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A polymeric fluorescent substance exhibiting fluorescence in solid state and having a polystyrene-reduced number-average molecular weight of 103 to 108 wherein the polymeric fluorescent substance contains one or more of segments represented by the following formula (1) and one or more of repeating u

A polymeric fluorescent substance exhibiting fluorescence in solid state and having a polystyrene-reduced number-average molecular weight of 103 to 108 wherein the polymeric fluorescent substance contains one or more of segments represented by the following formula (1) and one or more of repeating units represented by the following formula (2): [EQU1]The polymeric fluorescent substance exhibits particularly strong fluorescence, and a high performance polymer LED which can be driven at low voltage and high efficiency is obtained.

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1. A polymeric fluorescent substance manifesting fluorescence in solid state and having a polystyrene-reduced number-average molecular weight of 103 to 108 wherein the polymeric fluorescent substance contains one or more of segments represented by the following formula (1) and one or more of repeati

1. A polymeric fluorescent substance manifesting fluorescence in solid state and having a polystyrene-reduced number-average molecular weight of 103 to 108 wherein the polymeric fluorescent substance contains one or more of segments represented by the following formula (1) and one or more of repeating units represented by the following formula (2): [EQU20]in the formula, Ar1 and Ar2 each independently represent an arylene group or a divalent heterocyclic compound group; R2 and R3 each independently represent a group selected from the group consisting of a hydrogen atom, alkyl groups, aryl groups, heterocyclic compound groups and cyano group; R1and R4 each independently represent a group selected from the group consisting of alkyl groups, alkoxy groups, alkylthio groups, alkylsilyl groups, alkylamino groups, aryl groups, aryloxy groups, arylsilyl groups, arylamino groups, arylalkyl groups, arylalkoxy groups, arylalkylsilyl groups, arylalkylamino groups, arylalkenyl groups, arylalkinyl groups, monovalent heterocyclic compound groups and cyano group; a and c each independently represent an integer of 0 to 4, and b represents an integer of 1 or more; when b is 1, a and c do not represent 0 simultaneously; when b is 2, at least one of groups R2 and R3 represents a group other than a hydrogen atom and cyano group; when b is 3 or more, a and c do not represent 0 simultaneously if both of R2 and R3 are a hydrogen atom; when a is 2 or more, a plurality of R1s may be the same or different; when c is 2 or more, a plurality of R4s may be the same or different; R1 to R4 may be connected to form a ring; and when R1 to R4 are a group containing an alkyl chain, one or more of a methyl group, methylene group and methine group constituting this alkyl chain may be substituted with a group containing a hetero atom, [EQU21]in the formula, R5 and R6 each independently represent a group selected from the group consisting of a hydrogen atom, alkyl groups, aryl groups and monovalent heterocyclic compound groups; R7 and R8 each independently represent a group selected from the group consisting of alkyl groups, alkoxy groups, alkylthio groups, alkylsilyl groups, alkylamino groups, aryl groups, aryloxy groups, arylsilyl groups, arylamino groups, arylalkyl groups, arylalkoxy groups, arylalkylsilyl groups, arylalkylamino groups, monovalent heterocyclic compound groups and cyano group; k and l each independently represent an integer of 0 to 3; when k is 2 or more, a plurality of R7s may be the same or different; when l is 2 or more, a plurality of R8s may be the same or different; two or more of R5 to R8 may be mutually connected to form a ring; and when R5 to R8 are a group containing an alkyl chain, this alkyl chain may be interrupted with a group containing a hetero atom.