, aryloxy groups having 6 to 60 carbon atoms, arylalkyl groups having 7 to 60 carbon atoms, and arylalkoxy groups having 7 to 60 carbon atoms; wherein the portion represented by —CH 3 in the substituents on the above Ar 2 may be replaced with —SiR 6 R 7 R 8 , and the portion represented by —CH 2 — may be replaced with —O—, —S—, or —SiR 9 R 10 —, the portion represented by may be replaced with the above R 6 , R 7 , R 8 , R 9 , R 10 , and R 11 each independently represent a group selected from a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heterocyclic compound group having 2 to 20 carbon atoms, and a cyano group; wherein one or more hydrogen atoms of the substituent on the above Ar 2 may be substituted with a fluorine atom; and when a plurality of the substituents are present on Ar 2 , they may be the same or different.